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-rw-r--r--Documentation/ABI/testing/sysfs-kernel-mm-cma25
-rw-r--r--Documentation/admin-guide/kernel-parameters.txt17
-rw-r--r--Documentation/admin-guide/mm/memory-hotplug.rst9
-rw-r--r--Documentation/admin-guide/mm/userfaultfd.rst107
-rw-r--r--arch/arc/Kconfig9
-rw-r--r--arch/arm/Kconfig10
-rw-r--r--arch/arm64/Kconfig30
-rw-r--r--arch/arm64/mm/hugetlbpage.c7
-rw-r--r--arch/ia64/Kconfig14
-rw-r--r--arch/ia64/mm/hugetlbpage.c3
-rw-r--r--arch/mips/Kconfig6
-rw-r--r--arch/mips/mm/hugetlbpage.c4
-rw-r--r--arch/parisc/Kconfig5
-rw-r--r--arch/parisc/mm/hugetlbpage.c2
-rw-r--r--arch/powerpc/Kconfig17
-rw-r--r--arch/powerpc/mm/hugetlbpage.c3
-rw-r--r--arch/powerpc/platforms/Kconfig.cputype16
-rw-r--r--arch/riscv/Kconfig5
-rw-r--r--arch/s390/Kconfig12
-rw-r--r--arch/s390/mm/hugetlbpage.c2
-rw-r--r--arch/sh/Kconfig7
-rw-r--r--arch/sh/mm/Kconfig8
-rw-r--r--arch/sh/mm/hugetlbpage.c2
-rw-r--r--arch/sparc/mm/hugetlbpage.c2
-rw-r--r--arch/x86/Kconfig29
-rw-r--r--arch/x86/mm/pat/set_memory.c8
-rw-r--r--drivers/acpi/acpi_memhotplug.c5
-rw-r--r--drivers/base/memory.c101
-rw-r--r--fs/Kconfig5
-rw-r--r--fs/block_dev.c2
-rw-r--r--fs/btrfs/compression.c5
-rw-r--r--fs/btrfs/extent_io.c22
-rw-r--r--fs/btrfs/inode.c33
-rw-r--r--fs/btrfs/reflink.c6
-rw-r--r--fs/btrfs/zlib.c5
-rw-r--r--fs/btrfs/zstd.c5
-rw-r--r--fs/buffer.c36
-rw-r--r--fs/dax.c8
-rw-r--r--fs/gfs2/glock.c3
-rw-r--r--fs/hugetlbfs/inode.c9
-rw-r--r--fs/inode.c9
-rw-r--r--fs/proc/task_mmu.c3
-rw-r--r--fs/userfaultfd.c149
-rw-r--r--include/linux/buffer_head.h4
-rw-r--r--include/linux/cma.h4
-rw-r--r--include/linux/compaction.h1
-rw-r--r--include/linux/fs.h2
-rw-r--r--include/linux/gfp.h2
-rw-r--r--include/linux/highmem.h7
-rw-r--r--include/linux/huge_mm.h3
-rw-r--r--include/linux/hugetlb.h33
-rw-r--r--include/linux/memcontrol.h23
-rw-r--r--include/linux/memory.h8
-rw-r--r--include/linux/memory_hotplug.h15
-rw-r--r--include/linux/memremap.h2
-rw-r--r--include/linux/migrate.h7
-rw-r--r--include/linux/mm.h26
-rw-r--r--include/linux/mmzone.h20
-rw-r--r--include/linux/pagemap.h5
-rw-r--r--include/linux/pgtable.h12
-rw-r--r--include/linux/sched.h2
-rw-r--r--include/linux/sched/mm.h27
-rw-r--r--include/linux/shrinker.h7
-rw-r--r--include/linux/swap.h21
-rw-r--r--include/linux/userfaultfd_k.h49
-rw-r--r--include/linux/vm_event_item.h8
-rw-r--r--include/trace/events/cma.h68
-rw-r--r--include/trace/events/migrate.h25
-rw-r--r--include/trace/events/mmflags.h7
-rw-r--r--include/uapi/linux/mempolicy.h7
-rw-r--r--include/uapi/linux/userfaultfd.h36
-rw-r--r--init/Kconfig5
-rw-r--r--kernel/sysctl.c2
-rw-r--r--lib/Kconfig.kfence1
-rw-r--r--lib/iov_iter.c8
-rw-r--r--mm/Kconfig28
-rw-r--r--mm/Makefile6
-rw-r--r--mm/cma.c62
-rw-r--r--mm/cma.h25
-rw-r--r--mm/cma_debug.c8
-rw-r--r--mm/cma_sysfs.c112
-rw-r--r--mm/compaction.c107
-rw-r--r--mm/filemap.c24
-rw-r--r--mm/frontswap.c12
-rw-r--r--mm/gup.c174
-rw-r--r--mm/gup_test.c29
-rw-r--r--mm/gup_test.h3
-rw-r--r--mm/highmem.c11
-rw-r--r--mm/huge_memory.c324
-rw-r--r--mm/hugetlb.c777
-rw-r--r--mm/hugetlb_cgroup.c9
-rw-r--r--mm/internal.h10
-rw-r--r--mm/kfence/core.c59
-rw-r--r--mm/khugepaged.c63
-rw-r--r--mm/ksm.c17
-rw-r--r--mm/list_lru.c6
-rw-r--r--mm/memcontrol.c131
-rw-r--r--mm/memory_hotplug.c216
-rw-r--r--mm/mempolicy.c12
-rw-r--r--mm/mempool.c2
-rw-r--r--mm/migrate.c89
-rw-r--r--mm/mlock.c4
-rw-r--r--mm/mmap.c18
-rw-r--r--mm/oom_kill.c2
-rw-r--r--mm/page_alloc.c75
-rw-r--r--mm/process_vm_access.c1
-rw-r--r--mm/shmem.c2
-rw-r--r--mm/sparse.c4
-rw-r--r--mm/swap.c69
-rw-r--r--mm/swap_state.c4
-rw-r--r--mm/swapfile.c4
-rw-r--r--mm/truncate.c19
-rw-r--r--mm/userfaultfd.c39
-rw-r--r--mm/util.c26
-rw-r--r--mm/vmalloc.c2
-rw-r--r--mm/vmscan.c411
-rw-r--r--mm/vmstat.c35
-rw-r--r--mm/workingset.c1
-rw-r--r--mm/zsmalloc.c6
-rw-r--r--mm/zswap.c2
-rw-r--r--tools/testing/selftests/vm/.gitignore1
-rw-r--r--tools/testing/selftests/vm/Makefile1
-rw-r--r--tools/testing/selftests/vm/gup_test.c36
-rw-r--r--tools/testing/selftests/vm/split_huge_page_test.c390
-rw-r--r--tools/testing/selftests/vm/userfaultfd.c164
125 files changed, 3386 insertions, 1458 deletions
diff --git a/Documentation/ABI/testing/sysfs-kernel-mm-cma b/Documentation/ABI/testing/sysfs-kernel-mm-cma
new file mode 100644
index 000000000000..02b2bb60c296
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-kernel-mm-cma
@@ -0,0 +1,25 @@
+What: /sys/kernel/mm/cma/
+Date: Feb 2021
+Contact: Minchan Kim <minchan@kernel.org>
+Description:
+ /sys/kernel/mm/cma/ contains a subdirectory for each CMA
+ heap name (also sometimes called CMA areas).
+
+ Each CMA heap subdirectory (that is, each
+ /sys/kernel/mm/cma/<cma-heap-name> directory) contains the
+ following items:
+
+ alloc_pages_success
+ alloc_pages_fail
+
+What: /sys/kernel/mm/cma/<cma-heap-name>/alloc_pages_success
+Date: Feb 2021
+Contact: Minchan Kim <minchan@kernel.org>
+Description:
+ the number of pages CMA API succeeded to allocate
+
+What: /sys/kernel/mm/cma/<cma-heap-name>/alloc_pages_fail
+Date: Feb 2021
+Contact: Minchan Kim <minchan@kernel.org>
+Description:
+ the number of pages CMA API failed to allocate
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 0d48fbd9107f..a1266f33d6e6 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2804,6 +2804,23 @@
seconds. Use this parameter to check at some
other rate. 0 disables periodic checking.
+ memory_hotplug.memmap_on_memory
+ [KNL,X86,ARM] Boolean flag to enable this feature.
+ Format: {on | off (default)}
+ When enabled, runtime hotplugged memory will
+ allocate its internal metadata (struct pages)
+ from the hotadded memory which will allow to
+ hotadd a lot of memory without requiring
+ additional memory to do so.
+ This feature is disabled by default because it
+ has some implication on large (e.g. GB)
+ allocations in some configurations (e.g. small
+ memory blocks).
+ The state of the flag can be read in
+ /sys/module/memory_hotplug/parameters/memmap_on_memory.
+ Note that even when enabled, there are a few cases where
+ the feature is not effective.
+
memtest= [KNL,X86,ARM,PPC] Enable memtest
Format: <integer>
default : 0 <disable>
diff --git a/Documentation/admin-guide/mm/memory-hotplug.rst b/Documentation/admin-guide/mm/memory-hotplug.rst
index 5307f90738aa..05d51d2d8beb 100644
--- a/Documentation/admin-guide/mm/memory-hotplug.rst
+++ b/Documentation/admin-guide/mm/memory-hotplug.rst
@@ -357,6 +357,15 @@ creates ZONE_MOVABLE as following.
Unfortunately, there is no information to show which memory block belongs
to ZONE_MOVABLE. This is TBD.
+.. note::
+ Techniques that rely on long-term pinnings of memory (especially, RDMA and
+ vfio) are fundamentally problematic with ZONE_MOVABLE and, therefore, memory
+ hot remove. Pinned pages cannot reside on ZONE_MOVABLE, to guarantee that
+ memory can still get hot removed - be aware that pinning can fail even if
+ there is plenty of free memory in ZONE_MOVABLE. In addition, using
+ ZONE_MOVABLE might make page pinning more expensive, because pages have to be
+ migrated off that zone first.
+
.. _memory_hotplug_how_to_offline_memory:
How to offline memory
diff --git a/Documentation/admin-guide/mm/userfaultfd.rst b/Documentation/admin-guide/mm/userfaultfd.rst
index 65eefa66c0ba..3aa38e8b8361 100644
--- a/Documentation/admin-guide/mm/userfaultfd.rst
+++ b/Documentation/admin-guide/mm/userfaultfd.rst
@@ -63,36 +63,36 @@ the generic ioctl available.
The ``uffdio_api.features`` bitmask returned by the ``UFFDIO_API`` ioctl
defines what memory types are supported by the ``userfaultfd`` and what
-events, except page fault notifications, may be generated.
-
-If the kernel supports registering ``userfaultfd`` ranges on hugetlbfs
-virtual memory areas, ``UFFD_FEATURE_MISSING_HUGETLBFS`` will be set in
-``uffdio_api.features``. Similarly, ``UFFD_FEATURE_MISSING_SHMEM`` will be
-set if the kernel supports registering ``userfaultfd`` ranges on shared
-memory (covering all shmem APIs, i.e. tmpfs, ``IPCSHM``, ``/dev/zero``,
-``MAP_SHARED``, ``memfd_create``, etc).
-
-The userland application that wants to use ``userfaultfd`` with hugetlbfs
-or shared memory need to set the corresponding flag in
-``uffdio_api.features`` to enable those features.
-
-If the userland desires to receive notifications for events other than
-page faults, it has to verify that ``uffdio_api.features`` has appropriate
-``UFFD_FEATURE_EVENT_*`` bits set. These events are described in more
-detail below in `Non-cooperative userfaultfd`_ section.
-
-Once the ``userfaultfd`` has been enabled the ``UFFDIO_REGISTER`` ioctl should
-be invoked (if present in the returned ``uffdio_api.ioctls`` bitmask) to
-register a memory range in the ``userfaultfd`` by setting the
+events, except page fault notifications, may be generated:
+
+- The ``UFFD_FEATURE_EVENT_*`` flags indicate that various other events
+ other than page faults are supported. These events are described in more
+ detail below in the `Non-cooperative userfaultfd`_ section.
+
+- ``UFFD_FEATURE_MISSING_HUGETLBFS`` and ``UFFD_FEATURE_MISSING_SHMEM``
+ indicate that the kernel supports ``UFFDIO_REGISTER_MODE_MISSING``
+ registrations for hugetlbfs and shared memory (covering all shmem APIs,
+ i.e. tmpfs, ``IPCSHM``, ``/dev/zero``, ``MAP_SHARED``, ``memfd_create``,
+ etc) virtual memory areas, respectively.
+
+- ``UFFD_FEATURE_MINOR_HUGETLBFS`` indicates that the kernel supports
+ ``UFFDIO_REGISTER_MODE_MINOR`` registration for hugetlbfs virtual memory
+ areas.
+
+The userland application should set the feature flags it intends to use
+when invoking the ``UFFDIO_API`` ioctl, to request that those features be
+enabled if supported.
+
+Once the ``userfaultfd`` API has been enabled the ``UFFDIO_REGISTER``
+ioctl should be invoked (if present in the returned ``uffdio_api.ioctls``
+bitmask) to register a memory range in the ``userfaultfd`` by setting the
uffdio_register structure accordingly. The ``uffdio_register.mode``
bitmask will specify to the kernel which kind of faults to track for
-the range (``UFFDIO_REGISTER_MODE_MISSING`` would track missing
-pages). The ``UFFDIO_REGISTER`` ioctl will return the
+the range. The ``UFFDIO_REGISTER`` ioctl will return the
``uffdio_register.ioctls`` bitmask of ioctls that are suitable to resolve
userfaults on the range registered. Not all ioctls will necessarily be
-supported for all memory types depending on the underlying virtual
-memory backend (anonymous memory vs tmpfs vs real filebacked
-mappings).
+supported for all memory types (e.g. anonymous memory vs. shmem vs.
+hugetlbfs), or all types of intercepted faults.
Userland can use the ``uffdio_register.ioctls`` to manage the virtual
address space in the background (to add or potentially also remove
@@ -100,21 +100,46 @@ memory from the ``userfaultfd`` registered range). This means a userfault
could be triggering just before userland maps in the background the
user-faulted page.
-The primary ioctl to resolve userfaults is ``UFFDIO_COPY``. That
-atomically copies a page into the userfault registered range and wakes
-up the blocked userfaults
-(unless ``uffdio_copy.mode & UFFDIO_COPY_MODE_DONTWAKE`` is set).
-Other ioctl works similarly to ``UFFDIO_COPY``. They're atomic as in
-guaranteeing that nothing can see an half copied page since it'll
-keep userfaulting until the copy has finished.
+Resolving Userfaults
+--------------------
+
+There are three basic ways to resolve userfaults:
+
+- ``UFFDIO_COPY`` atomically copies some existing page contents from
+ userspace.
+
+- ``UFFDIO_ZEROPAGE`` atomically zeros the new page.
+
+- ``UFFDIO_CONTINUE`` maps an existing, previously-populated page.
+
+These operations are atomic in the sense that they guarantee nothing can
+see a half-populated page, since readers will keep userfaulting until the
+operation has finished.
+
+By default, these wake up userfaults blocked on the range in question.
+They support a ``UFFDIO_*_MODE_DONTWAKE`` ``mode`` flag, which indicates
+that waking will be done separately at some later time.
+
+Which ioctl to choose depends on the kind of page fault, and what we'd
+like to do to resolve it:
+
+- For ``UFFDIO_REGISTER_MODE_MISSING`` faults, the fault needs to be
+ resolved by either providing a new page (``UFFDIO_COPY``), or mapping
+ the zero page (``UFFDIO_ZEROPAGE``). By default, the kernel would map
+ the zero page for a missing fault. With userfaultfd, userspace can
+ decide what content to provide before the faulting thread continues.
+
+- For ``UFFDIO_REGISTER_MODE_MINOR`` faults, there is an existing page (in
+ the page cache). Userspace has the option of modifying the page's
+ contents before resolving the fault. Once the contents are correct
+ (modified or not), userspace asks the kernel to map the page and let the
+ faulting thread continue with ``UFFDIO_CONTINUE``.
Notes:
-- If you requested ``UFFDIO_REGISTER_MODE_MISSING`` when registering then
- you must provide some kind of page in your thread after reading from
- the uffd. You must provide either ``UFFDIO_COPY`` or ``UFFDIO_ZEROPAGE``.
- The normal behavior of the OS automatically providing a zero page on
- an anonymous mmaping is not in place.
+- You can tell which kind of fault occurred by examining
+ ``pagefault.flags`` within the ``uffd_msg``, checking for the
+ ``UFFD_PAGEFAULT_FLAG_*`` flags.
- None of the page-delivering ioctls default to the range that you
registered with. You must fill in all fields for the appropriate
@@ -122,9 +147,9 @@ Notes:
- You get the address of the access that triggered the missing page
event out of a struct uffd_msg that you read in the thread from the
- uffd. You can supply as many pages as you want with ``UFFDIO_COPY`` or
- ``UFFDIO_ZEROPAGE``. Keep in mind that unless you used DONTWAKE then
- the first of any of those IOCTLs wakes up the faulting thread.
+ uffd. You can supply as many pages as you want with these IOCTLs.
+ Keep in mind that unless you used DONTWAKE then the first of any of
+ those IOCTLs wakes up the faulting thread.
- Be sure to test for all errors including
(``pollfd[0].revents & POLLERR``). This can happen, e.g. when ranges
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index bc8d6aecfbbd..2d98501c0897 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -6,6 +6,7 @@
config ARC
def_bool y
select ARC_TIMERS
+ select ARCH_HAS_CACHE_LINE_SIZE
select ARCH_HAS_DEBUG_VM_PGTABLE
select ARCH_HAS_DMA_PREP_COHERENT
select ARCH_HAS_PTE_SPECIAL
@@ -28,6 +29,7 @@ config ARC
select GENERIC_SMP_IDLE_THREAD
select HAVE_ARCH_KGDB
select HAVE_ARCH_TRACEHOOK
+ select HAVE_ARCH_TRANSPARENT_HUGEPAGE if ARC_MMU_V4
select HAVE_DEBUG_STACKOVERFLOW
select HAVE_DEBUG_KMEMLEAK
select HAVE_FUTEX_CMPXCHG if FUTEX
@@ -48,9 +50,6 @@ config ARC
select HAVE_ARCH_JUMP_LABEL if ISA_ARCV2 && !CPU_ENDIAN_BE32
select SET_FS
-config ARCH_HAS_CACHE_LINE_SIZE
- def_bool y
-
config TRACE_IRQFLAGS_SUPPORT
def_bool y
@@ -86,10 +85,6 @@ config STACKTRACE_SUPPORT
def_bool y
select STACKTRACE
-config HAVE_ARCH_TRANSPARENT_HUGEPAGE
- def_bool y
- depends on ARC_MMU_V4
-
menu "ARC Architecture Configuration"
menu "ARC Platform/SoC/Board"
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 085c830d344b..24804f11302d 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -31,6 +31,7 @@ config ARM
select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT if CPU_V7
select ARCH_SUPPORTS_ATOMIC_RMW
+ select ARCH_SUPPORTS_HUGETLBFS if ARM_LPAE
select ARCH_USE_BUILTIN_BSWAP
select ARCH_USE_CMPXCHG_LOCKREF
select ARCH_USE_MEMTEST
@@ -77,6 +78,7 @@ config ARM
select HAVE_ARCH_SECCOMP_FILTER if AEABI && !OABI_COMPAT
select HAVE_ARCH_THREAD_STRUCT_WHITELIST
select HAVE_ARCH_TRACEHOOK
+ select HAVE_ARCH_TRANSPARENT_HUGEPAGE if ARM_LPAE
select HAVE_ARM_SMCCC if CPU_V7
select HAVE_EBPF_JIT if !CPU_ENDIAN_BE32
select HAVE_CONTEXT_TRACKING
@@ -1511,14 +1513,6 @@ config HW_PERF_EVENTS
def_bool y
depends on ARM_PMU
-config SYS_SUPPORTS_HUGETLBFS
- def_bool y
- depends on ARM_LPAE
-
-config HAVE_ARCH_TRANSPARENT_HUGEPAGE
- def_bool y
- depends on ARM_LPAE
-
config ARCH_WANT_GENERAL_HUGETLB
def_bool y
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 7f2a80091337..f0b17d758912 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -11,6 +11,12 @@ config ARM64
select ACPI_PPTT if ACPI
select ARCH_HAS_DEBUG_WX
select ARCH_BINFMT_ELF_STATE
+ select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION
+ select ARCH_ENABLE_MEMORY_HOTPLUG
+ select ARCH_ENABLE_MEMORY_HOTREMOVE
+ select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
+ select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
+ select ARCH_HAS_CACHE_LINE_SIZE
select ARCH_HAS_DEBUG_VIRTUAL
select ARCH_HAS_DEBUG_VM_PGTABLE
select ARCH_HAS_DMA_PREP_COHERENT
@@ -72,6 +78,7 @@ config ARM64
select ARCH_USE_QUEUED_SPINLOCKS
select ARCH_USE_SYM_ANNOTATIONS
select ARCH_SUPPORTS_DEBUG_PAGEALLOC
+ select ARCH_SUPPORTS_HUGETLBFS
select ARCH_SUPPORTS_MEMORY_FAILURE
select ARCH_SUPPORTS_SHADOW_CALL_STACK if CC_HAVE_SHADOW_CALL_STACK
select ARCH_SUPPORTS_LTO_CLANG if CPU_LITTLE_ENDIAN
@@ -213,6 +220,7 @@ config ARM64
select SWIOTLB
select SYSCTL_EXCEPTION_TRACE
select THREAD_INFO_IN_TASK
+ select HAVE_ARCH_USERFAULTFD_MINOR if USERFAULTFD
help
ARM 64-bit (AArch64) Linux support.
@@ -308,10 +316,7 @@ config ZONE_DMA32
bool "Support DMA32 zone" if EXPERT
default y
-config ARCH_ENABLE_MEMORY_HOTPLUG
- def_bool y
-
-config ARCH_ENABLE_MEMORY_HOTREMOVE
+config ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
def_bool y
config SMP
@@ -1070,18 +1075,9 @@ config HW_PERF_EVENTS
def_bool y
depends on ARM_PMU
-config SYS_SUPPORTS_HUGETLBFS
- def_bool y
-
-config ARCH_HAS_CACHE_LINE_SIZE
- def_bool y
-
config ARCH_HAS_FILTER_PGPROT
def_bool y
-config ARCH_ENABLE_SPLIT_PMD_PTLOCK
- def_bool y if PGTABLE_LEVELS > 2
-
# Supported by clang >= 7.0
config CC_HAVE_SHADOW_CALL_STACK
def_bool $(cc-option, -fsanitize=shadow-call-stack -ffixed-x18)
@@ -1923,14 +1919,6 @@ config SYSVIPC_COMPAT
def_bool y
depends on COMPAT && SYSVIPC
-config ARCH_ENABLE_HUGEPAGE_MIGRATION
- def_bool y
- depends on HUGETLB_PAGE && MIGRATION
-
-config ARCH_ENABLE_THP_MIGRATION
- def_bool y
- depends on TRANSPARENT_HUGEPAGE
-
menu "Power management options"
source "kernel/power/Kconfig"
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index 55ecf6de9ff7..58987a98e179 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -252,7 +252,7 @@ void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
set_pte(ptep, pte);
}
-pte_t *huge_pte_alloc(struct mm_struct *mm,
+pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long addr, unsigned long sz)
{
pgd_t *pgdp;
@@ -284,9 +284,8 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
*/
ptep = pte_alloc_map(mm, pmdp, addr);
} else if (sz == PMD_SIZE) {
- if (IS_ENABLED(CONFIG_ARCH_WANT_HUGE_PMD_SHARE) &&
- pud_none(READ_ONCE(*pudp)))
- ptep = huge_pmd_share(mm, addr, pudp);
+ if (want_pmd_share(vma, addr) && pud_none(READ_ONCE(*pudp)))
+ ptep = huge_pmd_share(mm, vma, addr, pudp);
else
ptep = (pte_t *)pmd_alloc(mm, pudp, addr);
} else if (sz == (CONT_PMD_SIZE)) {
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 81e2b893b1e7..279252e3e0f7 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -13,6 +13,8 @@ config IA64
select ARCH_MIGHT_HAVE_PC_SERIO
select ACPI
select ACPI_NUMA if NUMA
+ select ARCH_ENABLE_MEMORY_HOTPLUG
+ select ARCH_ENABLE_MEMORY_HOTREMOVE
select ARCH_SUPPORTS_ACPI
select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
@@ -32,6 +34,7 @@ config IA64
select TTY
select HAVE_ARCH_TRACEHOOK
select HAVE_VIRT_CPU_ACCOUNTING
+ select HUGETLB_PAGE_SIZE_VARIABLE if HUGETLB_PAGE
select VIRT_TO_BUS
select GENERIC_IRQ_PROBE
select GENERIC_PENDING_IRQ if SMP
@@ -82,11 +85,6 @@ config STACKTRACE_SUPPORT
config GENERIC_LOCKBREAK
def_bool n
-config HUGETLB_PAGE_SIZE_VARIABLE
- bool
- depends on HUGETLB_PAGE
- default y
-
config GENERIC_CALIBRATE_DELAY
bool
default y
@@ -250,12 +248,6 @@ config HOTPLUG_CPU
can be controlled through /sys/devices/system/cpu/cpu#.
Say N if you want to disable CPU hotplug.
-config ARCH_ENABLE_MEMORY_HOTPLUG
- def_bool y
-
-config ARCH_ENABLE_MEMORY_HOTREMOVE
- def_bool y
-
config SCHED_SMT
bool "SMT scheduler support"
depends on SMP
diff --git a/arch/ia64/mm/hugetlbpage.c b/arch/ia64/mm/hugetlbpage.c
index b331f94d20ac..f993cb36c062 100644
--- a/arch/ia64/mm/hugetlbpage.c
+++ b/arch/ia64/mm/hugetlbpage.c
@@ -25,7 +25,8 @@ unsigned int hpage_shift = HPAGE_SHIFT_DEFAULT;
EXPORT_SYMBOL(hpage_shift);
pte_t *
-huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz)
+huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
+ unsigned long addr, unsigned long sz)
{
unsigned long taddr = htlbpage_to_page(addr);
pgd_t *pgd;
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 49a3c9cd1cb2..ed51970c08e7 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -19,6 +19,7 @@ config MIPS
select ARCH_USE_MEMTEST
select ARCH_USE_QUEUED_RWLOCKS
select ARCH_USE_QUEUED_SPINLOCKS
+ select ARCH_SUPPORTS_HUGETLBFS if CPU_SUPPORTS_HUGEPAGES
select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
select ARCH_WANT_IPC_PARSE_VERSION
select ARCH_WANT_LD_ORPHAN_WARN
@@ -1287,11 +1288,6 @@ config SYS_SUPPORTS_BIG_ENDIAN
config SYS_SUPPORTS_LITTLE_ENDIAN
bool
-config SYS_SUPPORTS_HUGETLBFS
- bool
- depends on CPU_SUPPORTS_HUGEPAGES
- default y
-
config MIPS_HUGE_TLB_SUPPORT
def_bool HUGETLB_PAGE || TRANSPARENT_HUGEPAGE
diff --git a/arch/mips/mm/hugetlbpage.c b/arch/mips/mm/hugetlbpage.c
index b9f76f433617..7eaff5b07873 100644
--- a/arch/mips/mm/hugetlbpage.c
+++ b/arch/mips/mm/hugetlbpage.c
@@ -21,8 +21,8 @@
#include <asm/tlb.h>
#include <asm/tlbflush.h>
-pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr,
- unsigned long sz)
+pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
+ unsigned long addr, unsigned long sz)
{
pgd_t *pgd;
p4d_t *p4d;
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index afc3b8d03572..bde9907bc5b2 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -12,6 +12,7 @@ config PARISC
select ARCH_HAS_STRICT_KERNEL_RWX
select ARCH_HAS_UBSAN_SANITIZE_ALL
select ARCH_NO_SG_CHAIN
+ select ARCH_SUPPORTS_HUGETLBFS if PA20
select ARCH_SUPPORTS_MEMORY_FAILURE
select DMA_OPS
select RTC_CLASS
@@ -138,10 +139,6 @@ config PGTABLE_LEVELS
default 3 if 64BIT && PARISC_PAGE_SIZE_4KB
default 2
-config SYS_SUPPORTS_HUGETLBFS
- def_bool y if PA20
-
-
menu "Processor type and features"
choice
diff --git a/arch/parisc/mm/hugetlbpage.c b/arch/parisc/mm/hugetlbpage.c
index 43652de5f139..d1d3990b83f6 100644
--- a/arch/parisc/mm/hugetlbpage.c
+++ b/arch/parisc/mm/hugetlbpage.c
@@ -44,7 +44,7 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
}
-pte_t *huge_pte_alloc(struct mm_struct *mm,
+pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long addr, unsigned long sz)
{
pgd_t *pgd;
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 1e6230bea09d..cb2d44ee4e38 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -118,6 +118,8 @@ config PPC
# Please keep this list sorted alphabetically.
#
select ARCH_32BIT_OFF_T if PPC32
+ select ARCH_ENABLE_MEMORY_HOTPLUG
+ select ARCH_ENABLE_MEMORY_HOTREMOVE
select ARCH_HAS_DEBUG_VIRTUAL
select ARCH_HAS_DEBUG_VM_PGTABLE
select ARCH_HAS_DEVMEM_IS_ALLOWED
@@ -236,6 +238,7 @@ config PPC
select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH
select HAVE_PERF_REGS
select HAVE_PERF_USER_STACK_DUMP
+ select HUGETLB_PAGE_SIZE_VARIABLE if PPC_BOOK3S_64 && HUGETLB_PAGE
select MMU_GATHER_RCU_TABLE_FREE
select MMU_GATHER_PAGE_SIZE
select HAVE_REGS_AND_STACK_ACCESS_API
@@ -420,11 +423,6 @@ config HIGHMEM
source "kernel/Kconfig.hz"
-config HUGETLB_PAGE_SIZE_VARIABLE
- bool
- depends on HUGETLB_PAGE && PPC_BOOK3S_64
- default y
-
config MATH_EMULATION
bool "Math emulation"
depends on 4xx || PPC_8xx || PPC_MPC832x || BOOKE
@@ -520,12 +518,6 @@ config ARCH_CPU_PROBE_RELEASE
def_bool y
depends on HOTPLUG_CPU
-config ARCH_ENABLE_MEMORY_HOTPLUG
- def_bool y
-
-config ARCH_ENABLE_MEMORY_HOTREMOVE
- def_bool y
-
config PPC64_SUPPORTS_MEMORY_FAILURE
bool "Add support for memory hwpoison"
depends on PPC_BOOK3S_64
@@ -705,9 +697,6 @@ config ARCH_SPARSEMEM_DEFAULT
def_bool y
depends on PPC_BOOK3S_64
-config SYS_SUPPORTS_HUGETLBFS
- bool
-
config ILLEGAL_POINTER_VALUE
hex
# This is roughly half way between the top of user space and the bottom
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index d142b76d507d..9a75ba078e1b 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -106,7 +106,8 @@ static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp,
* At this point we do the placement change only for BOOK3S 64. This would
* possibly work on other subarchs.
*/
-pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz)
+pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
+ unsigned long addr, unsigned long sz)
{
pgd_t *pg;
p4d_t *p4;
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index e4b05667686e..f998e655b570 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -40,8 +40,8 @@ config PPC_85xx
config PPC_8xx
bool "Freescale 8xx"
+ select ARCH_SUPPORTS_HUGETLBFS
select FSL_SOC
- select SYS_SUPPORTS_HUGETLBFS
select PPC_HAVE_KUEP
select PPC_HAVE_KUAP
select HAVE_ARCH_VMAP_STACK
@@ -95,9 +95,11 @@ config PPC_BOOK3S_64
bool "Server processors"
select PPC_FPU
select PPC_HAVE_PMU_SUPPORT
- select SYS_SUPPORTS_HUGETLBFS
select HAVE_ARCH_TRANSPARENT_HUGEPAGE
+ select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION
+ select ARCH_ENABLE_PMD_SPLIT_PTLOCK
select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
+ select ARCH_SUPPORTS_HUGETLBFS
select ARCH_SUPPORTS_NUMA_BALANCING
select IRQ_WORK
select PPC_MM_SLICES
@@ -280,9 +282,9 @@ config FSL_BOOKE
# this is for common code between PPC32 & PPC64 FSL BOOKE
config PPC_FSL_BOOK3E
bool
+ select ARCH_SUPPORTS_HUGETLBFS if PHYS_64BIT || PPC64
select FSL_EMB_PERFMON
select PPC_SMP_MUXED_IPI
- select SYS_SUPPORTS_HUGETLBFS if PHYS_64BIT || PPC64
select PPC_DOORBELL
default y if FSL_BOOKE
@@ -358,10 +360,6 @@ config SPE
If in doubt, say Y here.
-config ARCH_ENABLE_SPLIT_PMD_PTLOCK
- def_bool y
- depends on PPC_BOOK3S_64
-
config PPC_RADIX_MMU
bool "Radix MMU Support"
depends on PPC_BOOK3S_64
@@ -421,10 +419,6 @@ config PPC_PKEY
depends on PPC_BOOK3S_64
depends on PPC_MEM_KEYS || PPC_KUAP || PPC_KUEP
-config ARCH_ENABLE_HUGEPAGE_MIGRATION
- def_bool y
- depends on PPC_BOOK3S_64 && HUGETLB_PAGE && MIGRATION
-
config PPC_MMU_NOHASH
def_bool y
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index add528eb9235..6860c0c21190 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -30,6 +30,7 @@ config RISCV
select ARCH_HAS_STRICT_KERNEL_RWX if MMU
select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
+ select ARCH_SUPPORTS_HUGETLBFS if MMU
select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
select ARCH_WANT_FRAME_POINTERS
select ARCH_WANT_HUGE_PMD_SHARE if 64BIT
@@ -166,10 +167,6 @@ config ARCH_WANT_GENERAL_HUGETLB
config ARCH_SUPPORTS_UPROBES
def_bool y
-config SYS_SUPPORTS_HUGETLBFS
- depends on MMU
- def_bool y
-
config STACKTRACE_SUPPORT
def_bool y
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index c1ff874e6c2e..d72989591223 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -60,6 +60,9 @@ config S390
imply IMA_SECURE_AND_OR_TRUSTED_BOOT
select ARCH_32BIT_USTAT_F_TINODE
select ARCH_BINFMT_ELF_STATE
+ select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM
+ select ARCH_ENABLE_MEMORY_HOTREMOVE
+ select ARCH_ENABLE_SPLIT_PMD_PTLOCK
select ARCH_HAS_DEBUG_VM_PGTABLE
select ARCH_HAS_DEBUG_WX
select ARCH_HAS_DEVMEM_IS_ALLOWED
@@ -626,15 +629,6 @@ config ARCH_SPARSEMEM_ENABLE
config ARCH_SPARSEMEM_DEFAULT
def_bool y
-config ARCH_ENABLE_MEMORY_HOTPLUG
- def_bool y if SPARSEMEM
-
-config ARCH_ENABLE_MEMORY_HOTREMOVE
- def_bool y
-
-config ARCH_ENABLE_SPLIT_PMD_PTLOCK
- def_bool y
-
config MAX_PHYSMEM_BITS
int "Maximum size of supported physical memory in bits (42-53)"
range 42 53
diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c
index 3b5a4d25ca9b..da36d13ffc16 100644
--- a/arch/s390/mm/hugetlbpage.c
+++ b/arch/s390/mm/hugetlbpage.c
@@ -189,7 +189,7 @@ pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
return pte;
}
-pte_t *huge_pte_alloc(struct mm_struct *mm,
+pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long addr, unsigned long sz)
{
pgd_t *pgdp;
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index e798e55915c2..68129537e350 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -2,6 +2,8 @@
config SUPERH
def_bool y
select ARCH_32BIT_OFF_T
+ select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM && MMU
+ select ARCH_ENABLE_MEMORY_HOTREMOVE if SPARSEMEM && MMU
select ARCH_HAVE_CUSTOM_GPIO_H
select ARCH_HAVE_NMI_SAFE_CMPXCHG if (GUSA_RB || CPU_SH4A)
select ARCH_HAS_BINFMT_FLAT if !MMU
@@ -101,9 +103,6 @@ config SYS_SUPPORTS_APM_EMULATION
bool
select ARCH_SUSPEND_POSSIBLE
-config SYS_SUPPORTS_HUGETLBFS
- bool
-
config SYS_SUPPORTS_SMP
bool
@@ -175,12 +174,12 @@ config CPU_SH3
config CPU_SH4
bool
+ select ARCH_SUPPORTS_HUGETLBFS if MMU
select CPU_HAS_INTEVT
select CPU_HAS_SR_RB
select CPU_HAS_FPU if !CPU_SH4AL_DSP
select SH_INTC
select SYS_SUPPORTS_SH_TMU
- select SYS_SUPPORTS_HUGETLBFS if MMU
config CPU_SH4A
bool
diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index 77aa2f802d8d..d551a9cac41e 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -136,14 +136,6 @@ config ARCH_SPARSEMEM_DEFAULT
config ARCH_SELECT_MEMORY_MODEL
def_bool y
-config ARCH_ENABLE_MEMORY_HOTPLUG
- def_bool y
- depends on SPARSEMEM && MMU
-
-config ARCH_ENABLE_MEMORY_HOTREMOVE
- def_bool y
- depends on SPARSEMEM && MMU
-
config ARCH_MEMORY_PROBE
def_bool y
depends on MEMORY_HOTPLUG
diff --git a/arch/sh/mm/hugetlbpage.c b/arch/sh/mm/hugetlbpage.c
index 220d7bc43d2b..999ab5916e69 100644
--- a/arch/sh/mm/hugetlbpage.c
+++ b/arch/sh/mm/hugetlbpage.c
@@ -21,7 +21,7 @@
#include <asm/tlbflush.h>
#include <asm/cacheflush.h>
-pte_t *huge_pte_alloc(struct mm_struct *mm,
+pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long addr, unsigned long sz)
{
pgd_t *pgd;
diff --git a/arch/sparc/mm/hugetlbpage.c b/arch/sparc/mm/hugetlbpage.c
index ad4b42f04988..04d8790f6c32 100644
--- a/arch/sparc/mm/hugetlbpage.c
+++ b/arch/sparc/mm/hugetlbpage.c
@@ -279,7 +279,7 @@ unsigned long pud_leaf_size(pud_t pud) { return 1UL << tte_to_shift(*(pte_t *)&p
unsigned long pmd_leaf_size(pmd_t pmd) { return 1UL << tte_to_shift(*(pte_t *)&pmd); }
unsigned long pte_leaf_size(pte_t pte) { return 1UL << tte_to_shift(pte); }
-pte_t *huge_pte_alloc(struct mm_struct *mm,
+pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long addr, unsigned long sz)
{
pgd_t *pgd;
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index dac15f646f79..0045e1b44190 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -60,7 +60,13 @@ config X86
select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
select ARCH_32BIT_OFF_T if X86_32
select ARCH_CLOCKSOURCE_INIT
+ select ARCH_ENABLE_HUGEPAGE_MIGRATION if X86_64 && HUGETLB_PAGE && MIGRATION
+ select ARCH_ENABLE_MEMORY_HOTPLUG if X86_64 || (X86_32 && HIGHMEM)
+ select ARCH_ENABLE_MEMORY_HOTREMOVE if MEMORY_HOTPLUG
+ select ARCH_ENABLE_SPLIT_PMD_PTLOCK if X86_64 || X86_PAE
+ select ARCH_ENABLE_THP_MIGRATION if X86_64 && TRANSPARENT_HUGEPAGE
select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
+ select ARCH_HAS_CACHE_LINE_SIZE
select ARCH_HAS_DEBUG_VIRTUAL
select ARCH_HAS_DEBUG_VM_PGTABLE if !X86_PAE
select ARCH_HAS_DEVMEM_IS_ALLOWED
@@ -165,6 +171,7 @@ config X86
select HAVE_ARCH_TRANSPARENT_HUGEPAGE
select HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD if X86_64
select HAVE_ARCH_USERFAULTFD_WP if X86_64 && USERFAULTFD
+ select HAVE_ARCH_USERFAULTFD_MINOR if X86_64 && USERFAULTFD
select HAVE_ARCH_VMAP_STACK if X86_64
select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
select HAVE_ARCH_WITHIN_STACK_FRAMES
@@ -315,9 +322,6 @@ config GENERIC_CALIBRATE_DELAY
config ARCH_HAS_CPU_RELAX
def_bool y
-config ARCH_HAS_CACHE_LINE_SIZE
- def_bool y
-
config ARCH_HAS_FILTER_PGPROT
def_bool y
@@ -2428,30 +2432,13 @@ config ARCH_HAS_ADD_PAGES
def_bool y
depends on X86_64 && ARCH_ENABLE_MEMORY_HOTPLUG
-config ARCH_ENABLE_MEMORY_HOTPLUG
- def_bool y
- depends on X86_64 || (X86_32 && HIGHMEM)
-
-config ARCH_ENABLE_MEMORY_HOTREMOVE
+config ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
def_bool y
- depends on MEMORY_HOTPLUG
config USE_PERCPU_NUMA_NODE_ID
def_bool y
depends on NUMA
-config ARCH_ENABLE_SPLIT_PMD_PTLOCK
- def_bool y
- depends on X86_64 || X86_PAE
-
-config ARCH_ENABLE_HUGEPAGE_MIGRATION
- def_bool y
- depends on X86_64 && HUGETLB_PAGE && MIGRATION
-
-config ARCH_ENABLE_THP_MIGRATION
- def_bool y
- depends on X86_64 && TRANSPARENT_HUGEPAGE
-
menu "Power management and ACPI options"
config ARCH_HIBERNATION_HEADER
diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c
index 427980617557..156cd235659f 100644
--- a/arch/x86/mm/pat/set_memory.c
+++ b/arch/x86/mm/pat/set_memory.c
@@ -16,6 +16,8 @@
#include <linux/pci.h>
#include <linux/vmalloc.h>
#include <linux/libnvdimm.h>
+#include <linux/vmstat.h>
+#include <linux/kernel.h>
#include <asm/e820/api.h>
#include <asm/processor.h>
@@ -91,6 +93,12 @@ static void split_page_count(int level)
return;
direct_pages_count[level]--;
+ if (system_state == SYSTEM_RUNNING) {
+ if (level == PG_LEVEL_2M)
+ count_vm_event(DIRECT_MAP_LEVEL2_SPLIT);
+ else if (level == PG_LEVEL_1G)
+ count_vm_event(DIRECT_MAP_LEVEL3_SPLIT);
+ }
direct_pages_count[level - 1] += PTRS_PER_PTE;
}
diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index b02fd51e5589..8cc195c4c861 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -171,6 +171,7 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
acpi_handle handle = mem_device->device->handle;
int result, num_enabled = 0;
struct acpi_memory_info *info;
+ mhp_t mhp_flags = MHP_NONE;
int node;
node = acpi_get_node(handle);
@@ -194,8 +195,10 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
if (node < 0)
node = memory_add_physaddr_to_nid(info->start_addr);
+ if (mhp_supports_memmap_on_memory(info->length))
+ mhp_flags |= MHP_MEMMAP_ON_MEMORY;
result = __add_memory(node, info->start_addr, info->length,
- MHP_NONE);
+ mhp_flags);
/*
* If the memory block has been used by the kernel, add_memory()
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index f35298425575..b31b3af5c490 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -169,30 +169,98 @@ int memory_notify(unsigned long val, void *v)
return blocking_notifier_call_chain(&memory_chain, val, v);
}
+static int memory_block_online(struct memory_block *mem)
+{
+ unsigned long start_pfn = section_nr_to_pfn(mem->start_section_nr);
+ unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
+ unsigned long nr_vmemmap_pages = mem->nr_vmemmap_pages;
+ struct zone *zone;
+ int ret;
+
+ zone = zone_for_pfn_range(mem->online_type, mem->nid, start_pfn, nr_pages);
+
+ /*
+ * Although vmemmap pages have a different lifecycle than the pages
+ * they describe (they remain until the memory is unplugged), doing
+ * their initialization and accounting at memory onlining/offlining
+ * stage helps to keep accounting easier to follow - e.g vmemmaps
+ * belong to the same zone as the memory they backed.
+ */
+ if (nr_vmemmap_pages) {
+ ret = mhp_init_memmap_on_memory(start_pfn, nr_vmemmap_pages, zone);
+ if (ret)
+ return ret;
+ }
+
+ ret = online_pages(start_pfn + nr_vmemmap_pages,
+ nr_pages - nr_vmemmap_pages, zone);
+ if (ret) {
+ if (nr_vmemmap_pages)
+ mhp_deinit_memmap_on_memory(start_pfn, nr_vmemmap_pages);
+ return ret;
+ }
+
+ /*
+ * Account once onlining succeeded. If the zone was unpopulated, it is
+ * now already properly populated.
+ */
+ if (nr_vmemmap_pages)
+ adjust_present_page_count(zone, nr_vmemmap_pages);
+
+ return ret;
+}
+
+static int memory_block_offline(struct memory_block *mem)
+{
+ unsigned long start_pfn = section_nr_to_pfn(mem->start_section_nr);
+ unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
+ unsigned long nr_vmemmap_pages = mem->nr_vmemmap_pages;
+ struct zone *zone;
+ int ret;
+
+ zone = page_zone(pfn_to_page(start_pfn));
+
+ /*
+ * Unaccount before offlining, such that unpopulated zone and kthreads
+ * can properly be torn down in offline_pages().
+ */
+ if (nr_vmemmap_pages)
+ adjust_present_page_count(zone, -nr_vmemmap_pages);
+
+ ret = offline_pages(start_pfn + nr_vmemmap_pages,
+ nr_pages - nr_vmemmap_pages);
+ if (ret) {
+ /* offline_pages() failed. Account back. */
+ if (nr_vmemmap_pages)
+ adjust_present_page_count(zone, nr_vmemmap_pages);
+ return ret;
+ }
+
+ if (nr_vmemmap_pages)
+ mhp_deinit_memmap_on_memory(start_pfn, nr_vmemmap_pages);
+
+ return ret;
+}
+
/*
* MEMORY_HOTPLUG depends on SPARSEMEM in mm/Kconfig, so it is
* OK to have direct references to sparsemem variables in here.
*/
static int
-memory_block_action(unsigned long start_section_nr, unsigned long action,
- int online_type, int nid)
+memory_block_action(struct memory_block *mem, unsigned long action)
{
- unsigned long start_pfn;
- unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
int ret;
- start_pfn = section_nr_to_pfn(start_section_nr);
-
switch (action) {
case MEM_ONLINE:
- ret = online_pages(start_pfn, nr_pages, online_type, nid);
+ ret = memory_block_online(mem);
break;
case MEM_OFFLINE:
- ret = offline_pages(start_pfn, nr_pages);
+ ret = memory_block_offline(mem);
break;
default:
WARN(1, KERN_WARNING "%s(%ld, %ld) unknown action: "
- "%ld\n", __func__, start_section_nr, action, action);
+ "%ld\n", __func__, mem->start_section_nr, action, action);
ret = -EINVAL;
}
@@ -210,9 +278,7 @@ static int memory_block_change_state(struct memory_block *mem,
if (to_state == MEM_OFFLINE)
mem->state = MEM_GOING_OFFLINE;
- ret = memory_block_action(mem->start_section_nr, to_state,
- mem->online_type, mem->nid);
-
+ ret = memory_block_action(mem, to_state);
mem->state = ret ? from_state_req : to_state;
return ret;
@@ -567,7 +633,8 @@ int register_memory(struct memory_block *memory)
return ret;
}
-static int init_memory_block(unsigned long block_id, unsigned long state)
+static int init_memory_block(unsigned long block_id, unsigned long state,
+ unsigned long nr_vmemmap_pages)
{
struct memory_block *mem;
int ret = 0;
@@ -584,6 +651,7 @@ static int init_memory_block(unsigned long block_id, unsigned long state)
mem->start_section_nr = block_id * sections_per_block;
mem->state = state;
mem->nid = NUMA_NO_NODE;
+ mem->nr_vmemmap_pages = nr_vmemmap_pages;
ret = register_memory(mem);
@@ -603,7 +671,7 @@ static int add_memory_block(unsigned long base_section_nr)
if (section_count == 0)
return 0;
return init_memory_block(memory_block_id(base_section_nr),
- MEM_ONLINE);
+ MEM_ONLINE, 0);
}
static void unregister_memory(struct memory_block *memory)
@@ -625,7 +693,8 @@ static void unregister_memory(struct memory_block *memory)
*
* Called under device_hotplug_lock.
*/
-int create_memory_block_devices(unsigned long start, unsigned long size)
+int create_memory_block_devices(unsigned long start, unsigned long size,
+ unsigned long vmemmap_pages)
{
const unsigned long start_block_id = pfn_to_block_id(PFN_DOWN(start));
unsigned long end_block_id = pfn_to_block_id(PFN_DOWN(start + size));
@@ -638,7 +707,7 @@ int create_memory_block_devices(unsigned long start, unsigned long size)
return -EINVAL;
for (block_id = start_block_id; block_id != end_block_id; block_id++) {
- ret = init_memory_block(block_id, MEM_OFFLINE);
+ ret = init_memory_block(block_id, MEM_OFFLINE, vmemmap_pages);
if (ret)
break;
}
diff --git a/fs/Kconfig b/fs/Kconfig
index 97e7b77c9309..89a750d292ba 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -223,10 +223,13 @@ config TMPFS_INODE64
If unsure, say N.
+config ARCH_SUPPORTS_HUGETLBFS
+ def_bool n
+
config HUGETLBFS
bool "HugeTLB file system support"
depends on X86 || IA64 || SPARC64 || (S390 && 64BIT) || \
- SYS_SUPPORTS_HUGETLBFS || BROKEN
+ ARCH_SUPPORTS_HUGETLBFS || BROKEN
help
hugetlbfs is a filesystem backing for HugeTLB pages, based on
ramfs. For architectures that support it, say Y here and read
diff --git a/fs/block_dev.c b/fs/block_dev.c
index a5244e08b6c8..9114e0a0e7b4 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -79,7 +79,7 @@ static void kill_bdev(struct block_device *bdev)
{
struct address_space *mapping = bdev->bd_inode->i_mapping;
- if (mapping->nrpages == 0 && mapping->nrexceptional == 0)
+ if (mapping_empty(mapping))
return;
invalidate_bh_lrus();
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 17f93fd28f7e..2bea01d23a5b 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -591,16 +591,13 @@ static noinline int add_ra_bio_pages(struct inode *inode,
free_extent_map(em);
if (page->index == end_index) {
- char *userpage;
size_t zero_offset = offset_in_page(isize);
if (zero_offset) {
int zeros;
zeros = PAGE_SIZE - zero_offset;
- userpage = kmap_atomic(page);
- memset(userpage + zero_offset, 0, zeros);
+ memzero_page(page, zero_offset, zeros);
flush_dcache_page(page);
- kunmap_atomic(userpage);
}
}
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index f2d1bb234377..074a78a202b8 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3421,15 +3421,12 @@ int btrfs_do_readpage(struct page *page, struct extent_map **em_cached,
}
if (page->index == last_byte >> PAGE_SHIFT) {
- char *userpage;
size_t zero_offset = offset_in_page(last_byte);
if (zero_offset) {
iosize = PAGE_SIZE - zero_offset;
- userpage = kmap_atomic(page);
- memset(userpage + zero_offset, 0, iosize);
+ memzero_page(page, zero_offset, iosize);
flush_dcache_page(page);
- kunmap_atomic(userpage);
}
}
begin_page_read(fs_info, page);
@@ -3438,14 +3435,11 @@ int btrfs_do_readpage(struct page *page, struct extent_map **em_cached,
u64 disk_bytenr;
if (cur >= last_byte) {
- char *userpage;
struct extent_state *cached = NULL;
iosize = PAGE_SIZE - pg_offset;
- userpage = kmap_atomic(page);
- memset(userpage + pg_offset, 0, iosize);
+ memzero_page(page, pg_offset, iosize);
flush_dcache_page(page);
- kunmap_atomic(userpage);
set_extent_uptodate(tree, cur, cur + iosize - 1,
&cached, GFP_NOFS);
unlock_extent_cached(tree, cur,
@@ -3528,13 +3522,10 @@ int btrfs_do_readpage(struct page *page, struct extent_map **em_cached,
/* we've found a hole, just zero and go on */
if (block_start == EXTENT_MAP_HOLE) {
- char *userpage;
struct extent_state *cached = NULL;
- userpage = kmap_atomic(page);
- memset(userpage + pg_offset, 0, iosize);
+ memzero_page(page, pg_offset, iosize);
flush_dcache_page(page);
- kunmap_atomic(userpage);
set_extent_uptodate(tree, cur, cur + iosize - 1,
&cached, GFP_NOFS);
@@ -3845,12 +3836,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
}
if (page->index == end_index) {
- char *userpage;
-
- userpage = kmap_atomic(page);
- memset(userpage + pg_offset, 0,
- PAGE_SIZE - pg_offset);
- kunmap_atomic(userpage);
+ memzero_page(page, pg_offset, PAGE_SIZE - pg_offset);
flush_dcache_page(page);
}
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index b21d491b3adc..4af336008b12 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -646,17 +646,12 @@ again:
if (!ret) {
unsigned long offset = offset_in_page(total_compressed);
struct page *page = pages[nr_pages - 1];
- char *kaddr;
/* zero the tail end of the last page, we might be
* sending it down to disk
*/
- if (offset) {
- kaddr = kmap_atomic(page);
- memset(kaddr + offset, 0,
- PAGE_SIZE - offset);
- kunmap_atomic(kaddr);
- }
+ if (offset)
+ memzero_page(page, offset, PAGE_SIZE - offset);
will_compress = 1;
}
}
@@ -4833,7 +4828,6 @@ int btrfs_truncate_block(struct btrfs_inode *inode, loff_t from, loff_t len,
struct btrfs_ordered_extent *ordered;
struct extent_state *cached_state = NULL;
struct extent_changeset *data_reserved = NULL;
- char *kaddr;
bool only_release_metadata = false;
u32 blocksize = fs_info->sectorsize;
pgoff_t index = from >> PAGE_SHIFT;
@@ -4925,15 +4919,13 @@ again:
if (offset != blocksize) {
if (!len)
len = blocksize - offset;
- kaddr = kmap(page);
if (front)
- memset(kaddr + (block_start - page_offset(page)),
- 0, offset);
+ memzero_page(page, (block_start - page_offset(page)),
+ offset);
else
- memset(kaddr + (block_start - page_offset(page)) + offset,
- 0, len);
+ memzero_page(page, (block_start - page_offset(page)) + offset,
+ len);
flush_dcache_page(page);
- kunmap(page);
}
ClearPageChecked(page);
set_page_dirty(page);
@@ -6832,11 +6824,9 @@ static noinline int uncompress_inline(struct btrfs_path *path,
* cover that region here.
*/
- if (max_size + pg_offset < PAGE_SIZE) {
- char *map = kmap(page);
- memset(map + pg_offset + max_size, 0, PAGE_SIZE - max_size - pg_offset);
- kunmap(page);
- }
+ if (max_size + pg_offset < PAGE_SIZE)
+ memzero_page(page, pg_offset + max_size,
+ PAGE_SIZE - max_size - pg_offset);
kfree(tmp);
return ret;
}
@@ -8506,7 +8496,6 @@ vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf)
struct btrfs_ordered_extent *ordered;
struct extent_state *cached_state = NULL;
struct extent_changeset *data_reserved = NULL;
- char *kaddr;
unsigned long zero_start;
loff_t size;
vm_fault_t ret;
@@ -8620,10 +8609,8 @@ again:
zero_start = PAGE_SIZE;
if (zero_start != PAGE_SIZE) {
- kaddr = kmap(page);
- memset(kaddr + zero_start, 0, PAGE_SIZE - zero_start);
+ memzero_page(page, zero_start, PAGE_SIZE - zero_start);
flush_dcache_page(page);
- kunmap(page);
}
ClearPageChecked(page);
set_page_dirty(page);
diff --git a/fs/btrfs/reflink.c b/fs/btrfs/reflink.c
index f4ec06b53aa0..3928ecc40d7b 100644
--- a/fs/btrfs/reflink.c
+++ b/fs/btrfs/reflink.c
@@ -129,12 +129,8 @@ static int copy_inline_to_page(struct btrfs_inode *inode,
* So what's in the range [500, 4095] corresponds to zeroes.
*/
if (datal < block_size) {
- char *map;
-
- map = kmap(page);
- memset(map + datal, 0, block_size - datal);
+ memzero_page(page, datal, block_size - datal);
flush_dcache_page(page);
- kunmap(page);
}
SetPageUptodate(page);
diff --git a/fs/btrfs/zlib.c b/fs/btrfs/zlib.c
index d524acf7b3e5..c3fa7d3fa770 100644
--- a/fs/btrfs/zlib.c
+++ b/fs/btrfs/zlib.c
@@ -375,7 +375,6 @@ int zlib_decompress(struct list_head *ws, unsigned char *data_in,
unsigned long bytes_left;
unsigned long total_out = 0;
unsigned long pg_offset = 0;
- char *kaddr;
destlen = min_t(unsigned long, destlen, PAGE_SIZE);
bytes_left = destlen;
@@ -455,9 +454,7 @@ next:
* end of the inline extent (destlen) to the end of the page
*/
if (pg_offset < destlen) {
- kaddr = kmap_atomic(dest_page);
- memset(kaddr + pg_offset, 0, destlen - pg_offset);
- kunmap_atomic(kaddr);
+ memzero_page(dest_page, pg_offset, destlen - pg_offset);
}
return ret;
}
diff --git a/fs/btrfs/zstd.c b/fs/btrfs/zstd.c
index 8e9626d63976..3e26b466476a 100644
--- a/fs/btrfs/zstd.c
+++ b/fs/btrfs/zstd.c
@@ -631,7 +631,6 @@ int zstd_decompress(struct list_head *ws, unsigned char *data_in,
size_t ret2;
unsigned long total_out = 0;
unsigned long pg_offset = 0;
- char *kaddr;
stream = ZSTD_initDStream(
ZSTD_BTRFS_MAX_INPUT, workspace->mem, workspace->size);
@@ -696,9 +695,7 @@ int zstd_decompress(struct list_head *ws, unsigned char *data_in,
ret = 0;
finish:
if (pg_offset < destlen) {
- kaddr = kmap_atomic(dest_page);
- memset(kaddr + pg_offset, 0, destlen - pg_offset);
- kunmap_atomic(kaddr);
+ memzero_page(dest_page, pg_offset, destlen - pg_offset);
}
return ret;
}
diff --git a/fs/buffer.c b/fs/buffer.c
index c2e052c0fc5d..ea48c01fb76b 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1260,6 +1260,15 @@ static void bh_lru_install(struct buffer_head *bh)
int i;
check_irqs_on();
+ /*
+ * the refcount of buffer_head in bh_lru prevents dropping the
+ * attached page(i.e., try_to_free_buffers) so it could cause
+ * failing page migration.
+ * Skip putting upcoming bh into bh_lru until migration is done.
+ */
+ if (lru_cache_disabled())
+ return;
+
bh_lru_lock();
b = this_cpu_ptr(&bh_lrus);
@@ -1400,6 +1409,15 @@ __bread_gfp(struct block_device *bdev, sector_t block,
}
EXPORT_SYMBOL(__bread_gfp);
+static void __invalidate_bh_lrus(struct bh_lru *b)
+{
+ int i;
+
+ for (i = 0; i < BH_LRU_SIZE; i++) {
+ brelse(b->bhs[i]);
+ b->bhs[i] = NULL;
+ }
+}
/*
* invalidate_bh_lrus() is called rarely - but not only at unmount.
* This doesn't race because it runs in each cpu either in irq
@@ -1408,16 +1426,12 @@ EXPORT_SYMBOL(__bread_gfp);
static void invalidate_bh_lru(void *arg)
{
struct bh_lru *b = &get_cpu_var(bh_lrus);
- int i;
- for (i = 0; i < BH_LRU_SIZE; i++) {
- brelse(b->bhs[i]);
- b->bhs[i] = NULL;
- }
+ __invalidate_bh_lrus(b);
put_cpu_var(bh_lrus);
}
-static bool has_bh_in_lru(int cpu, void *dummy)
+bool has_bh_in_lru(int cpu, void *dummy)
{
struct bh_lru *b = per_cpu_ptr(&bh_lrus, cpu);
int i;
@@ -1436,6 +1450,16 @@ void invalidate_bh_lrus(void)
}
EXPORT_SYMBOL_GPL(invalidate_bh_lrus);
+void invalidate_bh_lrus_cpu(int cpu)
+{
+ struct bh_lru *b;
+
+ bh_lru_lock();
+ b = per_cpu_ptr(&bh_lrus, cpu);
+ __invalidate_bh_lrus(b);
+ bh_lru_unlock();
+}
+
void set_bh_page(struct buffer_head *bh,
struct page *page, unsigned long offset)
{
diff --git a/fs/dax.c b/fs/dax.c
index b3d27fdc6775..69216241392f 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -525,7 +525,7 @@ retry:
dax_disassociate_entry(entry, mapping, false);
xas_store(xas, NULL); /* undo the PMD join */
dax_wake_entry(xas, entry, true);
- mapping->nrexceptional--;
+ mapping->nrpages -= PG_PMD_NR;
entry = NULL;
xas_set(xas, index);
}
@@ -541,7 +541,7 @@ retry:
dax_lock_entry(xas, entry);
if (xas_error(xas))
goto out_unlock;
- mapping->nrexceptional++;
+ mapping->nrpages += 1UL << order;
}
out_unlock:
@@ -661,7 +661,7 @@ static int __dax_invalidate_entry(struct address_space *mapping,
goto out;
dax_disassociate_entry(entry, mapping, trunc);
xas_store(&xas, NULL);
- mapping->nrexceptional--;
+ mapping->nrpages -= 1UL << dax_entry_order(entry);
ret = 1;
out:
put_unlocked_entry(&xas, entry);
@@ -965,7 +965,7 @@ int dax_writeback_mapping_range(struct address_space *mapping,
if (WARN_ON_ONCE(inode->i_blkbits != PAGE_SHIFT))
return -EIO;
- if (!mapping->nrexceptional || wbc->sync_mode != WB_SYNC_ALL)
+ if (mapping_empty(mapping) || wbc->sync_mode != WB_SYNC_ALL)
return 0;
trace_dax_writeback_range(inode, xas.xa_index, end_index);
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 84c38103aa06..ea7fc5c641c7 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -273,8 +273,7 @@ static void __gfs2_glock_put(struct gfs2_glock *gl)
if (mapping) {
truncate_inode_pages_final(mapping);
if (!gfs2_withdrawn(sdp))
- GLOCK_BUG_ON(gl, mapping->nrpages ||
- mapping->nrexceptional);
+ GLOCK_BUG_ON(gl, !mapping_empty(mapping));
}
trace_gfs2_glock_put(gl);
sdp->sd_lockstruct.ls_ops->lm_put_lock(gl);
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 701c82c36138..a2a42335e8fd 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -463,14 +463,11 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart,
struct address_space *mapping = &inode->i_data;
const pgoff_t start = lstart >> huge_page_shift(h);
const pgoff_t end = lend >> huge_page_shift(h);
- struct vm_area_struct pseudo_vma;
struct pagevec pvec;
pgoff_t next, index;
int i, freed = 0;
bool truncate_op = (lend == LLONG_MAX);
- vma_init(&pseudo_vma, current->mm);
- pseudo_vma.vm_flags = (VM_HUGETLB | VM_MAYSHARE | VM_SHARED);
pagevec_init(&pvec);
next = start;
while (next < end) {
@@ -482,10 +479,9 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart,
for (i = 0; i < pagevec_count(&pvec); ++i) {
struct page *page = pvec.pages[i];
- u32 hash;
+ u32 hash = 0;
index = page->index;
- hash = hugetlb_fault_mutex_hash(mapping, index);
if (!truncate_op) {
/*
* Only need to hold the fault mutex in the
@@ -493,6 +489,7 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart,
* page faults. Races are not possible in the
* case of truncation.
*/
+ hash = hugetlb_fault_mutex_hash(mapping, index);
mutex_lock(&hugetlb_fault_mutex_table[hash]);
}
@@ -1435,7 +1432,7 @@ static int get_hstate_idx(int page_size_log)
if (!h)
return -1;
- return h - hstates;
+ return hstate_index(h);
}
/*
diff --git a/fs/inode.c b/fs/inode.c
index 9e192bea0630..c93500d84264 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -529,7 +529,14 @@ void clear_inode(struct inode *inode)
*/
xa_lock_irq(&inode->i_data.i_pages);
BUG_ON(inode->i_data.nrpages);
- BUG_ON(inode->i_data.nrexceptional);
+ /*
+ * Almost always, mapping_empty(&inode->i_data) here; but there are
+ * two known and long-standing ways in which nodes may get left behind
+ * (when deep radix-tree node allocation failed partway; or when THP
+ * collapse_file() failed). Until those two known cases are cleaned up,
+ * or a cleanup function is called here, do not BUG_ON(!mapping_empty),
+ * nor even WARN_ON(!mapping_empty).
+ */
xa_unlock_irq(&inode->i_data.i_pages);
BUG_ON(!list_empty(&inode->i_data.private_list));
BUG_ON(!(inode->i_state & I_FREEING));
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index e862cab69583..fc9784544b24 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -661,6 +661,9 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
[ilog2(VM_PKEY_BIT4)] = "",
#endif
#endif /* CONFIG_ARCH_HAS_PKEYS */
+#ifdef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR
+ [ilog2(VM_UFFD_MINOR)] = "ui",
+#endif /* CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */
};
size_t i;
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index 0be8cdd4425a..14f92285d04f 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -15,6 +15,7 @@
#include <linux/sched/signal.h>
#include <linux/sched/mm.h>
#include <linux/mm.h>
+#include <linux/mmu_notifier.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
@@ -196,24 +197,21 @@ static inline struct uffd_msg userfault_msg(unsigned long address,
msg_init(&msg);
msg.event = UFFD_EVENT_PAGEFAULT;
msg.arg.pagefault.address = address;
+ /*
+ * These flags indicate why the userfault occurred:
+ * - UFFD_PAGEFAULT_FLAG_WP indicates a write protect fault.
+ * - UFFD_PAGEFAULT_FLAG_MINOR indicates a minor fault.
+ * - Neither of these flags being set indicates a MISSING fault.
+ *
+ * Separately, UFFD_PAGEFAULT_FLAG_WRITE indicates it was a write
+ * fault. Otherwise, it was a read fault.
+ */
if (flags & FAULT_FLAG_WRITE)
- /*
- * If UFFD_FEATURE_PAGEFAULT_FLAG_WP was set in the
- * uffdio_api.features and UFFD_PAGEFAULT_FLAG_WRITE
- * was not set in a UFFD_EVENT_PAGEFAULT, it means it
- * was a read fault, otherwise if set it means it's
- * a write fault.
- */
msg.arg.pagefault.flags |= UFFD_PAGEFAULT_FLAG_WRITE;
if (reason & VM_UFFD_WP)
- /*
- * If UFFD_FEATURE_PAGEFAULT_FLAG_WP was set in the
- * uffdio_api.features and UFFD_PAGEFAULT_FLAG_WP was
- * not set in a UFFD_EVENT_PAGEFAULT, it means it was
- * a missing fault, otherwise if set it means it's a
- * write protect fault.
- */
msg.arg.pagefault.flags |= UFFD_PAGEFAULT_FLAG_WP;
+ if (reason & VM_UFFD_MINOR)
+ msg.arg.pagefault.flags |= UFFD_PAGEFAULT_FLAG_MINOR;
if (features & UFFD_FEATURE_THREAD_ID)
msg.arg.pagefault.feat.ptid = task_pid_vnr(current);
return msg;
@@ -400,8 +398,10 @@ vm_fault_t handle_userfault(struct vm_fault *vmf, unsigned long reason)
BUG_ON(ctx->mm != mm);
- VM_BUG_ON(reason & ~(VM_UFFD_MISSING|VM_UFFD_WP));
- VM_BUG_ON(!(reason & VM_UFFD_MISSING) ^ !!(reason & VM_UFFD_WP));
+ /* Any unrecognized flag is a bug. */
+ VM_BUG_ON(reason & ~__VM_UFFD_FLAGS);
+ /* 0 or > 1 flags set is a bug; we expect exactly 1. */
+ VM_BUG_ON(!reason || (reason & (reason - 1)));
if (ctx->features & UFFD_FEATURE_SIGBUS)
goto out;
@@ -611,7 +611,7 @@ static void userfaultfd_event_wait_completion(struct userfaultfd_ctx *ctx,
for (vma = mm->mmap; vma; vma = vma->vm_next)
if (vma->vm_userfaultfd_ctx.ctx == release_new_ctx) {
vma->vm_userfaultfd_ctx = NULL_VM_UFFD_CTX;
- vma->vm_flags &= ~(VM_UFFD_WP | VM_UFFD_MISSING);
+ vma->vm_flags &= ~__VM_UFFD_FLAGS;
}
mmap_write_unlock(mm);
@@ -643,7 +643,7 @@ int dup_userfaultfd(struct vm_area_struct *vma, struct list_head *fcs)
octx = vma->vm_userfaultfd_ctx.ctx;
if (!octx || !(octx->features & UFFD_FEATURE_EVENT_FORK)) {
vma->vm_userfaultfd_ctx = NULL_VM_UFFD_CTX;
- vma->vm_flags &= ~(VM_UFFD_WP | VM_UFFD_MISSING);
+ vma->vm_flags &= ~__VM_UFFD_FLAGS;
return 0;
}
@@ -725,7 +725,7 @@ void mremap_userfaultfd_prep(struct vm_area_struct *vma,
} else {
/* Drop uffd context if remap feature not enabled */
vma->vm_userfaultfd_ctx = NULL_VM_UFFD_CTX;
- vma->vm_flags &= ~(VM_UFFD_WP | VM_UFFD_MISSING);
+ vma->vm_flags &= ~__VM_UFFD_FLAGS;
}
}
@@ -866,12 +866,12 @@ static int userfaultfd_release(struct inode *inode, struct file *file)
for (vma = mm->mmap; vma; vma = vma->vm_next) {
cond_resched();
BUG_ON(!!vma->vm_userfaultfd_ctx.ctx ^
- !!(vma->vm_flags & (VM_UFFD_MISSING | VM_UFFD_WP)));
+ !!(vma->vm_flags & __VM_UFFD_FLAGS));
if (vma->vm_userfaultfd_ctx.ctx != ctx) {
prev = vma;
continue;
}
- new_flags = vma->vm_flags & ~(VM_UFFD_MISSING | VM_UFFD_WP);
+ new_flags = vma->vm_flags & ~__VM_UFFD_FLAGS;
prev = vma_merge(mm, prev, vma->vm_start, vma->vm_end,
new_flags, vma->anon_vma,
vma->vm_file, vma->vm_pgoff,
@@ -1261,9 +1261,19 @@ static inline bool vma_can_userfault(struct vm_area_struct *vma,
unsigned long vm_flags)
{
/* FIXME: add WP support to hugetlbfs and shmem */
- return vma_is_anonymous(vma) ||
- ((is_vm_hugetlb_page(vma) || vma_is_shmem(vma)) &&
- !(vm_flags & VM_UFFD_WP));
+ if (vm_flags & VM_UFFD_WP) {
+ if (is_vm_hugetlb_page(vma) || vma_is_shmem(vma))
+ return false;
+ }
+
+ if (vm_flags & VM_UFFD_MINOR) {
+ /* FIXME: Add minor fault interception for shmem. */
+ if (!is_vm_hugetlb_page(vma))
+ return false;
+ }
+
+ return vma_is_anonymous(vma) || is_vm_hugetlb_page(vma) ||
+ vma_is_shmem(vma);
}
static int userfaultfd_register(struct userfaultfd_ctx *ctx,
@@ -1289,14 +1299,19 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx,
ret = -EINVAL;
if (!uffdio_register.mode)
goto out;
- if (uffdio_register.mode & ~(UFFDIO_REGISTER_MODE_MISSING|
- UFFDIO_REGISTER_MODE_WP))
+ if (uffdio_register.mode & ~UFFD_API_REGISTER_MODES)
goto out;
vm_flags = 0;
if (uffdio_register.mode & UFFDIO_REGISTER_MODE_MISSING)
vm_flags |= VM_UFFD_MISSING;
if (uffdio_register.mode & UFFDIO_REGISTER_MODE_WP)
vm_flags |= VM_UFFD_WP;
+ if (uffdio_register.mode & UFFDIO_REGISTER_MODE_MINOR) {
+#ifndef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR
+ goto out;
+#endif
+ vm_flags |= VM_UFFD_MINOR;
+ }
ret = validate_range(mm, &uffdio_register.range.start,
uffdio_register.range.len);
@@ -1340,7 +1355,7 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx,
cond_resched();
BUG_ON(!!cur->vm_userfaultfd_ctx.ctx ^
- !!(cur->vm_flags & (VM_UFFD_MISSING | VM_UFFD_WP)));
+ !!(cur->vm_flags & __VM_UFFD_FLAGS));
/* check not compatible vmas */
ret = -EINVAL;
@@ -1420,8 +1435,7 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx,
start = vma->vm_start;
vma_end = min(end, vma->vm_end);
- new_flags = (vma->vm_flags &
- ~(VM_UFFD_MISSING|VM_UFFD_WP)) | vm_flags;
+ new_flags = (vma->vm_flags & ~__VM_UFFD_FLAGS) | vm_flags;
prev = vma_merge(mm, prev, start, vma_end, new_flags,
vma->anon_vma, vma->vm_file, vma->vm_pgoff,
vma_policy(vma),
@@ -1449,6 +1463,9 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx,
vma->vm_flags = new_flags;
vma->vm_userfaultfd_ctx.ctx = ctx;
+ if (is_vm_hugetlb_page(vma) && uffd_disable_huge_pmd_share(vma))
+ hugetlb_unshare_all_pmds(vma);
+
skip:
prev = vma;
start = vma->vm_end;
@@ -1470,6 +1487,10 @@ out_unlock:
if (!(uffdio_register.mode & UFFDIO_REGISTER_MODE_WP))
ioctls_out &= ~((__u64)1 << _UFFDIO_WRITEPROTECT);
+ /* CONTINUE ioctl is only supported for MINOR ranges. */
+ if (!(uffdio_register.mode & UFFDIO_REGISTER_MODE_MINOR))
+ ioctls_out &= ~((__u64)1 << _UFFDIO_CONTINUE);
+
/*
* Now that we scanned all vmas we can already tell
* userland which ioctls methods are guaranteed to
@@ -1540,7 +1561,7 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx,
cond_resched();
BUG_ON(!!cur->vm_userfaultfd_ctx.ctx ^
- !!(cur->vm_flags & (VM_UFFD_MISSING | VM_UFFD_WP)));
+ !!(cur->vm_flags & __VM_UFFD_FLAGS));
/*
* Check not compatible vmas, not strictly required
@@ -1591,7 +1612,7 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx,
wake_userfault(vma->vm_userfaultfd_ctx.ctx, &range);
}
- new_flags = vma->vm_flags & ~(VM_UFFD_MISSING | VM_UFFD_WP);
+ new_flags = vma->vm_flags & ~__VM_UFFD_FLAGS;
prev = vma_merge(mm, prev, start, vma_end, new_flags,
vma->anon_vma, vma->vm_file, vma->vm_pgoff,
vma_policy(vma),
@@ -1823,6 +1844,66 @@ static int userfaultfd_writeprotect(struct userfaultfd_ctx *ctx,
return ret;
}
+static int userfaultfd_continue(struct userfaultfd_ctx *ctx, unsigned long arg)
+{
+ __s64 ret;
+ struct uffdio_continue uffdio_continue;
+ struct uffdio_continue __user *user_uffdio_continue;
+ struct userfaultfd_wake_range range;
+
+ user_uffdio_continue = (struct uffdio_continue __user *)arg;
+
+ ret = -EAGAIN;
+ if (READ_ONCE(ctx->mmap_changing))
+ goto out;
+
+ ret = -EFAULT;
+ if (copy_from_user(&uffdio_continue, user_uffdio_continue,
+ /* don't copy the output fields */
+ sizeof(uffdio_continue) - (sizeof(__s64))))
+ goto out;
+
+ ret = validate_range(ctx->mm, &uffdio_continue.range.start,
+ uffdio_continue.range.len);
+ if (ret)
+ goto out;
+
+ ret = -EINVAL;
+ /* double check for wraparound just in case. */
+ if (uffdio_continue.range.start + uffdio_continue.range.len <=
+ uffdio_continue.range.start) {
+ goto out;
+ }
+ if (uffdio_continue.mode & ~UFFDIO_CONTINUE_MODE_DONTWAKE)
+ goto out;
+
+ if (mmget_not_zero(ctx->mm)) {
+ ret = mcopy_continue(ctx->mm, uffdio_continue.range.start,
+ uffdio_continue.range.len,
+ &ctx->mmap_changing);
+ mmput(ctx->mm);
+ } else {
+ return -ESRCH;
+ }
+
+ if (unlikely(put_user(ret, &user_uffdio_continue->mapped)))
+ return -EFAULT;
+ if (ret < 0)
+ goto out;
+
+ /* len == 0 would wake all */
+ BUG_ON(!ret);
+ range.len = ret;
+ if (!(uffdio_continue.mode & UFFDIO_CONTINUE_MODE_DONTWAKE)) {
+ range.start = uffdio_continue.range.start;
+ wake_userfault(ctx, &range);
+ }
+ ret = range.len == uffdio_continue.range.len ? 0 : -EAGAIN;
+
+out:
+ return ret;
+}
+
static inline unsigned int uffd_ctx_features(__u64 user_features)
{
/*
@@ -1859,6 +1940,9 @@ static int userfaultfd_api(struct userfaultfd_ctx *ctx,
goto err_out;
/* report all available features and ioctls to userland */
uffdio_api.features = UFFD_API_FEATURES;
+#ifndef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR
+ uffdio_api.features &= ~UFFD_FEATURE_MINOR_HUGETLBFS;
+#endif
uffdio_api.ioctls = UFFD_API_IOCTLS;
ret = -EFAULT;
if (copy_to_user(buf, &uffdio_api, sizeof(uffdio_api)))
@@ -1907,6 +1991,9 @@ static long userfaultfd_ioctl(struct file *file, unsigned cmd,
case UFFDIO_WRITEPROTECT:
ret = userfaultfd_writeprotect(ctx, arg);
break;
+ case UFFDIO_CONTINUE:
+ ret = userfaultfd_continue(ctx, arg);
+ break;
}
return ret;
}
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 6b47f94378c5..e7e99da31349 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -194,6 +194,8 @@ void __breadahead_gfp(struct block_device *, sector_t block, unsigned int size,
struct buffer_head *__bread_gfp(struct block_device *,
sector_t block, unsigned size, gfp_t gfp);
void invalidate_bh_lrus(void);
+void invalidate_bh_lrus_cpu(int cpu);
+bool has_bh_in_lru(int cpu, void *dummy);
struct buffer_head *alloc_buffer_head(gfp_t gfp_flags);
void free_buffer_head(struct buffer_head * bh);
void unlock_buffer(struct buffer_head *bh);
@@ -406,6 +408,8 @@ static inline int inode_has_buffers(struct inode *inode) { return 0; }
static inline void invalidate_inode_buffers(struct inode *inode) {}
static inline int remove_inode_buffers(struct inode *inode) { return 1; }
static inline int sync_mapping_buffers(struct address_space *mapping) { return 0; }
+static inline void invalidate_bh_lrus_cpu(int cpu) {}
+static inline bool has_bh_in_lru(int cpu, void *dummy) { return 0; }
#define buffer_heads_over_limit 0
#endif /* CONFIG_BLOCK */
diff --git a/include/linux/cma.h b/include/linux/cma.h
index 217999c8a762..53fd8c3cdbd0 100644
--- a/include/linux/cma.h
+++ b/include/linux/cma.h
@@ -44,9 +44,9 @@ extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
unsigned int order_per_bit,
const char *name,
struct cma **res_cma);
-extern struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
+extern struct page *cma_alloc(struct cma *cma, unsigned long count, unsigned int align,
bool no_warn);
-extern bool cma_release(struct cma *cma, const struct page *pages, unsigned int count);
+extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long count);
extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
#endif
diff --git a/include/linux/compaction.h b/include/linux/compaction.h
index ed4070ed41ef..4221888bdcd6 100644
--- a/include/linux/compaction.h
+++ b/include/linux/compaction.h
@@ -81,7 +81,6 @@ static inline unsigned long compact_gap(unsigned int order)
}
#ifdef CONFIG_COMPACTION
-extern int sysctl_compact_memory;
extern unsigned int sysctl_compaction_proactiveness;
extern int sysctl_compaction_handler(struct ctl_table *table, int write,
void *buffer, size_t *length, loff_t *ppos);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 12766edee81f..acef282b97c6 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -442,7 +442,6 @@ int pagecache_write_end(struct file *, struct address_space *mapping,
* @i_mmap: Tree of private and shared mappings.
* @i_mmap_rwsem: Protects @i_mmap and @i_mmap_writable.
* @nrpages: Number of page entries, protected by the i_pages lock.
- * @nrexceptional: Shadow or DAX entries, protected by the i_pages lock.
* @writeback_index: Writeback starts here.
* @a_ops: Methods.
* @flags: Error bits and flags (AS_*).
@@ -463,7 +462,6 @@ struct address_space {
struct rb_root_cached i_mmap;
struct rw_semaphore i_mmap_rwsem;
unsigned long nrpages;
- unsigned long nrexceptional;
pgoff_t writeback_index;
const struct address_space_operations *a_ops;
unsigned long flags;
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 26f4d907254a..8a5f6c3d7dba 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -657,7 +657,7 @@ extern int alloc_contig_range(unsigned long start, unsigned long end,
extern struct page *alloc_contig_pages(unsigned long nr_pages, gfp_t gfp_mask,
int nid, nodemask_t *nodemask);
#endif
-void free_contig_range(unsigned long pfn, unsigned int nr_pages);
+void free_contig_range(unsigned long pfn, unsigned long nr_pages);
#ifdef CONFIG_CMA
/* CMA stuff */
diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index 44170f312ae7..832b49b50c7b 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -332,4 +332,11 @@ static inline void memcpy_to_page(struct page *page, size_t offset,
kunmap_local(to);
}
+static inline void memzero_page(struct page *page, size_t offset, size_t len)
+{
+ char *addr = kmap_atomic(page);
+ memset(addr + offset, 0, len);
+ kunmap_atomic(addr);
+}
+
#endif /* _LINUX_HIGHMEM_H */
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index ba973efcd369..9626fda5efce 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -87,9 +87,6 @@ enum transparent_hugepage_flag {
TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
-#ifdef CONFIG_DEBUG_VM
- TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
-#endif
};
struct kobject;
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index cccd1aab69dd..b92f25ccef58 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -11,6 +11,7 @@
#include <linux/kref.h>
#include <linux/pgtable.h>
#include <linux/gfp.h>
+#include <linux/userfaultfd_k.h>
struct ctl_table;
struct user_struct;
@@ -134,11 +135,14 @@ void hugetlb_show_meminfo(void);
unsigned long hugetlb_total_pages(void);
vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, unsigned int flags);
+#ifdef CONFIG_USERFAULTFD
int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte,
struct vm_area_struct *dst_vma,
unsigned long dst_addr,
unsigned long src_addr,
+ enum mcopy_atomic_mode mode,
struct page **pagep);
+#endif /* CONFIG_USERFAULTFD */
bool hugetlb_reserve_pages(struct inode *inode, long from, long to,
struct vm_area_struct *vma,
vm_flags_t vm_flags);
@@ -152,7 +156,8 @@ void hugetlb_fix_reserve_counts(struct inode *inode);
extern struct mutex *hugetlb_fault_mutex_table;
u32 hugetlb_fault_mutex_hash(struct address_space *mapping, pgoff_t idx);
-pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
+pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct *vma,
+ unsigned long addr, pud_t *pud);
struct address_space *hugetlb_page_mapping_lock_write(struct page *hpage);
@@ -161,7 +166,7 @@ extern struct list_head huge_boot_pages;
/* arch callbacks */
-pte_t *huge_pte_alloc(struct mm_struct *mm,
+pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long addr, unsigned long sz);
pte_t *huge_pte_offset(struct mm_struct *mm,
unsigned long addr, unsigned long sz);
@@ -187,6 +192,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
unsigned long address, unsigned long end, pgprot_t newprot);
bool is_hugetlb_entry_migration(pte_t pte);
+void hugetlb_unshare_all_pmds(struct vm_area_struct *vma);
#else /* !CONFIG_HUGETLB_PAGE */
@@ -308,16 +314,19 @@ static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
BUG();
}
+#ifdef CONFIG_USERFAULTFD
static inline int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
pte_t *dst_pte,
struct vm_area_struct *dst_vma,
unsigned long dst_addr,
unsigned long src_addr,
+ enum mcopy_atomic_mode mode,
struct page **pagep)
{
BUG();
return 0;
}
+#endif /* CONFIG_USERFAULTFD */
static inline pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
unsigned long sz)
@@ -368,6 +377,8 @@ static inline vm_fault_t hugetlb_fault(struct mm_struct *mm,
return 0;
}
+static inline void hugetlb_unshare_all_pmds(struct vm_area_struct *vma) { }
+
#endif /* !CONFIG_HUGETLB_PAGE */
/*
* hugepages at page global directory. If arch support
@@ -555,6 +566,7 @@ HPAGEFLAG(Freed, freed)
#define HSTATE_NAME_LEN 32
/* Defines one hugetlb page size */
struct hstate {
+ struct mutex resize_lock;
int next_nid_to_alloc;
int next_nid_to_free;
unsigned int order;
@@ -583,6 +595,7 @@ struct huge_bootmem_page {
struct hstate *hstate;
};
+int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list);
struct page *alloc_huge_page(struct vm_area_struct *vma,
unsigned long addr, int avoid_reserve);
struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
@@ -865,6 +878,12 @@ static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
#else /* CONFIG_HUGETLB_PAGE */
struct hstate {};
+static inline int isolate_or_dissolve_huge_page(struct page *page,
+ struct list_head *list)
+{
+ return -ENOMEM;
+}
+
static inline struct page *alloc_huge_page(struct vm_area_struct *vma,
unsigned long addr,
int avoid_reserve)
@@ -1039,4 +1058,14 @@ static inline __init void hugetlb_cma_check(void)
}
#endif
+bool want_pmd_share(struct vm_area_struct *vma, unsigned long addr);
+
+#ifndef __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE
+/*
+ * ARCHes with special requirements for evicting HUGETLB backing TLB entries can
+ * implement this.
+ */
+#define flush_hugetlb_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end)
+#endif
+
#endif /* _LINUX_HUGETLB_H */
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 5904716f29ba..c193be760709 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -114,12 +114,13 @@ struct batched_lruvec_stat {
};
/*
- * Bitmap of shrinker::id corresponding to memcg-aware shrinkers,
- * which have elements charged to this memcg.
+ * Bitmap and deferred work of shrinker::id corresponding to memcg-aware
+ * shrinkers, which have elements charged to this memcg.
*/
-struct memcg_shrinker_map {
+struct shrinker_info {
struct rcu_head rcu;
- unsigned long map[];
+ atomic_long_t *nr_deferred;
+ unsigned long *map;
};
/*
@@ -145,7 +146,7 @@ struct mem_cgroup_per_node {
struct mem_cgroup_reclaim_iter iter;
- struct memcg_shrinker_map __rcu *shrinker_map;
+ struct shrinker_info __rcu *shrinker_info;
struct rb_node tree_node; /* RB tree node */
unsigned long usage_in_excess;/* Set to the value by which */
@@ -1610,10 +1611,10 @@ static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
return false;
}
-extern int memcg_expand_shrinker_maps(int new_id);
-
-extern void memcg_set_shrinker_bit(struct mem_cgroup *memcg,
- int nid, int shrinker_id);
+int alloc_shrinker_info(struct mem_cgroup *memcg);
+void free_shrinker_info(struct mem_cgroup *memcg);
+void set_shrinker_bit(struct mem_cgroup *memcg, int nid, int shrinker_id);
+void reparent_shrinker_deferred(struct mem_cgroup *memcg);
#else
#define mem_cgroup_sockets_enabled 0
static inline void mem_cgroup_sk_alloc(struct sock *sk) { };
@@ -1623,8 +1624,8 @@ static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg)
return false;
}
-static inline void memcg_set_shrinker_bit(struct mem_cgroup *memcg,
- int nid, int shrinker_id)
+static inline void set_shrinker_bit(struct mem_cgroup *memcg,
+ int nid, int shrinker_id)
{
}
#endif
diff --git a/include/linux/memory.h b/include/linux/memory.h
index 4da95e684e20..97e92e8b556a 100644
--- a/include/linux/memory.h
+++ b/include/linux/memory.h
@@ -29,6 +29,11 @@ struct memory_block {
int online_type; /* for passing data to online routine */
int nid; /* NID for this memory block */
struct device dev;
+ /*
+ * Number of vmemmap pages. These pages
+ * lay at the beginning of the memory block.
+ */
+ unsigned long nr_vmemmap_pages;
};
int arch_get_memory_phys_device(unsigned long start_pfn);
@@ -80,7 +85,8 @@ static inline int memory_notify(unsigned long val, void *v)
#else
extern int register_memory_notifier(struct notifier_block *nb);
extern void unregister_memory_notifier(struct notifier_block *nb);
-int create_memory_block_devices(unsigned long start, unsigned long size);
+int create_memory_block_devices(unsigned long start, unsigned long size,
+ unsigned long vmemmap_pages);
void remove_memory_block_devices(unsigned long start, unsigned long size);
extern void memory_dev_init(void);
extern int memory_notify(unsigned long val, void *v);
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 7288aa5ef73b..28f32fd00fe9 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -56,6 +56,14 @@ typedef int __bitwise mhp_t;
#define MHP_MERGE_RESOURCE ((__force mhp_t)BIT(0))
/*
+ * We want memmap (struct page array) to be self contained.
+ * To do so, we will use the beginning of the hot-added range to build
+ * the page tables for the memmap array that describes the entire range.
+ * Only selected architectures support it with SPARSE_VMEMMAP.
+ */
+#define MHP_MEMMAP_ON_MEMORY ((__force mhp_t)BIT(1))
+
+/*
* Extended parameters for memory hotplug:
* altmap: alternative allocator for memmap array (optional)
* pgprot: page protection flags to apply to newly created page tables
@@ -99,9 +107,13 @@ static inline void zone_seqlock_init(struct zone *zone)
extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
+extern void adjust_present_page_count(struct zone *zone, long nr_pages);
/* VM interface that may be used by firmware interface */
+extern int mhp_init_memmap_on_memory(unsigned long pfn, unsigned long nr_pages,
+ struct zone *zone);
+extern void mhp_deinit_memmap_on_memory(unsigned long pfn, unsigned long nr_pages);
extern int online_pages(unsigned long pfn, unsigned long nr_pages,
- int online_type, int nid);
+ struct zone *zone);
extern struct zone *test_pages_in_a_zone(unsigned long start_pfn,
unsigned long end_pfn);
extern void __offline_isolated_pages(unsigned long start_pfn,
@@ -359,6 +371,7 @@ extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_
extern int arch_create_linear_mapping(int nid, u64 start, u64 size,
struct mhp_params *params);
void arch_remove_linear_mapping(u64 start, u64 size);
+extern bool mhp_supports_memmap_on_memory(unsigned long size);
#endif /* CONFIG_MEMORY_HOTPLUG */
#endif /* __LINUX_MEMORY_HOTPLUG_H */
diff --git a/include/linux/memremap.h b/include/linux/memremap.h
index f5b464daeeca..45a79da89c5f 100644
--- a/include/linux/memremap.h
+++ b/include/linux/memremap.h
@@ -17,7 +17,7 @@ struct device;
* @alloc: track pages consumed, private to vmemmap_populate()
*/
struct vmem_altmap {
- const unsigned long base_pfn;
+ unsigned long base_pfn;
const unsigned long end_pfn;
const unsigned long reserve;
unsigned long free;
diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 3a389633b68f..4bb4e519e3f5 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -27,6 +27,7 @@ enum migrate_reason {
MR_MEMPOLICY_MBIND,
MR_NUMA_MISPLACED,
MR_CONTIG_RANGE,
+ MR_LONGTERM_PIN,
MR_TYPES
};
@@ -43,10 +44,7 @@ extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
unsigned long private, enum migrate_mode mode, int reason);
extern struct page *alloc_migration_target(struct page *page, unsigned long private);
extern int isolate_movable_page(struct page *page, isolate_mode_t mode);
-extern void putback_movable_page(struct page *page);
-extern void migrate_prep(void);
-extern void migrate_prep_local(void);
extern void migrate_page_states(struct page *newpage, struct page *page);
extern void migrate_page_copy(struct page *newpage, struct page *page);
extern int migrate_huge_page_move_mapping(struct address_space *mapping,
@@ -66,9 +64,6 @@ static inline struct page *alloc_migration_target(struct page *page,
static inline int isolate_movable_page(struct page *page, isolate_mode_t mode)
{ return -EBUSY; }
-static inline int migrate_prep(void) { return -ENOSYS; }
-static inline int migrate_prep_local(void) { return -ENOSYS; }
-
static inline void migrate_page_states(struct page *newpage, struct page *page)
{
}
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 011f43605807..76e27ebb28a3 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -372,6 +372,13 @@ extern unsigned int kobjsize(const void *objp);
# define VM_GROWSUP VM_NONE
#endif
+#ifdef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR
+# define VM_UFFD_MINOR_BIT 37
+# define VM_UFFD_MINOR BIT(VM_UFFD_MINOR_BIT) /* UFFD minor faults */
+#else /* !CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */
+# define VM_UFFD_MINOR VM_NONE
+#endif /* CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */
+
/* Bits set in the VMA until the stack is in its final location */
#define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ)
@@ -1134,6 +1141,11 @@ static inline bool is_zone_device_page(const struct page *page)
}
#endif
+static inline bool is_zone_movable_page(const struct page *page)
+{
+ return page_zonenum(page) == ZONE_MOVABLE;
+}
+
#ifdef CONFIG_DEV_PAGEMAP_OPS
void free_devmap_managed_page(struct page *page);
DECLARE_STATIC_KEY_FALSE(devmap_managed_key);
@@ -1543,6 +1555,20 @@ static inline unsigned long page_to_section(const struct page *page)
}
#endif
+/* MIGRATE_CMA and ZONE_MOVABLE do not allow pin pages */
+#ifdef CONFIG_MIGRATION
+static inline bool is_pinnable_page(struct page *page)
+{
+ return !(is_zone_movable_page(page) || is_migrate_cma_page(page)) ||
+ is_zero_pfn(page_to_pfn(page));
+}
+#else
+static inline bool is_pinnable_page(struct page *page)
+{
+ return true;
+}
+#endif
+
static inline void set_page_zone(struct page *page, enum zone_type zone)
{
page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 3b2205741048..917bd6c604d5 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -407,8 +407,13 @@ enum zone_type {
* to increase the number of THP/huge pages. Notable special cases are:
*
* 1. Pinned pages: (long-term) pinning of movable pages might
- * essentially turn such pages unmovable. Memory offlining might
- * retry a long time.
+ * essentially turn such pages unmovable. Therefore, we do not allow
+ * pinning long-term pages in ZONE_MOVABLE. When pages are pinned and
+ * faulted, they come from the right zone right away. However, it is
+ * still possible that address space already has pages in
+ * ZONE_MOVABLE at the time when pages are pinned (i.e. user has
+ * touches that memory before pinning). In such case we migrate them
+ * to a different zone. When migration fails - pinning fails.
* 2. memblock allocations: kernelcore/movablecore setups might create
* situations where ZONE_MOVABLE contains unmovable allocations
* after boot. Memory offlining and allocations fail early.
@@ -427,6 +432,15 @@ enum zone_type {
* techniques might use alloc_contig_range() to hide previously
* exposed pages from the buddy again (e.g., to implement some sort
* of memory unplug in virtio-mem).
+ * 6. ZERO_PAGE(0), kernelcore/movablecore setups might create
+ * situations where ZERO_PAGE(0) which is allocated differently
+ * on different platforms may end up in a movable zone. ZERO_PAGE(0)
+ * cannot be migrated.
+ * 7. Memory-hotplug: when using memmap_on_memory and onlining the
+ * memory to the MOVABLE zone, the vmemmap pages are also placed in
+ * such zone. Such pages cannot be really moved around as they are
+ * self-stored in the range, but they are treated as movable when
+ * the range they describe is about to be offlined.
*
* In general, no unmovable allocations that degrade memory offlining
* should end up in ZONE_MOVABLE. Allocators (like alloc_contig_range())
@@ -1383,10 +1397,8 @@ static inline int online_section_nr(unsigned long nr)
#ifdef CONFIG_MEMORY_HOTPLUG
void online_mem_sections(unsigned long start_pfn, unsigned long end_pfn);
-#ifdef CONFIG_MEMORY_HOTREMOVE
void offline_mem_sections(unsigned long start_pfn, unsigned long end_pfn);
#endif
-#endif
static inline struct mem_section *__pfn_to_section(unsigned long pfn)
{
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 469fa7ffcf96..a4bd41128bf3 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -18,6 +18,11 @@
struct pagevec;
+static inline bool mapping_empty(struct address_space *mapping)
+{
+ return xa_empty(&mapping->i_pages);
+}
+
/*
* Bits in mapping->flags.
*/
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index 5e772392a379..2194a9cd885c 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -1111,6 +1111,7 @@ extern void untrack_pfn(struct vm_area_struct *vma, unsigned long pfn,
extern void untrack_pfn_moved(struct vm_area_struct *vma);
#endif
+#ifdef CONFIG_MMU
#ifdef __HAVE_COLOR_ZERO_PAGE
static inline int is_zero_pfn(unsigned long pfn)
{
@@ -1134,6 +1135,17 @@ static inline unsigned long my_zero_pfn(unsigned long addr)
return zero_pfn;
}
#endif
+#else
+static inline int is_zero_pfn(unsigned long pfn)
+{
+ return 0;
+}
+
+static inline unsigned long my_zero_pfn(unsigned long addr)
+{
+ return 0;
+}
+#endif /* CONFIG_MMU */
#ifdef CONFIG_MMU
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 9c25c8e67030..d2c881384517 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1583,7 +1583,7 @@ extern struct pid *cad_pid;
#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
#define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_mask */
#define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
-#define PF_MEMALLOC_NOCMA 0x10000000 /* All allocation request will have _GFP_MOVABLE cleared */
+#define PF_MEMALLOC_PIN 0x10000000 /* Allocation context constrained to zones which allow long term pinning. */
#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
#define PF_SUSPEND_TASK 0x80000000 /* This thread called freeze_processes() and should not be frozen */
diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h
index 90b2a0bce11c..e24b1fe348e3 100644
--- a/include/linux/sched/mm.h
+++ b/include/linux/sched/mm.h
@@ -151,12 +151,13 @@ static inline bool in_vfork(struct task_struct *tsk)
* Applies per-task gfp context to the given allocation flags.
* PF_MEMALLOC_NOIO implies GFP_NOIO
* PF_MEMALLOC_NOFS implies GFP_NOFS
+ * PF_MEMALLOC_PIN implies !GFP_MOVABLE
*/
static inline gfp_t current_gfp_context(gfp_t flags)
{
unsigned int pflags = READ_ONCE(current->flags);
- if (unlikely(pflags & (PF_MEMALLOC_NOIO | PF_MEMALLOC_NOFS))) {
+ if (unlikely(pflags & (PF_MEMALLOC_NOIO | PF_MEMALLOC_NOFS | PF_MEMALLOC_PIN))) {
/*
* NOIO implies both NOIO and NOFS and it is a weaker context
* so always make sure it makes precedence
@@ -165,6 +166,9 @@ static inline gfp_t current_gfp_context(gfp_t flags)
flags &= ~(__GFP_IO | __GFP_FS);
else if (pflags & PF_MEMALLOC_NOFS)
flags &= ~__GFP_FS;
+
+ if (pflags & PF_MEMALLOC_PIN)
+ flags &= ~__GFP_MOVABLE;
}
return flags;
}
@@ -271,29 +275,18 @@ static inline void memalloc_noreclaim_restore(unsigned int flags)
current->flags = (current->flags & ~PF_MEMALLOC) | flags;
}
-#ifdef CONFIG_CMA
-static inline unsigned int memalloc_nocma_save(void)
+static inline unsigned int memalloc_pin_save(void)
{
- unsigned int flags = current->flags & PF_MEMALLOC_NOCMA;
+ unsigned int flags = current->flags & PF_MEMALLOC_PIN;
- current->flags |= PF_MEMALLOC_NOCMA;
+ current->flags |= PF_MEMALLOC_PIN;
return flags;
}
-static inline void memalloc_nocma_restore(unsigned int flags)
-{
- current->flags = (current->flags & ~PF_MEMALLOC_NOCMA) | flags;
-}
-#else
-static inline unsigned int memalloc_nocma_save(void)
-{
- return 0;
-}
-
-static inline void memalloc_nocma_restore(unsigned int flags)
+static inline void memalloc_pin_restore(unsigned int flags)
{
+ current->flags = (current->flags & ~PF_MEMALLOC_PIN) | flags;
}
-#endif
#ifdef CONFIG_MEMCG
DECLARE_PER_CPU(struct mem_cgroup *, int_active_memcg);
diff --git a/include/linux/shrinker.h b/include/linux/shrinker.h
index 0f80123650e2..1eac79ce57d4 100644
--- a/include/linux/shrinker.h
+++ b/include/linux/shrinker.h
@@ -79,13 +79,14 @@ struct shrinker {
#define DEFAULT_SEEKS 2 /* A good number if you don't know better. */
/* Flags */
-#define SHRINKER_NUMA_AWARE (1 << 0)
-#define SHRINKER_MEMCG_AWARE (1 << 1)
+#define SHRINKER_REGISTERED (1 << 0)
+#define SHRINKER_NUMA_AWARE (1 << 1)
+#define SHRINKER_MEMCG_AWARE (1 << 2)
/*
* It just makes sense when the shrinker is also MEMCG_AWARE for now,
* non-MEMCG_AWARE shrinker should not have this flag set.
*/
-#define SHRINKER_NONSLAB (1 << 2)
+#define SHRINKER_NONSLAB (1 << 3)
extern int prealloc_shrinker(struct shrinker *shrinker);
extern void register_shrinker_prepared(struct shrinker *shrinker);
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 4cc6ec3bf0ab..f69e0f67651d 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -12,6 +12,7 @@
#include <linux/fs.h>
#include <linux/atomic.h>
#include <linux/page-flags.h>
+#include <uapi/linux/mempolicy.h>
#include <asm/page.h>
struct notifier_block;
@@ -339,6 +340,20 @@ extern void lru_note_cost(struct lruvec *lruvec, bool file,
extern void lru_note_cost_page(struct page *);
extern void lru_cache_add(struct page *);
extern void mark_page_accessed(struct page *);
+
+extern atomic_t lru_disable_count;
+
+static inline bool lru_cache_disabled(void)
+{
+ return atomic_read(&lru_disable_count);
+}
+
+static inline void lru_cache_enable(void)
+{
+ atomic_dec(&lru_disable_count);
+}
+
+extern void lru_cache_disable(void);
extern void lru_add_drain(void);
extern void lru_add_drain_cpu(int cpu);
extern void lru_add_drain_cpu_zone(struct zone *zone);
@@ -378,6 +393,12 @@ extern int sysctl_min_slab_ratio;
#define node_reclaim_mode 0
#endif
+static inline bool node_reclaim_enabled(void)
+{
+ /* Is any node_reclaim_mode bit set? */
+ return node_reclaim_mode & (RECLAIM_ZONE|RECLAIM_WRITE|RECLAIM_UNMAP);
+}
+
extern void check_move_unevictable_pages(struct pagevec *pvec);
extern int kswapd_run(int nid);
diff --git a/include/linux/userfaultfd_k.h b/include/linux/userfaultfd_k.h
index a8e5f3ea9bb2..794d1538b8ba 100644
--- a/include/linux/userfaultfd_k.h
+++ b/include/linux/userfaultfd_k.h
@@ -17,6 +17,9 @@
#include <linux/mm.h>
#include <asm-generic/pgtable_uffd.h>
+/* The set of all possible UFFD-related VM flags. */
+#define __VM_UFFD_FLAGS (VM_UFFD_MISSING | VM_UFFD_WP | VM_UFFD_MINOR)
+
/*
* CAREFUL: Check include/uapi/asm-generic/fcntl.h when defining
* new flags, since they might collide with O_* ones. We want
@@ -34,6 +37,22 @@ extern int sysctl_unprivileged_userfaultfd;
extern vm_fault_t handle_userfault(struct vm_fault *vmf, unsigned long reason);
+/*
+ * The mode of operation for __mcopy_atomic and its helpers.
+ *
+ * This is almost an implementation detail (mcopy_atomic below doesn't take this
+ * as a parameter), but it's exposed here because memory-kind-specific
+ * implementations (e.g. hugetlbfs) need to know the mode of operation.
+ */
+enum mcopy_atomic_mode {
+ /* A normal copy_from_user into the destination range. */
+ MCOPY_ATOMIC_NORMAL,
+ /* Don't copy; map the destination range to the zero page. */
+ MCOPY_ATOMIC_ZEROPAGE,
+ /* Just install pte(s) with the existing page(s) in the page cache. */
+ MCOPY_ATOMIC_CONTINUE,
+};
+
extern ssize_t mcopy_atomic(struct mm_struct *dst_mm, unsigned long dst_start,
unsigned long src_start, unsigned long len,
bool *mmap_changing, __u64 mode);
@@ -41,6 +60,8 @@ extern ssize_t mfill_zeropage(struct mm_struct *dst_mm,
unsigned long dst_start,
unsigned long len,
bool *mmap_changing);
+extern ssize_t mcopy_continue(struct mm_struct *dst_mm, unsigned long dst_start,
+ unsigned long len, bool *mmap_changing);
extern int mwriteprotect_range(struct mm_struct *dst_mm,
unsigned long start, unsigned long len,
bool enable_wp, bool *mmap_changing);
@@ -52,6 +73,22 @@ static inline bool is_mergeable_vm_userfaultfd_ctx(struct vm_area_struct *vma,
return vma->vm_userfaultfd_ctx.ctx == vm_ctx.ctx;
}
+/*
+ * Never enable huge pmd sharing on some uffd registered vmas:
+ *
+ * - VM_UFFD_WP VMAs, because write protect information is per pgtable entry.
+ *
+ * - VM_UFFD_MINOR VMAs, because otherwise we would never get minor faults for
+ * VMAs which share huge pmds. (If you have two mappings to the same
+ * underlying pages, and fault in the non-UFFD-registered one with a write,
+ * with huge pmd sharing this would *also* setup the second UFFD-registered
+ * mapping, and we'd not get minor faults.)
+ */
+static inline bool uffd_disable_huge_pmd_share(struct vm_area_struct *vma)
+{
+ return vma->vm_flags & (VM_UFFD_WP | VM_UFFD_MINOR);
+}
+
static inline bool userfaultfd_missing(struct vm_area_struct *vma)
{
return vma->vm_flags & VM_UFFD_MISSING;
@@ -62,6 +99,11 @@ static inline bool userfaultfd_wp(struct vm_area_struct *vma)
return vma->vm_flags & VM_UFFD_WP;
}
+static inline bool userfaultfd_minor(struct vm_area_struct *vma)
+{
+ return vma->vm_flags & VM_UFFD_MINOR;
+}
+
static inline bool userfaultfd_pte_wp(struct vm_area_struct *vma,
pte_t pte)
{
@@ -76,7 +118,7 @@ static inline bool userfaultfd_huge_pmd_wp(struct vm_area_struct *vma,
static inline bool userfaultfd_armed(struct vm_area_struct *vma)
{
- return vma->vm_flags & (VM_UFFD_MISSING | VM_UFFD_WP);
+ return vma->vm_flags & __VM_UFFD_FLAGS;
}
extern int dup_userfaultfd(struct vm_area_struct *, struct list_head *);
@@ -123,6 +165,11 @@ static inline bool userfaultfd_wp(struct vm_area_struct *vma)
return false;
}
+static inline bool userfaultfd_minor(struct vm_area_struct *vma)
+{
+ return false;
+}
+
static inline bool userfaultfd_pte_wp(struct vm_area_struct *vma,
pte_t pte)
{
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index 18e75974d4e3..ae0dd1948c2b 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -71,6 +71,10 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
#ifdef CONFIG_HUGETLB_PAGE
HTLB_BUDDY_PGALLOC, HTLB_BUDDY_PGALLOC_FAIL,
#endif
+#ifdef CONFIG_CMA
+ CMA_ALLOC_SUCCESS,
+ CMA_ALLOC_FAIL,
+#endif
UNEVICTABLE_PGCULLED, /* culled to noreclaim list */
UNEVICTABLE_PGSCANNED, /* scanned for reclaimability */
UNEVICTABLE_PGRESCUED, /* rescued from noreclaim list */
@@ -121,6 +125,10 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
SWAP_RA,
SWAP_RA_HIT,
#endif
+#ifdef CONFIG_X86
+ DIRECT_MAP_LEVEL2_SPLIT,
+ DIRECT_MAP_LEVEL3_SPLIT,
+#endif
NR_VM_EVENT_ITEMS
};
diff --git a/include/trace/events/cma.h b/include/trace/events/cma.h
index 5017a8829270..c3d354702cb0 100644
--- a/include/trace/events/cma.h
+++ b/include/trace/events/cma.h
@@ -8,28 +8,31 @@
#include <linux/types.h>
#include <linux/tracepoint.h>
-TRACE_EVENT(cma_alloc,
+DECLARE_EVENT_CLASS(cma_alloc_class,
- TP_PROTO(unsigned long pfn, const struct page *page,
- unsigned int count, unsigned int align),
+ TP_PROTO(const char *name, unsigned long pfn, const struct page *page,
+ unsigned long count, unsigned int align),
- TP_ARGS(pfn, page, count, align),
+ TP_ARGS(name, pfn, page, count, align),
TP_STRUCT__entry(
+ __string(name, name)
__field(unsigned long, pfn)
__field(const struct page *, page)
- __field(unsigned int, count)
+ __field(unsigned long, count)
__field(unsigned int, align)
),
TP_fast_assign(
+ __assign_str(name, name);
__entry->pfn = pfn;
__entry->page = page;
__entry->count = count;
__entry->align = align;
),
- TP_printk("pfn=%lx page=%p count=%u align=%u",
+ TP_printk("name=%s pfn=%lx page=%p count=%lu align=%u",
+ __get_str(name),
__entry->pfn,
__entry->page,
__entry->count,
@@ -38,29 +41,72 @@ TRACE_EVENT(cma_alloc,
TRACE_EVENT(cma_release,
- TP_PROTO(unsigned long pfn, const struct page *page,
- unsigned int count),
+ TP_PROTO(const char *name, unsigned long pfn, const struct page *page,
+ unsigned long count),
- TP_ARGS(pfn, page, count),
+ TP_ARGS(name, pfn, page, count),
TP_STRUCT__entry(
+ __string(name, name)
__field(unsigned long, pfn)
__field(const struct page *, page)
- __field(unsigned int, count)
+ __field(unsigned long, count)
),
TP_fast_assign(
+ __assign_str(name, name);
__entry->pfn = pfn;
__entry->page = page;
__entry->count = count;
),
- TP_printk("pfn=%lx page=%p count=%u",
+ TP_printk("name=%s pfn=%lx page=%p count=%lu",
+ __get_str(name),
__entry->pfn,
__entry->page,
__entry->count)
);
+TRACE_EVENT(cma_alloc_start,
+
+ TP_PROTO(const char *name, unsigned long count, unsigned int align),
+
+ TP_ARGS(name, count, align),
+
+ TP_STRUCT__entry(
+ __string(name, name)
+ __field(unsigned long, count)
+ __field(unsigned int, align)
+ ),
+
+ TP_fast_assign(
+ __assign_str(name, name);
+ __entry->count = count;
+ __entry->align = align;
+ ),
+
+ TP_printk("name=%s count=%lu align=%u",
+ __get_str(name),
+ __entry->count,
+ __entry->align)
+);
+
+DEFINE_EVENT(cma_alloc_class, cma_alloc_finish,
+
+ TP_PROTO(const char *name, unsigned long pfn, const struct page *page,
+ unsigned long count, unsigned int align),
+
+ TP_ARGS(name, pfn, page, count, align)
+);
+
+DEFINE_EVENT(cma_alloc_class, cma_alloc_busy_retry,
+
+ TP_PROTO(const char *name, unsigned long pfn, const struct page *page,
+ unsigned long count, unsigned int align),
+
+ TP_ARGS(name, pfn, page, count, align)
+);
+
#endif /* _TRACE_CMA_H */
/* This part must be outside protection */
diff --git a/include/trace/events/migrate.h b/include/trace/events/migrate.h
index 4d434398d64d..9fb2a3bbcdfb 100644
--- a/include/trace/events/migrate.h
+++ b/include/trace/events/migrate.h
@@ -20,7 +20,8 @@
EM( MR_SYSCALL, "syscall_or_cpuset") \
EM( MR_MEMPOLICY_MBIND, "mempolicy_mbind") \
EM( MR_NUMA_MISPLACED, "numa_misplaced") \
- EMe(MR_CONTIG_RANGE, "contig_range")
+ EM( MR_CONTIG_RANGE, "contig_range") \
+ EMe(MR_LONGTERM_PIN, "longterm_pin")
/*
* First define the enums in the above macros to be exported to userspace
@@ -81,6 +82,28 @@ TRACE_EVENT(mm_migrate_pages,
__print_symbolic(__entry->mode, MIGRATE_MODE),
__print_symbolic(__entry->reason, MIGRATE_REASON))
);
+
+TRACE_EVENT(mm_migrate_pages_start,
+
+ TP_PROTO(enum migrate_mode mode, int reason),
+
+ TP_ARGS(mode, reason),
+
+ TP_STRUCT__entry(
+ __field(enum migrate_mode, mode)
+ __field(int, reason)
+ ),
+
+ TP_fast_assign(
+ __entry->mode = mode;
+ __entry->reason = reason;
+ ),
+
+ TP_printk("mode=%s reason=%s",
+ __print_symbolic(__entry->mode, MIGRATE_MODE),
+ __print_symbolic(__entry->reason, MIGRATE_REASON))
+);
+
#endif /* _TRACE_MIGRATE_H */
/* This part must be outside protection */
diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h
index 67018d367b9f..629c7a0eaff2 100644
--- a/include/trace/events/mmflags.h
+++ b/include/trace/events/mmflags.h
@@ -137,6 +137,12 @@ IF_HAVE_PG_ARCH_2(PG_arch_2, "arch_2" )
#define IF_HAVE_VM_SOFTDIRTY(flag,name)
#endif
+#ifdef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR
+# define IF_HAVE_UFFD_MINOR(flag, name) {flag, name},
+#else
+# define IF_HAVE_UFFD_MINOR(flag, name)
+#endif
+
#define __def_vmaflag_names \
{VM_READ, "read" }, \
{VM_WRITE, "write" }, \
@@ -148,6 +154,7 @@ IF_HAVE_PG_ARCH_2(PG_arch_2, "arch_2" )
{VM_MAYSHARE, "mayshare" }, \
{VM_GROWSDOWN, "growsdown" }, \
{VM_UFFD_MISSING, "uffd_missing" }, \
+IF_HAVE_UFFD_MINOR(VM_UFFD_MINOR, "uffd_minor" ) \
{VM_PFNMAP, "pfnmap" }, \
{VM_DENYWRITE, "denywrite" }, \
{VM_UFFD_WP, "uffd_wp" }, \
diff --git a/include/uapi/linux/mempolicy.h b/include/uapi/linux/mempolicy.h
index 8948467b3992..4832fd0b5642 100644
--- a/include/uapi/linux/mempolicy.h
+++ b/include/uapi/linux/mempolicy.h
@@ -64,5 +64,12 @@ enum {
#define MPOL_F_MOF (1 << 3) /* this policy wants migrate on fault */
#define MPOL_F_MORON (1 << 4) /* Migrate On protnone Reference On Node */
+/*
+ * These bit locations are exposed in the vm.zone_reclaim_mode sysctl
+ * ABI. New bits are OK, but existing bits can never change.
+ */
+#define RECLAIM_ZONE (1<<0) /* Run shrink_inactive_list on the zone */
+#define RECLAIM_WRITE (1<<1) /* Writeout pages during reclaim */
+#define RECLAIM_UNMAP (1<<2) /* Unmap pages during reclaim */
#endif /* _UAPI_LINUX_MEMPOLICY_H */
diff --git a/include/uapi/linux/userfaultfd.h b/include/uapi/linux/userfaultfd.h
index 5f2d88212f7c..bafbeb1a2624 100644
--- a/include/uapi/linux/userfaultfd.h
+++ b/include/uapi/linux/userfaultfd.h
@@ -19,15 +19,19 @@
* means the userland is reading).
*/
#define UFFD_API ((__u64)0xAA)
+#define UFFD_API_REGISTER_MODES (UFFDIO_REGISTER_MODE_MISSING | \
+ UFFDIO_REGISTER_MODE_WP | \
+ UFFDIO_REGISTER_MODE_MINOR)
#define UFFD_API_FEATURES (UFFD_FEATURE_PAGEFAULT_FLAG_WP | \
UFFD_FEATURE_EVENT_FORK | \
UFFD_FEATURE_EVENT_REMAP | \
- UFFD_FEATURE_EVENT_REMOVE | \
+ UFFD_FEATURE_EVENT_REMOVE | \
UFFD_FEATURE_EVENT_UNMAP | \
UFFD_FEATURE_MISSING_HUGETLBFS | \
UFFD_FEATURE_MISSING_SHMEM | \
UFFD_FEATURE_SIGBUS | \
- UFFD_FEATURE_THREAD_ID)
+ UFFD_FEATURE_THREAD_ID | \
+ UFFD_FEATURE_MINOR_HUGETLBFS)
#define UFFD_API_IOCTLS \
((__u64)1 << _UFFDIO_REGISTER | \
(__u64)1 << _UFFDIO_UNREGISTER | \
@@ -36,10 +40,12 @@
((__u64)1 << _UFFDIO_WAKE | \
(__u64)1 << _UFFDIO_COPY | \
(__u64)1 << _UFFDIO_ZEROPAGE | \
- (__u64)1 << _UFFDIO_WRITEPROTECT)
+ (__u64)1 << _UFFDIO_WRITEPROTECT | \
+ (__u64)1 << _UFFDIO_CONTINUE)
#define UFFD_API_RANGE_IOCTLS_BASIC \
((__u64)1 << _UFFDIO_WAKE | \
- (__u64)1 << _UFFDIO_COPY)
+ (__u64)1 << _UFFDIO_COPY | \
+ (__u64)1 << _UFFDIO_CONTINUE)
/*
* Valid ioctl command number range with this API is from 0x00 to
@@ -55,6 +61,7 @@
#define _UFFDIO_COPY (0x03)
#define _UFFDIO_ZEROPAGE (0x04)
#define _UFFDIO_WRITEPROTECT (0x06)
+#define _UFFDIO_CONTINUE (0x07)
#define _UFFDIO_API (0x3F)
/* userfaultfd ioctl ids */
@@ -73,6 +80,8 @@
struct uffdio_zeropage)
#define UFFDIO_WRITEPROTECT _IOWR(UFFDIO, _UFFDIO_WRITEPROTECT, \
struct uffdio_writeprotect)
+#define UFFDIO_CONTINUE _IOR(UFFDIO, _UFFDIO_CONTINUE, \
+ struct uffdio_continue)
/* read() structure */
struct uffd_msg {
@@ -127,6 +136,7 @@ struct uffd_msg {
/* flags for UFFD_EVENT_PAGEFAULT */
#define UFFD_PAGEFAULT_FLAG_WRITE (1<<0) /* If this was a write fault */
#define UFFD_PAGEFAULT_FLAG_WP (1<<1) /* If reason is VM_UFFD_WP */
+#define UFFD_PAGEFAULT_FLAG_MINOR (1<<2) /* If reason is VM_UFFD_MINOR */
struct uffdio_api {
/* userland asks for an API number and the features to enable */
@@ -171,6 +181,10 @@ struct uffdio_api {
*
* UFFD_FEATURE_THREAD_ID pid of the page faulted task_struct will
* be returned, if feature is not requested 0 will be returned.
+ *
+ * UFFD_FEATURE_MINOR_HUGETLBFS indicates that minor faults
+ * can be intercepted (via REGISTER_MODE_MINOR) for
+ * hugetlbfs-backed pages.
*/
#define UFFD_FEATURE_PAGEFAULT_FLAG_WP (1<<0)
#define UFFD_FEATURE_EVENT_FORK (1<<1)
@@ -181,6 +195,7 @@ struct uffdio_api {
#define UFFD_FEATURE_EVENT_UNMAP (1<<6)
#define UFFD_FEATURE_SIGBUS (1<<7)
#define UFFD_FEATURE_THREAD_ID (1<<8)
+#define UFFD_FEATURE_MINOR_HUGETLBFS (1<<9)
__u64 features;
__u64 ioctls;
@@ -195,6 +210,7 @@ struct uffdio_register {
struct uffdio_range range;
#define UFFDIO_REGISTER_MODE_MISSING ((__u64)1<<0)
#define UFFDIO_REGISTER_MODE_WP ((__u64)1<<1)
+#define UFFDIO_REGISTER_MODE_MINOR ((__u64)1<<2)
__u64 mode;
/*
@@ -257,6 +273,18 @@ struct uffdio_writeprotect {
__u64 mode;
};
+struct uffdio_continue {
+ struct uffdio_range range;
+#define UFFDIO_CONTINUE_MODE_DONTWAKE ((__u64)1<<0)
+ __u64 mode;
+
+ /*
+ * Fields below here are written by the ioctl and must be at the end:
+ * the copy_from_user will not read past here.
+ */
+ __s64 mapped;
+};
+
/*
* Flags for the userfaultfd(2) system call itself.
*/
diff --git a/init/Kconfig b/init/Kconfig
index b71bf0cf5688..b1da957a9549 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1644,6 +1644,11 @@ config HAVE_ARCH_USERFAULTFD_WP
help
Arch has userfaultfd write protection support
+config HAVE_ARCH_USERFAULTFD_MINOR
+ bool
+ help
+ Arch has userfaultfd minor fault support
+
config MEMBARRIER
bool "Enable membarrier() system call" if EXPERT
default y
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index f91d327273c1..14edf84cc571 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2830,7 +2830,7 @@ static struct ctl_table vm_table[] = {
#ifdef CONFIG_COMPACTION
{
.procname = "compact_memory",
- .data = &sysctl_compact_memory,
+ .data = NULL,
.maxlen = sizeof(int),
.mode = 0200,
.proc_handler = sysctl_compaction_handler,
diff --git a/lib/Kconfig.kfence b/lib/Kconfig.kfence
index 78f50ccb3b45..e641add33947 100644
--- a/lib/Kconfig.kfence
+++ b/lib/Kconfig.kfence
@@ -7,6 +7,7 @@ menuconfig KFENCE
bool "KFENCE: low-overhead sampling-based memory safety error detector"
depends on HAVE_ARCH_KFENCE && (SLAB || SLUB)
select STACKTRACE
+ select IRQ_WORK
help
KFENCE is a low-overhead sampling-based detector of heap out-of-bounds
access, use-after-free, and invalid-free errors. KFENCE is designed
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 61228a6c69f8..c701b7a187f2 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -5,6 +5,7 @@
#include <linux/fault-inject-usercopy.h>
#include <linux/uio.h>
#include <linux/pagemap.h>
+#include <linux/highmem.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/splice.h>
@@ -507,13 +508,6 @@ void iov_iter_init(struct iov_iter *i, unsigned int direction,
}
EXPORT_SYMBOL(iov_iter_init);
-static void memzero_page(struct page *page, size_t offset, size_t len)
-{
- char *addr = kmap_atomic(page);
- memset(addr + offset, 0, len);
- kunmap_atomic(addr);
-}
-
static inline bool allocated(struct pipe_buffer *buf)
{
return buf->ops == &default_pipe_buf_ops;
diff --git a/mm/Kconfig b/mm/Kconfig
index 3636da27c385..02d44e3420f5 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -148,6 +148,9 @@ config MEMORY_ISOLATION
config HAVE_BOOTMEM_INFO_NODE
def_bool n
+config ARCH_ENABLE_MEMORY_HOTPLUG
+ bool
+
# eventually, we can have this option just 'select SPARSEMEM'
config MEMORY_HOTPLUG
bool "Allow for memory hot-add"
@@ -176,12 +179,20 @@ config MEMORY_HOTPLUG_DEFAULT_ONLINE
Say N here if you want the default policy to keep all hot-plugged
memory blocks in 'offline' state.
+config ARCH_ENABLE_MEMORY_HOTREMOVE
+ bool
+
config MEMORY_HOTREMOVE
bool "Allow for memory hot remove"
select HAVE_BOOTMEM_INFO_NODE if (X86_64 || PPC64)
depends on MEMORY_HOTPLUG && ARCH_ENABLE_MEMORY_HOTREMOVE
depends on MIGRATION
+config MHP_MEMMAP_ON_MEMORY
+ def_bool y
+ depends on MEMORY_HOTPLUG && SPARSEMEM_VMEMMAP
+ depends on ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
+
# Heavily threaded applications may benefit from splitting the mm-wide
# page_table_lock, so that faults on different parts of the user address
# space can be handled with less contention: split it at this NR_CPUS.
@@ -273,6 +284,13 @@ config ARCH_ENABLE_HUGEPAGE_MIGRATION
config ARCH_ENABLE_THP_MIGRATION
bool
+config HUGETLB_PAGE_SIZE_VARIABLE
+ def_bool n
+ help
+ Allows the pageblock_order value to be dynamic instead of just standard
+ HUGETLB_PAGE_ORDER when there are multiple HugeTLB page sizes available
+ on a platform.
+
config CONTIG_ALLOC
def_bool (MEMORY_ISOLATION && COMPACTION) || CMA
@@ -511,6 +529,13 @@ config CMA_DEBUGFS
help
Turns on the DebugFS interface for CMA.
+config CMA_SYSFS
+ bool "CMA information through sysfs interface"
+ depends on CMA && SYSFS
+ help
+ This option exposes some sysfs attributes to get information
+ from CMA.
+
config CMA_AREAS
int "Maximum count of the CMA areas"
depends on CMA
@@ -758,6 +783,9 @@ config IDLE_PAGE_TRACKING
See Documentation/admin-guide/mm/idle_page_tracking.rst for
more details.
+config ARCH_HAS_CACHE_LINE_SIZE
+ bool
+
config ARCH_HAS_PTE_DEVMAP
bool
diff --git a/mm/Makefile b/mm/Makefile
index c0135e385984..bf71e295e9f6 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -58,9 +58,13 @@ obj-y := filemap.o mempool.o oom_kill.o fadvise.o \
page-alloc-y := page_alloc.o
page-alloc-$(CONFIG_SHUFFLE_PAGE_ALLOCATOR) += shuffle.o
+# Give 'memory_hotplug' its own module-parameter namespace
+memory-hotplug-$(CONFIG_MEMORY_HOTPLUG) += memory_hotplug.o
+
obj-y += page-alloc.o
obj-y += init-mm.o
obj-y += memblock.o
+obj-y += $(memory-hotplug-y)
ifdef CONFIG_MMU
obj-$(CONFIG_ADVISE_SYSCALLS) += madvise.o
@@ -83,7 +87,6 @@ obj-$(CONFIG_SLUB) += slub.o
obj-$(CONFIG_KASAN) += kasan/
obj-$(CONFIG_KFENCE) += kfence/
obj-$(CONFIG_FAILSLAB) += failslab.o
-obj-$(CONFIG_MEMORY_HOTPLUG) += memory_hotplug.o
obj-$(CONFIG_MEMTEST) += memtest.o
obj-$(CONFIG_MIGRATION) += migrate.o
obj-$(CONFIG_TRANSPARENT_HUGEPAGE) += huge_memory.o khugepaged.o
@@ -109,6 +112,7 @@ obj-$(CONFIG_CMA) += cma.o
obj-$(CONFIG_MEMORY_BALLOON) += balloon_compaction.o
obj-$(CONFIG_PAGE_EXTENSION) += page_ext.o
obj-$(CONFIG_CMA_DEBUGFS) += cma_debug.o
+obj-$(CONFIG_CMA_SYSFS) += cma_sysfs.o
obj-$(CONFIG_USERFAULTFD) += userfaultfd.o
obj-$(CONFIG_IDLE_PAGE_TRACKING) += page_idle.o
obj-$(CONFIG_DEBUG_PAGE_REF) += debug_page_ref.o
diff --git a/mm/cma.c b/mm/cma.c
index 54eee2119822..995e15480937 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -24,7 +24,6 @@
#include <linux/memblock.h>
#include <linux/err.h>
#include <linux/mm.h>
-#include <linux/mutex.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/log2.h>
@@ -80,16 +79,17 @@ static unsigned long cma_bitmap_pages_to_bits(const struct cma *cma,
}
static void cma_clear_bitmap(struct cma *cma, unsigned long pfn,
- unsigned int count)
+ unsigned long count)
{
unsigned long bitmap_no, bitmap_count;
+ unsigned long flags;
bitmap_no = (pfn - cma->base_pfn) >> cma->order_per_bit;
bitmap_count = cma_bitmap_pages_to_bits(cma, count);
- mutex_lock(&cma->lock);
+ spin_lock_irqsave(&cma->lock, flags);
bitmap_clear(cma->bitmap, bitmap_no, bitmap_count);
- mutex_unlock(&cma->lock);
+ spin_unlock_irqrestore(&cma->lock, flags);
}
static void __init cma_activate_area(struct cma *cma)
@@ -118,7 +118,7 @@ static void __init cma_activate_area(struct cma *cma)
pfn += pageblock_nr_pages)
init_cma_reserved_pageblock(pfn_to_page(pfn));
- mutex_init(&cma->lock);
+ spin_lock_init(&cma->lock);
#ifdef CONFIG_CMA_DEBUGFS
INIT_HLIST_HEAD(&cma->mem_head);
@@ -392,7 +392,7 @@ static void cma_debug_show_areas(struct cma *cma)
unsigned long nr_part, nr_total = 0;
unsigned long nbits = cma_bitmap_maxno(cma);
- mutex_lock(&cma->lock);
+ spin_lock_irq(&cma->lock);
pr_info("number of available pages: ");
for (;;) {
next_zero_bit = find_next_zero_bit(cma->bitmap, nbits, start);
@@ -407,7 +407,7 @@ static void cma_debug_show_areas(struct cma *cma)
start = next_zero_bit + nr_zero;
}
pr_cont("=> %lu free of %lu total pages\n", nr_total, cma->count);
- mutex_unlock(&cma->lock);
+ spin_unlock_irq(&cma->lock);
}
#else
static inline void cma_debug_show_areas(struct cma *cma) { }
@@ -423,25 +423,27 @@ static inline void cma_debug_show_areas(struct cma *cma) { }
* This function allocates part of contiguous memory on specific
* contiguous memory area.
*/
-struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
- bool no_warn)
+struct page *cma_alloc(struct cma *cma, unsigned long count,
+ unsigned int align, bool no_warn)
{
unsigned long mask, offset;
unsigned long pfn = -1;
unsigned long start = 0;
unsigned long bitmap_maxno, bitmap_no, bitmap_count;
- size_t i;
+ unsigned long i;
struct page *page = NULL;
int ret = -ENOMEM;
if (!cma || !cma->count || !cma->bitmap)
- return NULL;
+ goto out;
- pr_debug("%s(cma %p, count %zu, align %d)\n", __func__, (void *)cma,
+ pr_debug("%s(cma %p, count %lu, align %d)\n", __func__, (void *)cma,
count, align);
if (!count)
- return NULL;
+ goto out;
+
+ trace_cma_alloc_start(cma->name, count, align);
mask = cma_bitmap_aligned_mask(cma, align);
offset = cma_bitmap_aligned_offset(cma, align);
@@ -449,15 +451,15 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
bitmap_count = cma_bitmap_pages_to_bits(cma, count);
if (bitmap_count > bitmap_maxno)
- return NULL;
+ goto out;
for (;;) {
- mutex_lock(&cma->lock);
+ spin_lock_irq(&cma->lock);
bitmap_no = bitmap_find_next_zero_area_off(cma->bitmap,
bitmap_maxno, start, bitmap_count, mask,
offset);
if (bitmap_no >= bitmap_maxno) {
- mutex_unlock(&cma->lock);
+ spin_unlock_irq(&cma->lock);
break;
}
bitmap_set(cma->bitmap, bitmap_no, bitmap_count);
@@ -466,7 +468,7 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
* our exclusive use. If the migration fails we will take the
* lock again and unmark it.
*/
- mutex_unlock(&cma->lock);
+ spin_unlock_irq(&cma->lock);
pfn = cma->base_pfn + (bitmap_no << cma->order_per_bit);
ret = alloc_contig_range(pfn, pfn + count, MIGRATE_CMA,
@@ -483,11 +485,14 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
pr_debug("%s(): memory range at %p is busy, retrying\n",
__func__, pfn_to_page(pfn));
+
+ trace_cma_alloc_busy_retry(cma->name, pfn, pfn_to_page(pfn),
+ count, align);
/* try again with a bit different memory target */
start = bitmap_no + mask + 1;
}
- trace_cma_alloc(pfn, page, count, align);
+ trace_cma_alloc_finish(cma->name, pfn, page, count, align);
/*
* CMA can allocate multiple page blocks, which results in different
@@ -500,12 +505,22 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
}
if (ret && !no_warn) {
- pr_err("%s: %s: alloc failed, req-size: %zu pages, ret: %d\n",
- __func__, cma->name, count, ret);
+ pr_err_ratelimited("%s: %s: alloc failed, req-size: %lu pages, ret: %d\n",
+ __func__, cma->name, count, ret);
cma_debug_show_areas(cma);
}
pr_debug("%s(): returned %p\n", __func__, page);
+out:
+ if (page) {
+ count_vm_event(CMA_ALLOC_SUCCESS);
+ cma_sysfs_account_success_pages(cma, count);
+ } else {
+ count_vm_event(CMA_ALLOC_FAIL);
+ if (cma)
+ cma_sysfs_account_fail_pages(cma, count);
+ }
+
return page;
}
@@ -519,14 +534,15 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
* It returns false when provided pages do not belong to contiguous area and
* true otherwise.
*/
-bool cma_release(struct cma *cma, const struct page *pages, unsigned int count)
+bool cma_release(struct cma *cma, const struct page *pages,
+ unsigned long count)
{
unsigned long pfn;
if (!cma || !pages)
return false;
- pr_debug("%s(page %p, count %u)\n", __func__, (void *)pages, count);
+ pr_debug("%s(page %p, count %lu)\n", __func__, (void *)pages, count);
pfn = page_to_pfn(pages);
@@ -537,7 +553,7 @@ bool cma_release(struct cma *cma, const struct page *pages, unsigned int count)
free_contig_range(pfn, count);
cma_clear_bitmap(cma, pfn, count);
- trace_cma_release(pfn, pages, count);
+ trace_cma_release(cma->name, pfn, pages, count);
return true;
}
diff --git a/mm/cma.h b/mm/cma.h
index 42ae082cb067..2c775877eae2 100644
--- a/mm/cma.h
+++ b/mm/cma.h
@@ -3,19 +3,33 @@
#define __MM_CMA_H__
#include <linux/debugfs.h>
+#include <linux/kobject.h>
+
+struct cma_kobject {
+ struct kobject kobj;
+ struct cma *cma;
+};
struct cma {
unsigned long base_pfn;
unsigned long count;
unsigned long *bitmap;
unsigned int order_per_bit; /* Order of pages represented by one bit */
- struct mutex lock;
+ spinlock_t lock;
#ifdef CONFIG_CMA_DEBUGFS
struct hlist_head mem_head;
spinlock_t mem_head_lock;
struct debugfs_u32_array dfs_bitmap;
#endif
char name[CMA_MAX_NAME];
+#ifdef CONFIG_CMA_SYSFS
+ /* the number of CMA page successful allocations */
+ atomic64_t nr_pages_succeeded;
+ /* the number of CMA page allocation failures */
+ atomic64_t nr_pages_failed;
+ /* kobject requires dynamic object */
+ struct cma_kobject *cma_kobj;
+#endif
};
extern struct cma cma_areas[MAX_CMA_AREAS];
@@ -26,4 +40,13 @@ static inline unsigned long cma_bitmap_maxno(struct cma *cma)
return cma->count >> cma->order_per_bit;
}
+#ifdef CONFIG_CMA_SYSFS
+void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages);
+void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages);
+#else
+static inline void cma_sysfs_account_success_pages(struct cma *cma,
+ unsigned long nr_pages) {};
+static inline void cma_sysfs_account_fail_pages(struct cma *cma,
+ unsigned long nr_pages) {};
+#endif
#endif
diff --git a/mm/cma_debug.c b/mm/cma_debug.c
index d5bf8aa34fdc..2e7704955f4f 100644
--- a/mm/cma_debug.c
+++ b/mm/cma_debug.c
@@ -36,10 +36,10 @@ static int cma_used_get(void *data, u64 *val)
struct cma *cma = data;
unsigned long used;
- mutex_lock(&cma->lock);
+ spin_lock_irq(&cma->lock);
/* pages counter is smaller than sizeof(int) */
used = bitmap_weight(cma->bitmap, (int)cma_bitmap_maxno(cma));
- mutex_unlock(&cma->lock);
+ spin_unlock_irq(&cma->lock);
*val = (u64)used << cma->order_per_bit;
return 0;
@@ -53,7 +53,7 @@ static int cma_maxchunk_get(void *data, u64 *val)
unsigned long start, end = 0;
unsigned long bitmap_maxno = cma_bitmap_maxno(cma);
- mutex_lock(&cma->lock);
+ spin_lock_irq(&cma->lock);
for (;;) {
start = find_next_zero_bit(cma->bitmap, bitmap_maxno, end);
if (start >= bitmap_maxno)
@@ -61,7 +61,7 @@ static int cma_maxchunk_get(void *data, u64 *val)
end = find_next_bit(cma->bitmap, bitmap_maxno, start);
maxchunk = max(end - start, maxchunk);
}
- mutex_unlock(&cma->lock);
+ spin_unlock_irq(&cma->lock);
*val = (u64)maxchunk << cma->order_per_bit;
return 0;
diff --git a/mm/cma_sysfs.c b/mm/cma_sysfs.c
new file mode 100644
index 000000000000..eb2f39caff59
--- /dev/null
+++ b/mm/cma_sysfs.c
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * CMA SysFS Interface
+ *
+ * Copyright (c) 2021 Minchan Kim <minchan@kernel.org>
+ */
+
+#include <linux/cma.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+
+#include "cma.h"
+
+#define CMA_ATTR_RO(_name) \
+ static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
+
+void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages)
+{
+ atomic64_add(nr_pages, &cma->nr_pages_succeeded);
+}
+
+void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages)
+{
+ atomic64_add(nr_pages, &cma->nr_pages_failed);
+}
+
+static inline struct cma *cma_from_kobj(struct kobject *kobj)
+{
+ return container_of(kobj, struct cma_kobject, kobj)->cma;
+}
+
+static ssize_t alloc_pages_success_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct cma *cma = cma_from_kobj(kobj);
+
+ return sysfs_emit(buf, "%llu\n",
+ atomic64_read(&cma->nr_pages_succeeded));
+}
+CMA_ATTR_RO(alloc_pages_success);
+
+static ssize_t alloc_pages_fail_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct cma *cma = cma_from_kobj(kobj);
+
+ return sysfs_emit(buf, "%llu\n", atomic64_read(&cma->nr_pages_failed));
+}
+CMA_ATTR_RO(alloc_pages_fail);
+
+static void cma_kobj_release(struct kobject *kobj)
+{
+ struct cma *cma = cma_from_kobj(kobj);
+ struct cma_kobject *cma_kobj = cma->cma_kobj;
+
+ kfree(cma_kobj);
+ cma->cma_kobj = NULL;
+}
+
+static struct attribute *cma_attrs[] = {
+ &alloc_pages_success_attr.attr,
+ &alloc_pages_fail_attr.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(cma);
+
+static struct kobj_type cma_ktype = {
+ .release = cma_kobj_release,
+ .sysfs_ops = &kobj_sysfs_ops,
+ .default_groups = cma_groups,
+};
+
+static int __init cma_sysfs_init(void)
+{
+ struct kobject *cma_kobj_root;
+ struct cma_kobject *cma_kobj;
+ struct cma *cma;
+ int i, err;
+
+ cma_kobj_root = kobject_create_and_add("cma", mm_kobj);
+ if (!cma_kobj_root)
+ return -ENOMEM;
+
+ for (i = 0; i < cma_area_count; i++) {
+ cma_kobj = kzalloc(sizeof(*cma_kobj), GFP_KERNEL);
+ if (!cma_kobj) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ cma = &cma_areas[i];
+ cma->cma_kobj = cma_kobj;
+ cma_kobj->cma = cma;
+ err = kobject_init_and_add(&cma_kobj->kobj, &cma_ktype,
+ cma_kobj_root, "%s", cma->name);
+ if (err) {
+ kobject_put(&cma_kobj->kobj);
+ goto out;
+ }
+ }
+
+ return 0;
+out:
+ while (--i >= 0) {
+ cma = &cma_areas[i];
+ kobject_put(&cma->cma_kobj->kobj);
+ }
+ kobject_put(cma_kobj_root);
+
+ return err;
+}
+subsys_initcall(cma_sysfs_init);
diff --git a/mm/compaction.c b/mm/compaction.c
index e04f4476e68e..3a6c6b821f80 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -787,15 +787,14 @@ static bool too_many_isolated(pg_data_t *pgdat)
*
* Isolate all pages that can be migrated from the range specified by
* [low_pfn, end_pfn). The range is expected to be within same pageblock.
- * Returns zero if there is a fatal signal pending, otherwise PFN of the
- * first page that was not scanned (which may be both less, equal to or more
- * than end_pfn).
+ * Returns errno, like -EAGAIN or -EINTR in case e.g signal pending or congestion,
+ * -ENOMEM in case we could not allocate a page, or 0.
+ * cc->migrate_pfn will contain the next pfn to scan.
*
* The pages are isolated on cc->migratepages list (not required to be empty),
- * and cc->nr_migratepages is updated accordingly. The cc->migrate_pfn field
- * is neither read nor updated.
+ * and cc->nr_migratepages is updated accordingly.
*/
-static unsigned long
+static int
isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
unsigned long end_pfn, isolate_mode_t isolate_mode)
{
@@ -809,6 +808,9 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
bool skip_on_failure = false;
unsigned long next_skip_pfn = 0;
bool skip_updated = false;
+ int ret = 0;
+
+ cc->migrate_pfn = low_pfn;
/*
* Ensure that there are not too many pages isolated from the LRU
@@ -818,16 +820,16 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
while (unlikely(too_many_isolated(pgdat))) {
/* stop isolation if there are still pages not migrated */
if (cc->nr_migratepages)
- return 0;
+ return -EAGAIN;
/* async migration should just abort */
if (cc->mode == MIGRATE_ASYNC)
- return 0;
+ return -EAGAIN;
congestion_wait(BLK_RW_ASYNC, HZ/10);
if (fatal_signal_pending(current))
- return 0;
+ return -EINTR;
}
cond_resched();
@@ -875,8 +877,8 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
if (fatal_signal_pending(current)) {
cc->contended = true;
+ ret = -EINTR;
- low_pfn = 0;
goto fatal_pending;
}
@@ -904,6 +906,38 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
valid_page = page;
}
+ if (PageHuge(page) && cc->alloc_contig) {
+ ret = isolate_or_dissolve_huge_page(page, &cc->migratepages);
+
+ /*
+ * Fail isolation in case isolate_or_dissolve_huge_page()
+ * reports an error. In case of -ENOMEM, abort right away.
+ */
+ if (ret < 0) {
+ /* Do not report -EBUSY down the chain */
+ if (ret == -EBUSY)
+ ret = 0;
+ low_pfn += (1UL << compound_order(page)) - 1;
+ goto isolate_fail;
+ }
+
+ if (PageHuge(page)) {
+ /*
+ * Hugepage was successfully isolated and placed
+ * on the cc->migratepages list.
+ */
+ low_pfn += compound_nr(page) - 1;
+ goto isolate_success_no_list;
+ }
+
+ /*
+ * Ok, the hugepage was dissolved. Now these pages are
+ * Buddy and cannot be re-allocated because they are
+ * isolated. Fall-through as the check below handles
+ * Buddy pages.
+ */
+ }
+
/*
* Skip if free. We read page order here without zone lock
* which is generally unsafe, but the race window is small and
@@ -1037,6 +1071,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
isolate_success:
list_add(&page->lru, &cc->migratepages);
+isolate_success_no_list:
cc->nr_migratepages += compound_nr(page);
nr_isolated += compound_nr(page);
@@ -1063,7 +1098,7 @@ isolate_fail_put:
put_page(page);
isolate_fail:
- if (!skip_on_failure)
+ if (!skip_on_failure && ret != -ENOMEM)
continue;
/*
@@ -1089,6 +1124,9 @@ isolate_fail:
*/
next_skip_pfn += 1UL << cc->order;
}
+
+ if (ret == -ENOMEM)
+ break;
}
/*
@@ -1130,7 +1168,9 @@ fatal_pending:
if (nr_isolated)
count_compact_events(COMPACTISOLATED, nr_isolated);
- return low_pfn;
+ cc->migrate_pfn = low_pfn;
+
+ return ret;
}
/**
@@ -1139,15 +1179,15 @@ fatal_pending:
* @start_pfn: The first PFN to start isolating.
* @end_pfn: The one-past-last PFN.
*
- * Returns zero if isolation fails fatally due to e.g. pending signal.
- * Otherwise, function returns one-past-the-last PFN of isolated page
- * (which may be greater than end_pfn if end fell in a middle of a THP page).
+ * Returns -EAGAIN when contented, -EINTR in case of a signal pending, -ENOMEM
+ * in case we could not allocate a page, or 0.
*/
-unsigned long
+int
isolate_migratepages_range(struct compact_control *cc, unsigned long start_pfn,
unsigned long end_pfn)
{
unsigned long pfn, block_start_pfn, block_end_pfn;
+ int ret = 0;
/* Scan block by block. First and last block may be incomplete */
pfn = start_pfn;
@@ -1166,17 +1206,17 @@ isolate_migratepages_range(struct compact_control *cc, unsigned long start_pfn,
block_end_pfn, cc->zone))
continue;
- pfn = isolate_migratepages_block(cc, pfn, block_end_pfn,
- ISOLATE_UNEVICTABLE);
+ ret = isolate_migratepages_block(cc, pfn, block_end_pfn,
+ ISOLATE_UNEVICTABLE);
- if (!pfn)
+ if (ret)
break;
if (cc->nr_migratepages >= COMPACT_CLUSTER_MAX)
break;
}
- return pfn;
+ return ret;
}
#endif /* CONFIG_COMPACTION || CONFIG_CMA */
@@ -1847,7 +1887,7 @@ static isolate_migrate_t isolate_migratepages(struct compact_control *cc)
*/
for (; block_end_pfn <= cc->free_pfn;
fast_find_block = false,
- low_pfn = block_end_pfn,
+ cc->migrate_pfn = low_pfn = block_end_pfn,
block_start_pfn = block_end_pfn,
block_end_pfn += pageblock_nr_pages) {
@@ -1889,10 +1929,8 @@ static isolate_migrate_t isolate_migratepages(struct compact_control *cc)
}
/* Perform the isolation */
- low_pfn = isolate_migratepages_block(cc, low_pfn,
- block_end_pfn, isolate_mode);
-
- if (!low_pfn)
+ if (isolate_migratepages_block(cc, low_pfn, block_end_pfn,
+ isolate_mode))
return ISOLATE_ABORT;
/*
@@ -1903,9 +1941,6 @@ static isolate_migrate_t isolate_migratepages(struct compact_control *cc)
break;
}
- /* Record where migration scanner will be restarted. */
- cc->migrate_pfn = low_pfn;
-
return cc->nr_migratepages ? ISOLATE_SUCCESS : ISOLATE_NONE;
}
@@ -2319,7 +2354,8 @@ compact_zone(struct compact_control *cc, struct capture_control *capc)
trace_mm_compaction_begin(start_pfn, cc->migrate_pfn,
cc->free_pfn, end_pfn, sync);
- migrate_prep_local();
+ /* lru_add_drain_all could be expensive with involving other CPUs */
+ lru_add_drain();
while ((ret = compact_finished(cc)) == COMPACT_CONTINUE) {
int err;
@@ -2494,6 +2530,14 @@ static enum compact_result compact_zone_order(struct zone *zone, int order,
*/
WRITE_ONCE(current->capture_control, NULL);
*capture = READ_ONCE(capc.page);
+ /*
+ * Technically, it is also possible that compaction is skipped but
+ * the page is still captured out of luck(IRQ came and freed the page).
+ * Returning COMPACT_SUCCESS in such cases helps in properly accounting
+ * the COMPACT[STALL|FAIL] when compaction is skipped.
+ */
+ if (*capture)
+ ret = COMPACT_SUCCESS;
return ret;
}
@@ -2657,9 +2701,6 @@ static void compact_nodes(void)
compact_node(nid);
}
-/* The written value is actually unused, all memory is compacted */
-int sysctl_compact_memory;
-
/*
* Tunable for proactive compaction. It determines how
* aggressively the kernel should compact memory in the
@@ -2844,7 +2885,7 @@ void wakeup_kcompactd(pg_data_t *pgdat, int order, int highest_zoneidx)
*/
static int kcompactd(void *p)
{
- pg_data_t *pgdat = (pg_data_t*)p;
+ pg_data_t *pgdat = (pg_data_t *)p;
struct task_struct *tsk = current;
unsigned int proactive_defer = 0;
diff --git a/mm/filemap.c b/mm/filemap.c
index 5be57ba01d33..7fadf211643c 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -142,17 +142,6 @@ static void page_cache_delete(struct address_space *mapping,
page->mapping = NULL;
/* Leave page->index set: truncation lookup relies upon it */
-
- if (shadow) {
- mapping->nrexceptional += nr;
- /*
- * Make sure the nrexceptional update is committed before
- * the nrpages update so that final truncate racing
- * with reclaim does not see both counters 0 at the
- * same time and miss a shadow entry.
- */
- smp_wmb();
- }
mapping->nrpages -= nr;
}
@@ -629,9 +618,6 @@ EXPORT_SYMBOL(filemap_fdatawait_keep_errors);
/* Returns true if writeback might be needed or already in progress. */
static bool mapping_needs_writeback(struct address_space *mapping)
{
- if (dax_mapping(mapping))
- return mapping->nrexceptional;
-
return mapping->nrpages;
}
@@ -925,8 +911,6 @@ noinline int __add_to_page_cache_locked(struct page *page,
if (xas_error(&xas))
goto unlock;
- if (old)
- mapping->nrexceptional--;
mapping->nrpages++;
/* hugetlb pages do not participate in page cache accounting */
@@ -3283,7 +3267,7 @@ const struct vm_operations_struct generic_file_vm_ops = {
/* This is used for a general mmap of a disk file */
-int generic_file_mmap(struct file * file, struct vm_area_struct * vma)
+int generic_file_mmap(struct file *file, struct vm_area_struct *vma)
{
struct address_space *mapping = file->f_mapping;
@@ -3308,11 +3292,11 @@ vm_fault_t filemap_page_mkwrite(struct vm_fault *vmf)
{
return VM_FAULT_SIGBUS;
}
-int generic_file_mmap(struct file * file, struct vm_area_struct * vma)
+int generic_file_mmap(struct file *file, struct vm_area_struct *vma)
{
return -ENOSYS;
}
-int generic_file_readonly_mmap(struct file * file, struct vm_area_struct * vma)
+int generic_file_readonly_mmap(struct file *file, struct vm_area_struct *vma)
{
return -ENOSYS;
}
@@ -3740,7 +3724,7 @@ EXPORT_SYMBOL(generic_perform_write);
ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
struct file *file = iocb->ki_filp;
- struct address_space * mapping = file->f_mapping;
+ struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
ssize_t written = 0;
ssize_t err;
diff --git a/mm/frontswap.c b/mm/frontswap.c
index 2183a56c7874..130e301c5ac0 100644
--- a/mm/frontswap.c
+++ b/mm/frontswap.c
@@ -60,16 +60,20 @@ static u64 frontswap_succ_stores;
static u64 frontswap_failed_stores;
static u64 frontswap_invalidates;
-static inline void inc_frontswap_loads(void) {
+static inline void inc_frontswap_loads(void)
+{
data_race(frontswap_loads++);
}
-static inline void inc_frontswap_succ_stores(void) {
+static inline void inc_frontswap_succ_stores(void)
+{
data_race(frontswap_succ_stores++);
}
-static inline void inc_frontswap_failed_stores(void) {
+static inline void inc_frontswap_failed_stores(void)
+{
data_race(frontswap_failed_stores++);
}
-static inline void inc_frontswap_invalidates(void) {
+static inline void inc_frontswap_invalidates(void)
+{
data_race(frontswap_invalidates++);
}
#else
diff --git a/mm/gup.c b/mm/gup.c
index 71e546e279fc..aa09535cf4d4 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -87,11 +87,12 @@ __maybe_unused struct page *try_grab_compound_head(struct page *page,
int orig_refs = refs;
/*
- * Can't do FOLL_LONGTERM + FOLL_PIN with CMA in the gup fast
- * path, so fail and let the caller fall back to the slow path.
+ * Can't do FOLL_LONGTERM + FOLL_PIN gup fast path if not in a
+ * right zone, so fail and let the caller fall back to the slow
+ * path.
*/
- if (unlikely(flags & FOLL_LONGTERM) &&
- is_migrate_cma_page(page))
+ if (unlikely((flags & FOLL_LONGTERM) &&
+ !is_pinnable_page(page)))
return NULL;
/*
@@ -1527,7 +1528,7 @@ static long __get_user_pages_locked(struct mm_struct *mm, unsigned long start,
{
struct vm_area_struct *vma;
unsigned long vm_flags;
- int i;
+ long i;
/* calculate required read or write permissions.
* If FOLL_FORCE is set, we only require the "MAY" flags.
@@ -1600,112 +1601,92 @@ struct page *get_dump_page(unsigned long addr)
}
#endif /* CONFIG_ELF_CORE */
-#ifdef CONFIG_CMA
-static long check_and_migrate_cma_pages(struct mm_struct *mm,
- unsigned long start,
- unsigned long nr_pages,
- struct page **pages,
- struct vm_area_struct **vmas,
- unsigned int gup_flags)
+#ifdef CONFIG_MIGRATION
+/*
+ * Check whether all pages are pinnable, if so return number of pages. If some
+ * pages are not pinnable, migrate them, and unpin all pages. Return zero if
+ * pages were migrated, or if some pages were not successfully isolated.
+ * Return negative error if migration fails.
+ */
+static long check_and_migrate_movable_pages(unsigned long nr_pages,
+ struct page **pages,
+ unsigned int gup_flags)
{
unsigned long i;
- unsigned long step;
+ unsigned long isolation_error_count = 0;
bool drain_allow = true;
- bool migrate_allow = true;
- LIST_HEAD(cma_page_list);
- long ret = nr_pages;
+ LIST_HEAD(movable_page_list);
+ long ret = 0;
+ struct page *prev_head = NULL;
+ struct page *head;
struct migration_target_control mtc = {
.nid = NUMA_NO_NODE,
- .gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_NOWARN,
+ .gfp_mask = GFP_USER | __GFP_NOWARN,
};
-check_again:
- for (i = 0; i < nr_pages;) {
-
- struct page *head = compound_head(pages[i]);
-
- /*
- * gup may start from a tail page. Advance step by the left
- * part.
- */
- step = compound_nr(head) - (pages[i] - head);
+ for (i = 0; i < nr_pages; i++) {
+ head = compound_head(pages[i]);
+ if (head == prev_head)
+ continue;
+ prev_head = head;
/*
- * If we get a page from the CMA zone, since we are going to
- * be pinning these entries, we might as well move them out
- * of the CMA zone if possible.
+ * If we get a movable page, since we are going to be pinning
+ * these entries, try to move them out if possible.
*/
- if (is_migrate_cma_page(head)) {
- if (PageHuge(head))
- isolate_huge_page(head, &cma_page_list);
- else {
+ if (!is_pinnable_page(head)) {
+ if (PageHuge(head)) {
+ if (!isolate_huge_page(head, &movable_page_list))
+ isolation_error_count++;
+ } else {
if (!PageLRU(head) && drain_allow) {
lru_add_drain_all();
drain_allow = false;
}
- if (!isolate_lru_page(head)) {
- list_add_tail(&head->lru, &cma_page_list);
- mod_node_page_state(page_pgdat(head),
- NR_ISOLATED_ANON +
- page_is_file_lru(head),
- thp_nr_pages(head));
+ if (isolate_lru_page(head)) {
+ isolation_error_count++;
+ continue;
}
+ list_add_tail(&head->lru, &movable_page_list);
+ mod_node_page_state(page_pgdat(head),
+ NR_ISOLATED_ANON +
+ page_is_file_lru(head),
+ thp_nr_pages(head));
}
}
-
- i += step;
}
- if (!list_empty(&cma_page_list)) {
- /*
- * drop the above get_user_pages reference.
- */
- if (gup_flags & FOLL_PIN)
- unpin_user_pages(pages, nr_pages);
- else
- for (i = 0; i < nr_pages; i++)
- put_page(pages[i]);
-
- if (migrate_pages(&cma_page_list, alloc_migration_target, NULL,
- (unsigned long)&mtc, MIGRATE_SYNC, MR_CONTIG_RANGE)) {
- /*
- * some of the pages failed migration. Do get_user_pages
- * without migration.
- */
- migrate_allow = false;
+ /*
+ * If list is empty, and no isolation errors, means that all pages are
+ * in the correct zone.
+ */
+ if (list_empty(&movable_page_list) && !isolation_error_count)
+ return nr_pages;
- if (!list_empty(&cma_page_list))
- putback_movable_pages(&cma_page_list);
- }
- /*
- * We did migrate all the pages, Try to get the page references
- * again migrating any new CMA pages which we failed to isolate
- * earlier.
- */
- ret = __get_user_pages_locked(mm, start, nr_pages,
- pages, vmas, NULL,
- gup_flags);
-
- if ((ret > 0) && migrate_allow) {
- nr_pages = ret;
- drain_allow = true;
- goto check_again;
- }
+ if (gup_flags & FOLL_PIN) {
+ unpin_user_pages(pages, nr_pages);
+ } else {
+ for (i = 0; i < nr_pages; i++)
+ put_page(pages[i]);
+ }
+ if (!list_empty(&movable_page_list)) {
+ ret = migrate_pages(&movable_page_list, alloc_migration_target,
+ NULL, (unsigned long)&mtc, MIGRATE_SYNC,
+ MR_LONGTERM_PIN);
+ if (ret && !list_empty(&movable_page_list))
+ putback_movable_pages(&movable_page_list);
}
- return ret;
+ return ret > 0 ? -ENOMEM : ret;
}
#else
-static long check_and_migrate_cma_pages(struct mm_struct *mm,
- unsigned long start,
- unsigned long nr_pages,
- struct page **pages,
- struct vm_area_struct **vmas,
- unsigned int gup_flags)
+static long check_and_migrate_movable_pages(unsigned long nr_pages,
+ struct page **pages,
+ unsigned int gup_flags)
{
return nr_pages;
}
-#endif /* CONFIG_CMA */
+#endif /* CONFIG_MIGRATION */
/*
* __gup_longterm_locked() is a wrapper for __get_user_pages_locked which
@@ -1718,21 +1699,22 @@ static long __gup_longterm_locked(struct mm_struct *mm,
struct vm_area_struct **vmas,
unsigned int gup_flags)
{
- unsigned long flags = 0;
+ unsigned int flags;
long rc;
- if (gup_flags & FOLL_LONGTERM)
- flags = memalloc_nocma_save();
-
- rc = __get_user_pages_locked(mm, start, nr_pages, pages, vmas, NULL,
- gup_flags);
+ if (!(gup_flags & FOLL_LONGTERM))
+ return __get_user_pages_locked(mm, start, nr_pages, pages, vmas,
+ NULL, gup_flags);
+ flags = memalloc_pin_save();
+ do {
+ rc = __get_user_pages_locked(mm, start, nr_pages, pages, vmas,
+ NULL, gup_flags);
+ if (rc <= 0)
+ break;
+ rc = check_and_migrate_movable_pages(rc, pages, gup_flags);
+ } while (!rc);
+ memalloc_pin_restore(flags);
- if (gup_flags & FOLL_LONGTERM) {
- if (rc > 0)
- rc = check_and_migrate_cma_pages(mm, start, rc, pages,
- vmas, gup_flags);
- memalloc_nocma_restore(flags);
- }
return rc;
}
diff --git a/mm/gup_test.c b/mm/gup_test.c
index e3cf78e5873e..d974dec19e1c 100644
--- a/mm/gup_test.c
+++ b/mm/gup_test.c
@@ -52,6 +52,12 @@ static void verify_dma_pinned(unsigned int cmd, struct page **pages,
dump_page(page, "gup_test failure");
break;
+ } else if (cmd == PIN_LONGTERM_BENCHMARK &&
+ WARN(!is_pinnable_page(page),
+ "pages[%lu] is NOT pinnable but pinned\n",
+ i)) {
+ dump_page(page, "gup_test failure");
+ break;
}
}
break;
@@ -94,7 +100,7 @@ static int __gup_test_ioctl(unsigned int cmd,
{
ktime_t start_time, end_time;
unsigned long i, nr_pages, addr, next;
- int nr;
+ long nr;
struct page **pages;
int ret = 0;
bool needs_mmap_lock =
@@ -126,37 +132,34 @@ static int __gup_test_ioctl(unsigned int cmd,
nr = (next - addr) / PAGE_SIZE;
}
- /* Filter out most gup flags: only allow a tiny subset here: */
- gup->flags &= FOLL_WRITE;
-
switch (cmd) {
case GUP_FAST_BENCHMARK:
- nr = get_user_pages_fast(addr, nr, gup->flags,
+ nr = get_user_pages_fast(addr, nr, gup->gup_flags,
pages + i);
break;
case GUP_BASIC_TEST:
- nr = get_user_pages(addr, nr, gup->flags, pages + i,
+ nr = get_user_pages(addr, nr, gup->gup_flags, pages + i,
NULL);
break;
case PIN_FAST_BENCHMARK:
- nr = pin_user_pages_fast(addr, nr, gup->flags,
+ nr = pin_user_pages_fast(addr, nr, gup->gup_flags,
pages + i);
break;
case PIN_BASIC_TEST:
- nr = pin_user_pages(addr, nr, gup->flags, pages + i,
+ nr = pin_user_pages(addr, nr, gup->gup_flags, pages + i,
NULL);
break;
case PIN_LONGTERM_BENCHMARK:
nr = pin_user_pages(addr, nr,
- gup->flags | FOLL_LONGTERM,
+ gup->gup_flags | FOLL_LONGTERM,
pages + i, NULL);
break;
case DUMP_USER_PAGES_TEST:
- if (gup->flags & GUP_TEST_FLAG_DUMP_PAGES_USE_PIN)
- nr = pin_user_pages(addr, nr, gup->flags,
+ if (gup->test_flags & GUP_TEST_FLAG_DUMP_PAGES_USE_PIN)
+ nr = pin_user_pages(addr, nr, gup->gup_flags,
pages + i, NULL);
else
- nr = get_user_pages(addr, nr, gup->flags,
+ nr = get_user_pages(addr, nr, gup->gup_flags,
pages + i, NULL);
break;
default:
@@ -187,7 +190,7 @@ static int __gup_test_ioctl(unsigned int cmd,
start_time = ktime_get();
- put_back_pages(cmd, pages, nr_pages, gup->flags);
+ put_back_pages(cmd, pages, nr_pages, gup->test_flags);
end_time = ktime_get();
gup->put_delta_usec = ktime_us_delta(end_time, start_time);
diff --git a/mm/gup_test.h b/mm/gup_test.h
index 90a6713d50eb..887ac1d5f5bc 100644
--- a/mm/gup_test.h
+++ b/mm/gup_test.h
@@ -21,7 +21,8 @@ struct gup_test {
__u64 addr;
__u64 size;
__u32 nr_pages_per_call;
- __u32 flags;
+ __u32 gup_flags;
+ __u32 test_flags;
/*
* Each non-zero entry is the number of the page (1-based: first page is
* page 1, so that zero entries mean "do nothing") from the .addr base.
diff --git a/mm/highmem.c b/mm/highmem.c
index 6ef8f5e05e7e..e389337e00b4 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -104,7 +104,7 @@ static inline wait_queue_head_t *get_pkmap_wait_queue_head(unsigned int color)
atomic_long_t _totalhigh_pages __read_mostly;
EXPORT_SYMBOL(_totalhigh_pages);
-unsigned int __nr_free_highpages (void)
+unsigned int __nr_free_highpages(void)
{
struct zone *zone;
unsigned int pages = 0;
@@ -120,7 +120,7 @@ unsigned int __nr_free_highpages (void)
static int pkmap_count[LAST_PKMAP];
static __cacheline_aligned_in_smp DEFINE_SPINLOCK(kmap_lock);
-pte_t * pkmap_page_table;
+pte_t *pkmap_page_table;
/*
* Most architectures have no use for kmap_high_get(), so let's abstract
@@ -147,6 +147,7 @@ struct page *__kmap_to_page(void *vaddr)
if (addr >= PKMAP_ADDR(0) && addr < PKMAP_ADDR(LAST_PKMAP)) {
int i = PKMAP_NR(addr);
+
return pte_page(pkmap_page_table[i]);
}
@@ -278,9 +279,8 @@ void *kmap_high(struct page *page)
pkmap_count[PKMAP_NR(vaddr)]++;
BUG_ON(pkmap_count[PKMAP_NR(vaddr)] < 2);
unlock_kmap();
- return (void*) vaddr;
+ return (void *) vaddr;
}
-
EXPORT_SYMBOL(kmap_high);
#ifdef ARCH_NEEDS_KMAP_HIGH_GET
@@ -305,7 +305,7 @@ void *kmap_high_get(struct page *page)
pkmap_count[PKMAP_NR(vaddr)]++;
}
unlock_kmap_any(flags);
- return (void*) vaddr;
+ return (void *) vaddr;
}
#endif
@@ -737,7 +737,6 @@ done:
spin_unlock_irqrestore(&pas->lock, flags);
return ret;
}
-
EXPORT_SYMBOL(page_address);
/**
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index ae907a9c2050..98456017744d 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -7,6 +7,7 @@
#include <linux/mm.h>
#include <linux/sched.h>
+#include <linux/sched/mm.h>
#include <linux/sched/coredump.h>
#include <linux/sched/numa_balancing.h>
#include <linux/highmem.h>
@@ -77,18 +78,18 @@ bool transparent_hugepage_enabled(struct vm_area_struct *vma)
return false;
}
-static struct page *get_huge_zero_page(void)
+static bool get_huge_zero_page(void)
{
struct page *zero_page;
retry:
if (likely(atomic_inc_not_zero(&huge_zero_refcount)))
- return READ_ONCE(huge_zero_page);
+ return true;
zero_page = alloc_pages((GFP_TRANSHUGE | __GFP_ZERO) & ~__GFP_MOVABLE,
HPAGE_PMD_ORDER);
if (!zero_page) {
count_vm_event(THP_ZERO_PAGE_ALLOC_FAILED);
- return NULL;
+ return false;
}
count_vm_event(THP_ZERO_PAGE_ALLOC);
preempt_disable();
@@ -101,7 +102,7 @@ retry:
/* We take additional reference here. It will be put back by shrinker */
atomic_set(&huge_zero_refcount, 2);
preempt_enable();
- return READ_ONCE(huge_zero_page);
+ return true;
}
static void put_huge_zero_page(void)
@@ -624,14 +625,12 @@ static vm_fault_t __do_huge_pmd_anonymous_page(struct vm_fault *vmf,
/* Deliver the page fault to userland */
if (userfaultfd_missing(vma)) {
- vm_fault_t ret2;
-
spin_unlock(vmf->ptl);
put_page(page);
pte_free(vma->vm_mm, pgtable);
- ret2 = handle_userfault(vmf, VM_UFFD_MISSING);
- VM_BUG_ON(ret2 & VM_FAULT_FALLBACK);
- return ret2;
+ ret = handle_userfault(vmf, VM_UFFD_MISSING);
+ VM_BUG_ON(ret & VM_FAULT_FALLBACK);
+ return ret;
}
entry = mk_huge_pmd(page, vma->vm_page_prot);
@@ -1293,7 +1292,7 @@ vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd)
}
page = pmd_page(orig_pmd);
- VM_BUG_ON_PAGE(!PageCompound(page) || !PageHead(page), page);
+ VM_BUG_ON_PAGE(!PageHead(page), page);
/* Lock page for reuse_swap_page() */
if (!trylock_page(page)) {
@@ -1464,12 +1463,6 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t pmd)
*/
page_locked = trylock_page(page);
target_nid = mpol_misplaced(page, vma, haddr);
- if (target_nid == NUMA_NO_NODE) {
- /* If the page was locked, there are no parallel migrations */
- if (page_locked)
- goto clear_pmdnuma;
- }
-
/* Migration could have started since the pmd_trans_migrating check */
if (!page_locked) {
page_nid = NUMA_NO_NODE;
@@ -1478,6 +1471,11 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t pmd)
spin_unlock(vmf->ptl);
put_and_wait_on_page_locked(page, TASK_UNINTERRUPTIBLE);
goto out;
+ } else if (target_nid == NUMA_NO_NODE) {
+ /* There are no parallel migrations and page is in the right
+ * node. Clear the numa hinting info in this pmd.
+ */
+ goto clear_pmdnuma;
}
/*
@@ -1696,7 +1694,7 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
VM_BUG_ON(!is_pmd_migration_entry(orig_pmd));
entry = pmd_to_swp_entry(orig_pmd);
- page = pfn_to_page(swp_offset(entry));
+ page = migration_entry_to_page(entry);
flush_needed = 0;
} else
WARN_ONCE(1, "Non present huge pmd without pmd migration enabled!");
@@ -2104,7 +2102,7 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd,
swp_entry_t entry;
entry = pmd_to_swp_entry(old_pmd);
- page = pfn_to_page(swp_offset(entry));
+ page = migration_entry_to_page(entry);
write = is_write_migration_entry(entry);
young = false;
soft_dirty = pmd_swp_soft_dirty(old_pmd);
@@ -2303,44 +2301,38 @@ void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
__split_huge_pmd(vma, pmd, address, freeze, page);
}
+static inline void split_huge_pmd_if_needed(struct vm_area_struct *vma, unsigned long address)
+{
+ /*
+ * If the new address isn't hpage aligned and it could previously
+ * contain an hugepage: check if we need to split an huge pmd.
+ */
+ if (!IS_ALIGNED(address, HPAGE_PMD_SIZE) &&
+ range_in_vma(vma, ALIGN_DOWN(address, HPAGE_PMD_SIZE),
+ ALIGN(address, HPAGE_PMD_SIZE)))
+ split_huge_pmd_address(vma, address, false, NULL);
+}
+
void vma_adjust_trans_huge(struct vm_area_struct *vma,
unsigned long start,
unsigned long end,
long adjust_next)
{
- /*
- * If the new start address isn't hpage aligned and it could
- * previously contain an hugepage: check if we need to split
- * an huge pmd.
- */
- if (start & ~HPAGE_PMD_MASK &&
- (start & HPAGE_PMD_MASK) >= vma->vm_start &&
- (start & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE <= vma->vm_end)
- split_huge_pmd_address(vma, start, false, NULL);
+ /* Check if we need to split start first. */
+ split_huge_pmd_if_needed(vma, start);
- /*
- * If the new end address isn't hpage aligned and it could
- * previously contain an hugepage: check if we need to split
- * an huge pmd.
- */
- if (end & ~HPAGE_PMD_MASK &&
- (end & HPAGE_PMD_MASK) >= vma->vm_start &&
- (end & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE <= vma->vm_end)
- split_huge_pmd_address(vma, end, false, NULL);
+ /* Check if we need to split end next. */
+ split_huge_pmd_if_needed(vma, end);
/*
- * If we're also updating the vma->vm_next->vm_start, if the new
- * vm_next->vm_start isn't hpage aligned and it could previously
- * contain an hugepage: check if we need to split an huge pmd.
+ * If we're also updating the vma->vm_next->vm_start,
+ * check if we need to split it.
*/
if (adjust_next > 0) {
struct vm_area_struct *next = vma->vm_next;
unsigned long nstart = next->vm_start;
nstart += adjust_next;
- if (nstart & ~HPAGE_PMD_MASK &&
- (nstart & HPAGE_PMD_MASK) >= next->vm_start &&
- (nstart & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE <= next->vm_end)
- split_huge_pmd_address(next, nstart, false, NULL);
+ split_huge_pmd_if_needed(next, nstart);
}
}
@@ -2838,8 +2830,8 @@ void deferred_split_huge_page(struct page *page)
ds_queue->split_queue_len++;
#ifdef CONFIG_MEMCG
if (memcg)
- memcg_set_shrinker_bit(memcg, page_to_nid(page),
- deferred_split_shrinker.id);
+ set_shrinker_bit(memcg, page_to_nid(page),
+ deferred_split_shrinker.id);
#endif
}
spin_unlock_irqrestore(&ds_queue->split_queue_lock, flags);
@@ -2924,16 +2916,14 @@ static struct shrinker deferred_split_shrinker = {
};
#ifdef CONFIG_DEBUG_FS
-static int split_huge_pages_set(void *data, u64 val)
+static void split_huge_pages_all(void)
{
struct zone *zone;
struct page *page;
unsigned long pfn, max_zone_pfn;
unsigned long total = 0, split = 0;
- if (val != 1)
- return -EINVAL;
-
+ pr_debug("Split all THPs\n");
for_each_populated_zone(zone) {
max_zone_pfn = zone_end_pfn(zone);
for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) {
@@ -2957,15 +2947,243 @@ static int split_huge_pages_set(void *data, u64 val)
unlock_page(page);
next:
put_page(page);
+ cond_resched();
}
}
- pr_info("%lu of %lu THP split\n", split, total);
+ pr_debug("%lu of %lu THP split\n", split, total);
+}
- return 0;
+static inline bool vma_not_suitable_for_thp_split(struct vm_area_struct *vma)
+{
+ return vma_is_special_huge(vma) || (vma->vm_flags & VM_IO) ||
+ is_vm_hugetlb_page(vma);
+}
+
+static int split_huge_pages_pid(int pid, unsigned long vaddr_start,
+ unsigned long vaddr_end)
+{
+ int ret = 0;
+ struct task_struct *task;
+ struct mm_struct *mm;
+ unsigned long total = 0, split = 0;
+ unsigned long addr;
+
+ vaddr_start &= PAGE_MASK;
+ vaddr_end &= PAGE_MASK;
+
+ /* Find the task_struct from pid */
+ rcu_read_lock();
+ task = find_task_by_vpid(pid);
+ if (!task) {
+ rcu_read_unlock();
+ ret = -ESRCH;
+ goto out;
+ }
+ get_task_struct(task);
+ rcu_read_unlock();
+
+ /* Find the mm_struct */
+ mm = get_task_mm(task);
+ put_task_struct(task);
+
+ if (!mm) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ pr_debug("Split huge pages in pid: %d, vaddr: [0x%lx - 0x%lx]\n",
+ pid, vaddr_start, vaddr_end);
+
+ mmap_read_lock(mm);
+ /*
+ * always increase addr by PAGE_SIZE, since we could have a PTE page
+ * table filled with PTE-mapped THPs, each of which is distinct.
+ */
+ for (addr = vaddr_start; addr < vaddr_end; addr += PAGE_SIZE) {
+ struct vm_area_struct *vma = find_vma(mm, addr);
+ unsigned int follflags;
+ struct page *page;
+
+ if (!vma || addr < vma->vm_start)
+ break;
+
+ /* skip special VMA and hugetlb VMA */
+ if (vma_not_suitable_for_thp_split(vma)) {
+ addr = vma->vm_end;
+ continue;
+ }
+
+ /* FOLL_DUMP to ignore special (like zero) pages */
+ follflags = FOLL_GET | FOLL_DUMP;
+ page = follow_page(vma, addr, follflags);
+
+ if (IS_ERR(page))
+ continue;
+ if (!page)
+ continue;
+
+ if (!is_transparent_hugepage(page))
+ goto next;
+
+ total++;
+ if (!can_split_huge_page(compound_head(page), NULL))
+ goto next;
+
+ if (!trylock_page(page))
+ goto next;
+
+ if (!split_huge_page(page))
+ split++;
+
+ unlock_page(page);
+next:
+ put_page(page);
+ cond_resched();
+ }
+ mmap_read_unlock(mm);
+ mmput(mm);
+
+ pr_debug("%lu of %lu THP split\n", split, total);
+
+out:
+ return ret;
+}
+
+static int split_huge_pages_in_file(const char *file_path, pgoff_t off_start,
+ pgoff_t off_end)
+{
+ struct filename *file;
+ struct file *candidate;
+ struct address_space *mapping;
+ int ret = -EINVAL;
+ pgoff_t index;
+ int nr_pages = 1;
+ unsigned long total = 0, split = 0;
+
+ file = getname_kernel(file_path);
+ if (IS_ERR(file))
+ return ret;
+
+ candidate = file_open_name(file, O_RDONLY, 0);
+ if (IS_ERR(candidate))
+ goto out;
+
+ pr_debug("split file-backed THPs in file: %s, page offset: [0x%lx - 0x%lx]\n",
+ file_path, off_start, off_end);
+
+ mapping = candidate->f_mapping;
+
+ for (index = off_start; index < off_end; index += nr_pages) {
+ struct page *fpage = pagecache_get_page(mapping, index,
+ FGP_ENTRY | FGP_HEAD, 0);
+
+ nr_pages = 1;
+ if (xa_is_value(fpage) || !fpage)
+ continue;
+
+ if (!is_transparent_hugepage(fpage))
+ goto next;
+
+ total++;
+ nr_pages = thp_nr_pages(fpage);
+
+ if (!trylock_page(fpage))
+ goto next;
+
+ if (!split_huge_page(fpage))
+ split++;
+
+ unlock_page(fpage);
+next:
+ put_page(fpage);
+ cond_resched();
+ }
+
+ filp_close(candidate, NULL);
+ ret = 0;
+
+ pr_debug("%lu of %lu file-backed THP split\n", split, total);
+out:
+ putname(file);
+ return ret;
}
-DEFINE_DEBUGFS_ATTRIBUTE(split_huge_pages_fops, NULL, split_huge_pages_set,
- "%llu\n");
+
+#define MAX_INPUT_BUF_SZ 255
+
+static ssize_t split_huge_pages_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppops)
+{
+ static DEFINE_MUTEX(split_debug_mutex);
+ ssize_t ret;
+ /* hold pid, start_vaddr, end_vaddr or file_path, off_start, off_end */
+ char input_buf[MAX_INPUT_BUF_SZ];
+ int pid;
+ unsigned long vaddr_start, vaddr_end;
+
+ ret = mutex_lock_interruptible(&split_debug_mutex);
+ if (ret)
+ return ret;
+
+ ret = -EFAULT;
+
+ memset(input_buf, 0, MAX_INPUT_BUF_SZ);
+ if (copy_from_user(input_buf, buf, min_t(size_t, count, MAX_INPUT_BUF_SZ)))
+ goto out;
+
+ input_buf[MAX_INPUT_BUF_SZ - 1] = '\0';
+
+ if (input_buf[0] == '/') {
+ char *tok;
+ char *buf = input_buf;
+ char file_path[MAX_INPUT_BUF_SZ];
+ pgoff_t off_start = 0, off_end = 0;
+ size_t input_len = strlen(input_buf);
+
+ tok = strsep(&buf, ",");
+ if (tok) {
+ strncpy(file_path, tok, MAX_INPUT_BUF_SZ);
+ } else {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = sscanf(buf, "0x%lx,0x%lx", &off_start, &off_end);
+ if (ret != 2) {
+ ret = -EINVAL;
+ goto out;
+ }
+ ret = split_huge_pages_in_file(file_path, off_start, off_end);
+ if (!ret)
+ ret = input_len;
+
+ goto out;
+ }
+
+ ret = sscanf(input_buf, "%d,0x%lx,0x%lx", &pid, &vaddr_start, &vaddr_end);
+ if (ret == 1 && pid == 1) {
+ split_huge_pages_all();
+ ret = strlen(input_buf);
+ goto out;
+ } else if (ret != 3) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = split_huge_pages_pid(pid, vaddr_start, vaddr_end);
+ if (!ret)
+ ret = strlen(input_buf);
+out:
+ mutex_unlock(&split_debug_mutex);
+ return ret;
+
+}
+
+static const struct file_operations split_huge_pages_fops = {
+ .owner = THIS_MODULE,
+ .write = split_huge_pages_write,
+ .llseek = no_llseek,
+};
static int __init split_huge_pages_debugfs(void)
{
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 6c72433bec1e..629aa4c2259c 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -39,7 +39,6 @@
#include <linux/hugetlb.h>
#include <linux/hugetlb_cgroup.h>
#include <linux/node.h>
-#include <linux/userfaultfd_k.h>
#include <linux/page_owner.h>
#include "internal.h"
@@ -94,9 +93,10 @@ static inline bool subpool_is_free(struct hugepage_subpool *spool)
return true;
}
-static inline void unlock_or_release_subpool(struct hugepage_subpool *spool)
+static inline void unlock_or_release_subpool(struct hugepage_subpool *spool,
+ unsigned long irq_flags)
{
- spin_unlock(&spool->lock);
+ spin_unlock_irqrestore(&spool->lock, irq_flags);
/* If no pages are used, and no other handles to the subpool
* remain, give up any reservations based on minimum size and
@@ -135,10 +135,12 @@ struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
void hugepage_put_subpool(struct hugepage_subpool *spool)
{
- spin_lock(&spool->lock);
+ unsigned long flags;
+
+ spin_lock_irqsave(&spool->lock, flags);
BUG_ON(!spool->count);
spool->count--;
- unlock_or_release_subpool(spool);
+ unlock_or_release_subpool(spool, flags);
}
/*
@@ -157,7 +159,7 @@ static long hugepage_subpool_get_pages(struct hugepage_subpool *spool,
if (!spool)
return ret;
- spin_lock(&spool->lock);
+ spin_lock_irq(&spool->lock);
if (spool->max_hpages != -1) { /* maximum size accounting */
if ((spool->used_hpages + delta) <= spool->max_hpages)
@@ -184,7 +186,7 @@ static long hugepage_subpool_get_pages(struct hugepage_subpool *spool,
}
unlock_ret:
- spin_unlock(&spool->lock);
+ spin_unlock_irq(&spool->lock);
return ret;
}
@@ -198,11 +200,12 @@ static long hugepage_subpool_put_pages(struct hugepage_subpool *spool,
long delta)
{
long ret = delta;
+ unsigned long flags;
if (!spool)
return delta;
- spin_lock(&spool->lock);
+ spin_lock_irqsave(&spool->lock, flags);
if (spool->max_hpages != -1) /* maximum size accounting */
spool->used_hpages -= delta;
@@ -223,7 +226,7 @@ static long hugepage_subpool_put_pages(struct hugepage_subpool *spool,
* If hugetlbfs_put_super couldn't free spool due to an outstanding
* quota reference, free it now.
*/
- unlock_or_release_subpool(spool);
+ unlock_or_release_subpool(spool, flags);
return ret;
}
@@ -553,7 +556,6 @@ retry:
resv->adds_in_progress -= in_regions_needed;
spin_unlock(&resv->lock);
- VM_BUG_ON(add < 0);
return add;
}
@@ -743,13 +745,20 @@ void hugetlb_fix_reserve_counts(struct inode *inode)
{
struct hugepage_subpool *spool = subpool_inode(inode);
long rsv_adjust;
+ bool reserved = false;
rsv_adjust = hugepage_subpool_get_pages(spool, 1);
- if (rsv_adjust) {
+ if (rsv_adjust > 0) {
struct hstate *h = hstate_inode(inode);
- hugetlb_acct_memory(h, 1);
+ if (!hugetlb_acct_memory(h, 1))
+ reserved = true;
+ } else if (!rsv_adjust) {
+ reserved = true;
}
+
+ if (!reserved)
+ pr_warn("hugetlb: Huge Page Reserved count may go negative.\n");
}
/*
@@ -1059,6 +1068,8 @@ static bool vma_has_reserves(struct vm_area_struct *vma, long chg)
static void enqueue_huge_page(struct hstate *h, struct page *page)
{
int nid = page_to_nid(page);
+
+ lockdep_assert_held(&hugetlb_lock);
list_move(&page->lru, &h->hugepage_freelists[nid]);
h->free_huge_pages++;
h->free_huge_pages_node[nid]++;
@@ -1068,10 +1079,11 @@ static void enqueue_huge_page(struct hstate *h, struct page *page)
static struct page *dequeue_huge_page_node_exact(struct hstate *h, int nid)
{
struct page *page;
- bool nocma = !!(current->flags & PF_MEMALLOC_NOCMA);
+ bool pin = !!(current->flags & PF_MEMALLOC_PIN);
+ lockdep_assert_held(&hugetlb_lock);
list_for_each_entry(page, &h->hugepage_freelists[nid], lru) {
- if (nocma && is_migrate_cma_page(page))
+ if (pin && !is_pinnable_page(page))
continue;
if (PageHWPoison(page))
@@ -1205,7 +1217,7 @@ static int hstate_next_node_to_alloc(struct hstate *h,
}
/*
- * helper for free_pool_huge_page() - return the previously saved
+ * helper for remove_pool_huge_page() - return the previously saved
* node ["this node"] from which to free a huge page. Advance the
* next node id whether or not we find a free huge page to free so
* that the next attempt to free addresses the next node.
@@ -1273,7 +1285,7 @@ static void free_gigantic_page(struct page *page, unsigned int order)
static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
int nid, nodemask_t *nodemask)
{
- unsigned long nr_pages = 1UL << huge_page_order(h);
+ unsigned long nr_pages = pages_per_huge_page(h);
if (nid == NUMA_NO_NODE)
nid = numa_mem_id();
@@ -1327,6 +1339,42 @@ static inline void destroy_compound_gigantic_page(struct page *page,
unsigned int order) { }
#endif
+/*
+ * Remove hugetlb page from lists, and update dtor so that page appears
+ * as just a compound page. A reference is held on the page.
+ *
+ * Must be called with hugetlb lock held.
+ */
+static void remove_hugetlb_page(struct hstate *h, struct page *page,
+ bool adjust_surplus)
+{
+ int nid = page_to_nid(page);
+
+ VM_BUG_ON_PAGE(hugetlb_cgroup_from_page(page), page);
+ VM_BUG_ON_PAGE(hugetlb_cgroup_from_page_rsvd(page), page);
+
+ lockdep_assert_held(&hugetlb_lock);
+ if (hstate_is_gigantic(h) && !gigantic_page_runtime_supported())
+ return;
+
+ list_del(&page->lru);
+
+ if (HPageFreed(page)) {
+ h->free_huge_pages--;
+ h->free_huge_pages_node[nid]--;
+ }
+ if (adjust_surplus) {
+ h->surplus_huge_pages--;
+ h->surplus_huge_pages_node[nid]--;
+ }
+
+ set_page_refcounted(page);
+ set_compound_page_dtor(page, NULL_COMPOUND_DTOR);
+
+ h->nr_huge_pages--;
+ h->nr_huge_pages_node[nid]--;
+}
+
static void update_and_free_page(struct hstate *h, struct page *page)
{
int i;
@@ -1335,8 +1383,6 @@ static void update_and_free_page(struct hstate *h, struct page *page)
if (hstate_is_gigantic(h) && !gigantic_page_runtime_supported())
return;
- h->nr_huge_pages--;
- h->nr_huge_pages_node[page_to_nid(page)]--;
for (i = 0; i < pages_per_huge_page(h);
i++, subpage = mem_map_next(subpage, page, i)) {
subpage->flags &= ~(1 << PG_locked | 1 << PG_error |
@@ -1344,24 +1390,24 @@ static void update_and_free_page(struct hstate *h, struct page *page)
1 << PG_active | 1 << PG_private |
1 << PG_writeback);
}
- VM_BUG_ON_PAGE(hugetlb_cgroup_from_page(page), page);
- VM_BUG_ON_PAGE(hugetlb_cgroup_from_page_rsvd(page), page);
- set_compound_page_dtor(page, NULL_COMPOUND_DTOR);
- set_page_refcounted(page);
if (hstate_is_gigantic(h)) {
- /*
- * Temporarily drop the hugetlb_lock, because
- * we might block in free_gigantic_page().
- */
- spin_unlock(&hugetlb_lock);
destroy_compound_gigantic_page(page, huge_page_order(h));
free_gigantic_page(page, huge_page_order(h));
- spin_lock(&hugetlb_lock);
} else {
__free_pages(page, huge_page_order(h));
}
}
+static void update_and_free_pages_bulk(struct hstate *h, struct list_head *list)
+{
+ struct page *page, *t_page;
+
+ list_for_each_entry_safe(page, t_page, list, lru) {
+ update_and_free_page(h, page);
+ cond_resched();
+ }
+}
+
struct hstate *size_to_hstate(unsigned long size)
{
struct hstate *h;
@@ -1373,7 +1419,7 @@ struct hstate *size_to_hstate(unsigned long size)
return NULL;
}
-static void __free_huge_page(struct page *page)
+void free_huge_page(struct page *page)
{
/*
* Can't pass hstate in here because it is called from the
@@ -1383,6 +1429,7 @@ static void __free_huge_page(struct page *page)
int nid = page_to_nid(page);
struct hugepage_subpool *spool = hugetlb_page_subpool(page);
bool restore_reserve;
+ unsigned long flags;
VM_BUG_ON_PAGE(page_count(page), page);
VM_BUG_ON_PAGE(page_mapcount(page), page);
@@ -1411,7 +1458,7 @@ static void __free_huge_page(struct page *page)
restore_reserve = true;
}
- spin_lock(&hugetlb_lock);
+ spin_lock_irqsave(&hugetlb_lock, flags);
ClearHPageMigratable(page);
hugetlb_cgroup_uncharge_page(hstate_index(h),
pages_per_huge_page(h), page);
@@ -1421,82 +1468,46 @@ static void __free_huge_page(struct page *page)
h->resv_huge_pages++;
if (HPageTemporary(page)) {
- list_del(&page->lru);
- ClearHPageTemporary(page);
+ remove_hugetlb_page(h, page, false);
+ spin_unlock_irqrestore(&hugetlb_lock, flags);
update_and_free_page(h, page);
} else if (h->surplus_huge_pages_node[nid]) {
/* remove the page from active list */
- list_del(&page->lru);
+ remove_hugetlb_page(h, page, true);
+ spin_unlock_irqrestore(&hugetlb_lock, flags);
update_and_free_page(h, page);
- h->surplus_huge_pages--;
- h->surplus_huge_pages_node[nid]--;
} else {
arch_clear_hugepage_flags(page);
enqueue_huge_page(h, page);
+ spin_unlock_irqrestore(&hugetlb_lock, flags);
}
- spin_unlock(&hugetlb_lock);
}
/*
- * As free_huge_page() can be called from a non-task context, we have
- * to defer the actual freeing in a workqueue to prevent potential
- * hugetlb_lock deadlock.
- *
- * free_hpage_workfn() locklessly retrieves the linked list of pages to
- * be freed and frees them one-by-one. As the page->mapping pointer is
- * going to be cleared in __free_huge_page() anyway, it is reused as the
- * llist_node structure of a lockless linked list of huge pages to be freed.
+ * Must be called with the hugetlb lock held
*/
-static LLIST_HEAD(hpage_freelist);
-
-static void free_hpage_workfn(struct work_struct *work)
+static void __prep_account_new_huge_page(struct hstate *h, int nid)
{
- struct llist_node *node;
- struct page *page;
-
- node = llist_del_all(&hpage_freelist);
-
- while (node) {
- page = container_of((struct address_space **)node,
- struct page, mapping);
- node = node->next;
- __free_huge_page(page);
- }
-}
-static DECLARE_WORK(free_hpage_work, free_hpage_workfn);
-
-void free_huge_page(struct page *page)
-{
- /*
- * Defer freeing if in non-task context to avoid hugetlb_lock deadlock.
- */
- if (!in_task()) {
- /*
- * Only call schedule_work() if hpage_freelist is previously
- * empty. Otherwise, schedule_work() had been called but the
- * workfn hasn't retrieved the list yet.
- */
- if (llist_add((struct llist_node *)&page->mapping,
- &hpage_freelist))
- schedule_work(&free_hpage_work);
- return;
- }
-
- __free_huge_page(page);
+ lockdep_assert_held(&hugetlb_lock);
+ h->nr_huge_pages++;
+ h->nr_huge_pages_node[nid]++;
}
-static void prep_new_huge_page(struct hstate *h, struct page *page, int nid)
+static void __prep_new_huge_page(struct page *page)
{
INIT_LIST_HEAD(&page->lru);
set_compound_page_dtor(page, HUGETLB_PAGE_DTOR);
hugetlb_set_page_subpool(page, NULL);
set_hugetlb_cgroup(page, NULL);
set_hugetlb_cgroup_rsvd(page, NULL);
- spin_lock(&hugetlb_lock);
- h->nr_huge_pages++;
- h->nr_huge_pages_node[nid]++;
- ClearHPageFreed(page);
- spin_unlock(&hugetlb_lock);
+}
+
+static void prep_new_huge_page(struct hstate *h, struct page *page, int nid)
+{
+ __prep_new_huge_page(page);
+ spin_lock_irq(&hugetlb_lock);
+ __prep_account_new_huge_page(h, nid);
+ spin_unlock_irq(&hugetlb_lock);
}
static void prep_compound_gigantic_page(struct page *page, unsigned int order)
@@ -1693,17 +1704,20 @@ static int alloc_pool_huge_page(struct hstate *h, nodemask_t *nodes_allowed,
}
/*
- * Free huge page from pool from next node to free.
- * Attempt to keep persistent huge pages more or less
- * balanced over allowed nodes.
+ * Remove huge page from pool from next node to free. Attempt to keep
+ * persistent huge pages more or less balanced over allowed nodes.
+ * This routine only 'removes' the hugetlb page. The caller must make
+ * an additional call to free the page to low level allocators.
* Called with hugetlb_lock locked.
*/
-static int free_pool_huge_page(struct hstate *h, nodemask_t *nodes_allowed,
- bool acct_surplus)
+static struct page *remove_pool_huge_page(struct hstate *h,
+ nodemask_t *nodes_allowed,
+ bool acct_surplus)
{
int nr_nodes, node;
- int ret = 0;
+ struct page *page = NULL;
+ lockdep_assert_held(&hugetlb_lock);
for_each_node_mask_to_free(h, nr_nodes, node, nodes_allowed) {
/*
* If we're returning unused surplus pages, only examine
@@ -1711,23 +1725,14 @@ static int free_pool_huge_page(struct hstate *h, nodemask_t *nodes_allowed,
*/
if ((!acct_surplus || h->surplus_huge_pages_node[node]) &&
!list_empty(&h->hugepage_freelists[node])) {
- struct page *page =
- list_entry(h->hugepage_freelists[node].next,
+ page = list_entry(h->hugepage_freelists[node].next,
struct page, lru);
- list_del(&page->lru);
- h->free_huge_pages--;
- h->free_huge_pages_node[node]--;
- if (acct_surplus) {
- h->surplus_huge_pages--;
- h->surplus_huge_pages_node[node]--;
- }
- update_and_free_page(h, page);
- ret = 1;
+ remove_hugetlb_page(h, page, acct_surplus);
break;
}
}
- return ret;
+ return page;
}
/*
@@ -1749,7 +1754,7 @@ retry:
if (!PageHuge(page))
return 0;
- spin_lock(&hugetlb_lock);
+ spin_lock_irq(&hugetlb_lock);
if (!PageHuge(page)) {
rc = 0;
goto out;
@@ -1758,7 +1763,6 @@ retry:
if (!page_count(page)) {
struct page *head = compound_head(page);
struct hstate *h = page_hstate(head);
- int nid = page_to_nid(head);
if (h->free_huge_pages - h->resv_huge_pages == 0)
goto out;
@@ -1767,7 +1771,7 @@ retry:
* when it is dissolved.
*/
if (unlikely(!HPageFreed(head))) {
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
cond_resched();
/*
@@ -1789,15 +1793,14 @@ retry:
SetPageHWPoison(page);
ClearPageHWPoison(head);
}
- list_del(&head->lru);
- h->free_huge_pages--;
- h->free_huge_pages_node[nid]--;
+ remove_hugetlb_page(h, page, false);
h->max_huge_pages--;
+ spin_unlock_irq(&hugetlb_lock);
update_and_free_page(h, head);
- rc = 0;
+ return 0;
}
out:
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
return rc;
}
@@ -1839,16 +1842,16 @@ static struct page *alloc_surplus_huge_page(struct hstate *h, gfp_t gfp_mask,
if (hstate_is_gigantic(h))
return NULL;
- spin_lock(&hugetlb_lock);
+ spin_lock_irq(&hugetlb_lock);
if (h->surplus_huge_pages >= h->nr_overcommit_huge_pages)
goto out_unlock;
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
page = alloc_fresh_huge_page(h, gfp_mask, nid, nmask, NULL);
if (!page)
return NULL;
- spin_lock(&hugetlb_lock);
+ spin_lock_irq(&hugetlb_lock);
/*
* We could have raced with the pool size change.
* Double check that and simply deallocate the new page
@@ -1858,7 +1861,7 @@ static struct page *alloc_surplus_huge_page(struct hstate *h, gfp_t gfp_mask,
*/
if (h->surplus_huge_pages >= h->nr_overcommit_huge_pages) {
SetHPageTemporary(page);
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
put_page(page);
return NULL;
} else {
@@ -1867,7 +1870,7 @@ static struct page *alloc_surplus_huge_page(struct hstate *h, gfp_t gfp_mask,
}
out_unlock:
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
return page;
}
@@ -1917,17 +1920,17 @@ struct page *alloc_buddy_huge_page_with_mpol(struct hstate *h,
struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
nodemask_t *nmask, gfp_t gfp_mask)
{
- spin_lock(&hugetlb_lock);
+ spin_lock_irq(&hugetlb_lock);
if (h->free_huge_pages - h->resv_huge_pages > 0) {
struct page *page;
page = dequeue_huge_page_nodemask(h, gfp_mask, preferred_nid, nmask);
if (page) {
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
return page;
}
}
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
return alloc_migrate_huge_page(h, gfp_mask, preferred_nid, nmask);
}
@@ -1964,6 +1967,7 @@ static int gather_surplus_pages(struct hstate *h, long delta)
long needed, allocated;
bool alloc_ok = true;
+ lockdep_assert_held(&hugetlb_lock);
needed = (h->resv_huge_pages + delta) - h->free_huge_pages;
if (needed <= 0) {
h->resv_huge_pages += delta;
@@ -1975,7 +1979,7 @@ static int gather_surplus_pages(struct hstate *h, long delta)
ret = -ENOMEM;
retry:
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
for (i = 0; i < needed; i++) {
page = alloc_surplus_huge_page(h, htlb_alloc_mask(h),
NUMA_NO_NODE, NULL);
@@ -1992,7 +1996,7 @@ retry:
* After retaking hugetlb_lock, we need to recalculate 'needed'
* because either resv_huge_pages or free_huge_pages may have changed.
*/
- spin_lock(&hugetlb_lock);
+ spin_lock_irq(&hugetlb_lock);
needed = (h->resv_huge_pages + delta) -
(h->free_huge_pages + allocated);
if (needed > 0) {
@@ -2032,12 +2036,12 @@ retry:
enqueue_huge_page(h, page);
}
free:
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
/* Free unnecessary surplus pages to the buddy allocator */
list_for_each_entry_safe(page, tmp, &surplus_list, lru)
put_page(page);
- spin_lock(&hugetlb_lock);
+ spin_lock_irq(&hugetlb_lock);
return ret;
}
@@ -2049,17 +2053,17 @@ free:
* to the associated reservation map.
* 2) Free any unused surplus pages that may have been allocated to satisfy
* the reservation. As many as unused_resv_pages may be freed.
- *
- * Called with hugetlb_lock held. However, the lock could be dropped (and
- * reacquired) during calls to cond_resched_lock. Whenever dropping the lock,
- * we must make sure nobody else can claim pages we are in the process of
- * freeing. Do this by ensuring resv_huge_page always is greater than the
- * number of huge pages we plan to free when dropping the lock.
*/
static void return_unused_surplus_pages(struct hstate *h,
unsigned long unused_resv_pages)
{
unsigned long nr_pages;
+ struct page *page;
+ LIST_HEAD(page_list);
+
+ lockdep_assert_held(&hugetlb_lock);
+ /* Uncommit the reservation */
+ h->resv_huge_pages -= unused_resv_pages;
/* Cannot return gigantic pages currently */
if (hstate_is_gigantic(h))
@@ -2076,24 +2080,21 @@ static void return_unused_surplus_pages(struct hstate *h,
* evenly across all nodes with memory. Iterate across these nodes
* until we can no longer free unreserved surplus pages. This occurs
* when the nodes with surplus pages have no free pages.
- * free_pool_huge_page() will balance the freed pages across the
+ * remove_pool_huge_page() will balance the freed pages across the
* on-line nodes with memory and will handle the hstate accounting.
- *
- * Note that we decrement resv_huge_pages as we free the pages. If
- * we drop the lock, resv_huge_pages will still be sufficiently large
- * to cover subsequent pages we may free.
*/
while (nr_pages--) {
- h->resv_huge_pages--;
- unused_resv_pages--;
- if (!free_pool_huge_page(h, &node_states[N_MEMORY], 1))
+ page = remove_pool_huge_page(h, &node_states[N_MEMORY], 1);
+ if (!page)
goto out;
- cond_resched_lock(&hugetlb_lock);
+
+ list_add(&page->lru, &page_list);
}
out:
- /* Fully uncommit the reservation */
- h->resv_huge_pages -= unused_resv_pages;
+ spin_unlock_irq(&hugetlb_lock);
+ update_and_free_pages_bulk(h, &page_list);
+ spin_lock_irq(&hugetlb_lock);
}
@@ -2175,27 +2176,26 @@ static long __vma_reservation_common(struct hstate *h,
if (vma->vm_flags & VM_MAYSHARE)
return ret;
- else if (is_vma_resv_set(vma, HPAGE_RESV_OWNER) && ret >= 0) {
- /*
- * In most cases, reserves always exist for private mappings.
- * However, a file associated with mapping could have been
- * hole punched or truncated after reserves were consumed.
- * As subsequent fault on such a range will not use reserves.
- * Subtle - The reserve map for private mappings has the
- * opposite meaning than that of shared mappings. If NO
- * entry is in the reserve map, it means a reservation exists.
- * If an entry exists in the reserve map, it means the
- * reservation has already been consumed. As a result, the
- * return value of this routine is the opposite of the
- * value returned from reserve map manipulation routines above.
- */
- if (ret)
- return 0;
- else
- return 1;
- }
- else
- return ret < 0 ? ret : 0;
+ /*
+ * We know private mapping must have HPAGE_RESV_OWNER set.
+ *
+ * In most cases, reserves always exist for private mappings.
+ * However, a file associated with mapping could have been
+ * hole punched or truncated after reserves were consumed.
+ * As subsequent fault on such a range will not use reserves.
+ * Subtle - The reserve map for private mappings has the
+ * opposite meaning than that of shared mappings. If NO
+ * entry is in the reserve map, it means a reservation exists.
+ * If an entry exists in the reserve map, it means the
+ * reservation has already been consumed. As a result, the
+ * return value of this routine is the opposite of the
+ * value returned from reserve map manipulation routines above.
+ */
+ if (ret > 0)
+ return 0;
+ if (ret == 0)
+ return 1;
+ return ret;
}
static long vma_needs_reservation(struct hstate *h,
@@ -2266,6 +2266,134 @@ static void restore_reserve_on_error(struct hstate *h,
}
}
+/*
+ * alloc_and_dissolve_huge_page - Allocate a new page and dissolve the old one
+ * @h: struct hstate old page belongs to
+ * @old_page: Old page to dissolve
+ * @list: List to isolate the page in case we need to
+ * Returns 0 on success, otherwise negated error.
+ */
+static int alloc_and_dissolve_huge_page(struct hstate *h, struct page *old_page,
+ struct list_head *list)
+{
+ gfp_t gfp_mask = htlb_alloc_mask(h) | __GFP_THISNODE;
+ int nid = page_to_nid(old_page);
+ struct page *new_page;
+ int ret = 0;
+
+ /*
+ * Before dissolving the page, we need to allocate a new one for the
+ * pool to remain stable. Using alloc_buddy_huge_page() allows us to
+ * not having to deal with prep_new_huge_page() and avoids dealing of any
+ * counters. This simplifies and let us do the whole thing under the
+ * lock.
+ */
+ new_page = alloc_buddy_huge_page(h, gfp_mask, nid, NULL, NULL);
+ if (!new_page)
+ return -ENOMEM;
+
+retry:
+ spin_lock_irq(&hugetlb_lock);
+ if (!PageHuge(old_page)) {
+ /*
+ * Freed from under us. Drop new_page too.
+ */
+ goto free_new;
+ } else if (page_count(old_page)) {
+ /*
+ * Someone has grabbed the page, try to isolate it here.
+ * Fail with -EBUSY if not possible.
+ */
+ spin_unlock_irq(&hugetlb_lock);
+ if (!isolate_huge_page(old_page, list))
+ ret = -EBUSY;
+ spin_lock_irq(&hugetlb_lock);
+ goto free_new;
+ } else if (!HPageFreed(old_page)) {
+ /*
+ * Page's refcount is 0 but it has not been enqueued in the
+ * freelist yet. Race window is small, so we can succeed here if
+ * we retry.
+ */
+ spin_unlock_irq(&hugetlb_lock);
+ cond_resched();
+ goto retry;
+ } else {
+ /*
+ * Ok, old_page is still a genuine free hugepage. Remove it from
+ * the freelist and decrease the counters. These will be
+ * incremented again when calling __prep_account_new_huge_page()
+ * and enqueue_huge_page() for new_page. The counters will remain
+ * stable since this happens under the lock.
+ */
+ remove_hugetlb_page(h, old_page, false);
+
+ /*
+ * new_page needs to be initialized with the standard hugetlb
+ * state. This is normally done by prep_new_huge_page() but
+ * that takes hugetlb_lock which is already held so we need to
+ * open code it here.
+ * Reference count trick is needed because allocator gives us
+ * referenced page but the pool requires pages with 0 refcount.
+ */
+ __prep_new_huge_page(new_page);
+ __prep_account_new_huge_page(h, nid);
+ page_ref_dec(new_page);
+ enqueue_huge_page(h, new_page);
+
+ /*
+ * Pages have been replaced, we can safely free the old one.
+ */
+ spin_unlock_irq(&hugetlb_lock);
+ update_and_free_page(h, old_page);
+ }
+
+ return ret;
+
+free_new:
+ spin_unlock_irq(&hugetlb_lock);
+ __free_pages(new_page, huge_page_order(h));
+
+ return ret;
+}
+
+int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list)
+{
+ struct hstate *h;
+ struct page *head;
+ int ret = -EBUSY;
+
+ /*
+ * The page might have been dissolved from under our feet, so make sure
+ * to carefully check the state under the lock.
+ * Return success when racing as if we dissolved the page ourselves.
+ */
+ spin_lock_irq(&hugetlb_lock);
+ if (PageHuge(page)) {
+ head = compound_head(page);
+ h = page_hstate(head);
+ } else {
+ spin_unlock_irq(&hugetlb_lock);
+ return 0;
+ }
+ spin_unlock_irq(&hugetlb_lock);
+
+ /*
+ * Fence off gigantic pages as there is a cyclic dependency between
+ * alloc_contig_range and them. Return -ENOMEM as this has the effect
+ * of bailing out right away without further retrying.
+ */
+ if (hstate_is_gigantic(h))
+ return -ENOMEM;
+
+ if (page_count(head) && isolate_huge_page(head, list))
+ ret = 0;
+ else if (!page_count(head))
+ ret = alloc_and_dissolve_huge_page(h, head, list);
+
+ return ret;
+}
+
struct page *alloc_huge_page(struct vm_area_struct *vma,
unsigned long addr, int avoid_reserve)
{
@@ -2316,7 +2444,7 @@ struct page *alloc_huge_page(struct vm_area_struct *vma,
/* If this allocation is not consuming a reservation, charge it now.
*/
- deferred_reserve = map_chg || avoid_reserve || !vma_resv_map(vma);
+ deferred_reserve = map_chg || avoid_reserve;
if (deferred_reserve) {
ret = hugetlb_cgroup_charge_cgroup_rsvd(
idx, pages_per_huge_page(h), &h_cg);
@@ -2328,7 +2456,7 @@ struct page *alloc_huge_page(struct vm_area_struct *vma,
if (ret)
goto out_uncharge_cgroup_reservation;
- spin_lock(&hugetlb_lock);
+ spin_lock_irq(&hugetlb_lock);
/*
* glb_chg is passed to indicate whether or not a page must be taken
* from the global free pool (global change). gbl_chg == 0 indicates
@@ -2336,7 +2464,7 @@ struct page *alloc_huge_page(struct vm_area_struct *vma,
*/
page = dequeue_huge_page_vma(h, vma, addr, avoid_reserve, gbl_chg);
if (!page) {
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
page = alloc_buddy_huge_page_with_mpol(h, vma, addr);
if (!page)
goto out_uncharge_cgroup;
@@ -2344,7 +2472,7 @@ struct page *alloc_huge_page(struct vm_area_struct *vma,
SetHPageRestoreReserve(page);
h->resv_huge_pages--;
}
- spin_lock(&hugetlb_lock);
+ spin_lock_irq(&hugetlb_lock);
list_add(&page->lru, &h->hugepage_activelist);
/* Fall through */
}
@@ -2357,7 +2485,7 @@ struct page *alloc_huge_page(struct vm_area_struct *vma,
h_cg, page);
}
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
hugetlb_set_page_subpool(page, spool);
@@ -2547,24 +2675,32 @@ static void try_to_free_low(struct hstate *h, unsigned long count,
nodemask_t *nodes_allowed)
{
int i;
+ LIST_HEAD(page_list);
+ lockdep_assert_held(&hugetlb_lock);
if (hstate_is_gigantic(h))
return;
+ /*
+ * Collect pages to be freed on a list, and free after dropping lock
+ */
for_each_node_mask(i, *nodes_allowed) {
struct page *page, *next;
struct list_head *freel = &h->hugepage_freelists[i];
list_for_each_entry_safe(page, next, freel, lru) {
if (count >= h->nr_huge_pages)
- return;
+ goto out;
if (PageHighMem(page))
continue;
- list_del(&page->lru);
- update_and_free_page(h, page);
- h->free_huge_pages--;
- h->free_huge_pages_node[page_to_nid(page)]--;
+ remove_hugetlb_page(h, page, false);
+ list_add(&page->lru, &page_list);
}
}
+
+out:
+ spin_unlock_irq(&hugetlb_lock);
+ update_and_free_pages_bulk(h, &page_list);
+ spin_lock_irq(&hugetlb_lock);
}
#else
static inline void try_to_free_low(struct hstate *h, unsigned long count,
@@ -2583,6 +2719,7 @@ static int adjust_pool_surplus(struct hstate *h, nodemask_t *nodes_allowed,
{
int nr_nodes, node;
+ lockdep_assert_held(&hugetlb_lock);
VM_BUG_ON(delta != -1 && delta != 1);
if (delta < 0) {
@@ -2610,6 +2747,8 @@ static int set_max_huge_pages(struct hstate *h, unsigned long count, int nid,
nodemask_t *nodes_allowed)
{
unsigned long min_count, ret;
+ struct page *page;
+ LIST_HEAD(page_list);
NODEMASK_ALLOC(nodemask_t, node_alloc_noretry, GFP_KERNEL);
/*
@@ -2622,7 +2761,12 @@ static int set_max_huge_pages(struct hstate *h, unsigned long count, int nid,
else
return -ENOMEM;
- spin_lock(&hugetlb_lock);
+ /*
+ * resize_lock mutex prevents concurrent adjustments to number of
+ * pages in hstate via the proc/sysfs interfaces.
+ */
+ mutex_lock(&h->resize_lock);
+ spin_lock_irq(&hugetlb_lock);
/*
* Check for a node specific request.
@@ -2653,7 +2797,8 @@ static int set_max_huge_pages(struct hstate *h, unsigned long count, int nid,
*/
if (hstate_is_gigantic(h) && !IS_ENABLED(CONFIG_CONTIG_ALLOC)) {
if (count > persistent_huge_pages(h)) {
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
+ mutex_unlock(&h->resize_lock);
NODEMASK_FREE(node_alloc_noretry);
return -EINVAL;
}
@@ -2682,14 +2827,14 @@ static int set_max_huge_pages(struct hstate *h, unsigned long count, int nid,
* page, free_huge_page will handle it by freeing the page
* and reducing the surplus.
*/
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
/* yield cpu to avoid soft lockup */
cond_resched();
ret = alloc_pool_huge_page(h, nodes_allowed,
node_alloc_noretry);
- spin_lock(&hugetlb_lock);
+ spin_lock_irq(&hugetlb_lock);
if (!ret)
goto out;
@@ -2716,18 +2861,30 @@ static int set_max_huge_pages(struct hstate *h, unsigned long count, int nid,
min_count = h->resv_huge_pages + h->nr_huge_pages - h->free_huge_pages;
min_count = max(count, min_count);
try_to_free_low(h, min_count, nodes_allowed);
+
+ /*
+ * Collect pages to be removed on list without dropping lock
+ */
while (min_count < persistent_huge_pages(h)) {
- if (!free_pool_huge_page(h, nodes_allowed, 0))
+ page = remove_pool_huge_page(h, nodes_allowed, 0);
+ if (!page)
break;
- cond_resched_lock(&hugetlb_lock);
+
+ list_add(&page->lru, &page_list);
}
+ /* free the pages after dropping lock */
+ spin_unlock_irq(&hugetlb_lock);
+ update_and_free_pages_bulk(h, &page_list);
+ spin_lock_irq(&hugetlb_lock);
+
while (count < persistent_huge_pages(h)) {
if (!adjust_pool_surplus(h, nodes_allowed, 1))
break;
}
out:
h->max_huge_pages = persistent_huge_pages(h);
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
+ mutex_unlock(&h->resize_lock);
NODEMASK_FREE(node_alloc_noretry);
@@ -2882,9 +3039,9 @@ static ssize_t nr_overcommit_hugepages_store(struct kobject *kobj,
if (err)
return err;
- spin_lock(&hugetlb_lock);
+ spin_lock_irq(&hugetlb_lock);
h->nr_overcommit_huge_pages = input;
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
return count;
}
@@ -3215,6 +3372,7 @@ void __init hugetlb_add_hstate(unsigned int order)
BUG_ON(hugetlb_max_hstate >= HUGE_MAX_HSTATE);
BUG_ON(order == 0);
h = &hstates[hugetlb_max_hstate++];
+ mutex_init(&h->resize_lock);
h->order = order;
h->mask = ~(huge_page_size(h) - 1);
for (i = 0; i < MAX_NUMNODES; ++i)
@@ -3267,10 +3425,10 @@ static int __init hugepages_setup(char *s)
/*
* Global state is always initialized later in hugetlb_init.
- * But we need to allocate >= MAX_ORDER hstates here early to still
+ * But we need to allocate gigantic hstates here early to still
* use the bootmem allocator.
*/
- if (hugetlb_max_hstate && parsed_hstate->order >= MAX_ORDER)
+ if (hugetlb_max_hstate && hstate_is_gigantic(parsed_hstate))
hugetlb_hstate_alloc_pages(parsed_hstate);
last_mhp = mhp;
@@ -3470,9 +3628,9 @@ int hugetlb_overcommit_handler(struct ctl_table *table, int write,
goto out;
if (write) {
- spin_lock(&hugetlb_lock);
+ spin_lock_irq(&hugetlb_lock);
h->nr_overcommit_huge_pages = tmp;
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
}
out:
return ret;
@@ -3568,7 +3726,7 @@ static int hugetlb_acct_memory(struct hstate *h, long delta)
if (!delta)
return 0;
- spin_lock(&hugetlb_lock);
+ spin_lock_irq(&hugetlb_lock);
/*
* When cpuset is configured, it breaks the strict hugetlb page
* reservation as the accounting is done on a global variable. Such
@@ -3607,7 +3765,7 @@ static int hugetlb_acct_memory(struct hstate *h, long delta)
return_unused_surplus_pages(h, (unsigned long) -delta);
out:
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
return ret;
}
@@ -3795,7 +3953,7 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
src_pte = huge_pte_offset(src, addr, sz);
if (!src_pte)
continue;
- dst_pte = huge_pte_alloc(dst, addr, sz);
+ dst_pte = huge_pte_alloc(dst, vma, addr, sz);
if (!dst_pte) {
ret = -ENOMEM;
break;
@@ -4310,6 +4468,44 @@ int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
return 0;
}
+static inline vm_fault_t hugetlb_handle_userfault(struct vm_area_struct *vma,
+ struct address_space *mapping,
+ pgoff_t idx,
+ unsigned int flags,
+ unsigned long haddr,
+ unsigned long reason)
+{
+ vm_fault_t ret;
+ u32 hash;
+ struct vm_fault vmf = {
+ .vma = vma,
+ .address = haddr,
+ .flags = flags,
+
+ /*
+ * Hard to debug if it ends up being
+ * used by a callee that assumes
+ * something about the other
+ * uninitialized fields... same as in
+ * memory.c
+ */
+ };
+
+ /*
+ * hugetlb_fault_mutex and i_mmap_rwsem must be
+ * dropped before handling userfault. Reacquire
+ * after handling fault to make calling code simpler.
+ */
+ hash = hugetlb_fault_mutex_hash(mapping, idx);
+ mutex_unlock(&hugetlb_fault_mutex_table[hash]);
+ i_mmap_unlock_read(mapping);
+ ret = handle_userfault(&vmf, reason);
+ i_mmap_lock_read(mapping);
+ mutex_lock(&hugetlb_fault_mutex_table[hash]);
+
+ return ret;
+}
+
static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
struct vm_area_struct *vma,
struct address_space *mapping, pgoff_t idx,
@@ -4348,35 +4544,11 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
retry:
page = find_lock_page(mapping, idx);
if (!page) {
- /*
- * Check for page in userfault range
- */
+ /* Check for page in userfault range */
if (userfaultfd_missing(vma)) {
- u32 hash;
- struct vm_fault vmf = {
- .vma = vma,
- .address = haddr,
- .flags = flags,
- /*
- * Hard to debug if it ends up being
- * used by a callee that assumes
- * something about the other
- * uninitialized fields... same as in
- * memory.c
- */
- };
-
- /*
- * hugetlb_fault_mutex and i_mmap_rwsem must be
- * dropped before handling userfault. Reacquire
- * after handling fault to make calling code simpler.
- */
- hash = hugetlb_fault_mutex_hash(mapping, idx);
- mutex_unlock(&hugetlb_fault_mutex_table[hash]);
- i_mmap_unlock_read(mapping);
- ret = handle_userfault(&vmf, VM_UFFD_MISSING);
- i_mmap_lock_read(mapping);
- mutex_lock(&hugetlb_fault_mutex_table[hash]);
+ ret = hugetlb_handle_userfault(vma, mapping, idx,
+ flags, haddr,
+ VM_UFFD_MISSING);
goto out;
}
@@ -4395,13 +4567,10 @@ retry:
* sure there really is no pte entry.
*/
ptl = huge_pte_lock(h, mm, ptep);
- if (!huge_pte_none(huge_ptep_get(ptep))) {
- ret = 0;
- spin_unlock(ptl);
- goto out;
- }
+ ret = 0;
+ if (huge_pte_none(huge_ptep_get(ptep)))
+ ret = vmf_error(PTR_ERR(page));
spin_unlock(ptl);
- ret = vmf_error(PTR_ERR(page));
goto out;
}
clear_huge_page(page, address, pages_per_huge_page(h));
@@ -4435,6 +4604,16 @@ retry:
VM_FAULT_SET_HINDEX(hstate_index(h));
goto backout_unlocked;
}
+
+ /* Check for page in userfault range. */
+ if (userfaultfd_minor(vma)) {
+ unlock_page(page);
+ put_page(page);
+ ret = hugetlb_handle_userfault(vma, mapping, idx,
+ flags, haddr,
+ VM_UFFD_MINOR);
+ goto out;
+ }
}
/*
@@ -4563,7 +4742,7 @@ vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
*/
mapping = vma->vm_file->f_mapping;
i_mmap_lock_read(mapping);
- ptep = huge_pte_alloc(mm, haddr, huge_page_size(h));
+ ptep = huge_pte_alloc(mm, vma, haddr, huge_page_size(h));
if (!ptep) {
i_mmap_unlock_read(mapping);
return VM_FAULT_OOM;
@@ -4675,6 +4854,7 @@ out_mutex:
return ret;
}
+#ifdef CONFIG_USERFAULTFD
/*
* Used by userfaultfd UFFDIO_COPY. Based on mcopy_atomic_pte with
* modifications for huge pages.
@@ -4684,8 +4864,10 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
struct vm_area_struct *dst_vma,
unsigned long dst_addr,
unsigned long src_addr,
+ enum mcopy_atomic_mode mode,
struct page **pagep)
{
+ bool is_continue = (mode == MCOPY_ATOMIC_CONTINUE);
struct address_space *mapping;
pgoff_t idx;
unsigned long size;
@@ -4695,8 +4877,17 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
spinlock_t *ptl;
int ret;
struct page *page;
+ int writable;
+
+ mapping = dst_vma->vm_file->f_mapping;
+ idx = vma_hugecache_offset(h, dst_vma, dst_addr);
- if (!*pagep) {
+ if (is_continue) {
+ ret = -EFAULT;
+ page = find_lock_page(mapping, idx);
+ if (!page)
+ goto out;
+ } else if (!*pagep) {
ret = -ENOMEM;
page = alloc_huge_page(dst_vma, dst_addr, 0);
if (IS_ERR(page))
@@ -4725,13 +4916,8 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
*/
__SetPageUptodate(page);
- mapping = dst_vma->vm_file->f_mapping;
- idx = vma_hugecache_offset(h, dst_vma, dst_addr);
-
- /*
- * If shared, add to page cache
- */
- if (vm_shared) {
+ /* Add shared, newly allocated pages to the page cache. */
+ if (vm_shared && !is_continue) {
size = i_size_read(mapping->host) >> huge_page_shift(h);
ret = -EFAULT;
if (idx >= size)
@@ -4776,8 +4962,14 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
hugepage_add_new_anon_rmap(page, dst_vma, dst_addr);
}
- _dst_pte = make_huge_pte(dst_vma, page, dst_vma->vm_flags & VM_WRITE);
- if (dst_vma->vm_flags & VM_WRITE)
+ /* For CONTINUE on a non-shared VMA, don't set VM_WRITE for CoW. */
+ if (is_continue && !vm_shared)
+ writable = 0;
+ else
+ writable = dst_vma->vm_flags & VM_WRITE;
+
+ _dst_pte = make_huge_pte(dst_vma, page, writable);
+ if (writable)
_dst_pte = huge_pte_mkdirty(_dst_pte);
_dst_pte = pte_mkyoung(_dst_pte);
@@ -4791,20 +4983,22 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
update_mmu_cache(dst_vma, dst_addr, dst_pte);
spin_unlock(ptl);
- SetHPageMigratable(page);
- if (vm_shared)
+ if (!is_continue)
+ SetHPageMigratable(page);
+ if (vm_shared || is_continue)
unlock_page(page);
ret = 0;
out:
return ret;
out_release_unlock:
spin_unlock(ptl);
- if (vm_shared)
+ if (vm_shared || is_continue)
unlock_page(page);
out_release_nounlock:
put_page(page);
goto out;
}
+#endif /* CONFIG_USERFAULTFD */
static void record_subpages_vmas(struct page *page, struct vm_area_struct *vma,
int refs, struct page **pages,
@@ -4996,14 +5190,6 @@ long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
return i ? i : err;
}
-#ifndef __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE
-/*
- * ARCHes with special requirements for evicting HUGETLB backing TLB entries can
- * implement this.
- */
-#define flush_hugetlb_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end)
-#endif
-
unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
unsigned long address, unsigned long end, pgprot_t newprot)
{
@@ -5280,6 +5466,9 @@ long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
/*
* If the subpool has a minimum size, the number of global
* reservations to be released may be adjusted.
+ *
+ * Note that !resv_map implies freed == 0. So (chg - freed)
+ * won't go negative.
*/
gbl_reserve = hugepage_subpool_put_pages(spool, (chg - freed));
hugetlb_acct_memory(h, -gbl_reserve);
@@ -5326,6 +5515,15 @@ static bool vma_shareable(struct vm_area_struct *vma, unsigned long addr)
return false;
}
+bool want_pmd_share(struct vm_area_struct *vma, unsigned long addr)
+{
+#ifdef CONFIG_USERFAULTFD
+ if (uffd_disable_huge_pmd_share(vma))
+ return false;
+#endif
+ return vma_shareable(vma, addr);
+}
+
/*
* Determine if start,end range within vma could be mapped by shared pmd.
* If yes, adjust start and end to cover range associated with possible
@@ -5370,9 +5568,9 @@ void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma,
* if !vma_shareable check at the beginning of the routine. i_mmap_rwsem is
* only required for subsequent processing.
*/
-pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud)
+pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct *vma,
+ unsigned long addr, pud_t *pud)
{
- struct vm_area_struct *vma = find_vma(mm, addr);
struct address_space *mapping = vma->vm_file->f_mapping;
pgoff_t idx = ((addr - vma->vm_start) >> PAGE_SHIFT) +
vma->vm_pgoff;
@@ -5382,9 +5580,6 @@ pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud)
pte_t *pte;
spinlock_t *ptl;
- if (!vma_shareable(vma, addr))
- return (pte_t *)pmd_alloc(mm, pud, addr);
-
i_mmap_assert_locked(mapping);
vma_interval_tree_foreach(svma, &mapping->i_mmap, idx, idx) {
if (svma == vma)
@@ -5448,9 +5643,10 @@ int huge_pmd_unshare(struct mm_struct *mm, struct vm_area_struct *vma,
*addr = ALIGN(*addr, HPAGE_SIZE * PTRS_PER_PTE) - HPAGE_SIZE;
return 1;
}
-#define want_pmd_share() (1)
+
#else /* !CONFIG_ARCH_WANT_HUGE_PMD_SHARE */
-pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud)
+pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct *vma,
+ unsigned long addr, pud_t *pud)
{
return NULL;
}
@@ -5465,11 +5661,15 @@ void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma,
unsigned long *start, unsigned long *end)
{
}
-#define want_pmd_share() (0)
+
+bool want_pmd_share(struct vm_area_struct *vma, unsigned long addr)
+{
+ return false;
+}
#endif /* CONFIG_ARCH_WANT_HUGE_PMD_SHARE */
#ifdef CONFIG_ARCH_WANT_GENERAL_HUGETLB
-pte_t *huge_pte_alloc(struct mm_struct *mm,
+pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long addr, unsigned long sz)
{
pgd_t *pgd;
@@ -5487,8 +5687,8 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
pte = (pte_t *)pud;
} else {
BUG_ON(sz != PMD_SIZE);
- if (want_pmd_share() && pud_none(*pud))
- pte = huge_pmd_share(mm, addr, pud);
+ if (want_pmd_share(vma, addr) && pud_none(*pud))
+ pte = huge_pmd_share(mm, vma, addr, pud);
else
pte = (pte_t *)pmd_alloc(mm, pud, addr);
}
@@ -5632,7 +5832,7 @@ bool isolate_huge_page(struct page *page, struct list_head *list)
{
bool ret = true;
- spin_lock(&hugetlb_lock);
+ spin_lock_irq(&hugetlb_lock);
if (!PageHeadHuge(page) ||
!HPageMigratable(page) ||
!get_page_unless_zero(page)) {
@@ -5642,16 +5842,16 @@ bool isolate_huge_page(struct page *page, struct list_head *list)
ClearHPageMigratable(page);
list_move_tail(&page->lru, list);
unlock:
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
return ret;
}
void putback_active_hugepage(struct page *page)
{
- spin_lock(&hugetlb_lock);
+ spin_lock_irq(&hugetlb_lock);
SetHPageMigratable(page);
list_move_tail(&page->lru, &(page_hstate(page))->hugepage_activelist);
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
put_page(page);
}
@@ -5679,13 +5879,70 @@ void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason)
SetHPageTemporary(oldpage);
ClearHPageTemporary(newpage);
- spin_lock(&hugetlb_lock);
+ /*
+ * There is no need to transfer the per-node surplus state
+ * when we do not cross the node.
+ */
+ if (new_nid == old_nid)
+ return;
+ spin_lock_irq(&hugetlb_lock);
if (h->surplus_huge_pages_node[old_nid]) {
h->surplus_huge_pages_node[old_nid]--;
h->surplus_huge_pages_node[new_nid]++;
}
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
+ }
+}
+
+/*
+ * This function will unconditionally remove all the shared pmd pgtable entries
+ * within the specific vma for a hugetlbfs memory range.
+ */
+void hugetlb_unshare_all_pmds(struct vm_area_struct *vma)
+{
+ struct hstate *h = hstate_vma(vma);
+ unsigned long sz = huge_page_size(h);
+ struct mm_struct *mm = vma->vm_mm;
+ struct mmu_notifier_range range;
+ unsigned long address, start, end;
+ spinlock_t *ptl;
+ pte_t *ptep;
+
+ if (!(vma->vm_flags & VM_MAYSHARE))
+ return;
+
+ start = ALIGN(vma->vm_start, PUD_SIZE);
+ end = ALIGN_DOWN(vma->vm_end, PUD_SIZE);
+
+ if (start >= end)
+ return;
+
+ /*
+ * No need to call adjust_range_if_pmd_sharing_possible(), because
+ * we have already done the PUD_SIZE alignment.
+ */
+ mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, mm,
+ start, end);
+ mmu_notifier_invalidate_range_start(&range);
+ i_mmap_lock_write(vma->vm_file->f_mapping);
+ for (address = start; address < end; address += PUD_SIZE) {
+ unsigned long tmp = address;
+
+ ptep = huge_pte_offset(mm, address, sz);
+ if (!ptep)
+ continue;
+ ptl = huge_pte_lock(h, mm, ptep);
+ /* We don't want 'address' to be changed */
+ huge_pmd_unshare(mm, vma, &tmp, ptep);
+ spin_unlock(ptl);
}
+ flush_hugetlb_tlb_range(vma, start, end);
+ i_mmap_unlock_write(vma->vm_file->f_mapping);
+ /*
+ * No need to call mmu_notifier_invalidate_range(), see
+ * Documentation/vm/mmu_notifier.rst.
+ */
+ mmu_notifier_invalidate_range_end(&range);
}
#ifdef CONFIG_CMA
diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
index 603a131e262d..5383023d0cca 100644
--- a/mm/hugetlb_cgroup.c
+++ b/mm/hugetlb_cgroup.c
@@ -204,11 +204,11 @@ static void hugetlb_cgroup_css_offline(struct cgroup_subsys_state *css)
do {
idx = 0;
for_each_hstate(h) {
- spin_lock(&hugetlb_lock);
+ spin_lock_irq(&hugetlb_lock);
list_for_each_entry(page, &h->hugepage_activelist, lru)
hugetlb_cgroup_move_parent(idx, h_cg, page);
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
idx++;
}
cond_resched();
@@ -784,8 +784,7 @@ void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
if (hugetlb_cgroup_disabled())
return;
- VM_BUG_ON_PAGE(!PageHuge(oldhpage), oldhpage);
- spin_lock(&hugetlb_lock);
+ spin_lock_irq(&hugetlb_lock);
h_cg = hugetlb_cgroup_from_page(oldhpage);
h_cg_rsvd = hugetlb_cgroup_from_page_rsvd(oldhpage);
set_hugetlb_cgroup(oldhpage, NULL);
@@ -795,7 +794,7 @@ void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
set_hugetlb_cgroup(newhpage, h_cg);
set_hugetlb_cgroup_rsvd(newhpage, h_cg_rsvd);
list_move(&newhpage->lru, &h->hugepage_activelist);
- spin_unlock(&hugetlb_lock);
+ spin_unlock_irq(&hugetlb_lock);
return;
}
diff --git a/mm/internal.h b/mm/internal.h
index ef5f336f59bd..feeaaf06705d 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -244,7 +244,13 @@ struct compact_control {
unsigned int nr_freepages; /* Number of isolated free pages */
unsigned int nr_migratepages; /* Number of pages to migrate */
unsigned long free_pfn; /* isolate_freepages search base */
- unsigned long migrate_pfn; /* isolate_migratepages search base */
+ /*
+ * Acts as an in/out parameter to page isolation for migration.
+ * isolate_migratepages uses it as a search base.
+ * isolate_migratepages_block will update the value to the next pfn
+ * after the last isolated one.
+ */
+ unsigned long migrate_pfn;
unsigned long fast_start_pfn; /* a pfn to start linear scan from */
struct zone *zone;
unsigned long total_migrate_scanned;
@@ -280,7 +286,7 @@ struct capture_control {
unsigned long
isolate_freepages_range(struct compact_control *cc,
unsigned long start_pfn, unsigned long end_pfn);
-unsigned long
+int
isolate_migratepages_range(struct compact_control *cc,
unsigned long low_pfn, unsigned long end_pfn);
int find_suitable_fallback(struct free_area *area, unsigned int order,
diff --git a/mm/kfence/core.c b/mm/kfence/core.c
index d53c91f881a4..e18fbbd5d9b4 100644
--- a/mm/kfence/core.c
+++ b/mm/kfence/core.c
@@ -10,6 +10,7 @@
#include <linux/atomic.h>
#include <linux/bug.h>
#include <linux/debugfs.h>
+#include <linux/irq_work.h>
#include <linux/kcsan-checks.h>
#include <linux/kfence.h>
#include <linux/kmemleak.h>
@@ -19,6 +20,7 @@
#include <linux/moduleparam.h>
#include <linux/random.h>
#include <linux/rcupdate.h>
+#include <linux/sched/sysctl.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
@@ -372,6 +374,7 @@ static void kfence_guarded_free(void *addr, struct kfence_metadata *meta, bool z
/* Restore page protection if there was an OOB access. */
if (meta->unprotected_page) {
+ memzero_explicit((void *)ALIGN_DOWN(meta->unprotected_page, PAGE_SIZE), PAGE_SIZE);
kfence_protect(meta->unprotected_page);
meta->unprotected_page = 0;
}
@@ -586,6 +589,17 @@ late_initcall(kfence_debugfs_init);
/* === Allocation Gate Timer ================================================ */
+#ifdef CONFIG_KFENCE_STATIC_KEYS
+/* Wait queue to wake up allocation-gate timer task. */
+static DECLARE_WAIT_QUEUE_HEAD(allocation_wait);
+
+static void wake_up_kfence_timer(struct irq_work *work)
+{
+ wake_up(&allocation_wait);
+}
+static DEFINE_IRQ_WORK(wake_up_kfence_timer_work, wake_up_kfence_timer);
+#endif
+
/*
* Set up delayed work, which will enable and disable the static key. We need to
* use a work queue (rather than a simple timer), since enabling and disabling a
@@ -603,29 +617,27 @@ static void toggle_allocation_gate(struct work_struct *work)
if (!READ_ONCE(kfence_enabled))
return;
- /* Enable static key, and await allocation to happen. */
atomic_set(&kfence_allocation_gate, 0);
#ifdef CONFIG_KFENCE_STATIC_KEYS
+ /* Enable static key, and await allocation to happen. */
static_branch_enable(&kfence_allocation_key);
- /*
- * Await an allocation. Timeout after 1 second, in case the kernel stops
- * doing allocations, to avoid stalling this worker task for too long.
- */
- {
- unsigned long end_wait = jiffies + HZ;
-
- do {
- set_current_state(TASK_UNINTERRUPTIBLE);
- if (atomic_read(&kfence_allocation_gate) != 0)
- break;
- schedule_timeout(1);
- } while (time_before(jiffies, end_wait));
- __set_current_state(TASK_RUNNING);
+
+ if (sysctl_hung_task_timeout_secs) {
+ /*
+ * During low activity with no allocations we might wait a
+ * while; let's avoid the hung task warning.
+ */
+ wait_event_timeout(allocation_wait, atomic_read(&kfence_allocation_gate),
+ sysctl_hung_task_timeout_secs * HZ / 2);
+ } else {
+ wait_event(allocation_wait, atomic_read(&kfence_allocation_gate));
}
+
/* Disable static key and reset timer. */
static_branch_disable(&kfence_allocation_key);
#endif
- schedule_delayed_work(&kfence_timer, msecs_to_jiffies(kfence_sample_interval));
+ queue_delayed_work(system_power_efficient_wq, &kfence_timer,
+ msecs_to_jiffies(kfence_sample_interval));
}
static DECLARE_DELAYED_WORK(kfence_timer, toggle_allocation_gate);
@@ -654,7 +666,7 @@ void __init kfence_init(void)
}
WRITE_ONCE(kfence_enabled, true);
- schedule_delayed_work(&kfence_timer, 0);
+ queue_delayed_work(system_power_efficient_wq, &kfence_timer, 0);
pr_info("initialized - using %lu bytes for %d objects at 0x%p-0x%p\n", KFENCE_POOL_SIZE,
CONFIG_KFENCE_NUM_OBJECTS, (void *)__kfence_pool,
(void *)(__kfence_pool + KFENCE_POOL_SIZE));
@@ -728,6 +740,19 @@ void *__kfence_alloc(struct kmem_cache *s, size_t size, gfp_t flags)
*/
if (atomic_read(&kfence_allocation_gate) || atomic_inc_return(&kfence_allocation_gate) > 1)
return NULL;
+#ifdef CONFIG_KFENCE_STATIC_KEYS
+ /*
+ * waitqueue_active() is fully ordered after the update of
+ * kfence_allocation_gate per atomic_inc_return().
+ */
+ if (waitqueue_active(&allocation_wait)) {
+ /*
+ * Calling wake_up() here may deadlock when allocations happen
+ * from within timer code. Use an irq_work to defer it.
+ */
+ irq_work_queue(&wake_up_kfence_timer_work);
+ }
+#endif
if (!READ_ONCE(kfence_enabled))
return NULL;
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index a7d6cb912b05..ea74da3232ab 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -481,7 +481,7 @@ int __khugepaged_enter(struct mm_struct *mm)
return -ENOMEM;
/* __khugepaged_exit() must not run from under us */
- VM_BUG_ON_MM(atomic_read(&mm->mm_users) == 0, mm);
+ VM_BUG_ON_MM(khugepaged_test_exit(mm), mm);
if (unlikely(test_and_set_bit(MMF_VM_HUGEPAGE, &mm->flags))) {
free_mm_slot(mm_slot);
return 0;
@@ -716,17 +716,17 @@ next:
if (pte_write(pteval))
writable = true;
}
- if (likely(writable)) {
- if (likely(referenced)) {
- result = SCAN_SUCCEED;
- trace_mm_collapse_huge_page_isolate(page, none_or_zero,
- referenced, writable, result);
- return 1;
- }
- } else {
+
+ if (unlikely(!writable)) {
result = SCAN_PAGE_RO;
+ } else if (unlikely(!referenced)) {
+ result = SCAN_LACK_REFERENCED_PAGE;
+ } else {
+ result = SCAN_SUCCEED;
+ trace_mm_collapse_huge_page_isolate(page, none_or_zero,
+ referenced, writable, result);
+ return 1;
}
-
out:
release_pte_pages(pte, _pte, compound_pagelist);
trace_mm_collapse_huge_page_isolate(page, none_or_zero,
@@ -809,7 +809,7 @@ static bool khugepaged_scan_abort(int nid)
* If node_reclaim_mode is disabled, then no extra effort is made to
* allocate memory locally.
*/
- if (!node_reclaim_mode)
+ if (!node_reclaim_enabled())
return false;
/* If there is a count for this node already, it must be acceptable */
@@ -1128,10 +1128,10 @@ static void collapse_huge_page(struct mm_struct *mm,
mmap_write_lock(mm);
result = hugepage_vma_revalidate(mm, address, &vma);
if (result)
- goto out;
+ goto out_up_write;
/* check if the pmd is still valid */
if (mm_find_pmd(mm, address) != pmd)
- goto out;
+ goto out_up_write;
anon_vma_lock_write(vma->anon_vma);
@@ -1171,7 +1171,7 @@ static void collapse_huge_page(struct mm_struct *mm,
spin_unlock(pmd_ptl);
anon_vma_unlock_write(vma->anon_vma);
result = SCAN_FAIL;
- goto out;
+ goto out_up_write;
}
/*
@@ -1183,19 +1183,18 @@ static void collapse_huge_page(struct mm_struct *mm,
__collapse_huge_page_copy(pte, new_page, vma, address, pte_ptl,
&compound_pagelist);
pte_unmap(pte);
+ /*
+ * spin_lock() below is not the equivalent of smp_wmb(), but
+ * the smp_wmb() inside __SetPageUptodate() can be reused to
+ * avoid the copy_huge_page writes to become visible after
+ * the set_pmd_at() write.
+ */
__SetPageUptodate(new_page);
pgtable = pmd_pgtable(_pmd);
_pmd = mk_huge_pmd(new_page, vma->vm_page_prot);
_pmd = maybe_pmd_mkwrite(pmd_mkdirty(_pmd), vma);
- /*
- * spin_lock() below is not the equivalent of smp_wmb(), so
- * this is needed to avoid the copy_huge_page writes to become
- * visible after the set_pmd_at() write.
- */
- smp_wmb();
-
spin_lock(pmd_ptl);
BUG_ON(!pmd_none(*pmd));
page_add_new_anon_rmap(new_page, vma, address, true);
@@ -1216,8 +1215,6 @@ out_nolock:
mem_cgroup_uncharge(*hpage);
trace_mm_collapse_huge_page(mm, isolated, result);
return;
-out:
- goto out_up_write;
}
static int khugepaged_scan_pmd(struct mm_struct *mm,
@@ -1274,10 +1271,6 @@ static int khugepaged_scan_pmd(struct mm_struct *mm,
goto out_unmap;
}
}
- if (!pte_present(pteval)) {
- result = SCAN_PTE_NON_PRESENT;
- goto out_unmap;
- }
if (pte_uffd_wp(pteval)) {
/*
* Don't collapse the page if any of the small
@@ -1447,7 +1440,7 @@ void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr)
int i;
if (!vma || !vma->vm_file ||
- vma->vm_start > haddr || vma->vm_end < haddr + HPAGE_PMD_SIZE)
+ !range_in_vma(vma, haddr, haddr + HPAGE_PMD_SIZE))
return;
/*
@@ -1533,16 +1526,16 @@ abort:
goto drop_hpage;
}
-static int khugepaged_collapse_pte_mapped_thps(struct mm_slot *mm_slot)
+static void khugepaged_collapse_pte_mapped_thps(struct mm_slot *mm_slot)
{
struct mm_struct *mm = mm_slot->mm;
int i;
if (likely(mm_slot->nr_pte_mapped_thp == 0))
- return 0;
+ return;
if (!mmap_write_trylock(mm))
- return -EBUSY;
+ return;
if (unlikely(khugepaged_test_exit(mm)))
goto out;
@@ -1553,7 +1546,6 @@ static int khugepaged_collapse_pte_mapped_thps(struct mm_slot *mm_slot)
out:
mm_slot->nr_pte_mapped_thp = 0;
mmap_write_unlock(mm);
- return 0;
}
static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff)
@@ -2057,9 +2049,8 @@ static void khugepaged_scan_file(struct mm_struct *mm,
BUILD_BUG();
}
-static int khugepaged_collapse_pte_mapped_thps(struct mm_slot *mm_slot)
+static void khugepaged_collapse_pte_mapped_thps(struct mm_slot *mm_slot)
{
- return 0;
}
#endif
@@ -2205,11 +2196,9 @@ static void khugepaged_do_scan(void)
{
struct page *hpage = NULL;
unsigned int progress = 0, pass_through_head = 0;
- unsigned int pages = khugepaged_pages_to_scan;
+ unsigned int pages = READ_ONCE(khugepaged_pages_to_scan);
bool wait = true;
- barrier(); /* write khugepaged_pages_to_scan to local stack */
-
lru_add_drain_all();
while (progress < pages) {
diff --git a/mm/ksm.c b/mm/ksm.c
index 9694ee2c71de..b321a67ebaa9 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -215,8 +215,6 @@ struct rmap_item {
#define SEQNR_MASK 0x0ff /* low bits of unstable tree seqnr */
#define UNSTABLE_FLAG 0x100 /* is a node of the unstable tree */
#define STABLE_FLAG 0x200 /* is listed from the stable tree */
-#define KSM_FLAG_MASK (SEQNR_MASK|UNSTABLE_FLAG|STABLE_FLAG)
- /* to mask all the flags */
/* The stable and unstable tree heads */
static struct rb_root one_stable_tree[1] = { RB_ROOT };
@@ -778,12 +776,11 @@ static void remove_rmap_item_from_tree(struct rmap_item *rmap_item)
struct page *page;
stable_node = rmap_item->head;
- page = get_ksm_page(stable_node, GET_KSM_PAGE_LOCK);
+ page = get_ksm_page(stable_node, GET_KSM_PAGE_NOLOCK);
if (!page)
goto out;
hlist_del(&rmap_item->hlist);
- unlock_page(page);
put_page(page);
if (!hlist_empty(&stable_node->hlist))
@@ -794,6 +791,7 @@ static void remove_rmap_item_from_tree(struct rmap_item *rmap_item)
stable_node->rmap_hlist_len--;
put_anon_vma(rmap_item->anon_vma);
+ rmap_item->head = NULL;
rmap_item->address &= PAGE_MASK;
} else if (rmap_item->address & UNSTABLE_FLAG) {
@@ -817,8 +815,7 @@ out:
cond_resched(); /* we're called from many long loops */
}
-static void remove_trailing_rmap_items(struct mm_slot *mm_slot,
- struct rmap_item **rmap_list)
+static void remove_trailing_rmap_items(struct rmap_item **rmap_list)
{
while (*rmap_list) {
struct rmap_item *rmap_item = *rmap_list;
@@ -989,7 +986,7 @@ static int unmerge_and_remove_all_rmap_items(void)
goto error;
}
- remove_trailing_rmap_items(mm_slot, &mm_slot->rmap_list);
+ remove_trailing_rmap_items(&mm_slot->rmap_list);
mmap_read_unlock(mm);
spin_lock(&ksm_mmlist_lock);
@@ -1771,7 +1768,6 @@ chain_append:
* stable_node_dup is the dup to replace.
*/
if (stable_node_dup == stable_node) {
- VM_BUG_ON(is_stable_node_chain(stable_node_dup));
VM_BUG_ON(is_stable_node_dup(stable_node_dup));
/* chain is missing so create it */
stable_node = alloc_stable_node_chain(stable_node_dup,
@@ -1785,7 +1781,6 @@ chain_append:
* of the current nid for this page
* content.
*/
- VM_BUG_ON(!is_stable_node_chain(stable_node));
VM_BUG_ON(!is_stable_node_dup(stable_node_dup));
VM_BUG_ON(page_node->head != &migrate_nodes);
list_del(&page_node->list);
@@ -2337,7 +2332,7 @@ next_mm:
* Nuke all the rmap_items that are above this current rmap:
* because there were no VM_MERGEABLE vmas with such addresses.
*/
- remove_trailing_rmap_items(slot, ksm_scan.rmap_list);
+ remove_trailing_rmap_items(ksm_scan.rmap_list);
spin_lock(&ksm_mmlist_lock);
ksm_scan.mm_slot = list_entry(slot->mm_list.next,
@@ -2634,7 +2629,7 @@ again:
vma = vmac->vma;
/* Ignore the stable/unstable/sqnr flags */
- addr = rmap_item->address & ~KSM_FLAG_MASK;
+ addr = rmap_item->address & PAGE_MASK;
if (addr < vma->vm_start || addr >= vma->vm_end)
continue;
diff --git a/mm/list_lru.c b/mm/list_lru.c
index 6f067b6b935f..cd58790d0fb3 100644
--- a/mm/list_lru.c
+++ b/mm/list_lru.c
@@ -125,8 +125,8 @@ bool list_lru_add(struct list_lru *lru, struct list_head *item)
list_add_tail(item, &l->list);
/* Set shrinker bit if the first element was added */
if (!l->nr_items++)
- memcg_set_shrinker_bit(memcg, nid,
- lru_shrinker_id(lru));
+ set_shrinker_bit(memcg, nid,
+ lru_shrinker_id(lru));
nlru->nr_items++;
spin_unlock(&nlru->lock);
return true;
@@ -540,7 +540,7 @@ static void memcg_drain_list_lru_node(struct list_lru *lru, int nid,
if (src->nr_items) {
dst->nr_items += src->nr_items;
- memcg_set_shrinker_bit(dst_memcg, nid, lru_shrinker_id(lru));
+ set_shrinker_bit(dst_memcg, nid, lru_shrinker_id(lru));
src->nr_items = 0;
}
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c100265dc393..3004afb6d090 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -400,130 +400,6 @@ DEFINE_STATIC_KEY_FALSE(memcg_kmem_enabled_key);
EXPORT_SYMBOL(memcg_kmem_enabled_key);
#endif
-static int memcg_shrinker_map_size;
-static DEFINE_MUTEX(memcg_shrinker_map_mutex);
-
-static void memcg_free_shrinker_map_rcu(struct rcu_head *head)
-{
- kvfree(container_of(head, struct memcg_shrinker_map, rcu));
-}
-
-static int memcg_expand_one_shrinker_map(struct mem_cgroup *memcg,
- int size, int old_size)
-{
- struct memcg_shrinker_map *new, *old;
- struct mem_cgroup_per_node *pn;
- int nid;
-
- lockdep_assert_held(&memcg_shrinker_map_mutex);
-
- for_each_node(nid) {
- pn = memcg->nodeinfo[nid];
- old = rcu_dereference_protected(pn->shrinker_map, true);
- /* Not yet online memcg */
- if (!old)
- return 0;
-
- new = kvmalloc_node(sizeof(*new) + size, GFP_KERNEL, nid);
- if (!new)
- return -ENOMEM;
-
- /* Set all old bits, clear all new bits */
- memset(new->map, (int)0xff, old_size);
- memset((void *)new->map + old_size, 0, size - old_size);
-
- rcu_assign_pointer(pn->shrinker_map, new);
- call_rcu(&old->rcu, memcg_free_shrinker_map_rcu);
- }
-
- return 0;
-}
-
-static void memcg_free_shrinker_maps(struct mem_cgroup *memcg)
-{
- struct mem_cgroup_per_node *pn;
- struct memcg_shrinker_map *map;
- int nid;
-
- if (mem_cgroup_is_root(memcg))
- return;
-
- for_each_node(nid) {
- pn = memcg->nodeinfo[nid];
- map = rcu_dereference_protected(pn->shrinker_map, true);
- kvfree(map);
- rcu_assign_pointer(pn->shrinker_map, NULL);
- }
-}
-
-static int memcg_alloc_shrinker_maps(struct mem_cgroup *memcg)
-{
- struct memcg_shrinker_map *map;
- int nid, size, ret = 0;
-
- if (mem_cgroup_is_root(memcg))
- return 0;
-
- mutex_lock(&memcg_shrinker_map_mutex);
- size = memcg_shrinker_map_size;
- for_each_node(nid) {
- map = kvzalloc_node(sizeof(*map) + size, GFP_KERNEL, nid);
- if (!map) {
- memcg_free_shrinker_maps(memcg);
- ret = -ENOMEM;
- break;
- }
- rcu_assign_pointer(memcg->nodeinfo[nid]->shrinker_map, map);
- }
- mutex_unlock(&memcg_shrinker_map_mutex);
-
- return ret;
-}
-
-int memcg_expand_shrinker_maps(int new_id)
-{
- int size, old_size, ret = 0;
- struct mem_cgroup *memcg;
-
- size = DIV_ROUND_UP(new_id + 1, BITS_PER_LONG) * sizeof(unsigned long);
- old_size = memcg_shrinker_map_size;
- if (size <= old_size)
- return 0;
-
- mutex_lock(&memcg_shrinker_map_mutex);
- if (!root_mem_cgroup)
- goto unlock;
-
- for_each_mem_cgroup(memcg) {
- if (mem_cgroup_is_root(memcg))
- continue;
- ret = memcg_expand_one_shrinker_map(memcg, size, old_size);
- if (ret) {
- mem_cgroup_iter_break(NULL, memcg);
- goto unlock;
- }
- }
-unlock:
- if (!ret)
- memcg_shrinker_map_size = size;
- mutex_unlock(&memcg_shrinker_map_mutex);
- return ret;
-}
-
-void memcg_set_shrinker_bit(struct mem_cgroup *memcg, int nid, int shrinker_id)
-{
- if (shrinker_id >= 0 && memcg && !mem_cgroup_is_root(memcg)) {
- struct memcg_shrinker_map *map;
-
- rcu_read_lock();
- map = rcu_dereference(memcg->nodeinfo[nid]->shrinker_map);
- /* Pairs with smp mb in shrink_slab() */
- smp_mb__before_atomic();
- set_bit(shrinker_id, map->map);
- rcu_read_unlock();
- }
-}
-
/**
* mem_cgroup_css_from_page - css of the memcg associated with a page
* @page: page of interest
@@ -5242,11 +5118,11 @@ static int mem_cgroup_css_online(struct cgroup_subsys_state *css)
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
/*
- * A memcg must be visible for memcg_expand_shrinker_maps()
+ * A memcg must be visible for expand_shrinker_info()
* by the time the maps are allocated. So, we allocate maps
* here, when for_each_mem_cgroup() can't skip it.
*/
- if (memcg_alloc_shrinker_maps(memcg)) {
+ if (alloc_shrinker_info(memcg)) {
mem_cgroup_id_remove(memcg);
return -ENOMEM;
}
@@ -5278,6 +5154,7 @@ static void mem_cgroup_css_offline(struct cgroup_subsys_state *css)
page_counter_set_low(&memcg->memory, 0);
memcg_offline_kmem(memcg);
+ reparent_shrinker_deferred(memcg);
wb_memcg_offline(memcg);
drain_all_stock(memcg);
@@ -5310,7 +5187,7 @@ static void mem_cgroup_css_free(struct cgroup_subsys_state *css)
vmpressure_cleanup(&memcg->vmpressure);
cancel_work_sync(&memcg->high_work);
mem_cgroup_remove_from_trees(memcg);
- memcg_free_shrinker_maps(memcg);
+ free_shrinker_info(memcg);
memcg_free_kmem(memcg);
mem_cgroup_free(memcg);
}
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 0cdbbfbc5757..70620d0dd923 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -42,6 +42,16 @@
#include "internal.h"
#include "shuffle.h"
+
+/*
+ * memory_hotplug.memmap_on_memory parameter
+ */
+static bool memmap_on_memory __ro_after_init;
+#ifdef CONFIG_MHP_MEMMAP_ON_MEMORY
+module_param(memmap_on_memory, bool, 0444);
+MODULE_PARM_DESC(memmap_on_memory, "Enable memmap on memory for memory hotplug");
+#endif
+
/*
* online_page_callback contains pointer to current page onlining function.
* Initially it is generic_online_page(). If it is required it could be
@@ -648,9 +658,16 @@ static void online_pages_range(unsigned long start_pfn, unsigned long nr_pages)
* decide to not expose all pages to the buddy (e.g., expose them
* later). We account all pages as being online and belonging to this
* zone ("present").
+ * When using memmap_on_memory, the range might not be aligned to
+ * MAX_ORDER_NR_PAGES - 1, but pageblock aligned. __ffs() will detect
+ * this and the first chunk to online will be pageblock_nr_pages.
*/
- for (pfn = start_pfn; pfn < end_pfn; pfn += MAX_ORDER_NR_PAGES)
- (*online_page_callback)(pfn_to_page(pfn), MAX_ORDER - 1);
+ for (pfn = start_pfn; pfn < end_pfn;) {
+ int order = min(MAX_ORDER - 1UL, __ffs(pfn));
+
+ (*online_page_callback)(pfn_to_page(pfn), order);
+ pfn += (1UL << order);
+ }
/* mark all involved sections as online */
online_mem_sections(start_pfn, end_pfn);
@@ -817,7 +834,7 @@ static inline struct zone *default_zone_for_pfn(int nid, unsigned long start_pfn
return movable_node_enabled ? movable_zone : kernel_zone;
}
-struct zone * zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
+struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
unsigned long nr_pages)
{
if (online_type == MMOP_ONLINE_KERNEL)
@@ -829,24 +846,86 @@ struct zone * zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
return default_zone_for_pfn(nid, start_pfn, nr_pages);
}
-int __ref online_pages(unsigned long pfn, unsigned long nr_pages,
- int online_type, int nid)
+/*
+ * This function should only be called by memory_block_{online,offline},
+ * and {online,offline}_pages.
+ */
+void adjust_present_page_count(struct zone *zone, long nr_pages)
+{
+ unsigned long flags;
+
+ zone->present_pages += nr_pages;
+ pgdat_resize_lock(zone->zone_pgdat, &flags);
+ zone->zone_pgdat->node_present_pages += nr_pages;
+ pgdat_resize_unlock(zone->zone_pgdat, &flags);
+}
+
+int mhp_init_memmap_on_memory(unsigned long pfn, unsigned long nr_pages,
+ struct zone *zone)
+{
+ unsigned long end_pfn = pfn + nr_pages;
+ int ret;
+
+ ret = kasan_add_zero_shadow(__va(PFN_PHYS(pfn)), PFN_PHYS(nr_pages));
+ if (ret)
+ return ret;
+
+ move_pfn_range_to_zone(zone, pfn, nr_pages, NULL, MIGRATE_UNMOVABLE);
+
+ /*
+ * It might be that the vmemmap_pages fully span sections. If that is
+ * the case, mark those sections online here as otherwise they will be
+ * left offline.
+ */
+ if (nr_pages >= PAGES_PER_SECTION)
+ online_mem_sections(pfn, ALIGN_DOWN(end_pfn, PAGES_PER_SECTION));
+
+ return ret;
+}
+
+void mhp_deinit_memmap_on_memory(unsigned long pfn, unsigned long nr_pages)
+{
+ unsigned long end_pfn = pfn + nr_pages;
+
+ /*
+ * It might be that the vmemmap_pages fully span sections. If that is
+ * the case, mark those sections offline here as otherwise they will be
+ * left online.
+ */
+ if (nr_pages >= PAGES_PER_SECTION)
+ offline_mem_sections(pfn, ALIGN_DOWN(end_pfn, PAGES_PER_SECTION));
+
+ /*
+ * The pages associated with this vmemmap have been offlined, so
+ * we can reset its state here.
+ */
+ remove_pfn_range_from_zone(page_zone(pfn_to_page(pfn)), pfn, nr_pages);
+ kasan_remove_zero_shadow(__va(PFN_PHYS(pfn)), PFN_PHYS(nr_pages));
+}
+
+int __ref online_pages(unsigned long pfn, unsigned long nr_pages, struct zone *zone)
{
unsigned long flags;
- struct zone *zone;
int need_zonelists_rebuild = 0;
+ const int nid = zone_to_nid(zone);
int ret;
struct memory_notify arg;
- /* We can only online full sections (e.g., SECTION_IS_ONLINE) */
+ /*
+ * {on,off}lining is constrained to full memory sections (or more
+ * precisly to memory blocks from the user space POV).
+ * memmap_on_memory is an exception because it reserves initial part
+ * of the physical memory space for vmemmaps. That space is pageblock
+ * aligned.
+ */
if (WARN_ON_ONCE(!nr_pages ||
- !IS_ALIGNED(pfn | nr_pages, PAGES_PER_SECTION)))
+ !IS_ALIGNED(pfn, pageblock_nr_pages) ||
+ !IS_ALIGNED(pfn + nr_pages, PAGES_PER_SECTION)))
return -EINVAL;
mem_hotplug_begin();
/* associate pfn range with the zone */
- zone = zone_for_pfn_range(online_type, nid, pfn, nr_pages);
move_pfn_range_to_zone(zone, pfn, nr_pages, NULL, MIGRATE_ISOLATE);
arg.start_pfn = pfn;
@@ -877,11 +956,7 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages,
}
online_pages_range(pfn, nr_pages);
- zone->present_pages += nr_pages;
-
- pgdat_resize_lock(zone->zone_pgdat, &flags);
- zone->zone_pgdat->node_present_pages += nr_pages;
- pgdat_resize_unlock(zone->zone_pgdat, &flags);
+ adjust_present_page_count(zone, nr_pages);
node_states_set_node(nid, &arg);
if (need_zonelists_rebuild)
@@ -1064,6 +1139,45 @@ static int online_memory_block(struct memory_block *mem, void *arg)
return device_online(&mem->dev);
}
+bool mhp_supports_memmap_on_memory(unsigned long size)
+{
+ unsigned long nr_vmemmap_pages = size / PAGE_SIZE;
+ unsigned long vmemmap_size = nr_vmemmap_pages * sizeof(struct page);
+ unsigned long remaining_size = size - vmemmap_size;
+
+ /*
+ * Besides having arch support and the feature enabled at runtime, we
+ * need a few more assumptions to hold true:
+ *
+ * a) We span a single memory block: memory onlining/offlinin;g happens
+ * in memory block granularity. We don't want the vmemmap of online
+ * memory blocks to reside on offline memory blocks. In the future,
+ * we might want to support variable-sized memory blocks to make the
+ * feature more versatile.
+ *
+ * b) The vmemmap pages span complete PMDs: We don't want vmemmap code
+ * to populate memory from the altmap for unrelated parts (i.e.,
+ * other memory blocks)
+ *
+ * c) The vmemmap pages (and thereby the pages that will be exposed to
+ * the buddy) have to cover full pageblocks: memory onlining/offlining
+ * code requires applicable ranges to be page-aligned, for example, to
+ * set the migratetypes properly.
+ *
+ * TODO: Although we have a check here to make sure that vmemmap pages
+ * fully populate a PMD, it is not the right place to check for
+ * this. A much better solution involves improving vmemmap code
+ * to fallback to base pages when trying to populate vmemmap using
+ * altmap as an alternative source of memory, and we do not exactly
+ * populate a single PMD.
+ */
+ return memmap_on_memory &&
+ IS_ENABLED(CONFIG_MHP_MEMMAP_ON_MEMORY) &&
+ size == memory_block_size_bytes() &&
+ IS_ALIGNED(vmemmap_size, PMD_SIZE) &&
+ IS_ALIGNED(remaining_size, (pageblock_nr_pages << PAGE_SHIFT));
+}
+
/*
* NOTE: The caller must call lock_device_hotplug() to serialize hotplug
* and online/offline operations (triggered e.g. by sysfs).
@@ -1073,6 +1187,7 @@ static int online_memory_block(struct memory_block *mem, void *arg)
int __ref add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags)
{
struct mhp_params params = { .pgprot = pgprot_mhp(PAGE_KERNEL) };
+ struct vmem_altmap mhp_altmap = {};
u64 start, size;
bool new_node = false;
int ret;
@@ -1099,13 +1214,26 @@ int __ref add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags)
goto error;
new_node = ret;
+ /*
+ * Self hosted memmap array
+ */
+ if (mhp_flags & MHP_MEMMAP_ON_MEMORY) {
+ if (!mhp_supports_memmap_on_memory(size)) {
+ ret = -EINVAL;
+ goto error;
+ }
+ mhp_altmap.free = PHYS_PFN(size);
+ mhp_altmap.base_pfn = PHYS_PFN(start);
+ params.altmap = &mhp_altmap;
+ }
+
/* call arch's memory hotadd */
ret = arch_add_memory(nid, start, size, &params);
if (ret < 0)
goto error;
/* create memory block devices after memory was added */
- ret = create_memory_block_devices(start, size);
+ ret = create_memory_block_devices(start, size, mhp_altmap.alloc);
if (ret) {
arch_remove_memory(nid, start, size, NULL);
goto error;
@@ -1573,9 +1701,16 @@ int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages)
int ret, node;
char *reason;
- /* We can only offline full sections (e.g., SECTION_IS_ONLINE) */
+ /*
+ * {on,off}lining is constrained to full memory sections (or more
+ * precisly to memory blocks from the user space POV).
+ * memmap_on_memory is an exception because it reserves initial part
+ * of the physical memory space for vmemmaps. That space is pageblock
+ * aligned.
+ */
if (WARN_ON_ONCE(!nr_pages ||
- !IS_ALIGNED(start_pfn | nr_pages, PAGES_PER_SECTION)))
+ !IS_ALIGNED(start_pfn, pageblock_nr_pages) ||
+ !IS_ALIGNED(start_pfn + nr_pages, PAGES_PER_SECTION)))
return -EINVAL;
mem_hotplug_begin();
@@ -1611,6 +1746,7 @@ int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages)
* in a way that pages from isolated pageblock are left on pcplists.
*/
zone_pcp_disable(zone);
+ lru_cache_disable();
/* set above range as isolated */
ret = start_isolate_page_range(start_pfn, end_pfn,
@@ -1642,7 +1778,6 @@ int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages)
}
cond_resched();
- lru_add_drain_all();
ret = scan_movable_pages(pfn, end_pfn, &pfn);
if (!ret) {
@@ -1687,15 +1822,12 @@ int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages)
zone->nr_isolate_pageblock -= nr_pages / pageblock_nr_pages;
spin_unlock_irqrestore(&zone->lock, flags);
+ lru_cache_enable();
zone_pcp_enable(zone);
/* removal success */
adjust_managed_page_count(pfn_to_page(start_pfn), -nr_pages);
- zone->present_pages -= nr_pages;
-
- pgdat_resize_lock(zone->zone_pgdat, &flags);
- zone->zone_pgdat->node_present_pages -= nr_pages;
- pgdat_resize_unlock(zone->zone_pgdat, &flags);
+ adjust_present_page_count(zone, -nr_pages);
init_per_zone_wmark_min();
@@ -1750,6 +1882,14 @@ static int check_memblock_offlined_cb(struct memory_block *mem, void *arg)
return 0;
}
+static int get_nr_vmemmap_pages_cb(struct memory_block *mem, void *arg)
+{
+ /*
+ * If not set, continue with the next block.
+ */
+ return mem->nr_vmemmap_pages;
+}
+
static int check_cpu_on_node(pg_data_t *pgdat)
{
int cpu;
@@ -1824,6 +1964,9 @@ EXPORT_SYMBOL(try_offline_node);
static int __ref try_remove_memory(int nid, u64 start, u64 size)
{
int rc = 0;
+ struct vmem_altmap mhp_altmap = {};
+ struct vmem_altmap *altmap = NULL;
+ unsigned long nr_vmemmap_pages;
BUG_ON(check_hotplug_memory_range(start, size));
@@ -1836,6 +1979,31 @@ static int __ref try_remove_memory(int nid, u64 start, u64 size)
if (rc)
return rc;
+ /*
+ * We only support removing memory added with MHP_MEMMAP_ON_MEMORY in
+ * the same granularity it was added - a single memory block.
+ */
+ if (memmap_on_memory) {
+ nr_vmemmap_pages = walk_memory_blocks(start, size, NULL,
+ get_nr_vmemmap_pages_cb);
+ if (nr_vmemmap_pages) {
+ if (size != memory_block_size_bytes()) {
+ pr_warn("Refuse to remove %#llx - %#llx,"
+ "wrong granularity\n",
+ start, start + size);
+ return -EINVAL;
+ }
+
+ /*
+ * Let remove_pmd_table->free_hugepage_table do the
+ * right thing if we used vmem_altmap when hot-adding
+ * the range.
+ */
+ mhp_altmap.alloc = nr_vmemmap_pages;
+ altmap = &mhp_altmap;
+ }
+ }
+
/* remove memmap entry */
firmware_map_remove(start, start + size, "System RAM");
@@ -1847,7 +2015,7 @@ static int __ref try_remove_memory(int nid, u64 start, u64 size)
mem_hotplug_begin();
- arch_remove_memory(nid, start, size, NULL);
+ arch_remove_memory(nid, start, size, altmap);
if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) {
memblock_free(start, size);
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index cd0295567a04..3ebe2cfc64af 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -330,7 +330,7 @@ static void mpol_rebind_nodemask(struct mempolicy *pol, const nodemask_t *nodes)
else if (pol->flags & MPOL_F_RELATIVE_NODES)
mpol_relative_nodemask(&tmp, &pol->w.user_nodemask, nodes);
else {
- nodes_remap(tmp, pol->v.nodes,pol->w.cpuset_mems_allowed,
+ nodes_remap(tmp, pol->v.nodes, pol->w.cpuset_mems_allowed,
*nodes);
pol->w.cpuset_mems_allowed = *nodes;
}
@@ -1124,7 +1124,7 @@ int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from,
int err = 0;
nodemask_t tmp;
- migrate_prep();
+ lru_cache_disable();
mmap_read_lock(mm);
@@ -1161,7 +1161,7 @@ int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from,
tmp = *from;
while (!nodes_empty(tmp)) {
- int s,d;
+ int s, d;
int source = NUMA_NO_NODE;
int dest = 0;
@@ -1208,6 +1208,8 @@ int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from,
break;
}
mmap_read_unlock(mm);
+
+ lru_cache_enable();
if (err < 0)
return err;
return busy;
@@ -1323,7 +1325,7 @@ static long do_mbind(unsigned long start, unsigned long len,
if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) {
- migrate_prep();
+ lru_cache_disable();
}
{
NODEMASK_SCRATCH(scratch);
@@ -1371,6 +1373,8 @@ up_out:
mmap_write_unlock(mm);
mpol_out:
mpol_put(new);
+ if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
+ lru_cache_enable();
return err;
}
diff --git a/mm/mempool.c b/mm/mempool.c
index fe19d290a301..a258cf4de575 100644
--- a/mm/mempool.c
+++ b/mm/mempool.c
@@ -251,7 +251,7 @@ EXPORT_SYMBOL(mempool_init);
mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
mempool_free_t *free_fn, void *pool_data)
{
- return mempool_create_node(min_nr,alloc_fn,free_fn, pool_data,
+ return mempool_create_node(min_nr, alloc_fn, free_fn, pool_data,
GFP_KERNEL, NUMA_NO_NODE);
}
EXPORT_SYMBOL(mempool_create);
diff --git a/mm/migrate.c b/mm/migrate.c
index 47df0df8f21a..6b37d00890ca 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -57,28 +57,6 @@
#include "internal.h"
-/*
- * migrate_prep() needs to be called before we start compiling a list of pages
- * to be migrated using isolate_lru_page(). If scheduling work on other CPUs is
- * undesirable, use migrate_prep_local()
- */
-void migrate_prep(void)
-{
- /*
- * Clear the LRU lists so pages can be isolated.
- * Note that pages may be moved off the LRU after we have
- * drained them. Those pages will fail to migrate like other
- * pages that may be busy.
- */
- lru_add_drain_all();
-}
-
-/* Do the necessary work of migrate_prep but not if it involves other CPUs */
-void migrate_prep_local(void)
-{
- lru_add_drain();
-}
-
int isolate_movable_page(struct page *page, isolate_mode_t mode)
{
struct address_space *mapping;
@@ -140,15 +118,10 @@ out:
return -EBUSY;
}
-/* It should be called on page which is PG_movable */
-void putback_movable_page(struct page *page)
+static void putback_movable_page(struct page *page)
{
struct address_space *mapping;
- VM_BUG_ON_PAGE(!PageLocked(page), page);
- VM_BUG_ON_PAGE(!PageMovable(page), page);
- VM_BUG_ON_PAGE(!PageIsolated(page), page);
-
mapping = page_mapping(page);
mapping->a_ops->putback_page(page);
__ClearPageIsolated(page);
@@ -1375,7 +1348,7 @@ out_unlock:
out:
if (rc == MIGRATEPAGE_SUCCESS)
putback_active_hugepage(hpage);
- else if (rc != -EAGAIN && rc != MIGRATEPAGE_SUCCESS)
+ else if (rc != -EAGAIN)
list_move_tail(&hpage->lru, ret);
/*
@@ -1445,6 +1418,8 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
int rc, nr_subpages;
LIST_HEAD(ret_pages);
+ trace_mm_migrate_pages_start(mode, reason);
+
if (!swapwrite)
current->flags |= PF_SWAPWRITE;
@@ -1769,7 +1744,7 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes,
int start, i;
int err = 0, err1;
- migrate_prep();
+ lru_cache_disable();
for (i = start = 0; i < nr_pages; i++) {
const void __user *p;
@@ -1838,6 +1813,7 @@ out_flush:
if (err >= 0)
err = err1;
out:
+ lru_cache_enable();
return err;
}
@@ -2110,17 +2086,6 @@ bool pmd_trans_migrating(pmd_t pmd)
return PageLocked(page);
}
-static inline bool is_shared_exec_page(struct vm_area_struct *vma,
- struct page *page)
-{
- if (page_mapcount(page) != 1 &&
- (page_is_file_lru(page) || vma_is_shmem(vma)) &&
- (vma->vm_flags & VM_EXEC))
- return true;
-
- return false;
-}
-
/*
* Attempt to migrate a misplaced page to the specified destination
* node. Caller is expected to have an elevated reference count on
@@ -2138,7 +2103,8 @@ int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma,
* Don't migrate file pages that are mapped in multiple processes
* with execute permissions as they are probably shared libraries.
*/
- if (is_shared_exec_page(vma, page))
+ if (page_mapcount(page) != 1 && page_is_file_lru(page) &&
+ (vma->vm_flags & VM_EXEC))
goto out;
/*
@@ -2193,9 +2159,6 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm,
int page_lru = page_is_file_lru(page);
unsigned long start = address & HPAGE_PMD_MASK;
- if (is_shared_exec_page(vma, page))
- goto out;
-
new_page = alloc_pages_node(node,
(GFP_TRANSHUGE_LIGHT | __GFP_THISNODE),
HPAGE_PMD_ORDER);
@@ -2307,7 +2270,6 @@ out_fail:
out_unlock:
unlock_page(page);
-out:
put_page(page);
return 0;
}
@@ -2316,44 +2278,38 @@ out:
#endif /* CONFIG_NUMA */
#ifdef CONFIG_DEVICE_PRIVATE
-static int migrate_vma_collect_hole(unsigned long start,
+static int migrate_vma_collect_skip(unsigned long start,
unsigned long end,
- __always_unused int depth,
struct mm_walk *walk)
{
struct migrate_vma *migrate = walk->private;
unsigned long addr;
- /* Only allow populating anonymous memory. */
- if (!vma_is_anonymous(walk->vma)) {
- for (addr = start; addr < end; addr += PAGE_SIZE) {
- migrate->src[migrate->npages] = 0;
- migrate->dst[migrate->npages] = 0;
- migrate->npages++;
- }
- return 0;
- }
-
for (addr = start; addr < end; addr += PAGE_SIZE) {
- migrate->src[migrate->npages] = MIGRATE_PFN_MIGRATE;
migrate->dst[migrate->npages] = 0;
- migrate->npages++;
- migrate->cpages++;
+ migrate->src[migrate->npages++] = 0;
}
return 0;
}
-static int migrate_vma_collect_skip(unsigned long start,
+static int migrate_vma_collect_hole(unsigned long start,
unsigned long end,
+ __always_unused int depth,
struct mm_walk *walk)
{
struct migrate_vma *migrate = walk->private;
unsigned long addr;
+ /* Only allow populating anonymous memory. */
+ if (!vma_is_anonymous(walk->vma))
+ return migrate_vma_collect_skip(start, end, walk);
+
for (addr = start; addr < end; addr += PAGE_SIZE) {
+ migrate->src[migrate->npages] = MIGRATE_PFN_MIGRATE;
migrate->dst[migrate->npages] = 0;
- migrate->src[migrate->npages++] = 0;
+ migrate->npages++;
+ migrate->cpages++;
}
return 0;
@@ -2973,6 +2929,13 @@ static void migrate_vma_insert_page(struct migrate_vma *migrate,
swp_entry = make_device_private_entry(page, vma->vm_flags & VM_WRITE);
entry = swp_entry_to_pte(swp_entry);
+ } else {
+ /*
+ * For now we only support migrating to un-addressable
+ * device memory.
+ */
+ pr_warn_once("Unsupported ZONE_DEVICE page type.\n");
+ goto abort;
}
} else {
entry = mk_pte(page, vma->vm_page_prot);
diff --git a/mm/mlock.c b/mm/mlock.c
index f8f8cc32d03d..df590fda5688 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -559,7 +559,7 @@ static int apply_vma_lock_flags(unsigned long start, size_t len,
vm_flags_t flags)
{
unsigned long nstart, end, tmp;
- struct vm_area_struct * vma, * prev;
+ struct vm_area_struct *vma, *prev;
int error;
VM_BUG_ON(offset_in_page(start));
@@ -737,7 +737,7 @@ SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len)
*/
static int apply_mlockall_flags(int flags)
{
- struct vm_area_struct * vma, * prev = NULL;
+ struct vm_area_struct *vma, *prev = NULL;
vm_flags_t to_add = 0;
current->mm->def_flags &= VM_LOCKED_CLEAR_MASK;
diff --git a/mm/mmap.c b/mm/mmap.c
index 347ef9b83bb5..c1b848fa7da6 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3029,25 +3029,9 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
flags &= MAP_NONBLOCK;
flags |= MAP_SHARED | MAP_FIXED | MAP_POPULATE;
- if (vma->vm_flags & VM_LOCKED) {
- struct vm_area_struct *tmp;
+ if (vma->vm_flags & VM_LOCKED)
flags |= MAP_LOCKED;
- /* drop PG_Mlocked flag for over-mapped range */
- for (tmp = vma; tmp->vm_start >= start + size;
- tmp = tmp->vm_next) {
- /*
- * Split pmd and munlock page on the border
- * of the range.
- */
- vma_adjust_trans_huge(tmp, start, start + size, 0);
-
- munlock_vma_pages_range(tmp,
- max(tmp->vm_start, start),
- min(tmp->vm_end, start + size));
- }
- }
-
file = get_file(vma->vm_file);
ret = do_mmap(vma->vm_file, start, size,
prot, flags, pgoff, &populate, NULL);
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index fa1cf18bac97..3df2ac6b8686 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -993,7 +993,7 @@ static void oom_kill_process(struct oom_control *oc, const char *message)
if (oom_group) {
mem_cgroup_print_oom_group(oom_group);
mem_cgroup_scan_tasks(oom_group, oom_kill_memcg_member,
- (void*)message);
+ (void *)message);
mem_cgroup_put(oom_group);
}
}
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6b208b1843bf..bcdc0c6f21f1 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3859,16 +3859,13 @@ alloc_flags_nofragment(struct zone *zone, gfp_t gfp_mask)
return alloc_flags;
}
-static inline unsigned int current_alloc_flags(gfp_t gfp_mask,
- unsigned int alloc_flags)
+/* Must be called after current_gfp_context() which can change gfp_mask */
+static inline unsigned int gfp_to_alloc_flags_cma(gfp_t gfp_mask,
+ unsigned int alloc_flags)
{
#ifdef CONFIG_CMA
- unsigned int pflags = current->flags;
-
- if (!(pflags & PF_MEMALLOC_NOCMA) &&
- gfp_migratetype(gfp_mask) == MIGRATE_MOVABLE)
+ if (gfp_migratetype(gfp_mask) == MIGRATE_MOVABLE)
alloc_flags |= ALLOC_CMA;
-
#endif
return alloc_flags;
}
@@ -3968,7 +3965,7 @@ retry:
if (alloc_flags & ALLOC_NO_WATERMARKS)
goto try_this_zone;
- if (node_reclaim_mode == 0 ||
+ if (!node_reclaim_enabled() ||
!zone_allows_reclaim(ac->preferred_zoneref->zone, zone))
continue;
@@ -4204,6 +4201,8 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
memalloc_noreclaim_restore(noreclaim_flag);
psi_memstall_leave(&pflags);
+ if (*compact_result == COMPACT_SKIPPED)
+ return NULL;
/*
* At least in one zone compaction wasn't deferred or skipped, so let's
* count a compaction stall
@@ -4524,7 +4523,7 @@ gfp_to_alloc_flags(gfp_t gfp_mask)
} else if (unlikely(rt_task(current)) && !in_interrupt())
alloc_flags |= ALLOC_HARDER;
- alloc_flags = current_alloc_flags(gfp_mask, alloc_flags);
+ alloc_flags = gfp_to_alloc_flags_cma(gfp_mask, alloc_flags);
return alloc_flags;
}
@@ -4826,7 +4825,7 @@ retry:
reserve_flags = __gfp_pfmemalloc_flags(gfp_mask);
if (reserve_flags)
- alloc_flags = current_alloc_flags(gfp_mask, reserve_flags);
+ alloc_flags = gfp_to_alloc_flags_cma(gfp_mask, reserve_flags);
/*
* Reset the nodemask and zonelist iterators if memory policies can be
@@ -4995,7 +4994,7 @@ static inline bool prepare_alloc_pages(gfp_t gfp_mask, unsigned int order,
if (should_fail_alloc_page(gfp_mask, order))
return false;
- *alloc_flags = current_alloc_flags(gfp_mask, *alloc_flags);
+ *alloc_flags = gfp_to_alloc_flags_cma(gfp_mask, *alloc_flags);
/* Dirty zone balancing only done in the fast path */
ac->spread_dirty_pages = (gfp_mask & __GFP_WRITE);
@@ -5178,6 +5177,14 @@ struct page *__alloc_pages(gfp_t gfp, unsigned int order, int preferred_nid,
}
gfp &= gfp_allowed_mask;
+ /*
+ * Apply scoped allocation constraints. This is mainly about GFP_NOFS
+ * resp. GFP_NOIO which has to be inherited for all allocation requests
+ * from a particular context which has been marked by
+ * memalloc_no{fs,io}_{save,restore}. And PF_MEMALLOC_PIN which ensures
+ * movable zones are not used during allocation.
+ */
+ gfp = current_gfp_context(gfp);
alloc_gfp = gfp;
if (!prepare_alloc_pages(gfp, order, preferred_nid, nodemask, &ac,
&alloc_gfp, &alloc_flags))
@@ -5194,13 +5201,7 @@ struct page *__alloc_pages(gfp_t gfp, unsigned int order, int preferred_nid,
if (likely(page))
goto out;
- /*
- * Apply scoped allocation constraints. This is mainly about GFP_NOFS
- * resp. GFP_NOIO which has to be inherited for all allocation requests
- * from a particular context which has been marked by
- * memalloc_no{fs,io}_{save,restore}.
- */
- alloc_gfp = current_gfp_context(gfp);
+ alloc_gfp = gfp;
ac.spread_dirty_pages = false;
/*
@@ -8679,7 +8680,7 @@ static int __alloc_contig_migrate_range(struct compact_control *cc,
.gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL,
};
- migrate_prep();
+ lru_cache_disable();
while (pfn < end || !list_empty(&cc->migratepages)) {
if (fatal_signal_pending(current)) {
@@ -8689,14 +8690,13 @@ static int __alloc_contig_migrate_range(struct compact_control *cc,
if (list_empty(&cc->migratepages)) {
cc->nr_migratepages = 0;
- pfn = isolate_migratepages_range(cc, pfn, end);
- if (!pfn) {
- ret = -EINTR;
+ ret = isolate_migratepages_range(cc, pfn, end);
+ if (ret && ret != -EAGAIN)
break;
- }
+ pfn = cc->migrate_pfn;
tries = 0;
} else if (++tries == 5) {
- ret = ret < 0 ? ret : -EBUSY;
+ ret = -EBUSY;
break;
}
@@ -8706,7 +8706,16 @@ static int __alloc_contig_migrate_range(struct compact_control *cc,
ret = migrate_pages(&cc->migratepages, alloc_migration_target,
NULL, (unsigned long)&mtc, cc->mode, MR_CONTIG_RANGE);
+
+ /*
+ * On -ENOMEM, migrate_pages() bails out right away. It is pointless
+ * to retry again over this error, so do the same here.
+ */
+ if (ret == -ENOMEM)
+ break;
}
+
+ lru_cache_enable();
if (ret < 0) {
alloc_contig_dump_pages(&cc->migratepages);
putback_movable_pages(&cc->migratepages);
@@ -8799,7 +8808,7 @@ int alloc_contig_range(unsigned long start, unsigned long end,
ret = __alloc_contig_migrate_range(&cc, start, end);
if (ret && ret != -EBUSY)
goto done;
- ret =0;
+ ret = 0;
/*
* Pages from [start, end) are within a MAX_ORDER_NR_PAGES
@@ -8892,12 +8901,6 @@ static bool pfn_range_valid_contig(struct zone *z, unsigned long start_pfn,
if (PageReserved(page))
return false;
-
- if (page_count(page) > 0)
- return false;
-
- if (PageHuge(page))
- return false;
}
return true;
}
@@ -8969,9 +8972,9 @@ struct page *alloc_contig_pages(unsigned long nr_pages, gfp_t gfp_mask,
}
#endif /* CONFIG_CONTIG_ALLOC */
-void free_contig_range(unsigned long pfn, unsigned int nr_pages)
+void free_contig_range(unsigned long pfn, unsigned long nr_pages)
{
- unsigned int count = 0;
+ unsigned long count = 0;
for (; nr_pages--; pfn++) {
struct page *page = pfn_to_page(pfn);
@@ -8979,7 +8982,7 @@ void free_contig_range(unsigned long pfn, unsigned int nr_pages)
count += page_count(page) != 1;
__free_page(page);
}
- WARN(count != 0, "%d pages are still in use!\n", count);
+ WARN(count != 0, "%lu pages are still in use!\n", count);
}
EXPORT_SYMBOL(free_contig_range);
@@ -9017,12 +9020,9 @@ void zone_pcp_enable(struct zone *zone)
void zone_pcp_reset(struct zone *zone)
{
- unsigned long flags;
int cpu;
struct per_cpu_pageset *pset;
- /* avoid races with drain_pages() */
- local_irq_save(flags);
if (zone->pageset != &boot_pageset) {
for_each_online_cpu(cpu) {
pset = per_cpu_ptr(zone->pageset, cpu);
@@ -9031,7 +9031,6 @@ void zone_pcp_reset(struct zone *zone)
free_percpu(zone->pageset);
zone->pageset = &boot_pageset;
}
- local_irq_restore(flags);
}
#ifdef CONFIG_MEMORY_HOTREMOVE
diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c
index f5fee9cf90f8..4bcc11958089 100644
--- a/mm/process_vm_access.c
+++ b/mm/process_vm_access.c
@@ -9,7 +9,6 @@
#include <linux/mm.h>
#include <linux/uio.h>
#include <linux/sched.h>
-#include <linux/compat.h>
#include <linux/sched/mm.h>
#include <linux/highmem.h>
#include <linux/ptrace.h>
diff --git a/mm/shmem.c b/mm/shmem.c
index 162d8f8993bb..a08cedefbfaa 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -3508,7 +3508,7 @@ static int shmem_parse_options(struct fs_context *fc, void *data)
}
}
if (*this_char) {
- char *value = strchr(this_char,'=');
+ char *value = strchr(this_char, '=');
size_t len = 0;
int err;
diff --git a/mm/sparse.c b/mm/sparse.c
index 33406ea2ecc4..b2ada9dc00cb 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -257,7 +257,7 @@ static void __init memory_present(int nid, unsigned long start, unsigned long en
if (unlikely(!mem_section)) {
unsigned long size, align;
- size = sizeof(struct mem_section*) * NR_SECTION_ROOTS;
+ size = sizeof(struct mem_section *) * NR_SECTION_ROOTS;
align = 1 << (INTERNODE_CACHE_SHIFT);
mem_section = memblock_alloc(size, align);
if (!mem_section)
@@ -624,7 +624,6 @@ void online_mem_sections(unsigned long start_pfn, unsigned long end_pfn)
}
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
/* Mark all memory sections within the pfn range as offline */
void offline_mem_sections(unsigned long start_pfn, unsigned long end_pfn)
{
@@ -645,7 +644,6 @@ void offline_mem_sections(unsigned long start_pfn, unsigned long end_pfn)
ms->section_mem_map &= ~SECTION_IS_ONLINE;
}
}
-#endif
#ifdef CONFIG_SPARSEMEM_VMEMMAP
static struct page * __meminit populate_section_memmap(unsigned long pfn,
diff --git a/mm/swap.c b/mm/swap.c
index 31b844d4ed94..a75a8265302b 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -36,6 +36,7 @@
#include <linux/hugetlb.h>
#include <linux/page_idle.h>
#include <linux/local_lock.h>
+#include <linux/buffer_head.h>
#include "internal.h"
@@ -235,6 +236,18 @@ static void pagevec_move_tail_fn(struct page *page, struct lruvec *lruvec)
}
}
+/* return true if pagevec needs to drain */
+static bool pagevec_add_and_need_flush(struct pagevec *pvec, struct page *page)
+{
+ bool ret = false;
+
+ if (!pagevec_add(pvec, page) || PageCompound(page) ||
+ lru_cache_disabled())
+ ret = true;
+
+ return ret;
+}
+
/*
* Writeback is about to end against a page which has been marked for immediate
* reclaim. If it still appears to be reclaimable, move it to the tail of the
@@ -252,7 +265,7 @@ void rotate_reclaimable_page(struct page *page)
get_page(page);
local_lock_irqsave(&lru_rotate.lock, flags);
pvec = this_cpu_ptr(&lru_rotate.pvec);
- if (!pagevec_add(pvec, page) || PageCompound(page))
+ if (pagevec_add_and_need_flush(pvec, page))
pagevec_lru_move_fn(pvec, pagevec_move_tail_fn);
local_unlock_irqrestore(&lru_rotate.lock, flags);
}
@@ -343,7 +356,7 @@ static void activate_page(struct page *page)
local_lock(&lru_pvecs.lock);
pvec = this_cpu_ptr(&lru_pvecs.activate_page);
get_page(page);
- if (!pagevec_add(pvec, page) || PageCompound(page))
+ if (pagevec_add_and_need_flush(pvec, page))
pagevec_lru_move_fn(pvec, __activate_page);
local_unlock(&lru_pvecs.lock);
}
@@ -458,7 +471,7 @@ void lru_cache_add(struct page *page)
get_page(page);
local_lock(&lru_pvecs.lock);
pvec = this_cpu_ptr(&lru_pvecs.lru_add);
- if (!pagevec_add(pvec, page) || PageCompound(page))
+ if (pagevec_add_and_need_flush(pvec, page))
__pagevec_lru_add(pvec);
local_unlock(&lru_pvecs.lock);
}
@@ -629,6 +642,7 @@ void lru_add_drain_cpu(int cpu)
pagevec_lru_move_fn(pvec, lru_lazyfree_fn);
activate_page_drain(cpu);
+ invalidate_bh_lrus_cpu(cpu);
}
/**
@@ -654,7 +668,7 @@ void deactivate_file_page(struct page *page)
local_lock(&lru_pvecs.lock);
pvec = this_cpu_ptr(&lru_pvecs.lru_deactivate_file);
- if (!pagevec_add(pvec, page) || PageCompound(page))
+ if (pagevec_add_and_need_flush(pvec, page))
pagevec_lru_move_fn(pvec, lru_deactivate_file_fn);
local_unlock(&lru_pvecs.lock);
}
@@ -676,7 +690,7 @@ void deactivate_page(struct page *page)
local_lock(&lru_pvecs.lock);
pvec = this_cpu_ptr(&lru_pvecs.lru_deactivate);
get_page(page);
- if (!pagevec_add(pvec, page) || PageCompound(page))
+ if (pagevec_add_and_need_flush(pvec, page))
pagevec_lru_move_fn(pvec, lru_deactivate_fn);
local_unlock(&lru_pvecs.lock);
}
@@ -698,7 +712,7 @@ void mark_page_lazyfree(struct page *page)
local_lock(&lru_pvecs.lock);
pvec = this_cpu_ptr(&lru_pvecs.lru_lazyfree);
get_page(page);
- if (!pagevec_add(pvec, page) || PageCompound(page))
+ if (pagevec_add_and_need_flush(pvec, page))
pagevec_lru_move_fn(pvec, lru_lazyfree_fn);
local_unlock(&lru_pvecs.lock);
}
@@ -735,7 +749,7 @@ static void lru_add_drain_per_cpu(struct work_struct *dummy)
* Calling this function with cpu hotplug locks held can actually lead
* to obscure indirect dependencies via WQ context.
*/
-void lru_add_drain_all(void)
+inline void __lru_add_drain_all(bool force_all_cpus)
{
/*
* lru_drain_gen - Global pages generation number
@@ -780,7 +794,7 @@ void lru_add_drain_all(void)
* (C) Exit the draining operation if a newer generation, from another
* lru_add_drain_all(), was already scheduled for draining. Check (A).
*/
- if (unlikely(this_gen != lru_drain_gen))
+ if (unlikely(this_gen != lru_drain_gen && !force_all_cpus))
goto done;
/*
@@ -810,12 +824,14 @@ void lru_add_drain_all(void)
for_each_online_cpu(cpu) {
struct work_struct *work = &per_cpu(lru_add_drain_work, cpu);
- if (pagevec_count(&per_cpu(lru_pvecs.lru_add, cpu)) ||
+ if (force_all_cpus ||
+ pagevec_count(&per_cpu(lru_pvecs.lru_add, cpu)) ||
data_race(pagevec_count(&per_cpu(lru_rotate.pvec, cpu))) ||
pagevec_count(&per_cpu(lru_pvecs.lru_deactivate_file, cpu)) ||
pagevec_count(&per_cpu(lru_pvecs.lru_deactivate, cpu)) ||
pagevec_count(&per_cpu(lru_pvecs.lru_lazyfree, cpu)) ||
- need_activate_page_drain(cpu)) {
+ need_activate_page_drain(cpu) ||
+ has_bh_in_lru(cpu, NULL)) {
INIT_WORK(work, lru_add_drain_per_cpu);
queue_work_on(cpu, mm_percpu_wq, work);
__cpumask_set_cpu(cpu, &has_work);
@@ -828,6 +844,11 @@ void lru_add_drain_all(void)
done:
mutex_unlock(&lock);
}
+
+void lru_add_drain_all(void)
+{
+ __lru_add_drain_all(false);
+}
#else
void lru_add_drain_all(void)
{
@@ -835,6 +856,34 @@ void lru_add_drain_all(void)
}
#endif /* CONFIG_SMP */
+atomic_t lru_disable_count = ATOMIC_INIT(0);
+
+/*
+ * lru_cache_disable() needs to be called before we start compiling
+ * a list of pages to be migrated using isolate_lru_page().
+ * It drains pages on LRU cache and then disable on all cpus until
+ * lru_cache_enable is called.
+ *
+ * Must be paired with a call to lru_cache_enable().
+ */
+void lru_cache_disable(void)
+{
+ atomic_inc(&lru_disable_count);
+#ifdef CONFIG_SMP
+ /*
+ * lru_add_drain_all in the force mode will schedule draining on
+ * all online CPUs so any calls of lru_cache_disabled wrapped by
+ * local_lock or preemption disabled would be ordered by that.
+ * The atomic operation doesn't need to have stronger ordering
+ * requirements because that is enforeced by the scheduling
+ * guarantees.
+ */
+ __lru_add_drain_all(true);
+#else
+ lru_add_drain();
+#endif
+}
+
/**
* release_pages - batched put_page()
* @pages: array of pages to release
diff --git a/mm/swap_state.c b/mm/swap_state.c
index fb7efa08fe57..3a1259c13f3b 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -132,7 +132,6 @@ int add_to_swap_cache(struct page *page, swp_entry_t entry,
xas_store(&xas, page);
xas_next(&xas);
}
- address_space->nrexceptional -= nr_shadows;
address_space->nrpages += nr;
__mod_node_page_state(page_pgdat(page), NR_FILE_PAGES, nr);
__mod_lruvec_page_state(page, NR_SWAPCACHE, nr);
@@ -172,8 +171,6 @@ void __delete_from_swap_cache(struct page *page,
xas_next(&xas);
}
ClearPageSwapCache(page);
- if (shadow)
- address_space->nrexceptional += nr;
address_space->nrpages -= nr;
__mod_node_page_state(page_pgdat(page), NR_FILE_PAGES, -nr);
__mod_lruvec_page_state(page, NR_SWAPCACHE, -nr);
@@ -275,7 +272,6 @@ void clear_shadow_from_swap_cache(int type, unsigned long begin,
xas_store(&xas, NULL);
nr_shadows++;
}
- address_space->nrexceptional -= nr_shadows;
xa_unlock_irq(&address_space->i_pages);
/* search the next swapcache until we meet end */
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 084a5b9a18e5..149e77454e3c 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -2780,7 +2780,7 @@ static int swap_show(struct seq_file *swap, void *v)
unsigned int bytes, inuse;
if (si == SEQ_START_TOKEN) {
- seq_puts(swap,"Filename\t\t\t\tType\t\tSize\t\tUsed\t\tPriority\n");
+ seq_puts(swap, "Filename\t\t\t\tType\t\tSize\t\tUsed\t\tPriority\n");
return 0;
}
@@ -3284,7 +3284,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
sizeof(long),
GFP_KERNEL);
- if (p->bdev &&(swap_flags & SWAP_FLAG_DISCARD) && swap_discardable(p)) {
+ if (p->bdev && (swap_flags & SWAP_FLAG_DISCARD) && swap_discardable(p)) {
/*
* When discard is enabled for swap with no particular
* policy flagged, we set all swap discard flags here in
diff --git a/mm/truncate.c b/mm/truncate.c
index 455944264663..95af244b112a 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -40,7 +40,6 @@ static inline void __clear_shadow_entry(struct address_space *mapping,
if (xas_load(&xas) != entry)
return;
xas_store(&xas, NULL);
- mapping->nrexceptional--;
}
static void clear_shadow_entry(struct address_space *mapping, pgoff_t index,
@@ -295,7 +294,7 @@ void truncate_inode_pages_range(struct address_space *mapping,
pgoff_t index;
int i;
- if (mapping->nrpages == 0 && mapping->nrexceptional == 0)
+ if (mapping_empty(mapping))
goto out;
/* Offsets within partial pages */
@@ -440,9 +439,6 @@ EXPORT_SYMBOL(truncate_inode_pages);
*/
void truncate_inode_pages_final(struct address_space *mapping)
{
- unsigned long nrexceptional;
- unsigned long nrpages;
-
/*
* Page reclaim can not participate in regular inode lifetime
* management (can't call iput()) and thus can race with the
@@ -452,16 +448,7 @@ void truncate_inode_pages_final(struct address_space *mapping)
*/
mapping_set_exiting(mapping);
- /*
- * When reclaim installs eviction entries, it increases
- * nrexceptional first, then decreases nrpages. Make sure we see
- * this in the right order or we might miss an entry.
- */
- nrpages = mapping->nrpages;
- smp_rmb();
- nrexceptional = mapping->nrexceptional;
-
- if (nrpages || nrexceptional) {
+ if (!mapping_empty(mapping)) {
/*
* As truncation uses a lockless tree lookup, cycle
* the tree lock to make sure any ongoing tree
@@ -633,7 +620,7 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
int ret2 = 0;
int did_range_unmap = 0;
- if (mapping->nrpages == 0 && mapping->nrexceptional == 0)
+ if (mapping_empty(mapping))
goto out;
pagevec_init(&pvec);
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index 9a3d451402d7..e14b3820c6a8 100644
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -207,7 +207,7 @@ static __always_inline ssize_t __mcopy_atomic_hugetlb(struct mm_struct *dst_mm,
unsigned long dst_start,
unsigned long src_start,
unsigned long len,
- bool zeropage)
+ enum mcopy_atomic_mode mode)
{
int vm_alloc_shared = dst_vma->vm_flags & VM_SHARED;
int vm_shared = dst_vma->vm_flags & VM_SHARED;
@@ -227,7 +227,7 @@ static __always_inline ssize_t __mcopy_atomic_hugetlb(struct mm_struct *dst_mm,
* by THP. Since we can not reliably insert a zero page, this
* feature is not supported.
*/
- if (zeropage) {
+ if (mode == MCOPY_ATOMIC_ZEROPAGE) {
mmap_read_unlock(dst_mm);
return -EINVAL;
}
@@ -273,8 +273,6 @@ retry:
}
while (src_addr < src_start + len) {
- pte_t dst_pteval;
-
BUG_ON(dst_addr >= dst_start + len);
/*
@@ -290,23 +288,23 @@ retry:
mutex_lock(&hugetlb_fault_mutex_table[hash]);
err = -ENOMEM;
- dst_pte = huge_pte_alloc(dst_mm, dst_addr, vma_hpagesize);
+ dst_pte = huge_pte_alloc(dst_mm, dst_vma, dst_addr, vma_hpagesize);
if (!dst_pte) {
mutex_unlock(&hugetlb_fault_mutex_table[hash]);
i_mmap_unlock_read(mapping);
goto out_unlock;
}
- err = -EEXIST;
- dst_pteval = huge_ptep_get(dst_pte);
- if (!huge_pte_none(dst_pteval)) {
+ if (mode != MCOPY_ATOMIC_CONTINUE &&
+ !huge_pte_none(huge_ptep_get(dst_pte))) {
+ err = -EEXIST;
mutex_unlock(&hugetlb_fault_mutex_table[hash]);
i_mmap_unlock_read(mapping);
goto out_unlock;
}
err = hugetlb_mcopy_atomic_pte(dst_mm, dst_pte, dst_vma,
- dst_addr, src_addr, &page);
+ dst_addr, src_addr, mode, &page);
mutex_unlock(&hugetlb_fault_mutex_table[hash]);
i_mmap_unlock_read(mapping);
@@ -408,7 +406,7 @@ extern ssize_t __mcopy_atomic_hugetlb(struct mm_struct *dst_mm,
unsigned long dst_start,
unsigned long src_start,
unsigned long len,
- bool zeropage);
+ enum mcopy_atomic_mode mode);
#endif /* CONFIG_HUGETLB_PAGE */
static __always_inline ssize_t mfill_atomic_pte(struct mm_struct *dst_mm,
@@ -458,7 +456,7 @@ static __always_inline ssize_t __mcopy_atomic(struct mm_struct *dst_mm,
unsigned long dst_start,
unsigned long src_start,
unsigned long len,
- bool zeropage,
+ enum mcopy_atomic_mode mcopy_mode,
bool *mmap_changing,
__u64 mode)
{
@@ -469,6 +467,7 @@ static __always_inline ssize_t __mcopy_atomic(struct mm_struct *dst_mm,
long copied;
struct page *page;
bool wp_copy;
+ bool zeropage = (mcopy_mode == MCOPY_ATOMIC_ZEROPAGE);
/*
* Sanitize the command parameters:
@@ -527,10 +526,12 @@ retry:
*/
if (is_vm_hugetlb_page(dst_vma))
return __mcopy_atomic_hugetlb(dst_mm, dst_vma, dst_start,
- src_start, len, zeropage);
+ src_start, len, mcopy_mode);
if (!vma_is_anonymous(dst_vma) && !vma_is_shmem(dst_vma))
goto out_unlock;
+ if (mcopy_mode == MCOPY_ATOMIC_CONTINUE)
+ goto out_unlock;
/*
* Ensure the dst_vma has a anon_vma or this page
@@ -626,14 +627,22 @@ ssize_t mcopy_atomic(struct mm_struct *dst_mm, unsigned long dst_start,
unsigned long src_start, unsigned long len,
bool *mmap_changing, __u64 mode)
{
- return __mcopy_atomic(dst_mm, dst_start, src_start, len, false,
- mmap_changing, mode);
+ return __mcopy_atomic(dst_mm, dst_start, src_start, len,
+ MCOPY_ATOMIC_NORMAL, mmap_changing, mode);
}
ssize_t mfill_zeropage(struct mm_struct *dst_mm, unsigned long start,
unsigned long len, bool *mmap_changing)
{
- return __mcopy_atomic(dst_mm, start, 0, len, true, mmap_changing, 0);
+ return __mcopy_atomic(dst_mm, start, 0, len, MCOPY_ATOMIC_ZEROPAGE,
+ mmap_changing, 0);
+}
+
+ssize_t mcopy_continue(struct mm_struct *dst_mm, unsigned long start,
+ unsigned long len, bool *mmap_changing)
+{
+ return __mcopy_atomic(dst_mm, start, 0, len, MCOPY_ATOMIC_CONTINUE,
+ mmap_changing, 0);
}
int mwriteprotect_range(struct mm_struct *dst_mm, unsigned long start,
diff --git a/mm/util.c b/mm/util.c
index 083c5c417cfc..a8bf17f18a81 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -765,7 +765,7 @@ int overcommit_policy_handler(struct ctl_table *table, int write, void *buffer,
* The deviation of sync_overcommit_as could be big with loose policy
* like OVERCOMMIT_ALWAYS/OVERCOMMIT_GUESS. When changing policy to
* strict OVERCOMMIT_NEVER, we need to reduce the deviation to comply
- * with the strict "NEVER", and to avoid possible race condtion (even
+ * with the strict "NEVER", and to avoid possible race condition (even
* though user usually won't too frequently do the switching to policy
* OVERCOMMIT_NEVER), the switch is done in the following order:
* 1. changing the batch
@@ -987,22 +987,26 @@ int __weak memcmp_pages(struct page *page1, struct page *page2)
*/
void mem_dump_obj(void *object)
{
+ const char *type;
+
if (kmem_valid_obj(object)) {
kmem_dump_obj(object);
return;
}
+
if (vmalloc_dump_obj(object))
return;
- if (!virt_addr_valid(object)) {
- if (object == NULL)
- pr_cont(" NULL pointer.\n");
- else if (object == ZERO_SIZE_PTR)
- pr_cont(" zero-size pointer.\n");
- else
- pr_cont(" non-paged memory.\n");
- return;
- }
- pr_cont(" non-slab/vmalloc memory.\n");
+
+ if (virt_addr_valid(object))
+ type = "non-slab/vmalloc memory";
+ else if (object == NULL)
+ type = "NULL pointer";
+ else if (object == ZERO_SIZE_PTR)
+ type = "zero-size pointer";
+ else
+ type = "non-paged memory";
+
+ pr_cont(" %s\n", type);
}
EXPORT_SYMBOL_GPL(mem_dump_obj);
#endif
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index d33894d7b27a..9c539f0730a5 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -3083,7 +3083,7 @@ EXPORT_SYMBOL(vzalloc_node);
* 64b systems should always have either DMA or DMA32 zones. For others
* GFP_DMA32 should do the right thing and use the normal zone.
*/
-#define GFP_VMALLOC32 GFP_DMA32 | GFP_KERNEL
+#define GFP_VMALLOC32 (GFP_DMA32 | GFP_KERNEL)
#endif
/**
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 562e87cbd7a1..5199b9696bab 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -185,39 +185,181 @@ static LIST_HEAD(shrinker_list);
static DECLARE_RWSEM(shrinker_rwsem);
#ifdef CONFIG_MEMCG
-/*
- * We allow subsystems to populate their shrinker-related
- * LRU lists before register_shrinker_prepared() is called
- * for the shrinker, since we don't want to impose
- * restrictions on their internal registration order.
- * In this case shrink_slab_memcg() may find corresponding
- * bit is set in the shrinkers map.
- *
- * This value is used by the function to detect registering
- * shrinkers and to skip do_shrink_slab() calls for them.
- */
-#define SHRINKER_REGISTERING ((struct shrinker *)~0UL)
+static int shrinker_nr_max;
+
+/* The shrinker_info is expanded in a batch of BITS_PER_LONG */
+static inline int shrinker_map_size(int nr_items)
+{
+ return (DIV_ROUND_UP(nr_items, BITS_PER_LONG) * sizeof(unsigned long));
+}
+
+static inline int shrinker_defer_size(int nr_items)
+{
+ return (round_up(nr_items, BITS_PER_LONG) * sizeof(atomic_long_t));
+}
+
+static struct shrinker_info *shrinker_info_protected(struct mem_cgroup *memcg,
+ int nid)
+{
+ return rcu_dereference_protected(memcg->nodeinfo[nid]->shrinker_info,
+ lockdep_is_held(&shrinker_rwsem));
+}
+
+static int expand_one_shrinker_info(struct mem_cgroup *memcg,
+ int map_size, int defer_size,
+ int old_map_size, int old_defer_size)
+{
+ struct shrinker_info *new, *old;
+ struct mem_cgroup_per_node *pn;
+ int nid;
+ int size = map_size + defer_size;
+
+ for_each_node(nid) {
+ pn = memcg->nodeinfo[nid];
+ old = shrinker_info_protected(memcg, nid);
+ /* Not yet online memcg */
+ if (!old)
+ return 0;
+
+ new = kvmalloc_node(sizeof(*new) + size, GFP_KERNEL, nid);
+ if (!new)
+ return -ENOMEM;
+
+ new->nr_deferred = (atomic_long_t *)(new + 1);
+ new->map = (void *)new->nr_deferred + defer_size;
+
+ /* map: set all old bits, clear all new bits */
+ memset(new->map, (int)0xff, old_map_size);
+ memset((void *)new->map + old_map_size, 0, map_size - old_map_size);
+ /* nr_deferred: copy old values, clear all new values */
+ memcpy(new->nr_deferred, old->nr_deferred, old_defer_size);
+ memset((void *)new->nr_deferred + old_defer_size, 0,
+ defer_size - old_defer_size);
+
+ rcu_assign_pointer(pn->shrinker_info, new);
+ kvfree_rcu(old, rcu);
+ }
+
+ return 0;
+}
+
+void free_shrinker_info(struct mem_cgroup *memcg)
+{
+ struct mem_cgroup_per_node *pn;
+ struct shrinker_info *info;
+ int nid;
+
+ for_each_node(nid) {
+ pn = memcg->nodeinfo[nid];
+ info = rcu_dereference_protected(pn->shrinker_info, true);
+ kvfree(info);
+ rcu_assign_pointer(pn->shrinker_info, NULL);
+ }
+}
+
+int alloc_shrinker_info(struct mem_cgroup *memcg)
+{
+ struct shrinker_info *info;
+ int nid, size, ret = 0;
+ int map_size, defer_size = 0;
+
+ down_write(&shrinker_rwsem);
+ map_size = shrinker_map_size(shrinker_nr_max);
+ defer_size = shrinker_defer_size(shrinker_nr_max);
+ size = map_size + defer_size;
+ for_each_node(nid) {
+ info = kvzalloc_node(sizeof(*info) + size, GFP_KERNEL, nid);
+ if (!info) {
+ free_shrinker_info(memcg);
+ ret = -ENOMEM;
+ break;
+ }
+ info->nr_deferred = (atomic_long_t *)(info + 1);
+ info->map = (void *)info->nr_deferred + defer_size;
+ rcu_assign_pointer(memcg->nodeinfo[nid]->shrinker_info, info);
+ }
+ up_write(&shrinker_rwsem);
+
+ return ret;
+}
+
+static inline bool need_expand(int nr_max)
+{
+ return round_up(nr_max, BITS_PER_LONG) >
+ round_up(shrinker_nr_max, BITS_PER_LONG);
+}
+
+static int expand_shrinker_info(int new_id)
+{
+ int ret = 0;
+ int new_nr_max = new_id + 1;
+ int map_size, defer_size = 0;
+ int old_map_size, old_defer_size = 0;
+ struct mem_cgroup *memcg;
+
+ if (!need_expand(new_nr_max))
+ goto out;
+
+ if (!root_mem_cgroup)
+ goto out;
+
+ lockdep_assert_held(&shrinker_rwsem);
+
+ map_size = shrinker_map_size(new_nr_max);
+ defer_size = shrinker_defer_size(new_nr_max);
+ old_map_size = shrinker_map_size(shrinker_nr_max);
+ old_defer_size = shrinker_defer_size(shrinker_nr_max);
+
+ memcg = mem_cgroup_iter(NULL, NULL, NULL);
+ do {
+ ret = expand_one_shrinker_info(memcg, map_size, defer_size,
+ old_map_size, old_defer_size);
+ if (ret) {
+ mem_cgroup_iter_break(NULL, memcg);
+ goto out;
+ }
+ } while ((memcg = mem_cgroup_iter(NULL, memcg, NULL)) != NULL);
+out:
+ if (!ret)
+ shrinker_nr_max = new_nr_max;
+
+ return ret;
+}
+
+void set_shrinker_bit(struct mem_cgroup *memcg, int nid, int shrinker_id)
+{
+ if (shrinker_id >= 0 && memcg && !mem_cgroup_is_root(memcg)) {
+ struct shrinker_info *info;
+
+ rcu_read_lock();
+ info = rcu_dereference(memcg->nodeinfo[nid]->shrinker_info);
+ /* Pairs with smp mb in shrink_slab() */
+ smp_mb__before_atomic();
+ set_bit(shrinker_id, info->map);
+ rcu_read_unlock();
+ }
+}
static DEFINE_IDR(shrinker_idr);
-static int shrinker_nr_max;
static int prealloc_memcg_shrinker(struct shrinker *shrinker)
{
int id, ret = -ENOMEM;
+ if (mem_cgroup_disabled())
+ return -ENOSYS;
+
down_write(&shrinker_rwsem);
/* This may call shrinker, so it must use down_read_trylock() */
- id = idr_alloc(&shrinker_idr, SHRINKER_REGISTERING, 0, 0, GFP_KERNEL);
+ id = idr_alloc(&shrinker_idr, shrinker, 0, 0, GFP_KERNEL);
if (id < 0)
goto unlock;
if (id >= shrinker_nr_max) {
- if (memcg_expand_shrinker_maps(id)) {
+ if (expand_shrinker_info(id)) {
idr_remove(&shrinker_idr, id);
goto unlock;
}
-
- shrinker_nr_max = id + 1;
}
shrinker->id = id;
ret = 0;
@@ -232,9 +374,51 @@ static void unregister_memcg_shrinker(struct shrinker *shrinker)
BUG_ON(id < 0);
- down_write(&shrinker_rwsem);
+ lockdep_assert_held(&shrinker_rwsem);
+
idr_remove(&shrinker_idr, id);
- up_write(&shrinker_rwsem);
+}
+
+static long xchg_nr_deferred_memcg(int nid, struct shrinker *shrinker,
+ struct mem_cgroup *memcg)
+{
+ struct shrinker_info *info;
+
+ info = shrinker_info_protected(memcg, nid);
+ return atomic_long_xchg(&info->nr_deferred[shrinker->id], 0);
+}
+
+static long add_nr_deferred_memcg(long nr, int nid, struct shrinker *shrinker,
+ struct mem_cgroup *memcg)
+{
+ struct shrinker_info *info;
+
+ info = shrinker_info_protected(memcg, nid);
+ return atomic_long_add_return(nr, &info->nr_deferred[shrinker->id]);
+}
+
+void reparent_shrinker_deferred(struct mem_cgroup *memcg)
+{
+ int i, nid;
+ long nr;
+ struct mem_cgroup *parent;
+ struct shrinker_info *child_info, *parent_info;
+
+ parent = parent_mem_cgroup(memcg);
+ if (!parent)
+ parent = root_mem_cgroup;
+
+ /* Prevent from concurrent shrinker_info expand */
+ down_read(&shrinker_rwsem);
+ for_each_node(nid) {
+ child_info = shrinker_info_protected(memcg, nid);
+ parent_info = shrinker_info_protected(parent, nid);
+ for (i = 0; i < shrinker_nr_max; i++) {
+ nr = atomic_long_read(&child_info->nr_deferred[i]);
+ atomic_long_add(nr, &parent_info->nr_deferred[i]);
+ }
+ }
+ up_read(&shrinker_rwsem);
}
static bool cgroup_reclaim(struct scan_control *sc)
@@ -268,13 +452,25 @@ static bool writeback_throttling_sane(struct scan_control *sc)
#else
static int prealloc_memcg_shrinker(struct shrinker *shrinker)
{
- return 0;
+ return -ENOSYS;
}
static void unregister_memcg_shrinker(struct shrinker *shrinker)
{
}
+static long xchg_nr_deferred_memcg(int nid, struct shrinker *shrinker,
+ struct mem_cgroup *memcg)
+{
+ return 0;
+}
+
+static long add_nr_deferred_memcg(long nr, int nid, struct shrinker *shrinker,
+ struct mem_cgroup *memcg)
+{
+ return 0;
+}
+
static bool cgroup_reclaim(struct scan_control *sc)
{
return false;
@@ -286,6 +482,39 @@ static bool writeback_throttling_sane(struct scan_control *sc)
}
#endif
+static long xchg_nr_deferred(struct shrinker *shrinker,
+ struct shrink_control *sc)
+{
+ int nid = sc->nid;
+
+ if (!(shrinker->flags & SHRINKER_NUMA_AWARE))
+ nid = 0;
+
+ if (sc->memcg &&
+ (shrinker->flags & SHRINKER_MEMCG_AWARE))
+ return xchg_nr_deferred_memcg(nid, shrinker,
+ sc->memcg);
+
+ return atomic_long_xchg(&shrinker->nr_deferred[nid], 0);
+}
+
+
+static long add_nr_deferred(long nr, struct shrinker *shrinker,
+ struct shrink_control *sc)
+{
+ int nid = sc->nid;
+
+ if (!(shrinker->flags & SHRINKER_NUMA_AWARE))
+ nid = 0;
+
+ if (sc->memcg &&
+ (shrinker->flags & SHRINKER_MEMCG_AWARE))
+ return add_nr_deferred_memcg(nr, nid, shrinker,
+ sc->memcg);
+
+ return atomic_long_add_return(nr, &shrinker->nr_deferred[nid]);
+}
+
/*
* This misses isolated pages which are not accounted for to save counters.
* As the data only determines if reclaim or compaction continues, it is
@@ -335,8 +564,18 @@ static unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru,
*/
int prealloc_shrinker(struct shrinker *shrinker)
{
- unsigned int size = sizeof(*shrinker->nr_deferred);
+ unsigned int size;
+ int err;
+
+ if (shrinker->flags & SHRINKER_MEMCG_AWARE) {
+ err = prealloc_memcg_shrinker(shrinker);
+ if (err != -ENOSYS)
+ return err;
+
+ shrinker->flags &= ~SHRINKER_MEMCG_AWARE;
+ }
+ size = sizeof(*shrinker->nr_deferred);
if (shrinker->flags & SHRINKER_NUMA_AWARE)
size *= nr_node_ids;
@@ -344,26 +583,17 @@ int prealloc_shrinker(struct shrinker *shrinker)
if (!shrinker->nr_deferred)
return -ENOMEM;
- if (shrinker->flags & SHRINKER_MEMCG_AWARE) {
- if (prealloc_memcg_shrinker(shrinker))
- goto free_deferred;
- }
-
return 0;
-
-free_deferred:
- kfree(shrinker->nr_deferred);
- shrinker->nr_deferred = NULL;
- return -ENOMEM;
}
void free_prealloced_shrinker(struct shrinker *shrinker)
{
- if (!shrinker->nr_deferred)
- return;
-
- if (shrinker->flags & SHRINKER_MEMCG_AWARE)
+ if (shrinker->flags & SHRINKER_MEMCG_AWARE) {
+ down_write(&shrinker_rwsem);
unregister_memcg_shrinker(shrinker);
+ up_write(&shrinker_rwsem);
+ return;
+ }
kfree(shrinker->nr_deferred);
shrinker->nr_deferred = NULL;
@@ -373,10 +603,7 @@ void register_shrinker_prepared(struct shrinker *shrinker)
{
down_write(&shrinker_rwsem);
list_add_tail(&shrinker->list, &shrinker_list);
-#ifdef CONFIG_MEMCG
- if (shrinker->flags & SHRINKER_MEMCG_AWARE)
- idr_replace(&shrinker_idr, shrinker, shrinker->id);
-#endif
+ shrinker->flags |= SHRINKER_REGISTERED;
up_write(&shrinker_rwsem);
}
@@ -396,13 +623,16 @@ EXPORT_SYMBOL(register_shrinker);
*/
void unregister_shrinker(struct shrinker *shrinker)
{
- if (!shrinker->nr_deferred)
+ if (!(shrinker->flags & SHRINKER_REGISTERED))
return;
- if (shrinker->flags & SHRINKER_MEMCG_AWARE)
- unregister_memcg_shrinker(shrinker);
+
down_write(&shrinker_rwsem);
list_del(&shrinker->list);
+ shrinker->flags &= ~SHRINKER_REGISTERED;
+ if (shrinker->flags & SHRINKER_MEMCG_AWARE)
+ unregister_memcg_shrinker(shrinker);
up_write(&shrinker_rwsem);
+
kfree(shrinker->nr_deferred);
shrinker->nr_deferred = NULL;
}
@@ -419,14 +649,10 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
long freeable;
long nr;
long new_nr;
- int nid = shrinkctl->nid;
long batch_size = shrinker->batch ? shrinker->batch
: SHRINK_BATCH;
long scanned = 0, next_deferred;
- if (!(shrinker->flags & SHRINKER_NUMA_AWARE))
- nid = 0;
-
freeable = shrinker->count_objects(shrinker, shrinkctl);
if (freeable == 0 || freeable == SHRINK_EMPTY)
return freeable;
@@ -436,9 +662,8 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
* and zero it so that other concurrent shrinker invocations
* don't also do this scanning work.
*/
- nr = atomic_long_xchg(&shrinker->nr_deferred[nid], 0);
+ nr = xchg_nr_deferred(shrinker, shrinkctl);
- total_scan = nr;
if (shrinker->seeks) {
delta = freeable >> priority;
delta *= 4;
@@ -452,37 +677,9 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
delta = freeable / 2;
}
+ total_scan = nr >> priority;
total_scan += delta;
- if (total_scan < 0) {
- pr_err("shrink_slab: %pS negative objects to delete nr=%ld\n",
- shrinker->scan_objects, total_scan);
- total_scan = freeable;
- next_deferred = nr;
- } else
- next_deferred = total_scan;
-
- /*
- * We need to avoid excessive windup on filesystem shrinkers
- * due to large numbers of GFP_NOFS allocations causing the
- * shrinkers to return -1 all the time. This results in a large
- * nr being built up so when a shrink that can do some work
- * comes along it empties the entire cache due to nr >>>
- * freeable. This is bad for sustaining a working set in
- * memory.
- *
- * Hence only allow the shrinker to scan the entire cache when
- * a large delta change is calculated directly.
- */
- if (delta < freeable / 4)
- total_scan = min(total_scan, freeable / 2);
-
- /*
- * Avoid risking looping forever due to too large nr value:
- * never try to free more than twice the estimate number of
- * freeable entries.
- */
- if (total_scan > freeable * 2)
- total_scan = freeable * 2;
+ total_scan = min(total_scan, (2 * freeable));
trace_mm_shrink_slab_start(shrinker, shrinkctl, nr,
freeable, delta, total_scan, priority);
@@ -521,22 +718,22 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
cond_resched();
}
- if (next_deferred >= scanned)
- next_deferred -= scanned;
- else
- next_deferred = 0;
+ /*
+ * The deferred work is increased by any new work (delta) that wasn't
+ * done, decreased by old deferred work that was done now.
+ *
+ * And it is capped to two times of the freeable items.
+ */
+ next_deferred = max_t(long, (nr + delta - scanned), 0);
+ next_deferred = min(next_deferred, (2 * freeable));
+
/*
* move the unused scan count back into the shrinker in a
- * manner that handles concurrent updates. If we exhausted the
- * scan, there is no need to do an update.
+ * manner that handles concurrent updates.
*/
- if (next_deferred > 0)
- new_nr = atomic_long_add_return(next_deferred,
- &shrinker->nr_deferred[nid]);
- else
- new_nr = atomic_long_read(&shrinker->nr_deferred[nid]);
+ new_nr = add_nr_deferred(next_deferred, shrinker, shrinkctl);
- trace_mm_shrink_slab_end(shrinker, nid, freed, nr, new_nr, total_scan);
+ trace_mm_shrink_slab_end(shrinker, shrinkctl->nid, freed, nr, new_nr, total_scan);
return freed;
}
@@ -544,7 +741,7 @@ static unsigned long do_shrink_slab(struct shrink_control *shrinkctl,
static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid,
struct mem_cgroup *memcg, int priority)
{
- struct memcg_shrinker_map *map;
+ struct shrinker_info *info;
unsigned long ret, freed = 0;
int i;
@@ -554,12 +751,11 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid,
if (!down_read_trylock(&shrinker_rwsem))
return 0;
- map = rcu_dereference_protected(memcg->nodeinfo[nid]->shrinker_map,
- true);
- if (unlikely(!map))
+ info = shrinker_info_protected(memcg, nid);
+ if (unlikely(!info))
goto unlock;
- for_each_set_bit(i, map->map, shrinker_nr_max) {
+ for_each_set_bit(i, info->map, shrinker_nr_max) {
struct shrink_control sc = {
.gfp_mask = gfp_mask,
.nid = nid,
@@ -568,9 +764,9 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid,
struct shrinker *shrinker;
shrinker = idr_find(&shrinker_idr, i);
- if (unlikely(!shrinker || shrinker == SHRINKER_REGISTERING)) {
+ if (unlikely(!shrinker || !(shrinker->flags & SHRINKER_REGISTERED))) {
if (!shrinker)
- clear_bit(i, map->map);
+ clear_bit(i, info->map);
continue;
}
@@ -581,7 +777,7 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid,
ret = do_shrink_slab(&sc, shrinker, priority);
if (ret == SHRINK_EMPTY) {
- clear_bit(i, map->map);
+ clear_bit(i, info->map);
/*
* After the shrinker reported that it had no objects to
* free, but before we cleared the corresponding bit in
@@ -590,7 +786,7 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid,
* case, we invoke the shrinker one more time and reset
* the bit if it reports that it is not empty anymore.
* The memory barrier here pairs with the barrier in
- * memcg_set_shrinker_bit():
+ * set_shrinker_bit():
*
* list_lru_add() shrink_slab_memcg()
* list_add_tail() clear_bit()
@@ -602,7 +798,7 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid,
if (ret == SHRINK_EMPTY)
ret = 0;
else
- memcg_set_shrinker_bit(memcg, nid, i);
+ set_shrinker_bit(memcg, nid, i);
}
freed += ret;
@@ -1507,8 +1703,9 @@ unsigned int reclaim_clean_pages_from_list(struct zone *zone,
LIST_HEAD(clean_pages);
list_for_each_entry_safe(page, next, page_list, lru) {
- if (page_is_file_lru(page) && !PageDirty(page) &&
- !__PageMovable(page) && !PageUnevictable(page)) {
+ if (!PageHuge(page) && page_is_file_lru(page) &&
+ !PageDirty(page) && !__PageMovable(page) &&
+ !PageUnevictable(page)) {
ClearPageActive(page);
list_move(&page->lru, &clean_pages);
}
@@ -3862,7 +4059,7 @@ static int kswapd(void *p)
{
unsigned int alloc_order, reclaim_order;
unsigned int highest_zoneidx = MAX_NR_ZONES - 1;
- pg_data_t *pgdat = (pg_data_t*)p;
+ pg_data_t *pgdat = (pg_data_t *)p;
struct task_struct *tsk = current;
const struct cpumask *cpumask = cpumask_of_node(pgdat->node_id);
@@ -4086,14 +4283,6 @@ module_init(kswapd_init)
int node_reclaim_mode __read_mostly;
/*
- * These bit locations are exposed in the vm.zone_reclaim_mode sysctl
- * ABI. New bits are OK, but existing bits can never change.
- */
-#define RECLAIM_ZONE (1<<0) /* Run shrink_inactive_list on the zone */
-#define RECLAIM_WRITE (1<<1) /* Writeout pages during reclaim */
-#define RECLAIM_UNMAP (1<<2) /* Unmap pages during reclaim */
-
-/*
* Priority for NODE_RECLAIM. This determines the fraction of pages
* of a node considered for each zone_reclaim. 4 scans 1/16th of
* a zone.
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 74b2c374b86c..5ba118521ded 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1313,6 +1313,10 @@ const char * const vmstat_text[] = {
"htlb_buddy_alloc_success",
"htlb_buddy_alloc_fail",
#endif
+#ifdef CONFIG_CMA
+ "cma_alloc_success",
+ "cma_alloc_fail",
+#endif
"unevictable_pgs_culled",
"unevictable_pgs_scanned",
"unevictable_pgs_rescued",
@@ -1365,6 +1369,10 @@ const char * const vmstat_text[] = {
"swap_ra",
"swap_ra_hit",
#endif
+#ifdef CONFIG_X86
+ "direct_map_level2_splits",
+ "direct_map_level3_splits",
+#endif
#endif /* CONFIG_VM_EVENT_COUNTERS || CONFIG_MEMCG */
};
#endif /* CONFIG_PROC_FS || CONFIG_SYSFS || CONFIG_NUMA || CONFIG_MEMCG */
@@ -1854,25 +1862,34 @@ int vmstat_refresh(struct ctl_table *table, int write,
if (err)
return err;
for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) {
+ /*
+ * Skip checking stats known to go negative occasionally.
+ */
+ switch (i) {
+ case NR_ZONE_WRITE_PENDING:
+ case NR_FREE_CMA_PAGES:
+ continue;
+ }
val = atomic_long_read(&vm_zone_stat[i]);
if (val < 0) {
pr_warn("%s: %s %ld\n",
__func__, zone_stat_name(i), val);
- err = -EINVAL;
}
}
-#ifdef CONFIG_NUMA
- for (i = 0; i < NR_VM_NUMA_STAT_ITEMS; i++) {
- val = atomic_long_read(&vm_numa_stat[i]);
+ for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
+ /*
+ * Skip checking stats known to go negative occasionally.
+ */
+ switch (i) {
+ case NR_WRITEBACK:
+ continue;
+ }
+ val = atomic_long_read(&vm_node_stat[i]);
if (val < 0) {
pr_warn("%s: %s %ld\n",
- __func__, numa_stat_name(i), val);
- err = -EINVAL;
+ __func__, node_stat_name(i), val);
}
}
-#endif
- if (err)
- return err;
if (write)
*ppos += *lenp;
else
diff --git a/mm/workingset.c b/mm/workingset.c
index cd39902c1062..b7cdeca5a76d 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -554,7 +554,6 @@ static enum lru_status shadow_lru_isolate(struct list_head *item,
goto out_invalid;
if (WARN_ON_ONCE(node->count != node->nr_values))
goto out_invalid;
- mapping->nrexceptional -= node->nr_values;
xa_delete_node(node, workingset_update_node);
__inc_lruvec_kmem_state(node, WORKINGSET_NODERECLAIM);
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 30c358b72025..58697f7a43f8 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1987,8 +1987,7 @@ static int zs_page_migrate(struct address_space *mapping, struct page *newpage,
head = obj_to_head(page, addr);
if (head & OBJ_ALLOCATED_TAG) {
handle = head & ~OBJ_ALLOCATED_TAG;
- if (!testpin_tag(handle))
- BUG();
+ BUG_ON(!testpin_tag(handle));
old_obj = handle_to_obj(handle);
obj_to_location(old_obj, &dummy, &obj_idx);
@@ -2035,8 +2034,7 @@ unpin_objects:
head = obj_to_head(page, addr);
if (head & OBJ_ALLOCATED_TAG) {
handle = head & ~OBJ_ALLOCATED_TAG;
- if (!testpin_tag(handle))
- BUG();
+ BUG_ON(!testpin_tag(handle));
unpin_tag(handle);
}
}
diff --git a/mm/zswap.c b/mm/zswap.c
index 578d9f256920..20763267a219 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -614,7 +614,7 @@ static struct zswap_pool *zswap_pool_create(char *type, char *compressor)
}
pr_debug("using %s zpool\n", zpool_get_type(pool->zpool));
- strlcpy(pool->tfm_name, compressor, sizeof(pool->tfm_name));
+ strscpy(pool->tfm_name, compressor, sizeof(pool->tfm_name));
pool->acomp_ctx = alloc_percpu(*pool->acomp_ctx);
if (!pool->acomp_ctx) {
diff --git a/tools/testing/selftests/vm/.gitignore b/tools/testing/selftests/vm/.gitignore
index 9a35c3f6a557..1f651e85ed60 100644
--- a/tools/testing/selftests/vm/.gitignore
+++ b/tools/testing/selftests/vm/.gitignore
@@ -22,3 +22,4 @@ map_fixed_noreplace
write_to_hugetlbfs
hmm-tests
local_config.*
+split_huge_page_test
diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/vm/Makefile
index 8b0cd421ebd3..73e1cc96d7c2 100644
--- a/tools/testing/selftests/vm/Makefile
+++ b/tools/testing/selftests/vm/Makefile
@@ -42,6 +42,7 @@ TEST_GEN_FILES += on-fault-limit
TEST_GEN_FILES += thuge-gen
TEST_GEN_FILES += transhuge-stress
TEST_GEN_FILES += userfaultfd
+TEST_GEN_FILES += split_huge_page_test
ifeq ($(MACHINE),x86_64)
CAN_BUILD_I386 := $(shell ./../x86/check_cc.sh $(CC) ../x86/trivial_32bit_program.c -m32)
diff --git a/tools/testing/selftests/vm/gup_test.c b/tools/testing/selftests/vm/gup_test.c
index 6c6336dd3b7f..1e662d59c502 100644
--- a/tools/testing/selftests/vm/gup_test.c
+++ b/tools/testing/selftests/vm/gup_test.c
@@ -13,6 +13,7 @@
/* Just the flags we need, copied from mm.h: */
#define FOLL_WRITE 0x01 /* check pte is writable */
+#define FOLL_TOUCH 0x02 /* mark page accessed */
static char *cmd_to_str(unsigned long cmd)
{
@@ -37,13 +38,13 @@ int main(int argc, char **argv)
{
struct gup_test gup = { 0 };
unsigned long size = 128 * MB;
- int i, fd, filed, opt, nr_pages = 1, thp = -1, repeats = 1, write = 0;
+ int i, fd, filed, opt, nr_pages = 1, thp = -1, repeats = 1, write = 1;
unsigned long cmd = GUP_FAST_BENCHMARK;
- int flags = MAP_PRIVATE;
+ int flags = MAP_PRIVATE, touch = 0;
char *file = "/dev/zero";
char *p;
- while ((opt = getopt(argc, argv, "m:r:n:F:f:abctTLUuwSH")) != -1) {
+ while ((opt = getopt(argc, argv, "m:r:n:F:f:abctTLUuwWSHpz")) != -1) {
switch (opt) {
case 'a':
cmd = PIN_FAST_BENCHMARK;
@@ -65,9 +66,13 @@ int main(int argc, char **argv)
*/
gup.which_pages[0] = 1;
break;
+ case 'p':
+ /* works only with DUMP_USER_PAGES_TEST */
+ gup.test_flags |= GUP_TEST_FLAG_DUMP_PAGES_USE_PIN;
+ break;
case 'F':
/* strtol, so you can pass flags in hex form */
- gup.flags = strtol(optarg, 0, 0);
+ gup.gup_flags = strtol(optarg, 0, 0);
break;
case 'm':
size = atoi(optarg) * MB;
@@ -93,6 +98,9 @@ int main(int argc, char **argv)
case 'w':
write = 1;
break;
+ case 'W':
+ write = 0;
+ break;
case 'f':
file = optarg;
break;
@@ -103,6 +111,10 @@ int main(int argc, char **argv)
case 'H':
flags |= (MAP_HUGETLB | MAP_ANONYMOUS);
break;
+ case 'z':
+ /* fault pages in gup, do not fault in userland */
+ touch = 1;
+ break;
default:
return -1;
}
@@ -140,7 +152,7 @@ int main(int argc, char **argv)
gup.nr_pages_per_call = nr_pages;
if (write)
- gup.flags |= FOLL_WRITE;
+ gup.gup_flags |= FOLL_WRITE;
fd = open("/sys/kernel/debug/gup_test", O_RDWR);
if (fd == -1) {
@@ -160,8 +172,18 @@ int main(int argc, char **argv)
else if (thp == 0)
madvise(p, size, MADV_NOHUGEPAGE);
- for (; (unsigned long)p < gup.addr + size; p += PAGE_SIZE)
- p[0] = 0;
+ /*
+ * FOLL_TOUCH, in gup_test, is used as an either/or case: either
+ * fault pages in from the kernel via FOLL_TOUCH, or fault them
+ * in here, from user space. This allows comparison of performance
+ * between those two cases.
+ */
+ if (touch) {
+ gup.gup_flags |= FOLL_TOUCH;
+ } else {
+ for (; (unsigned long)p < gup.addr + size; p += PAGE_SIZE)
+ p[0] = 0;
+ }
/* Only report timing information on the *_BENCHMARK commands: */
if ((cmd == PIN_FAST_BENCHMARK) || (cmd == GUP_FAST_BENCHMARK) ||
diff --git a/tools/testing/selftests/vm/split_huge_page_test.c b/tools/testing/selftests/vm/split_huge_page_test.c
new file mode 100644
index 000000000000..1af16d2c2a0a
--- /dev/null
+++ b/tools/testing/selftests/vm/split_huge_page_test.c
@@ -0,0 +1,390 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * A test of splitting PMD THPs and PTE-mapped THPs from a specified virtual
+ * address range in a process via <debugfs>/split_huge_pages interface.
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/mount.h>
+#include <malloc.h>
+#include <stdbool.h>
+
+uint64_t pagesize;
+unsigned int pageshift;
+uint64_t pmd_pagesize;
+
+#define PMD_SIZE_PATH "/sys/kernel/mm/transparent_hugepage/hpage_pmd_size"
+#define SPLIT_DEBUGFS "/sys/kernel/debug/split_huge_pages"
+#define SMAP_PATH "/proc/self/smaps"
+#define INPUT_MAX 80
+
+#define PID_FMT "%d,0x%lx,0x%lx"
+#define PATH_FMT "%s,0x%lx,0x%lx"
+
+#define PFN_MASK ((1UL<<55)-1)
+#define KPF_THP (1UL<<22)
+
+int is_backed_by_thp(char *vaddr, int pagemap_file, int kpageflags_file)
+{
+ uint64_t paddr;
+ uint64_t page_flags;
+
+ if (pagemap_file) {
+ pread(pagemap_file, &paddr, sizeof(paddr),
+ ((long)vaddr >> pageshift) * sizeof(paddr));
+
+ if (kpageflags_file) {
+ pread(kpageflags_file, &page_flags, sizeof(page_flags),
+ (paddr & PFN_MASK) * sizeof(page_flags));
+
+ return !!(page_flags & KPF_THP);
+ }
+ }
+ return 0;
+}
+
+
+static uint64_t read_pmd_pagesize(void)
+{
+ int fd;
+ char buf[20];
+ ssize_t num_read;
+
+ fd = open(PMD_SIZE_PATH, O_RDONLY);
+ if (fd == -1) {
+ perror("Open hpage_pmd_size failed");
+ exit(EXIT_FAILURE);
+ }
+ num_read = read(fd, buf, 19);
+ if (num_read < 1) {
+ close(fd);
+ perror("Read hpage_pmd_size failed");
+ exit(EXIT_FAILURE);
+ }
+ buf[num_read] = '\0';
+ close(fd);
+
+ return strtoul(buf, NULL, 10);
+}
+
+static int write_file(const char *path, const char *buf, size_t buflen)
+{
+ int fd;
+ ssize_t numwritten;
+
+ fd = open(path, O_WRONLY);
+ if (fd == -1)
+ return 0;
+
+ numwritten = write(fd, buf, buflen - 1);
+ close(fd);
+ if (numwritten < 1)
+ return 0;
+
+ return (unsigned int) numwritten;
+}
+
+static void write_debugfs(const char *fmt, ...)
+{
+ char input[INPUT_MAX];
+ int ret;
+ va_list argp;
+
+ va_start(argp, fmt);
+ ret = vsnprintf(input, INPUT_MAX, fmt, argp);
+ va_end(argp);
+
+ if (ret >= INPUT_MAX) {
+ printf("%s: Debugfs input is too long\n", __func__);
+ exit(EXIT_FAILURE);
+ }
+
+ if (!write_file(SPLIT_DEBUGFS, input, ret + 1)) {
+ perror(SPLIT_DEBUGFS);
+ exit(EXIT_FAILURE);
+ }
+}
+
+#define MAX_LINE_LENGTH 500
+
+static bool check_for_pattern(FILE *fp, const char *pattern, char *buf)
+{
+ while (fgets(buf, MAX_LINE_LENGTH, fp) != NULL) {
+ if (!strncmp(buf, pattern, strlen(pattern)))
+ return true;
+ }
+ return false;
+}
+
+static uint64_t check_huge(void *addr)
+{
+ uint64_t thp = 0;
+ int ret;
+ FILE *fp;
+ char buffer[MAX_LINE_LENGTH];
+ char addr_pattern[MAX_LINE_LENGTH];
+
+ ret = snprintf(addr_pattern, MAX_LINE_LENGTH, "%08lx-",
+ (unsigned long) addr);
+ if (ret >= MAX_LINE_LENGTH) {
+ printf("%s: Pattern is too long\n", __func__);
+ exit(EXIT_FAILURE);
+ }
+
+
+ fp = fopen(SMAP_PATH, "r");
+ if (!fp) {
+ printf("%s: Failed to open file %s\n", __func__, SMAP_PATH);
+ exit(EXIT_FAILURE);
+ }
+ if (!check_for_pattern(fp, addr_pattern, buffer))
+ goto err_out;
+
+ /*
+ * Fetch the AnonHugePages: in the same block and check the number of
+ * hugepages.
+ */
+ if (!check_for_pattern(fp, "AnonHugePages:", buffer))
+ goto err_out;
+
+ if (sscanf(buffer, "AnonHugePages:%10ld kB", &thp) != 1) {
+ printf("Reading smap error\n");
+ exit(EXIT_FAILURE);
+ }
+
+err_out:
+ fclose(fp);
+ return thp;
+}
+
+void split_pmd_thp(void)
+{
+ char *one_page;
+ size_t len = 4 * pmd_pagesize;
+ uint64_t thp_size;
+ size_t i;
+
+ one_page = memalign(pmd_pagesize, len);
+
+ if (!one_page) {
+ printf("Fail to allocate memory\n");
+ exit(EXIT_FAILURE);
+ }
+
+ madvise(one_page, len, MADV_HUGEPAGE);
+
+ for (i = 0; i < len; i++)
+ one_page[i] = (char)i;
+
+ thp_size = check_huge(one_page);
+ if (!thp_size) {
+ printf("No THP is allocated\n");
+ exit(EXIT_FAILURE);
+ }
+
+ /* split all THPs */
+ write_debugfs(PID_FMT, getpid(), (uint64_t)one_page,
+ (uint64_t)one_page + len);
+
+ for (i = 0; i < len; i++)
+ if (one_page[i] != (char)i) {
+ printf("%ld byte corrupted\n", i);
+ exit(EXIT_FAILURE);
+ }
+
+
+ thp_size = check_huge(one_page);
+ if (thp_size) {
+ printf("Still %ld kB AnonHugePages not split\n", thp_size);
+ exit(EXIT_FAILURE);
+ }
+
+ printf("Split huge pages successful\n");
+ free(one_page);
+}
+
+void split_pte_mapped_thp(void)
+{
+ char *one_page, *pte_mapped, *pte_mapped2;
+ size_t len = 4 * pmd_pagesize;
+ uint64_t thp_size;
+ size_t i;
+ const char *pagemap_template = "/proc/%d/pagemap";
+ const char *kpageflags_proc = "/proc/kpageflags";
+ char pagemap_proc[255];
+ int pagemap_fd;
+ int kpageflags_fd;
+
+ if (snprintf(pagemap_proc, 255, pagemap_template, getpid()) < 0) {
+ perror("get pagemap proc error");
+ exit(EXIT_FAILURE);
+ }
+ pagemap_fd = open(pagemap_proc, O_RDONLY);
+
+ if (pagemap_fd == -1) {
+ perror("read pagemap:");
+ exit(EXIT_FAILURE);
+ }
+
+ kpageflags_fd = open(kpageflags_proc, O_RDONLY);
+
+ if (kpageflags_fd == -1) {
+ perror("read kpageflags:");
+ exit(EXIT_FAILURE);
+ }
+
+ one_page = mmap((void *)(1UL << 30), len, PROT_READ | PROT_WRITE,
+ MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+
+ madvise(one_page, len, MADV_HUGEPAGE);
+
+ for (i = 0; i < len; i++)
+ one_page[i] = (char)i;
+
+ thp_size = check_huge(one_page);
+ if (!thp_size) {
+ printf("No THP is allocated\n");
+ exit(EXIT_FAILURE);
+ }
+
+ /* remap the first pagesize of first THP */
+ pte_mapped = mremap(one_page, pagesize, pagesize, MREMAP_MAYMOVE);
+
+ /* remap the Nth pagesize of Nth THP */
+ for (i = 1; i < 4; i++) {
+ pte_mapped2 = mremap(one_page + pmd_pagesize * i + pagesize * i,
+ pagesize, pagesize,
+ MREMAP_MAYMOVE|MREMAP_FIXED,
+ pte_mapped + pagesize * i);
+ if (pte_mapped2 == (char *)-1) {
+ perror("mremap failed");
+ exit(EXIT_FAILURE);
+ }
+ }
+
+ /* smap does not show THPs after mremap, use kpageflags instead */
+ thp_size = 0;
+ for (i = 0; i < pagesize * 4; i++)
+ if (i % pagesize == 0 &&
+ is_backed_by_thp(&pte_mapped[i], pagemap_fd, kpageflags_fd))
+ thp_size++;
+
+ if (thp_size != 4) {
+ printf("Some THPs are missing during mremap\n");
+ exit(EXIT_FAILURE);
+ }
+
+ /* split all remapped THPs */
+ write_debugfs(PID_FMT, getpid(), (uint64_t)pte_mapped,
+ (uint64_t)pte_mapped + pagesize * 4);
+
+ /* smap does not show THPs after mremap, use kpageflags instead */
+ thp_size = 0;
+ for (i = 0; i < pagesize * 4; i++) {
+ if (pte_mapped[i] != (char)i) {
+ printf("%ld byte corrupted\n", i);
+ exit(EXIT_FAILURE);
+ }
+ if (i % pagesize == 0 &&
+ is_backed_by_thp(&pte_mapped[i], pagemap_fd, kpageflags_fd))
+ thp_size++;
+ }
+
+ if (thp_size) {
+ printf("Still %ld THPs not split\n", thp_size);
+ exit(EXIT_FAILURE);
+ }
+
+ printf("Split PTE-mapped huge pages successful\n");
+ munmap(one_page, len);
+ close(pagemap_fd);
+ close(kpageflags_fd);
+}
+
+void split_file_backed_thp(void)
+{
+ int status;
+ int fd;
+ ssize_t num_written;
+ char tmpfs_template[] = "/tmp/thp_split_XXXXXX";
+ const char *tmpfs_loc = mkdtemp(tmpfs_template);
+ char testfile[INPUT_MAX];
+ uint64_t pgoff_start = 0, pgoff_end = 1024;
+
+ printf("Please enable pr_debug in split_huge_pages_in_file() if you need more info.\n");
+
+ status = mount("tmpfs", tmpfs_loc, "tmpfs", 0, "huge=always,size=4m");
+
+ if (status) {
+ printf("Unable to create a tmpfs for testing\n");
+ exit(EXIT_FAILURE);
+ }
+
+ status = snprintf(testfile, INPUT_MAX, "%s/thp_file", tmpfs_loc);
+ if (status >= INPUT_MAX) {
+ printf("Fail to create file-backed THP split testing file\n");
+ goto cleanup;
+ }
+
+ fd = open(testfile, O_CREAT|O_WRONLY);
+ if (fd == -1) {
+ perror("Cannot open testing file\n");
+ goto cleanup;
+ }
+
+ /* write something to the file, so a file-backed THP can be allocated */
+ num_written = write(fd, tmpfs_loc, sizeof(tmpfs_loc));
+ close(fd);
+
+ if (num_written < 1) {
+ printf("Fail to write data to testing file\n");
+ goto cleanup;
+ }
+
+ /* split the file-backed THP */
+ write_debugfs(PATH_FMT, testfile, pgoff_start, pgoff_end);
+
+ status = unlink(testfile);
+ if (status)
+ perror("Cannot remove testing file\n");
+
+cleanup:
+ status = umount(tmpfs_loc);
+ if (status) {
+ printf("Unable to umount %s\n", tmpfs_loc);
+ exit(EXIT_FAILURE);
+ }
+ status = rmdir(tmpfs_loc);
+ if (status) {
+ perror("cannot remove tmp dir");
+ exit(EXIT_FAILURE);
+ }
+
+ printf("file-backed THP split test done, please check dmesg for more information\n");
+}
+
+int main(int argc, char **argv)
+{
+ if (geteuid() != 0) {
+ printf("Please run the benchmark as root\n");
+ exit(EXIT_FAILURE);
+ }
+
+ pagesize = getpagesize();
+ pageshift = ffs(pagesize) - 1;
+ pmd_pagesize = read_pmd_pagesize();
+
+ split_pmd_thp();
+ split_pte_mapped_thp();
+ split_file_backed_thp();
+
+ return 0;
+}
diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c
index 92b8ec423201..f5ab5e0312e7 100644
--- a/tools/testing/selftests/vm/userfaultfd.c
+++ b/tools/testing/selftests/vm/userfaultfd.c
@@ -81,6 +81,8 @@ static volatile bool test_uffdio_copy_eexist = true;
static volatile bool test_uffdio_zeropage_eexist = true;
/* Whether to test uffd write-protection */
static bool test_uffdio_wp = false;
+/* Whether to test uffd minor faults */
+static bool test_uffdio_minor = false;
static bool map_shared;
static int huge_fd;
@@ -96,6 +98,7 @@ struct uffd_stats {
int cpu;
unsigned long missing_faults;
unsigned long wp_faults;
+ unsigned long minor_faults;
};
/* pthread_mutex_t starts at page offset 0 */
@@ -153,17 +156,19 @@ static void uffd_stats_reset(struct uffd_stats *uffd_stats,
uffd_stats[i].cpu = i;
uffd_stats[i].missing_faults = 0;
uffd_stats[i].wp_faults = 0;
+ uffd_stats[i].minor_faults = 0;
}
}
static void uffd_stats_report(struct uffd_stats *stats, int n_cpus)
{
int i;
- unsigned long long miss_total = 0, wp_total = 0;
+ unsigned long long miss_total = 0, wp_total = 0, minor_total = 0;
for (i = 0; i < n_cpus; i++) {
miss_total += stats[i].missing_faults;
wp_total += stats[i].wp_faults;
+ minor_total += stats[i].minor_faults;
}
printf("userfaults: %llu missing (", miss_total);
@@ -172,6 +177,9 @@ static void uffd_stats_report(struct uffd_stats *stats, int n_cpus)
printf("\b), %llu wp (", wp_total);
for (i = 0; i < n_cpus; i++)
printf("%lu+", stats[i].wp_faults);
+ printf("\b), %llu minor (", minor_total);
+ for (i = 0; i < n_cpus; i++)
+ printf("%lu+", stats[i].minor_faults);
printf("\b)\n");
}
@@ -328,7 +336,7 @@ static struct uffd_test_ops shmem_uffd_test_ops = {
};
static struct uffd_test_ops hugetlb_uffd_test_ops = {
- .expected_ioctls = UFFD_API_RANGE_IOCTLS_BASIC,
+ .expected_ioctls = UFFD_API_RANGE_IOCTLS_BASIC & ~(1 << _UFFDIO_CONTINUE),
.allocate_area = hugetlb_allocate_area,
.release_pages = hugetlb_release_pages,
.alias_mapping = hugetlb_alias_mapping,
@@ -362,6 +370,22 @@ static void wp_range(int ufd, __u64 start, __u64 len, bool wp)
}
}
+static void continue_range(int ufd, __u64 start, __u64 len)
+{
+ struct uffdio_continue req;
+
+ req.range.start = start;
+ req.range.len = len;
+ req.mode = 0;
+
+ if (ioctl(ufd, UFFDIO_CONTINUE, &req)) {
+ fprintf(stderr,
+ "UFFDIO_CONTINUE failed for address 0x%" PRIx64 "\n",
+ (uint64_t)start);
+ exit(1);
+ }
+}
+
static void *locking_thread(void *arg)
{
unsigned long cpu = (unsigned long) arg;
@@ -569,8 +593,32 @@ static void uffd_handle_page_fault(struct uffd_msg *msg,
}
if (msg->arg.pagefault.flags & UFFD_PAGEFAULT_FLAG_WP) {
+ /* Write protect page faults */
wp_range(uffd, msg->arg.pagefault.address, page_size, false);
stats->wp_faults++;
+ } else if (msg->arg.pagefault.flags & UFFD_PAGEFAULT_FLAG_MINOR) {
+ uint8_t *area;
+ int b;
+
+ /*
+ * Minor page faults
+ *
+ * To prove we can modify the original range for testing
+ * purposes, we're going to bit flip this range before
+ * continuing.
+ *
+ * Note that this requires all minor page fault tests operate on
+ * area_dst (non-UFFD-registered) and area_dst_alias
+ * (UFFD-registered).
+ */
+
+ area = (uint8_t *)(area_dst +
+ ((char *)msg->arg.pagefault.address -
+ area_dst_alias));
+ for (b = 0; b < page_size; ++b)
+ area[b] = ~area[b];
+ continue_range(uffd, msg->arg.pagefault.address, page_size);
+ stats->minor_faults++;
} else {
/* Missing page faults */
if (bounces & BOUNCE_VERIFY &&
@@ -779,7 +827,7 @@ static int stress(struct uffd_stats *uffd_stats)
return 0;
}
-static int userfaultfd_open(int features)
+static int userfaultfd_open_ext(uint64_t *features)
{
struct uffdio_api uffdio_api;
@@ -792,7 +840,7 @@ static int userfaultfd_open(int features)
uffd_flags = fcntl(uffd, F_GETFD, NULL);
uffdio_api.api = UFFD_API;
- uffdio_api.features = features;
+ uffdio_api.features = *features;
if (ioctl(uffd, UFFDIO_API, &uffdio_api)) {
fprintf(stderr, "UFFDIO_API failed.\nPlease make sure to "
"run with either root or ptrace capability.\n");
@@ -804,9 +852,15 @@ static int userfaultfd_open(int features)
return 1;
}
+ *features = uffdio_api.features;
return 0;
}
+static int userfaultfd_open(uint64_t features)
+{
+ return userfaultfd_open_ext(&features);
+}
+
sigjmp_buf jbuf, *sigbuf;
static void sighndl(int sig, siginfo_t *siginfo, void *ptr)
@@ -1112,7 +1166,7 @@ static int userfaultfd_events_test(void)
}
if (!pid)
- return faulting_process(0);
+ exit(faulting_process(0));
waitpid(pid, &err, 0);
if (err) {
@@ -1215,6 +1269,102 @@ static int userfaultfd_sig_test(void)
return userfaults != 0;
}
+static int userfaultfd_minor_test(void)
+{
+ struct uffdio_register uffdio_register;
+ unsigned long expected_ioctls;
+ unsigned long p;
+ pthread_t uffd_mon;
+ uint8_t expected_byte;
+ void *expected_page;
+ char c;
+ struct uffd_stats stats = { 0 };
+ uint64_t features = UFFD_FEATURE_MINOR_HUGETLBFS;
+
+ if (!test_uffdio_minor)
+ return 0;
+
+ printf("testing minor faults: ");
+ fflush(stdout);
+
+ if (uffd_test_ops->release_pages(area_dst))
+ return 1;
+
+ if (userfaultfd_open_ext(&features))
+ return 1;
+ /* If kernel reports the feature isn't supported, skip the test. */
+ if (!(features & UFFD_FEATURE_MINOR_HUGETLBFS)) {
+ printf("skipping test due to lack of feature support\n");
+ fflush(stdout);
+ return 0;
+ }
+
+ uffdio_register.range.start = (unsigned long)area_dst_alias;
+ uffdio_register.range.len = nr_pages * page_size;
+ uffdio_register.mode = UFFDIO_REGISTER_MODE_MINOR;
+ if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register)) {
+ fprintf(stderr, "register failure\n");
+ exit(1);
+ }
+
+ expected_ioctls = uffd_test_ops->expected_ioctls;
+ expected_ioctls |= 1 << _UFFDIO_CONTINUE;
+ if ((uffdio_register.ioctls & expected_ioctls) != expected_ioctls) {
+ fprintf(stderr, "unexpected missing ioctl(s)\n");
+ exit(1);
+ }
+
+ /*
+ * After registering with UFFD, populate the non-UFFD-registered side of
+ * the shared mapping. This should *not* trigger any UFFD minor faults.
+ */
+ for (p = 0; p < nr_pages; ++p) {
+ memset(area_dst + (p * page_size), p % ((uint8_t)-1),
+ page_size);
+ }
+
+ if (pthread_create(&uffd_mon, &attr, uffd_poll_thread, &stats)) {
+ perror("uffd_poll_thread create");
+ exit(1);
+ }
+
+ /*
+ * Read each of the pages back using the UFFD-registered mapping. We
+ * expect that the first time we touch a page, it will result in a minor
+ * fault. uffd_poll_thread will resolve the fault by bit-flipping the
+ * page's contents, and then issuing a CONTINUE ioctl.
+ */
+
+ if (posix_memalign(&expected_page, page_size, page_size)) {
+ fprintf(stderr, "out of memory\n");
+ return 1;
+ }
+
+ for (p = 0; p < nr_pages; ++p) {
+ expected_byte = ~((uint8_t)(p % ((uint8_t)-1)));
+ memset(expected_page, expected_byte, page_size);
+ if (my_bcmp(expected_page, area_dst_alias + (p * page_size),
+ page_size)) {
+ fprintf(stderr,
+ "unexpected page contents after minor fault\n");
+ exit(1);
+ }
+ }
+
+ if (write(pipefd[1], &c, sizeof(c)) != sizeof(c)) {
+ perror("pipe write");
+ exit(1);
+ }
+ if (pthread_join(uffd_mon, NULL))
+ return 1;
+
+ close(uffd);
+
+ uffd_stats_report(&stats, 1);
+
+ return stats.missing_faults != 0 || stats.minor_faults != nr_pages;
+}
+
static int userfaultfd_stress(void)
{
void *area;
@@ -1413,7 +1563,7 @@ static int userfaultfd_stress(void)
close(uffd);
return userfaultfd_zeropage_test() || userfaultfd_sig_test()
- || userfaultfd_events_test();
+ || userfaultfd_events_test() || userfaultfd_minor_test();
}
/*
@@ -1454,6 +1604,8 @@ static void set_test_type(const char *type)
map_shared = true;
test_type = TEST_HUGETLB;
uffd_test_ops = &hugetlb_uffd_test_ops;
+ /* Minor faults require shared hugetlb; only enable here. */
+ test_uffdio_minor = true;
} else if (!strcmp(type, "shmem")) {
map_shared = true;
test_type = TEST_SHMEM;