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authorMuchun Song <songmuchun@bytedance.com>2022-04-28 23:16:03 -0700
committerakpm <akpm@linux-foundation.org>2022-04-28 23:16:03 -0700
commit2e4ec02bbcc05b8905d65c763ebde6bc85508e90 (patch)
tree24351c789353f096f1c89cd3af7a53c0971403bb
parent84448c8ecd9a130e8cddef5c585446c5520e774b (diff)
mm: hugetlb_vmemmap: introduce ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP
The feature of minimizing overhead of struct page associated with each HugeTLB page is implemented on x86_64, however, the infrastructure of this feature is already there, we could easily enable it for other architectures. Introduce ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP for other architectures to be easily enabled. Just select this config if they want to enable this feature. Link: https://lkml.kernel.org/r/20220331065640.5777-1-songmuchun@bytedance.com Signed-off-by: Muchun Song <songmuchun@bytedance.com> Suggested-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Barry Song <baohua@kernel.org> Tested-by: Barry Song <baohua@kernel.org> Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Bodeddula Balasubramaniam <bodeddub@amazon.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: David Hildenbrand <david@redhat.com> Cc: David Rientjes <rientjes@google.com> Cc: Fam Zheng <fam.zheng@bytedance.com> Cc: James Morse <james.morse@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Will Deacon <will@kernel.org> Cc: Xiongchun Duan <duanxiongchun@bytedance.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
-rw-r--r--arch/x86/Kconfig1
-rw-r--r--fs/Kconfig10
2 files changed, 10 insertions, 1 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index b0142e01002e..ae4e1a79a1e2 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -121,6 +121,7 @@ config X86
select ARCH_WANTS_NO_INSTR
select ARCH_WANT_GENERAL_HUGETLB
select ARCH_WANT_HUGE_PMD_SHARE
+ select ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP if X86_64
select ARCH_WANT_LD_ORPHAN_WARN
select ARCH_WANTS_THP_SWAP if X86_64
select ARCH_HAS_PARANOID_L1D_FLUSH
diff --git a/fs/Kconfig b/fs/Kconfig
index 30b751c7f11a..8f6ab1cf5115 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -245,9 +245,17 @@ config HUGETLBFS
config HUGETLB_PAGE
def_bool HUGETLBFS
+#
+# Select this config option from the architecture Kconfig, if it is preferred
+# to enable the feature of minimizing overhead of struct page associated with
+# each HugeTLB page.
+#
+config ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP
+ bool
+
config HUGETLB_PAGE_FREE_VMEMMAP
def_bool HUGETLB_PAGE
- depends on X86_64
+ depends on ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP
depends on SPARSEMEM_VMEMMAP
config HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON