summaryrefslogtreecommitdiff
path: root/mm/percpu-internal.h
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2021-07-01 17:17:24 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-07-01 17:17:24 -0700
commite267992f9ef0bf717d70a9ee18049782f77e4b3a (patch)
tree6caf3664452672f41e8039f6af4279e2df709d66 /mm/percpu-internal.h
parent19b438592238b3b40c3f945bb5f9c4ca971c0c45 (diff)
parente4d777003a43feab2e000749163e531f6c48c385 (diff)
Merge branch 'for-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu
Pull percpu updates from Dennis Zhou: - percpu chunk depopulation - depopulate backing pages for chunks with empty pages when we exceed a global threshold without those pages. This lets us reclaim a portion of memory that would previously be lost until the full chunk would be freed (possibly never). - memcg accounting cleanup - previously separate chunks were managed for normal allocations and __GFP_ACCOUNT allocations. These are now consolidated which cleans up the code quite a bit. - a few misc clean ups for clang warnings * 'for-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu: percpu: optimize locking in pcpu_balance_workfn() percpu: initialize best_upa variable percpu: rework memcg accounting mm, memcg: introduce mem_cgroup_kmem_disabled() mm, memcg: mark cgroup_memory_nosocket, nokmem and noswap as __ro_after_init percpu: make symbol 'pcpu_free_slot' static percpu: implement partial chunk depopulation percpu: use pcpu_free_slot instead of pcpu_nr_slots - 1 percpu: factor out pcpu_check_block_hint() percpu: split __pcpu_balance_workfn() percpu: fix a comment about the chunks ordering
Diffstat (limited to 'mm/percpu-internal.h')
-rw-r--r--mm/percpu-internal.h56
1 files changed, 5 insertions, 51 deletions
diff --git a/mm/percpu-internal.h b/mm/percpu-internal.h
index ae26b118e246..639662c20c82 100644
--- a/mm/percpu-internal.h
+++ b/mm/percpu-internal.h
@@ -6,25 +6,6 @@
#include <linux/percpu.h>
/*
- * There are two chunk types: root and memcg-aware.
- * Chunks of each type have separate slots list.
- *
- * Memcg-aware chunks have an attached vector of obj_cgroup pointers, which is
- * used to store memcg membership data of a percpu object. Obj_cgroups are
- * ref-counted pointers to a memory cgroup with an ability to switch dynamically
- * to the parent memory cgroup. This allows to reclaim a deleted memory cgroup
- * without reclaiming of all outstanding objects, which hold a reference at it.
- */
-enum pcpu_chunk_type {
- PCPU_CHUNK_ROOT,
-#ifdef CONFIG_MEMCG_KMEM
- PCPU_CHUNK_MEMCG,
-#endif
- PCPU_NR_CHUNK_TYPES,
- PCPU_FAIL_ALLOC = PCPU_NR_CHUNK_TYPES
-};
-
-/*
* pcpu_block_md is the metadata block struct.
* Each chunk's bitmap is split into a number of full blocks.
* All units are in terms of bits.
@@ -67,6 +48,8 @@ struct pcpu_chunk {
void *data; /* chunk data */
bool immutable; /* no [de]population allowed */
+ bool isolated; /* isolated from active chunk
+ slots */
int start_offset; /* the overlap with the previous
region to have a page aligned
base_addr */
@@ -87,7 +70,9 @@ extern spinlock_t pcpu_lock;
extern struct list_head *pcpu_chunk_lists;
extern int pcpu_nr_slots;
-extern int pcpu_nr_empty_pop_pages[];
+extern int pcpu_sidelined_slot;
+extern int pcpu_to_depopulate_slot;
+extern int pcpu_nr_empty_pop_pages;
extern struct pcpu_chunk *pcpu_first_chunk;
extern struct pcpu_chunk *pcpu_reserved_chunk;
@@ -128,37 +113,6 @@ static inline int pcpu_chunk_map_bits(struct pcpu_chunk *chunk)
return pcpu_nr_pages_to_map_bits(chunk->nr_pages);
}
-#ifdef CONFIG_MEMCG_KMEM
-static inline enum pcpu_chunk_type pcpu_chunk_type(struct pcpu_chunk *chunk)
-{
- if (chunk->obj_cgroups)
- return PCPU_CHUNK_MEMCG;
- return PCPU_CHUNK_ROOT;
-}
-
-static inline bool pcpu_is_memcg_chunk(enum pcpu_chunk_type chunk_type)
-{
- return chunk_type == PCPU_CHUNK_MEMCG;
-}
-
-#else
-static inline enum pcpu_chunk_type pcpu_chunk_type(struct pcpu_chunk *chunk)
-{
- return PCPU_CHUNK_ROOT;
-}
-
-static inline bool pcpu_is_memcg_chunk(enum pcpu_chunk_type chunk_type)
-{
- return false;
-}
-#endif
-
-static inline struct list_head *pcpu_chunk_list(enum pcpu_chunk_type chunk_type)
-{
- return &pcpu_chunk_lists[pcpu_nr_slots *
- pcpu_is_memcg_chunk(chunk_type)];
-}
-
#ifdef CONFIG_PERCPU_STATS
#include <linux/spinlock.h>