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Merge branch 'for-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu

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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
This commit is contained in:
Linus Torvalds
2021-07-01 17:17:24 -07:00
parent 19b4385922 e4d777003a
commit e267992f9e
7 changed files with 343 additions and 186 deletions
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5
include/linux/memcontrol.h
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@@ -1619,6 +1619,7 @@ static inline void set_shrinker_bit(struct mem_cgroup *memcg,
#endif
#ifdef CONFIG_MEMCG_KMEM
bool mem_cgroup_kmem_disabled(void);
int __memcg_kmem_charge_page(struct page *page, gfp_t gfp, int order);
void __memcg_kmem_uncharge_page(struct page *page, int order);
@@ -1672,6 +1673,10 @@ static inline int memcg_cache_id(struct mem_cgroup *memcg)
struct mem_cgroup *mem_cgroup_from_obj(void *p);
#else
static inline bool mem_cgroup_kmem_disabled(void)
{
return true;
}
static inline int memcg_kmem_charge_page(struct page *page, gfp_t gfp,
int order)