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authorRoman Gushchin <roman.gushchin@linux.dev>2023-02-13 22:29:22 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-02-17 07:43:56 +0300
commitf7a449f779608efe1941a0e0c4bd7b5f57000be7 (patch)
treef8f97a44778de08a806b9e06a4c54e331273a043 /mm
parentb4fb12e6c74791ac4c5c98b845628c576366b889 (diff)
downloadlinux-f7a449f779608efe1941a0e0c4bd7b5f57000be7.tar.xz
mm: memcontrol: rename memcg_kmem_enabled()
Currently there are two kmem-related helper functions with a confusing semantics: memcg_kmem_enabled() and mem_cgroup_kmem_disabled(). The problem is that an obvious expectation memcg_kmem_enabled() == !mem_cgroup_kmem_disabled(), can be false. mem_cgroup_kmem_disabled() is similar to mem_cgroup_disabled(): it returns true only if CONFIG_MEMCG_KMEM is not set or the kmem accounting is disabled using a boot time kernel option "cgroup.memory=nokmem". It never changes the value dynamically. memcg_kmem_enabled() is different: it always returns false until the first non-root memory cgroup will get online (assuming the kernel memory accounting is enabled). It's goal is to improve the performance on systems without the cgroupfs mounted/memory controller enabled or on the systems with only the root memory cgroup. To make things more obvious and avoid potential bugs, let's rename memcg_kmem_enabled() to memcg_kmem_online(). Link: https://lkml.kernel.org/r/20230213192922.1146370-1-roman.gushchin@linux.dev Signed-off-by: Roman Gushchin <roman.gushchin@linux.dev> Acked-by: Muchun Song <songmuchun@bytedance.com> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Shakeel Butt <shakeelb@google.com> Cc: Dennis Zhou <dennis@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memcontrol.c8
-rw-r--r--mm/page_alloc.c8
-rw-r--r--mm/percpu.c2
-rw-r--r--mm/slab.h10
-rw-r--r--mm/vmscan.c2
5 files changed, 15 insertions, 15 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 17335459d8dc..3e3cdb9bed95 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -345,8 +345,8 @@ static void memcg_reparent_objcgs(struct mem_cgroup *memcg,
* conditional to this static branch, we'll have to allow modules that does
* kmem_cache_alloc and the such to see this symbol as well
*/
-DEFINE_STATIC_KEY_FALSE(memcg_kmem_enabled_key);
-EXPORT_SYMBOL(memcg_kmem_enabled_key);
+DEFINE_STATIC_KEY_FALSE(memcg_kmem_online_key);
+EXPORT_SYMBOL(memcg_kmem_online_key);
#endif
/**
@@ -3034,7 +3034,7 @@ struct obj_cgroup *get_obj_cgroup_from_page(struct page *page)
{
struct obj_cgroup *objcg;
- if (!memcg_kmem_enabled())
+ if (!memcg_kmem_online())
return NULL;
if (PageMemcgKmem(page)) {
@@ -3746,7 +3746,7 @@ static int memcg_online_kmem(struct mem_cgroup *memcg)
objcg->memcg = memcg;
rcu_assign_pointer(memcg->objcg, objcg);
- static_branch_enable(&memcg_kmem_enabled_key);
+ static_branch_enable(&memcg_kmem_online_key);
memcg->kmemcg_id = memcg->id.id;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 4b6bcec41c8f..4c9ab8b93b1a 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1410,7 +1410,7 @@ static __always_inline bool free_pages_prepare(struct page *page,
* Do not let hwpoison pages hit pcplists/buddy
* Untie memcg state and reset page's owner
*/
- if (memcg_kmem_enabled() && PageMemcgKmem(page))
+ if (memcg_kmem_online() && PageMemcgKmem(page))
__memcg_kmem_uncharge_page(page, order);
reset_page_owner(page, order);
page_table_check_free(page, order);
@@ -1441,7 +1441,7 @@ static __always_inline bool free_pages_prepare(struct page *page,
}
if (PageMappingFlags(page))
page->mapping = NULL;
- if (memcg_kmem_enabled() && PageMemcgKmem(page))
+ if (memcg_kmem_online() && PageMemcgKmem(page))
__memcg_kmem_uncharge_page(page, order);
if (check_free && free_page_is_bad(page))
bad++;
@@ -5432,7 +5432,7 @@ unsigned long __alloc_pages_bulk(gfp_t gfp, int preferred_nid,
goto out;
/* Bulk allocator does not support memcg accounting. */
- if (memcg_kmem_enabled() && (gfp & __GFP_ACCOUNT))
+ if (memcg_kmem_online() && (gfp & __GFP_ACCOUNT))
goto failed;
/* Use the single page allocator for one page. */
@@ -5604,7 +5604,7 @@ struct page *__alloc_pages(gfp_t gfp, unsigned int order, int preferred_nid,
page = __alloc_pages_slowpath(alloc_gfp, order, &ac);
out:
- if (memcg_kmem_enabled() && (gfp & __GFP_ACCOUNT) && page &&
+ if (memcg_kmem_online() && (gfp & __GFP_ACCOUNT) && page &&
unlikely(__memcg_kmem_charge_page(page, gfp, order) != 0)) {
__free_pages(page, order);
page = NULL;
diff --git a/mm/percpu.c b/mm/percpu.c
index acd78da0493b..28e07ede46f6 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1625,7 +1625,7 @@ static bool pcpu_memcg_pre_alloc_hook(size_t size, gfp_t gfp,
{
struct obj_cgroup *objcg;
- if (!memcg_kmem_enabled() || !(gfp & __GFP_ACCOUNT))
+ if (!memcg_kmem_online() || !(gfp & __GFP_ACCOUNT))
return true;
objcg = get_obj_cgroup_from_current();
diff --git a/mm/slab.h b/mm/slab.h
index 63fb4c00d529..43966aa5fadf 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -494,7 +494,7 @@ static inline bool memcg_slab_pre_alloc_hook(struct kmem_cache *s,
{
struct obj_cgroup *objcg;
- if (!memcg_kmem_enabled())
+ if (!memcg_kmem_online())
return true;
if (!(flags & __GFP_ACCOUNT) && !(s->flags & SLAB_ACCOUNT))
@@ -535,7 +535,7 @@ static inline void memcg_slab_post_alloc_hook(struct kmem_cache *s,
unsigned long off;
size_t i;
- if (!memcg_kmem_enabled() || !objcg)
+ if (!memcg_kmem_online() || !objcg)
return;
for (i = 0; i < size; i++) {
@@ -567,7 +567,7 @@ static inline void memcg_slab_free_hook(struct kmem_cache *s, struct slab *slab,
struct obj_cgroup **objcgs;
int i;
- if (!memcg_kmem_enabled())
+ if (!memcg_kmem_online())
return;
objcgs = slab_objcgs(slab);
@@ -649,7 +649,7 @@ static inline struct kmem_cache *virt_to_cache(const void *obj)
static __always_inline void account_slab(struct slab *slab, int order,
struct kmem_cache *s, gfp_t gfp)
{
- if (memcg_kmem_enabled() && (s->flags & SLAB_ACCOUNT))
+ if (memcg_kmem_online() && (s->flags & SLAB_ACCOUNT))
memcg_alloc_slab_cgroups(slab, s, gfp, true);
mod_node_page_state(slab_pgdat(slab), cache_vmstat_idx(s),
@@ -659,7 +659,7 @@ static __always_inline void account_slab(struct slab *slab, int order,
static __always_inline void unaccount_slab(struct slab *slab, int order,
struct kmem_cache *s)
{
- if (memcg_kmem_enabled())
+ if (memcg_kmem_online())
memcg_free_slab_cgroups(slab);
mod_node_page_state(slab_pgdat(slab), cache_vmstat_idx(s),
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 34535bbd4fe9..098c79129c42 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -915,7 +915,7 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid,
}
/* Call non-slab shrinkers even though kmem is disabled */
- if (!memcg_kmem_enabled() &&
+ if (!memcg_kmem_online() &&
!(shrinker->flags & SHRINKER_NONSLAB))
continue;