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mm: memcontrol: rename memcg_kmem_enabled()

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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>
This commit is contained in:
Roman Gushchin 2023-02-13 11:29:22 -08:00 committed by Andrew Morton
parent b4fb12e6c7
commit f7a449f779
6 changed files with 22 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
include/linux/memcontrol.h
View File

@ -1776,24 +1776,24 @@ struct obj_cgroup *get_obj_cgroup_from_page(struct page *page);
int obj_cgroup_charge(struct obj_cgroup *objcg, gfp_t gfp, size_t size);
void obj_cgroup_uncharge(struct obj_cgroup *objcg, size_t size);
extern struct static_key_false memcg_kmem_enabled_key;
extern struct static_key_false memcg_kmem_online_key;
static inline bool memcg_kmem_enabled(void)
static inline bool memcg_kmem_online(void)
{
return static_branch_likely(&memcg_kmem_enabled_key);
return static_branch_likely(&memcg_kmem_online_key);
}
static inline int memcg_kmem_charge_page(struct page *page, gfp_t gfp,
int order)
{
if (memcg_kmem_enabled())
if (memcg_kmem_online())
return __memcg_kmem_charge_page(page, gfp, order);
return 0;
}
static inline void memcg_kmem_uncharge_page(struct page *page, int order)
{
if (memcg_kmem_enabled())
if (memcg_kmem_online())
__memcg_kmem_uncharge_page(page, order);
}
@ -1814,7 +1814,7 @@ static inline void count_objcg_event(struct obj_cgroup *objcg,
{
struct mem_cgroup *memcg;
if (!memcg_kmem_enabled())
if (!memcg_kmem_online())
return;
rcu_read_lock();
@ -1854,7 +1854,7 @@ static inline struct obj_cgroup *get_obj_cgroup_from_page(struct page *page)
return NULL;
}
static inline bool memcg_kmem_enabled(void)
static inline bool memcg_kmem_online(void)
{
return false;
}

8
mm/memcontrol.c
View File

@ -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;

8
mm/page_alloc.c
View File

@ -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;

2
mm/percpu.c
View File

@ -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();

10
mm/slab.h
View File

@ -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),

2
mm/vmscan.c
View File

@ -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;