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memcg: simplify and inline __mem_cgroup_from_kmem 

Before the previous patch ("memcg: unify slab and other kmem pages
charging"), __mem_cgroup_from_kmem had to handle two types of kmem - slab
pages and pages allocated with alloc_kmem_pages - memcg in the page
struct.  Now we can unify it.  Since after it, this function becomes tiny
we can fold it into mem_cgroup_from_kmem.

[hughd@google.com: move mem_cgroup_from_kmem into list_lru.c]
Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Vladimir Davydov 2015-11-05 18:49:04 -08:00 committed by Linus Torvalds
parent f3ccb2c422
commit df4065516b
3 changed files with 10 additions and 33 deletions
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15
include/linux/memcontrol.h
View File

@ -770,8 +770,6 @@ static inline int memcg_cache_id(struct mem_cgroup *memcg)
struct kmem_cache *__memcg_kmem_get_cache(struct kmem_cache *cachep);
void __memcg_kmem_put_cache(struct kmem_cache *cachep);
struct mem_cgroup *__mem_cgroup_from_kmem(void *ptr);
static inline bool __memcg_kmem_bypass(gfp_t gfp)
{
if (!memcg_kmem_enabled())
@ -830,13 +828,6 @@ static __always_inline void memcg_kmem_put_cache(struct kmem_cache *cachep)
if (memcg_kmem_enabled())
__memcg_kmem_put_cache(cachep);
}
static __always_inline struct mem_cgroup *mem_cgroup_from_kmem(void *ptr)
{
if (!memcg_kmem_enabled())
return NULL;
return __mem_cgroup_from_kmem(ptr);
}
#else
#define for_each_memcg_cache_index(_idx) \
for (; NULL; )
@ -882,11 +873,5 @@ memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
static inline void memcg_kmem_put_cache(struct kmem_cache *cachep)
{
}
static inline struct mem_cgroup *mem_cgroup_from_kmem(void *ptr)
{
return NULL;
}
#endif /* CONFIG_MEMCG_KMEM */
#endif /* _LINUX_MEMCONTROL_H */

10
mm/list_lru.c
View File

@ -63,6 +63,16 @@ list_lru_from_memcg_idx(struct list_lru_node *nlru, int idx)
return &nlru->lru;
}
static __always_inline struct mem_cgroup *mem_cgroup_from_kmem(void *ptr)
{
struct page *page;
if (!memcg_kmem_enabled())
return NULL;
page = virt_to_head_page(ptr);
return page->mem_cgroup;
}
static inline struct list_lru_one *
list_lru_from_kmem(struct list_lru_node *nlru, void *ptr)
{

18
mm/memcontrol.c
View File

@ -2430,24 +2430,6 @@ void __memcg_kmem_uncharge(struct page *page, int order)
page->mem_cgroup = NULL;
css_put_many(&memcg->css, nr_pages);
}
struct mem_cgroup *__mem_cgroup_from_kmem(void *ptr)
{
struct mem_cgroup *memcg = NULL;
struct kmem_cache *cachep;
struct page *page;
page = virt_to_head_page(ptr);
if (PageSlab(page)) {
cachep = page->slab_cache;
if (!is_root_cache(cachep))
memcg = cachep->memcg_params.memcg;
} else
/* page allocated by alloc_kmem_pages */
memcg = page->mem_cgroup;
return memcg;
}
#endif /* CONFIG_MEMCG_KMEM */
#ifdef CONFIG_TRANSPARENT_HUGEPAGE