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memcg: get rid of memcg_create_cache_name

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Instead of calling back to memcontrol.c from kmem_cache_create_memcg in
order to just create the name of a per memcg cache, let's allocate it in
place.  We only need to pass the memcg name to kmem_cache_create_memcg for
that - everything else can be done in slab_common.c.

Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vladimir Davydov
2014-06-04 16:08:23 -07:00
committed by Linus Torvalds
parent b5ffc8560c
commit 073ee1c6cd
4 changed files with 16 additions and 29 deletions
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mm/slab_common.c
+5 -2
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@@ -264,13 +264,15 @@ EXPORT_SYMBOL(kmem_cache_create);
* kmem_cache_create_memcg - Create a cache for a memory cgroup.
* @memcg: The memory cgroup the new cache is for.
* @root_cache: The parent of the new cache.
* @memcg_name: The name of the memory cgroup (used for naming the new cache).
*
* This function attempts to create a kmem cache that will serve allocation
* requests going from @memcg to @root_cache. The new cache inherits properties
* from its parent.
*/
struct kmem_cache *kmem_cache_create_memcg(struct mem_cgroup *memcg,
struct kmem_cache *root_cache)
struct kmem_cache *root_cache,
const char *memcg_name)
{
struct kmem_cache *s = NULL;
char *cache_name;
@@ -280,7 +282,8 @@ struct kmem_cache *kmem_cache_create_memcg(struct mem_cgroup *memcg,
mutex_lock(&slab_mutex);
cache_name = memcg_create_cache_name(memcg, root_cache);
cache_name = kasprintf(GFP_KERNEL, "%s(%d:%s)", root_cache->name,
memcg_cache_id(memcg), memcg_name);
if (!cache_name)
goto out_unlock;