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slub: adjust memcg caches when creating cache alias 

Otherwise, kzalloc() called from a memcg won't clear the whole object.

Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Glauber Costa <glommer@gmail.com>
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 2014-04-07 15:39:29 -07:00 committed by Linus Torvalds
parent b8529907ba
commit 84d0ddd6b0
1 changed files with 13 additions and 0 deletions
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13
mm/slub.c
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@ -3748,7 +3748,11 @@ __kmem_cache_alias(const char *name, size_t size, size_t align,
s = find_mergeable(size, align, flags, name, ctor);
if (s) {
int i;
struct kmem_cache *c;
s->refcount++;
/*
* Adjust the object sizes so that we clear
* the complete object on kzalloc.
@ -3756,6 +3760,15 @@ __kmem_cache_alias(const char *name, size_t size, size_t align,
s->object_size = max(s->object_size, (int)size);
s->inuse = max_t(int, s->inuse, ALIGN(size, sizeof(void *)));
for_each_memcg_cache_index(i) {
c = cache_from_memcg_idx(s, i);
if (!c)
continue;
c->object_size = s->object_size;
c->inuse = max_t(int, c->inuse,
ALIGN(size, sizeof(void *)));
}
if (sysfs_slab_alias(s, name)) {
s->refcount--;
s = NULL;