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 <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Johannes Weiner <[email protected]> Cc: David Rientjes <[email protected]> Cc: Pekka Enberg <[email protected]> Cc: Glauber Costa <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
laijs · Apr 7, 2014 · 84d0ddd · 84d0ddd
1 parent b852990
commit 84d0ddd
Showing 1 changed file with 13 additions and 0 deletions.
diff --git a/mm/slub.c b/mm/slub.c
@@ -3748,14 +3748,27 @@ __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.
 		 */
 		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;