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authorVladimir Davydov <vdavydov@parallels.com>2015-02-12 14:59:23 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-12 18:54:09 -0800
commit426589f571f7d6d5ab2ca33ece73164149279ca1 (patch)
tree9b9c94fad5bd7bb8330d8c9b4c510479b75c5588 /mm/slub.c
parentf7ce3190c4a35bf887adb7a1aa1ba899b679872d (diff)
downloadop-kernel-dev-426589f571f7d6d5ab2ca33ece73164149279ca1.zip
op-kernel-dev-426589f571f7d6d5ab2ca33ece73164149279ca1.tar.gz
slab: link memcg caches of the same kind into a list
Sometimes, we need to iterate over all memcg copies of a particular root kmem cache. Currently, we use memcg_cache_params->memcg_caches array for that, because it contains all existing memcg caches. However, it's a bad practice to keep all caches, including those that belong to offline cgroups, in this array, because it will be growing beyond any bounds then. I'm going to wipe away dead caches from it to save space. To still be able to perform iterations over all memcg caches of the same kind, let us link them into a list. Signed-off-by: Vladimir Davydov <vdavydov@parallels.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: Tejun Heo <tj@kernel.org> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Dave Chinner <david@fromorbit.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slub.c')
-rw-r--r--mm/slub.c19
1 files changed, 5 insertions, 14 deletions
diff --git a/mm/slub.c b/mm/slub.c
index 75d55fd..1e5a463 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3636,13 +3636,10 @@ struct kmem_cache *
__kmem_cache_alias(const char *name, size_t size, size_t align,
unsigned long flags, void (*ctor)(void *))
{
- struct kmem_cache *s;
+ struct kmem_cache *s, *c;
s = find_mergeable(size, align, flags, name, ctor);
if (s) {
- int i;
- struct kmem_cache *c;
-
s->refcount++;
/*
@@ -3652,10 +3649,7 @@ __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;
+ for_each_memcg_cache(c, s) {
c->object_size = s->object_size;
c->inuse = max_t(int, c->inuse,
ALIGN(size, sizeof(void *)));
@@ -4921,7 +4915,7 @@ static ssize_t slab_attr_store(struct kobject *kobj,
err = attribute->store(s, buf, len);
#ifdef CONFIG_MEMCG_KMEM
if (slab_state >= FULL && err >= 0 && is_root_cache(s)) {
- int i;
+ struct kmem_cache *c;
mutex_lock(&slab_mutex);
if (s->max_attr_size < len)
@@ -4944,11 +4938,8 @@ static ssize_t slab_attr_store(struct kobject *kobj,
* directly either failed or succeeded, in which case we loop
* through the descendants with best-effort propagation.
*/
- for_each_memcg_cache_index(i) {
- struct kmem_cache *c = cache_from_memcg_idx(s, i);
- if (c)
- attribute->store(c, buf, len);
- }
+ for_each_memcg_cache(c, s)
+ attribute->store(c, buf, len);
mutex_unlock(&slab_mutex);
}
#endif
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