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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/slab.c
parentf7ce3190c4a35bf887adb7a1aa1ba899b679872d (diff)
downloadlinux-426589f571f7d6d5ab2ca33ece73164149279ca1.tar.bz2
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/slab.c')
-rw-r--r--mm/slab.c13
1 files changed, 5 insertions, 8 deletions
diff --git a/mm/slab.c b/mm/slab.c
index 65b5dcb6f671..7894017bc160 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3708,8 +3708,7 @@ static int do_tune_cpucache(struct kmem_cache *cachep, int limit,
int batchcount, int shared, gfp_t gfp)
{
int ret;
- struct kmem_cache *c = NULL;
- int i = 0;
+ struct kmem_cache *c;
ret = __do_tune_cpucache(cachep, limit, batchcount, shared, gfp);
@@ -3719,12 +3718,10 @@ static int do_tune_cpucache(struct kmem_cache *cachep, int limit,
if ((ret < 0) || !is_root_cache(cachep))
return ret;
- VM_BUG_ON(!mutex_is_locked(&slab_mutex));
- for_each_memcg_cache_index(i) {
- c = cache_from_memcg_idx(cachep, i);
- if (c)
- /* return value determined by the parent cache only */
- __do_tune_cpucache(c, limit, batchcount, shared, gfp);
+ lockdep_assert_held(&slab_mutex);
+ for_each_memcg_cache(c, cachep) {
+ /* return value determined by the root cache only */
+ __do_tune_cpucache(c, limit, batchcount, shared, gfp);
}
return ret;