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slab: link memcg caches of the same kind into a list

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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>
This commit is contained in:
Vladimir Davydov
2015-02-12 14:59:23 -08:00
committed by Linus Torvalds
parent f7ce3190c4
commit 426589f571
5 changed files with 41 additions and 33 deletions
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4
include/linux/slab.h
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@@ -491,9 +491,13 @@ struct memcg_cache_array {
*
* @memcg: pointer to the memcg this cache belongs to
* @root_cache: pointer to the global, root cache, this cache was derived from
*
* Both root and child caches of the same kind are linked into a list chained
* through @list.
*/
struct memcg_cache_params {
bool is_root_cache;
struct list_head list;
union {
struct memcg_cache_array __rcu *memcg_caches;
struct {