mm: workingset: fix premature shadow node shrinking with cgroups
authorJohannes Weiner <hannes@cmpxchg.org>
Fri, 31 Mar 2017 22:11:52 +0000 (15:11 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sat, 1 Apr 2017 00:13:30 +0000 (17:13 -0700)
commit0cefabdaf757a6455d75f00cb76874e62703ed18
tree183103dcc3063cbe8b4c2528c44aa99834a6063d
parent553af430e7c981e6e8fa5007c5b7b5773acc63dd
mm: workingset: fix premature shadow node shrinking with cgroups

Commit 0a6b76dd23fa ("mm: workingset: make shadow node shrinker memcg
aware") enabled cgroup-awareness in the shadow node shrinker, but forgot
to also enable cgroup-awareness in the list_lru the shadow nodes sit on.

Consequently, all shadow nodes are sitting on a global (per-NUMA node)
list, while the shrinker applies the limits according to the amount of
cache in the cgroup its shrinking.  The result is excessive pressure on
the shadow nodes from cgroups that have very little cache.

Enable memcg-mode on the shadow node LRUs, such that per-cgroup limits
are applied to per-cgroup lists.

Fixes: 0a6b76dd23fa ("mm: workingset: make shadow node shrinker memcg aware")
Link: http://lkml.kernel.org/r/20170322005320.8165-1-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Vladimir Davydov <vdavydov@tarantool.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: <stable@vger.kernel.org> [4.6+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/workingset.c