Commit 61b76d7a authored by Johannes Weiner's avatar Johannes Weiner Committed by Greg Kroah-Hartman

mm: workingset: fix premature shadow node shrinking with cgroups

commit 0cefabda upstream.

Commit 0a6b76dd ("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: 0a6b76dd ("mm: workingset: make shadow node shrinker memcg aware")
Link: http://lkml.kernel.org/r/20170322005320.8165-1-hannes@cmpxchg.orgSigned-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Acked-by: default avatarVladimir Davydov <vdavydov@tarantool.org>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9f424db1
...@@ -533,7 +533,7 @@ static int __init workingset_init(void) ...@@ -533,7 +533,7 @@ static int __init workingset_init(void)
pr_info("workingset: timestamp_bits=%d max_order=%d bucket_order=%u\n", pr_info("workingset: timestamp_bits=%d max_order=%d bucket_order=%u\n",
timestamp_bits, max_order, bucket_order); timestamp_bits, max_order, bucket_order);
ret = list_lru_init_key(&shadow_nodes, &shadow_nodes_key); ret = __list_lru_init(&shadow_nodes, true, &shadow_nodes_key);
if (ret) if (ret)
goto err; goto err;
ret = register_shrinker(&workingset_shadow_shrinker); ret = register_shrinker(&workingset_shadow_shrinker);
......
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