This is a note to let you know that I've just added the patch titled
mm: workingset: fix premature shadow node shrinking with cgroups
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-workingset-fix-premature-shadow-node-shrinking-with-cgroups.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0cefabdaf757a6455d75f00cb76874e62703ed18 Mon Sep 17 00:00:00 2001
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Date: Fri, 31 Mar 2017 15:11:52 -0700
Subject: mm: workingset: fix premature shadow node shrinking with cgroups
From: Johannes Weiner <hannes@xxxxxxxxxxx>
commit 0cefabdaf757a6455d75f00cb76874e62703ed18 upstream.
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@xxxxxxxxxxx
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Acked-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/workingset.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -492,7 +492,7 @@ static int __init workingset_init(void)
pr_info("workingset: timestamp_bits=%d max_order=%d bucket_order=%u\n",
timestamp_bits, max_order, bucket_order);
- ret = list_lru_init_key(&workingset_shadow_nodes, &shadow_nodes_key);
+ ret = __list_lru_init(&workingset_shadow_nodes, true, &shadow_nodes_key);
if (ret)
goto err;
ret = register_shrinker(&workingset_shadow_shrinker);
Patches currently in stable-queue which might be from hannes@xxxxxxxxxxx are
queue-4.9/mm-rmap-fix-huge-file-mmap-accounting-in-the-memcg-stats.patch
queue-4.9/mm-workingset-fix-premature-shadow-node-shrinking-with-cgroups.patch