This is a note to let you know that I've just added the patch titled
mm, memcg: fix mem_cgroup_swapout() for THPs
to the 4.14-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-memcg-fix-mem_cgroup_swapout-for-thps.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d08afa149acfd00871484ada6dabc3880524cd1c Mon Sep 17 00:00:00 2001
From: Shakeel Butt <shakeelb@xxxxxxxxxx>
Date: Wed, 29 Nov 2017 16:11:15 -0800
Subject: mm, memcg: fix mem_cgroup_swapout() for THPs
From: Shakeel Butt <shakeelb@xxxxxxxxxx>
commit d08afa149acfd00871484ada6dabc3880524cd1c upstream.
Commit d6810d730022 ("memcg, THP, swap: make mem_cgroup_swapout()
support THP") changed mem_cgroup_swapout() to support transparent huge
page (THP).
However the patch missed one location which should be changed for
correctly handling THPs. The resulting bug will cause the memory
cgroups whose THPs were swapped out to become zombies on deletion.
Link: http://lkml.kernel.org/r/20171128161941.20931-1-shakeelb@xxxxxxxxxx
Fixes: d6810d730022 ("memcg, THP, swap: make mem_cgroup_swapout() support THP")
Signed-off-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Huang Ying <ying.huang@xxxxxxxxx>
Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
Cc: Greg Thelen <gthelen@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -6044,7 +6044,7 @@ void mem_cgroup_swapout(struct page *pag
memcg_check_events(memcg, page);
if (!mem_cgroup_is_root(memcg))
- css_put(&memcg->css);
+ css_put_many(&memcg->css, nr_entries);
}
/**
Patches currently in stable-queue which might be from shakeelb@xxxxxxxxxx are
queue-4.14/mm-memcg-fix-mem_cgroup_swapout-for-thps.patch