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%3Ba=su...

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@vger.kernel.org know about it.

From d08afa149acfd00871484ada6dabc3880524cd1c Mon Sep 17 00:00:00 2001

From: Shakeel Butt shakeelb@google.com Date: Wed, 29 Nov 2017 16:11:15 -0800 Subject: mm, memcg: fix mem_cgroup_swapout() for THPs

From: Shakeel Butt shakeelb@google.com

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@google.com Fixes: d6810d730022 ("memcg, THP, swap: make mem_cgroup_swapout() support THP") Signed-off-by: Shakeel Butt shakeelb@google.com Acked-by: Johannes Weiner hannes@cmpxchg.org Acked-by: Michal Hocko mhocko@suse.com Cc: Huang Ying ying.huang@intel.com Cc: Vladimir Davydov vdavydov.dev@gmail.com Cc: Greg Thelen gthelen@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org

--- 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@google.com are

queue-4.14/mm-memcg-fix-mem_cgroup_swapout-for-thps.patch