This is a note to let you know that I've just added the patch titled
mm, swap_cgroup: reschedule when neeed in swap_cgroup_swapoff()
to the 4.4-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-swap_cgroup-reschedule-when-neeed-in-swap_cgroup_swapoff.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 460bcec84e11c75122ace5976214abbc596eb91b Mon Sep 17 00:00:00 2001
From: David Rientjes <rientjes@xxxxxxxxxx>
Date: Fri, 7 Apr 2017 16:05:00 -0700
Subject: mm, swap_cgroup: reschedule when neeed in swap_cgroup_swapoff()
From: David Rientjes <rientjes@xxxxxxxxxx>
commit 460bcec84e11c75122ace5976214abbc596eb91b upstream.
We got need_resched() warnings in swap_cgroup_swapoff() because
swap_cgroup_ctrl[type].length is particularly large.
Reschedule when needed.
Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1704061315270.80559@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/swap_cgroup.c | 2 ++
1 file changed, 2 insertions(+)
--- a/mm/swap_cgroup.c
+++ b/mm/swap_cgroup.c
@@ -205,6 +205,8 @@ void swap_cgroup_swapoff(int type)
struct page *page = map[i];
if (page)
__free_page(page);
+ if (!(i % SWAP_CLUSTER_MAX))
+ cond_resched();
}
vfree(map);
}
Patches currently in stable-queue which might be from rientjes@xxxxxxxxxx are
queue-4.4/mm-swap_cgroup-reschedule-when-neeed-in-swap_cgroup_swapoff.patch