[merged] mm-vmstat-fix-wrong-wq-sleep-when-memory-reclaim-doesnt-make-any-progress.patch removed from -mm tree

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The patch titled
     Subject: mm, vmstat: fix wrong WQ sleep when memory reclaim doesn't make any progress
has been removed from the -mm tree.  Its filename was
     mm-vmstat-fix-wrong-wq-sleep-when-memory-reclaim-doesnt-make-any-progress.patch

This patch was dropped because it was merged into mainline or a subsystem tree

------------------------------------------------------
From: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Subject: mm, vmstat: fix wrong WQ sleep when memory reclaim doesn't make any progress

Jan Stancek has reported that system occasionally hanging after "oom01"
testcase from LTP triggers OOM.  Guessing from a result that there is a
kworker thread doing memory allocation and the values between "Node 0
Normal free:" and "Node 0 Normal:" differs when hanging, vmstat is not
up-to-date for some reason.

According to commit 373ccbe59270 ("mm, vmstat: allow WQ concurrency to
discover memory reclaim doesn't make any progress"), it meant to force the
kworker thread to take a short sleep, but it by error used
schedule_timeout(1).  We missed that schedule_timeout() in state
TASK_RUNNING doesn't do anything.

Fix it by using schedule_timeout_uninterruptible(1) which forces the
kworker thread to take a short sleep in order to make sure that vmstat is
up-to-date.

Fixes: 373ccbe59270 ("mm, vmstat: allow WQ concurrency to discover memory reclaim doesn't make any progress")
Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Reported-by: Jan Stancek <jstancek@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Cristopher Lameter <clameter@xxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Arkadiusz Miskiewicz <arekm@xxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/backing-dev.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN mm/backing-dev.c~mm-vmstat-fix-wrong-wq-sleep-when-memory-reclaim-doesnt-make-any-progress mm/backing-dev.c
--- a/mm/backing-dev.c~mm-vmstat-fix-wrong-wq-sleep-when-memory-reclaim-doesnt-make-any-progress
+++ a/mm/backing-dev.c
@@ -989,7 +989,7 @@ long wait_iff_congested(struct zone *zon
 		 * here rather than calling cond_resched().
 		 */
 		if (current->flags & PF_WQ_WORKER)
-			schedule_timeout(1);
+			schedule_timeout_uninterruptible(1);
 		else
 			cond_resched();
 
_

Patches currently in -mm which might be from penguin-kernel@xxxxxxxxxxxxxxxxxxx are


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