The patch titled
Subject: mm/vmpressure.c: fix subtree pressure detection
has been added to the -mm tree. Its filename is
vmpressure-fix-subtree-pressure-detection.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/vmpressure-fix-subtree-pressure-detection.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/vmpressure-fix-subtree-pressure-detection.patch
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------------------------------------------------------
From: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Subject: mm/vmpressure.c: fix subtree pressure detection
When vmpressure is called for the entire subtree under pressure we
mistakenly use vmpressure->scanned instead of vmpressure->tree_scanned
when checking if vmpressure work is to be scheduled. This results in
suppressing all vmpressure events in the legacy cgroup hierarchy. Fix it.
Fixes: 8e8ae645249b ("mm: memcontrol: hook up vmpressure to socket pressure")
Signed-off-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmpressure.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff -puN mm/vmpressure.c~vmpressure-fix-subtree-pressure-detection mm/vmpressure.c
--- a/mm/vmpressure.c~vmpressure-fix-subtree-pressure-detection
+++ a/mm/vmpressure.c
@@ -248,9 +248,8 @@ void vmpressure(gfp_t gfp, struct mem_cg
if (tree) {
spin_lock(&vmpr->sr_lock);
- vmpr->tree_scanned += scanned;
+ scanned = vmpr->tree_scanned += scanned;
vmpr->tree_reclaimed += reclaimed;
- scanned = vmpr->scanned;
spin_unlock(&vmpr->sr_lock);
if (scanned < vmpressure_win)
_
Patches currently in -mm which might be from vdavydov@xxxxxxxxxxxxx are
vmpressure-fix-subtree-pressure-detection.patch
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