From: Vladimir Davydov <vdavydov@virtuozzo.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@kernel.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: [PATCH] vmpressure: Fix subtree pressure detection
Date: Wed, 27 Jan 2016 19:28:57 +0300 [thread overview]
Message-ID: <1453912137-25473-1-git-send-email-vdavydov@virtuozzo.com> (raw)
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@virtuozzo.com>
---
mm/vmpressure.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/mm/vmpressure.c b/mm/vmpressure.c
index 9a6c0704211c..149fdf6c5c56 100644
--- a/mm/vmpressure.c
+++ b/mm/vmpressure.c
@@ -248,9 +248,8 @@ void vmpressure(gfp_t gfp, struct mem_cgroup *memcg, bool tree,
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)
--
2.1.4
--
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next reply other threads:[~2016-01-27 16:29 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-27 16:28 Vladimir Davydov [this message]
2016-01-27 18:47 ` [PATCH] vmpressure: Fix subtree pressure detection Johannes Weiner
2016-01-28 15:55 ` Michal Hocko
2016-01-28 19:24 ` Vlastimil Babka
2016-01-29 8:37 ` Vladimir Davydov
2016-02-02 6:32 ` Andrew Morton
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