From: Vladimir Davydov <vdavydov@parallels.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@suse.cz>
Subject: [PATCH] memcg: do not call reclaim if !__GFP_WAIT
Date: Thu, 28 May 2015 20:26:06 +0300 [thread overview]
Message-ID: <1432833966-25538-1-git-send-email-vdavydov@parallels.com> (raw)
When trimming memcg consumption excess (see memory.high), we call
try_to_free_mem_cgroup_pages without checking if we are allowed to sleep
in the current context, which can result in a deadlock. Fix this.
Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
---
mm/memcontrol.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 14c2f2017e37..9da23a7ec4c0 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2323,6 +2323,8 @@ done_restock:
css_get_many(&memcg->css, batch);
if (batch > nr_pages)
refill_stock(memcg, batch - nr_pages);
+ if (!(gfp_mask & __GFP_WAIT))
+ goto done;
/*
* If the hierarchy is above the normal consumption range,
* make the charging task trim their excess contribution.
--
2.1.4
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next reply other threads:[~2015-05-28 17:26 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-28 17:26 Vladimir Davydov [this message]
2015-05-28 18:13 ` [PATCH] memcg: do not call reclaim if !__GFP_WAIT Michal Hocko
2015-05-28 19:59 ` Andrew Morton
2015-05-29 6:55 ` Michal Hocko
2015-06-01 16:42 ` Vlastimil Babka
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