From: Glauber Costa <glommer@parallels.com>
To: cgroups@vger.kernel.org
Cc: linux-mm@kvack.org, Tejun Heo <tj@kernel.org>,
Michal Hocko <mhocko@suse.cz>,
Johannes Weiner <hannes@cmpxchg.org>,
kamezawa.hiroyu@jp.fujitsu.com,
Glauber Costa <glommer@parallels.com>
Subject: [PATCH v4 6/6] memcg: avoid dangling reference count in creation failure.
Date: Tue, 22 Jan 2013 17:47:41 +0400 [thread overview]
Message-ID: <1358862461-18046-7-git-send-email-glommer@parallels.com> (raw)
In-Reply-To: <1358862461-18046-1-git-send-email-glommer@parallels.com>
When use_hierarchy is enabled, we acquire an extra reference count
in our parent during cgroup creation. We don't release it, though,
if any failure exist in the creation process.
Signed-off-by: Glauber Costa <glommer@parallels.com>
Reported-by: 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 357324c..72a008e 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -6166,6 +6166,8 @@ mem_cgroup_css_online(struct cgroup *cont)
* call __mem_cgroup_free, so return directly
*/
mem_cgroup_put(memcg);
+ if (parent->use_hierarchy)
+ mem_cgroup_put(parent);
}
return error;
}
--
1.8.1
--
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next prev parent reply other threads:[~2013-01-22 13:47 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-22 13:47 [PATCH v4 0/6] replace cgroup_lock with memcg specific locking Glauber Costa
2013-01-22 13:47 ` [PATCH v4 1/6] memcg: prevent changes to move_charge_at_immigrate during task attach Glauber Costa
2013-01-29 0:11 ` Kamezawa Hiroyuki
2013-01-22 13:47 ` [PATCH v4 2/6] memcg: split part of memcg creation to css_online Glauber Costa
2013-01-25 23:52 ` Andrew Morton
2013-01-28 8:35 ` Lord Glauber Costa of Sealand
2013-01-29 0:12 ` Kamezawa Hiroyuki
2013-01-22 13:47 ` [PATCH v4 3/6] memcg: fast hierarchy-aware child test Glauber Costa
2013-01-25 23:59 ` Andrew Morton
2013-01-28 8:30 ` Lord Glauber Costa of Sealand
2013-01-29 0:14 ` Kamezawa Hiroyuki
2013-01-22 13:47 ` [PATCH v4 4/6] memcg: replace cgroup_lock with memcg specific memcg_lock Glauber Costa
2013-01-22 14:00 ` Michal Hocko
2013-01-29 0:16 ` Kamezawa Hiroyuki
2013-01-22 13:47 ` [PATCH v4 5/6] memcg: increment static branch right after limit set Glauber Costa
2013-01-29 0:18 ` Kamezawa Hiroyuki
2013-01-22 13:47 ` Glauber Costa [this message]
2013-01-22 14:00 ` [PATCH v4 6/6] memcg: avoid dangling reference count in creation failure Michal Hocko
2013-01-29 0:22 ` Kamezawa Hiroyuki
2013-01-25 10:05 ` [PATCH v4 0/6] replace cgroup_lock with memcg specific locking Lord Glauber Costa of Sealand
2013-01-25 10:18 ` Michal Hocko
2013-01-25 10:27 ` Lord Glauber Costa of Sealand
2013-01-25 17:37 ` Tejun Heo
2013-01-26 0:03 ` Andrew Morton
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