From: Kamezawa Hiroyuki <kamezawa.hiroyu-+CUm20s59erQFUHtdCDX3A@public.gmane.org>
To: Li Zefan <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
Cc: Glauber Costa <glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>,
Michal Hocko <mhocko-AlSwsSmVLrQ@public.gmane.org>,
Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>,
LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Cgroups <cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
Subject: Re: [PATCH] memcg: take reference before releasing rcu_read_lock
Date: Mon, 01 Apr 2013 14:03:26 +0900 [thread overview]
Message-ID: <5159151E.9070204@jp.fujitsu.com> (raw)
In-Reply-To: <51556CE9.9060000-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
(2013/03/29 19:28), Li Zefan wrote:
> The memcg is not referenced, so it can be destroyed at anytime right
> after we exit rcu read section, so it's not safe to access it.
>
> To fix this, we call css_tryget() to get a reference while we're still
> in rcu read section.
>
> This also removes a bogus comment above __memcg_create_cache_enqueue().
>
> Signed-off-by: Li Zefan <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu-+CUm20s59erQFUHtdCDX3A@public.gmane.org>
prev parent reply other threads:[~2013-04-01 5:03 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-29 10:28 [PATCH] memcg: take reference before releasing rcu_read_lock Li Zefan
[not found] ` <51556CE9.9060000-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2013-03-29 10:48 ` Glauber Costa
[not found] ` <5155718A.90108-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2013-03-30 0:35 ` Li Zefan
2013-04-01 7:24 ` Glauber Costa
2013-03-29 14:59 ` Michal Hocko
2013-04-01 5:03 ` Kamezawa Hiroyuki [this message]
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