linux-kernel - Re: [PATCH v2 2/4] oom_kill: change oom_kill.c to use for_each

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Message-ID: <alpine.DEB.2.02.1312041638520.31158@chino.kir.corp.google.com>
Date:	Wed, 4 Dec 2013 16:39:06 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Oleg Nesterov <oleg@...hat.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mandeep Singh Baines <msb@...omium.org>,
	"Ma, Xindong" <xindong.ma@...el.com>,
	Michal Hocko <mhocko@...e.cz>,
	Sameer Nanda <snanda@...omium.org>,
	Sergey Dyasly <dserrg@...il.com>,
	"Tu, Xiaobing" <xiaobing.tu@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] oom_kill: change oom_kill.c to use
 for_each_thread()

On Wed, 4 Dec 2013, Oleg Nesterov wrote:

> Change oom_kill.c to use for_each_thread() rather than the racy
> while_each_thread() which can loop forever if we race with exit.
> 
> Note also that most users were buggy even if while_each_thread()
> was fine, the task can exit even _before_ rcu_read_lock().
> 
> Fortunately the new for_each_thread() only requires the stable
> task_struct, so this change fixes both problems.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>
> Reviewed-and-Tested-by: Sergey Dyasly <dserrg@...il.com>
> Reviewed-by: Sameer Nanda <snanda@...omium.org>

Acked-by: David Rientjes <rientjes@...gle.com>
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