linux-kernel - Re: [PATCH 2/9] oom: oom_kill_process() doesn't select kthread child

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Message-ID: <alpine.DEB.2.00.1006211313080.8367@chino.kir.corp.google.com>
Date:	Mon, 21 Jun 2010 13:14:13 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH 2/9] oom: oom_kill_process() doesn't select kthread
 child

On Thu, 17 Jun 2010, KOSAKI Motohiro wrote:

> 
> Now, select_bad_process() have PF_KTHREAD check, but oom_kill_process
> doesn't. It mean oom_kill_process() may choose wrong task, especially,
> when the child are using use_mm().
> 

This type of check should be moved to badness(), it will prevent these 
types of tasks from being selected both in select_bad_process() and 
oom_kill_process() if the score it returns is 0.
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