linux-kernel - Re: [PATCH 02/11] oom: oom_kill_process() doesn't select kthread child

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Message-Id: <20100701085011.DA13.A69D9226@jp.fujitsu.com>
Date:	Thu,  1 Jul 2010 09:07:02 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH 02/11] oom: oom_kill_process() doesn't select kthread child

> On Wed, Jun 30, 2010 at 06:27:52PM +0900, 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().
> 
> Is it possible child is kthread even though parent isn't kthread?

Usually unhappen. but crappy driver can do any strange thing freely.
As I said, oom code should have conservative assumption as far as possible.



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