linux-kernel - Re: [patch -mmotm] oom: only oom kill exiting tasks with attached memory

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Message-Id: <20090608095659.4360.A69D9226@jp.fujitsu.com>
Date:	Mon,  8 Jun 2009 10:08:34 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [patch -mmotm] oom: only oom kill exiting tasks with attached memory

> When a task is chosen for oom kill and is found to be PF_EXITING,
> __oom_kill_task() is called to elevate the task's timeslice and give it
> access to memory reserves so that it may quickly exit.
> 
> This privilege is unnecessary, however, if the task has already detached
> its mm.  Although its possible for the mm to become detached later since
> task_lock() is not held, __oom_kill_task() will simply be a no-op in such
> circumstances.
> 
> Subsequently, it is no longer necessary to warn about killing mm-less
> tasks since it is a no-op.
> 
> Cc: Rik van Riel <riel@...hat.com>
> Signed-off-by: David Rientjes <rientjes@...gle.com>

it seems reasonable.
thanks.

	Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>



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