linux-kernel - Re: [PATCH 2/4] remove boost_dying_task

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Message-ID: <alpine.DEB.2.00.1104131141040.5563@chino.kir.corp.google.com>
Date:	Wed, 13 Apr 2011 11:41:18 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	Andrey Vagin <avagin@...nvz.org>,
	Minchan Kim <minchan.kim@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"Luis Claudio R. Goncalves" <lclaudio@...g.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 2/4] remove boost_dying_task_prio()

On Mon, 11 Apr 2011, KOSAKI Motohiro wrote:

> This is a almost revert commit 93b43fa (oom: give the dying
> task a higher priority).
> 
> The commit dramatically improve oom killer logic when fork-bomb
> occur. But, I've found it has nasty corner case. Now cpu cgroup
> has strange default RT runtime. It's 0! That said, if a process
> under cpu cgroup promote RT scheduling class, the process never
> run at all.
> 
> Eventually, kernel may hang up when oom kill occur.
> I and Luis who original author agreed to disable this logic at
> once.
> 
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Acked-by: Luis Claudio R. Goncalves <lclaudio@...g.org>
> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Reviewed-by: Minchan Kim <minchan.kim@...il.com>

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