linux-kernel - Re: [PATCH 2/5] Revert "oom: give the dying task a higher priority"

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Message-Id: <20110324090635.1AEC.A69D9226@jp.fujitsu.com>
Date:	Thu, 24 Mar 2011 09:06:44 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	"Luis Claudio R. Goncalves" <lclaudio@...g.org>
Cc:	kosaki.motohiro@...fujitsu.com,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>, linux-mm <linux-mm@...ck.org>,
	Andrey Vagin <avagin@...nvz.org>,
	Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH 2/5] Revert "oom: give the dying task a higher priority"

> On Wed, Mar 23, 2011 at 04:42:29PM +0900, KAMEZAWA Hiroyuki wrote:
> | On Tue, 22 Mar 2011 20:06:48 +0900 (JST)
> | KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:
> | 
> | > This reverts commit 93b43fa55088fe977503a156d1097cc2055449a2.
> | > 
> | > 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.
> | > 
> | > The author need to resubmit it as adding knob and disabled
> | > by default if he really need this feature.
> | > 
> | > Cc: Luis Claudio R. Goncalves <lclaudio@...g.org>
> | > Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> | 
> | Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> The original patch was written to fix an issue observed in 2.6.24.7-rt.
> As the logic sounded useful, I ported it to upstream. Anyway,I am trying
> a few ideas to rework that patch. In the meantime, I'm pretty fine with
> reverting the commit.
> 
> Acked-by: Luis Claudio R. Gonçalves <lgoncalv@...g.org>

Ok, and then, I'll drop [patch 3/5] too. I hope to focus to discuss your idea.




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