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

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Message-ID: <20110323134037.GP5212@uudg.org>
Date:	Wed, 23 Mar 2011 10:40:37 -0300
From:	"Luis Claudio R. Goncalves" <lclaudio@...g.org>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...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>

-- 
[ Luis Claudio R. Goncalves                    Bass - Gospel - RT ]
[ Fingerprint: 4FDD B8C4 3C59 34BD 8BE9  2696 7203 D980 A448 C8F8 ]

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