From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with ESMTP id A8F228D0040 for ; Wed, 23 Mar 2011 20:07:08 -0400 (EDT) Received: from m1.gw.fujitsu.co.jp (unknown [10.0.50.71]) by fgwmail5.fujitsu.co.jp (Postfix) with ESMTP id C794A3EE0C0 for ; Thu, 24 Mar 2011 09:07:05 +0900 (JST) Received: from smail (m1 [127.0.0.1]) by outgoing.m1.gw.fujitsu.co.jp (Postfix) with ESMTP id A60FF45DE5F for ; Thu, 24 Mar 2011 09:07:05 +0900 (JST) Received: from s1.gw.fujitsu.co.jp (s1.gw.fujitsu.co.jp [10.0.50.91]) by m1.gw.fujitsu.co.jp (Postfix) with ESMTP id 8C25645DE5A for ; Thu, 24 Mar 2011 09:07:05 +0900 (JST) Received: from s1.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s1.gw.fujitsu.co.jp (Postfix) with ESMTP id 71271E08002 for ; Thu, 24 Mar 2011 09:07:05 +0900 (JST) Received: from ml13.s.css.fujitsu.com (ml13.s.css.fujitsu.com [10.240.81.133]) by s1.gw.fujitsu.co.jp (Postfix) with ESMTP id 33D9E1DB8044 for ; Thu, 24 Mar 2011 09:07:05 +0900 (JST) From: KOSAKI Motohiro Subject: Re: [PATCH 2/5] Revert "oom: give the dying task a higher priority" In-Reply-To: <20110323134037.GP5212@uudg.org> References: <20110323164229.6b647004.kamezawa.hiroyu@jp.fujitsu.com> <20110323134037.GP5212@uudg.org> Message-Id: <20110324090635.1AEC.A69D9226@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable Date: Thu, 24 Mar 2011 09:06:44 +0900 (JST) Sender: owner-linux-mm@kvack.org List-ID: To: "Luis Claudio R. Goncalves" Cc: kosaki.motohiro@jp.fujitsu.com, KAMEZAWA Hiroyuki , linux-kernel@vger.kernel.org, Andrew Morton , David Rientjes , Linus Torvalds , Rik van Riel , Oleg Nesterov , linux-mm , Andrey Vagin , Hugh Dickins > 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 wrote: > |=20 > | > This reverts commit 93b43fa55088fe977503a156d1097cc2055449a2. > | >=20 > | > 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. > | >=20 > | > Eventually, kernel may hang up when oom kill occur. > | >=20 > | > The author need to resubmit it as adding knob and disabled > | > by default if he really need this feature. > | >=20 > | > Cc: Luis Claudio R. Goncalves > | > Signed-off-by: KOSAKI Motohiro > |=20 > | Acked-by: KAMEZAWA Hiroyuki >=20 > 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. >=20 > Acked-by: Luis Claudio R. Gon=E7alves Ok, and then, I'll drop [patch 3/5] too. I hope to focus to discuss your id= ea. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org