Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751869Ab2KIJGn (ORCPT ); Fri, 9 Nov 2012 04:06:43 -0500 Received: from cantor2.suse.de ([195.135.220.15]:34351 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751228Ab2KIJGj (ORCPT ); Fri, 9 Nov 2012 04:06:39 -0500 Date: Fri, 9 Nov 2012 09:06:35 +0000 From: Mel Gorman To: Zdenek Kabelac Cc: Seth Jennings , Jiri Slaby , Valdis.Kletnieks@vt.edu, Jiri Slaby , linux-mm@kvack.org, LKML , Andrew Morton , Rik van Riel , Robert Jennings Subject: Re: kswapd0: excessive CPU usage Message-ID: <20121109090635.GG8218@suse.de> References: <5077434D.7080008@suse.cz> <50780F26.7070007@suse.cz> <20121012135726.GY29125@suse.de> <507BDD45.1070705@suse.cz> <20121015110937.GE29125@suse.de> <5093A3F4.8090108@redhat.com> <5093A631.5020209@suse.cz> <509422C3.1000803@suse.cz> <509C84ED.8090605@linux.vnet.ibm.com> <509CB9D1.6060704@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: <509CB9D1.6060704@redhat.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1146 Lines: 37 On Fri, Nov 09, 2012 at 09:07:45AM +0100, Zdenek Kabelac wrote: > >fe2c2a106663130a5ab45cb0e3414b52df2fff0c is the first bad commit > >commit fe2c2a106663130a5ab45cb0e3414b52df2fff0c > >Author: Rik van Riel > >Date: Wed Mar 21 16:33:51 2012 -0700 > > > > vmscan: reclaim at order 0 when compaction is enabled > >... > > > >This is plausible since the issue seems to be in the kswapd + compaction > >realm. I've yet to figure out exactly what about this commit results in > >kswapd spinning. > > > >I would be interested if someone can confirm this finding. > > > >-- > >Seth > > > > > On my system 3.7-rc4 the problem seems to be effectively solved by > revert patch: https://lkml.org/lkml/2012/11/5/308 > Ok, while there is still a question on whether it's enough I think it's sensible to at least start with the obvious one. Thanks very much. -- Mel Gorman SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/