Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753802Ab2K0LMc (ORCPT ); Tue, 27 Nov 2012 06:12:32 -0500 Received: from cantor2.suse.de ([195.135.220.15]:40379 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753364Ab2K0LMa (ORCPT ); Tue, 27 Nov 2012 06:12:30 -0500 Date: Tue, 27 Nov 2012 11:12:25 +0000 From: Mel Gorman To: Thorsten Leemhuis Cc: Josh Boyer , Zdenek Kabelac , Seth Jennings , Jiri Slaby , Valdis.Kletnieks@vt.edu, Jiri Slaby , linux-mm@kvack.org, LKML , Andrew Morton , Rik van Riel , Robert Jennings , bruno@wolff.to Subject: Re: [PATCH] Revert "mm: remove __GFP_NO_KSWAPD" Message-ID: <20121127111225.GO8218@suse.de> References: <509C84ED.8090605@linux.vnet.ibm.com> <509CB9D1.6060704@redhat.com> <20121109090635.GG8218@suse.de> <509F6C2A.9060502@redhat.com> <20121112113731.GS8218@suse.de> <20121116200616.GK8218@suse.de> <50ABC128.80706@leemhuis.info> <50AF9450.9020803@leemhuis.info> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <50AF9450.9020803@leemhuis.info> 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: 2496 Lines: 59 On Fri, Nov 23, 2012 at 04:20:48PM +0100, Thorsten Leemhuis wrote: > Thorsten Leemhuis wrote on 20.11.2012 18:43: > > On 20.11.2012 16:38, Josh Boyer wrote: > > > > The short story from my current point of view is: > > Quick update, in case anybody is interested: > > > * my main machine at home where I initially saw the issue that started > > this thread seems to be running fine with rc6 and the "safe" patch Mel > > posted in https://lkml.org/lkml/2012/11/12/113 Before that I ran a rc5 > > kernel with the revert that went into rc6 and the "safe" patch -- that > > worked fine for a few days, too. > > On this machine I'm running a rc6 kernel + the fix for the accounting > bug(?) that went into mainline ~40 hours ago + the "riskier" patch Mel > posted in https://lkml.org/lkml/2012/11/12/151 > > Up to now everything works fine. > > (?) https://lkml.org/lkml/2012/11/21/362 > That's good news, thanks for the follow up. Maybe 3.7 will not be a complete disaster with respect to THP after all this. The riskier patch was not picked up simply because it was riskier and would still be vunerable to the effective infinite loop Johannes found in kswapd. It'll all need to be revisisted. > > * I have a second machine where I started to use 3.7-rc kernels only > > yesterday (the machine triggered a bug in the radeon driver that seems > > to be fixed in rc6) which showed symptoms like the ones Zdenek Kabelac > > mentions in this thread. I wasn't able to look closer at it, but simply > > tried rc6 with the safe patch, which didn't help. I'm now running rc6 > > with the "riskier" patch from https://lkml.org/lkml/2012/11/12/151 > > I can't yet tell if it helps. If the problems shows up again I'll try to > > capture more debugging data via sysrq -- there wasn't any time for that > > when I was running rc6 with the safe patch, sorry. > > This machine is now also behaving fine with above mentioned rc6 kernel + > the two patches. It seems the accounting bug was the root cause for the > problems this machine showed. > For some yes, for others no. Others are getting stuck within effective infinite loops in kswapd and the trigger cases are different although the symptoms loop similar. Thanks again. -- 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/