From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx204.postini.com [74.125.245.204]) by kanga.kvack.org (Postfix) with SMTP id D772B6B0044 for ; Tue, 4 Dec 2012 16:43:13 -0500 (EST) Date: Tue, 4 Dec 2012 16:42:10 -0500 From: Johannes Weiner Subject: Re: kswapd craziness in 3.7 Message-ID: <20121204214210.GB20253@cmpxchg.org> References: <20121128101359.GT8218@suse.de> <20121128145215.d23aeb1b.akpm@linux-foundation.org> <20121128235412.GW8218@suse.de> <50B77F84.1030907@leemhuis.info> <20121129170512.GI2301@cmpxchg.org> <50B8A8E7.4030108@leemhuis.info> <20121201004520.GK2301@cmpxchg.org> <50BC6314.7060106@leemhuis.info> <20121203194208.GZ24381@cmpxchg.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20121203194208.GZ24381@cmpxchg.org> Sender: owner-linux-mm@kvack.org List-ID: To: Thorsten Leemhuis Cc: Mel Gorman , Andrew Morton , Linus Torvalds , Rik van Riel , George Spelvin , Johannes Hirte , Tomas Racek , Jan Kara , Dave Hansen , Josh Boyer , Valdis Kletnieks , Jiri Slaby , Zdenek Kabelac , Bruno Wolff III , linux-mm , Linux Kernel Mailing List , John Ellson On Mon, Dec 03, 2012 at 02:42:08PM -0500, Johannes Weiner wrote: > On Mon, Dec 03, 2012 at 09:30:12AM +0100, Thorsten Leemhuis wrote: > > >> John was able to reproduce the problem quickly with a kernel that > > >> contained the patch from your mail. For details see > > > > > > [stripped: all the glory details of what likely went wrong and lead > > > to the problem john sees or saw] > > > > > > --- > > > From: Johannes Weiner > > > Subject: [patch] mm: vmscan: do not keep kswapd looping forever due > > > to individual uncompactable zones > > > > > > When a zone meets its high watermark and is compactable in case of > > > higher order allocations, it contributes to the percentage of the > > > node's memory that is considered balanced. > > > [...] > > > > FYI: I built a kernel with that patch. I've been running on my x86_64 > > machine at home over the weekend and everything was working fine (just > > as without the patch). John gave it a quick try and in > > https://bugzilla.redhat.com/show_bug.cgi?id=866988#c57 reported: > > > > """ > > I just installed > > kernel-3.7.0-0.rc7.git1.2.van.main.knurd.kswap.4.fc18.i686 and ran my > > usual load that triggers the problem. OK so far. I'll check again in > > 24hours, but looking good so far. > > """ > > w00t! Update from John in the BZ (https://bugzilla.redhat.com/show_bug.cgi?id=866988#c62): "Good news. I've now been running both kernel-3.7.0-0.rc7.git1.2.van.main.knurd.kswap.4.fc18.i686 and kernel-3.7.0-0.rc7.git1.2.van.main.knurd.kswap.4.fc18.x86_64 for over 24hours with no evidence of problems with kswapd" Now waiting for results from Jiri, Zdenek and Bruno... -- 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/ . Don't email: email@kvack.org