From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx115.postini.com [74.125.245.115]) by kanga.kvack.org (Postfix) with SMTP id 989266B004D for ; Sun, 4 Nov 2012 06:26:40 -0500 (EST) Message-ID: <509650EA.5060508@redhat.com> Date: Sun, 04 Nov 2012 12:26:34 +0100 From: Zdenek Kabelac MIME-Version: 1.0 Subject: Re: kswapd0: excessive CPU usage References: <507688CC.9000104@suse.cz> <106695.1349963080@turing-police.cc.vt.edu> <5076E700.2030909@suse.cz> <118079.1349978211@turing-police.cc.vt.edu> <50770905.5070904@suse.cz> <119175.1349979570@turing-police.cc.vt.edu> <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> In-Reply-To: <509422C3.1000803@suse.cz> Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Jiri Slaby Cc: Mel Gorman , Valdis.Kletnieks@vt.edu, Jiri Slaby , linux-mm@kvack.org, LKML , Andrew Morton Dne 2.11.2012 20:45, Jiri Slaby napsal(a): > On 11/02/2012 11:53 AM, Jiri Slaby wrote: >> On 11/02/2012 11:44 AM, Zdenek Kabelac wrote: >>>>> Yes, applying this instead of the revert fixes the issue as well. >>> >>> I've applied this patch on 3.7.0-rc3 kernel - and I still see excessive >>> CPU usage - mainly after suspend/resume >>> >>> Here is just simple kswapd backtrace from running kernel: >> >> Yup, this is what we were seeing with the former patch only too. Try to >> apply the other one too: >> https://patchwork.kernel.org/patch/1673231/ >> >> For me I would say, it is fixed by the two patches now. I won't be able >> to report later, since I'm leaving to a conference tomorrow. > > Damn it. It recurred right now, with both patches applied. After I > started a java program which consumed some more memory. Though there are > still 2 gigs free, kswap is spinning: > [] __cond_resched+0x2a/0x40 > [] shrink_slab+0x1c0/0x2d0 > [] kswapd+0x66d/0xb60 > [] kthread+0xc0/0xd0 > [] ret_from_fork+0x7c/0xb0 > [] 0xffffffffffffffff > Yep - wanted to report myself again and noticed your replay. Yes - I've now also both patches installed - and I still observe kswapd eating my CPU. It seems (at least for me) that prior suspend and resume is way to trigger it more frequently. However there is a change in behaviour - while before kswapd was running almost indefinitely now the> CPU spikes are in the range of minutes. (i.e. uptime ~2days - kswapd has over 32minutes CPU time) My machine has 4GB, and no swap (disabled) firefox (22mins), thunderbird(3mins) and pidgin(0.5min) are the 3 most memory and CPU hungry apps for this moment. Zdenek -- 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