Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752260Ab2KLNNg (ORCPT ); Mon, 12 Nov 2012 08:13:36 -0500 Received: from mx1.redhat.com ([209.132.183.28]:65306 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751283Ab2KLNNf (ORCPT ); Mon, 12 Nov 2012 08:13:35 -0500 Message-ID: <50A0F5F0.6090400@redhat.com> Date: Mon, 12 Nov 2012 14:13:20 +0100 From: Zdenek Kabelac Organization: Red Hat User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:16.0) Gecko/20121016 Thunderbird/16.0.1 MIME-Version: 1.0 To: Mel Gorman 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 References: <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> <20121109090635.GG8218@suse.de> <509F6C2A.9060502@redhat.com> <20121112121956.GT8218@suse.de> In-Reply-To: <20121112121956.GT8218@suse.de> Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1428 Lines: 36 Dne 12.11.2012 13:19, Mel Gorman napsal(a): > On Sun, Nov 11, 2012 at 10:13:14AM +0100, Zdenek Kabelac wrote: >> Hmm, so it's just took longer to hit the problem and observe kswapd0 >> spinning on my CPU again - it's not as endless like before - but >> still it easily eats minutes - it helps to turn off Firefox or TB >> (memory hungry apps) so kswapd0 stops soon - and restart those apps >> again. >> (And I still have like >1GB of cached memory) >> > > I posted a "safe" patch that I believe explains why you are seeing what > you are seeing. It does mean that there will still be some stalls due to > THP because kswapd is not helping and it's avoiding the problem rather > than trying to deal with it. > > Hence, I'm also going to post this patch even though I have not tested > it myself. If you find it fixes the problem then it would be a > preferable patch to the revert. It still is the case that the > balance_pgdat() logic is in sort need of a rethink as it's pretty > twisted right now. > Should I apply them all together for 3.7-rc5 ? 1) https://lkml.org/lkml/2012/11/5/308 2) https://lkml.org/lkml/2012/11/12/113 3) https://lkml.org/lkml/2012/11/12/151 Zdenek -- 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/