Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757805Ab2F1A6j (ORCPT ); Wed, 27 Jun 2012 20:58:39 -0400 Received: from LGEMRELSE1Q.lge.com ([156.147.1.111]:58154 "EHLO LGEMRELSE1Q.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753821Ab2F1A6h (ORCPT ); Wed, 27 Jun 2012 20:58:37 -0400 X-AuditID: 9c93016f-b7cc1ae00000555f-96-4febac35ce5c Message-ID: <4FEBAC42.3030800@kernel.org> Date: Thu, 28 Jun 2012 09:58:42 +0900 From: Minchan Kim User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1 MIME-Version: 1.0 Newsgroups: gmane.linux.kernel.mm,gmane.linux.kernel,gmane.comp.file-systems.ceph.devel To: David Rientjes CC: Rik van Riel , Jim Schutt , Andrew Morton , Mel Gorman , KAMEZAWA Hiroyuki , linux-mm@kvack.org, linux-kernel@vger.kernel.org, "ceph-devel@vger.kernel.org" Subject: Re: excessive CPU utilization by isolate_freepages? References: <4FEB8237.6030402@sandia.gov> <4FEB9E73.5040709@kernel.org> <4FEBA520.4030205@redhat.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Brightmail-Tracker: AAAAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 785 Lines: 26 On 06/28/2012 09:52 AM, David Rientjes wrote: > On Wed, 27 Jun 2012, Rik van Riel wrote: > >>> > > I doubt compaction try to migrate continuously although we have no free >>> > > memory. >>> > > Could you apply this patch and retest? >>> > > >>> > > https://lkml.org/lkml/2012/6/21/30 >> > > Not sure if Jim is using memcg; if not, then this won't be helpful. > It doesn't related to memcg. if compaction_alloc can't find suitable migration target, it returns NULL. Then, migrate_pages should be exit. -- Kind regards, Minchan Kim -- 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/