Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753377AbZGAE0I (ORCPT ); Wed, 1 Jul 2009 00:26:08 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751557AbZGAEZ5 (ORCPT ); Wed, 1 Jul 2009 00:25:57 -0400 Received: from rv-out-0506.google.com ([209.85.198.229]:8316 "EHLO rv-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750715AbZGAEZ4 (ORCPT ); Wed, 1 Jul 2009 00:25:56 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; b=IvOFaGiOdzjftU9/lPb4mDvg4YMhtAEtoOh0L242C4RGM3l/SwMTsM7H6spg2jSHRd QwQ4jnuLwsN6R4HAisZbxKTcykAg4EI4BPUwVcdhcrMevaWmGXvfkcj4eVvPCnPaFX8m u582HH1+pQyFt45GI6KtMB5JAZApqPSI9ekUg= Date: Wed, 1 Jul 2009 12:25:54 +0800 From: Wu Fengguang To: KOSAKI Motohiro Cc: Rik van Riel , David Woodhouse , David Howells , Minchan Kim , Mel Gorman , Johannes Weiner , Andrew Morton , LKML , Christoph Lameter , "peterz@infradead.org" , "tytso@mit.edu" , "linux-mm@kvack.org" , "elladan@eskimo.com" , "npiggin@suse.de" , "Barnes, Jesse" Subject: Re: Found the commit that causes the OOMs Message-ID: <20090701042554.GA14344@localhost> References: <4A4AD07E.2040508@redhat.com> <20090701040649.GA12832@localhost> <20090701131734.85D9.A69D9226@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090701131734.85D9.A69D9226@jp.fujitsu.com> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1468 Lines: 39 On Wed, Jul 01, 2009 at 01:18:39PM +0900, KOSAKI Motohiro wrote: > > On Tue, Jun 30, 2009 at 10:57:02PM -0400, Rik van Riel wrote: > > > KOSAKI Motohiro wrote: > > > > > >>> [ 1522.019259] Active_anon:11 active_file:6 inactive_anon:0 > > >>> [ 1522.019260] inactive_file:0 unevictable:0 dirty:0 writeback:0 unstable:0 > > >>> [ 1522.019261] free:1985 slab:44399 mapped:132 pagetables:61830 bounce:0 > > >>> [ 1522.019262] isolate:69817 > > >> > > >> OK. thanks. > > >> I plan to submit this patch after small more tests. it is useful for OOM analysis. > > > > > > It is also useful for throttling page reclaim. > > > > > > If more than half of the inactive pages in a zone are > > > isolated, we are probably beyond the point where adding > > > additional reclaim processes will do more harm than good. > > > > There are probably more problems in this case. For example, > > followed is the vmstat after first (successful) run of msgctl11. > > > > The question is: Why kswapd reclaims are absent here? > > if direct reclaim isolate all pages, kswapd can't reclaim any pages. OOM will occur in that condition. What happened before that time? > I believe Rik's idea solve this problem. Me too :) Thanks, Fengguang -- 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/