From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with SMTP id 151766B004F for ; Wed, 1 Jul 2009 00:25:13 -0400 (EDT) Received: by pxi33 with SMTP id 33so523509pxi.12 for ; Tue, 30 Jun 2009 21:25:59 -0700 (PDT) Date: Wed, 1 Jul 2009 12:25:54 +0800 From: Wu Fengguang 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> Sender: owner-linux-mm@kvack.org 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" List-ID: 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, 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