linux-kernel - Re: Found the commit that causes the OOMs

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Message-ID: <4A4AD07E.2040508@redhat.com>
Date:	Tue, 30 Jun 2009 22:57:02 -0400
From:	Rik van Riel <riel@...hat.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC:	Wu Fengguang <fengguang.wu@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	David Howells <dhowells@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Mel Gorman <mel@....ul.ie>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"tytso@....edu" <tytso@....edu>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"elladan@...imo.com" <elladan@...imo.com>,
	"npiggin@...e.de" <npiggin@...e.de>,
	"Barnes, Jesse" <jesse.barnes@...el.com>
Subject: Re: Found the commit that causes the OOMs

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.

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