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

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Message-Id: <20090701132757.85DC.A69D9226@jp.fujitsu.com>
Date:	Wed,  1 Jul 2009 13:30:51 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Wu Fengguang <fengguang.wu@...il.com>
Cc:	kosaki.motohiro@...fujitsu.com, Rik van Riel <riel@...hat.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

> > > 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?

maybe yes, maybe no.
At first test, the system still have droppable file cache. if direct reclaim luckly take it,
the benchmark become successful end, I think.

Thanks.

> 
> > I believe Rik's idea solve this problem.
> 
> Me too :)
> 
> Thanks,
> Fengguang
> 



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