linux-kernel - Re: [PATCH 0/3] Reduce GFP_ATOMIC allocation failures, partial fix V3

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Date:	Wed, 28 Oct 2009 14:02:23 +0100
From:	Karol Lewandowski <karol.k.lewandowski@...il.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, stable@...nel.org,
	linux-kernel@...r.kernel.org,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Frans Pop <elendil@...net.nl>, Jiri Kosina <jkosina@...e.cz>,
	Sven Geggus <lists@...hsschwanzdomain.de>,
	Karol Lewandowski <karol.k.lewandowski@...il.com>,
	Tobias Oetiker <tobi@...iker.ch>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Rik van Riel <riel@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Stephan von Krawczynski <skraw@...net.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Kernel Testers List <kernel-testers@...r.kernel.org>
Subject: Re: [PATCH 0/3] Reduce GFP_ATOMIC allocation failures, partial fix
	V3

On Tue, Oct 27, 2009 at 01:40:30PM +0000, Mel Gorman wrote:
> The following bug becomes very difficult to reproduce with these patches;
> 
> [Bug #14265] ifconfig: page allocation failure. order:5, mode:0x8020 w/ e100

Minor clarification -- bug becomes difficult to reproduce _quickly_.

I've always saw this bug after many suspend-resume cycles (interlaved
with "real work").  Since testing one kernel in normal usage scenario
would take many days I've tried to immitate "real work" by lots of
memory intensive/fragmenting processes.

Hovewer, this bug shows itself (sooner or later) in every kernel
except 2.6.30 (or earlier).

Thanks.
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