linux-kernel - Re: [Bug #14141] order 2 page allocation failures (generic)

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Date:	Thu, 22 Oct 2009 12:27:32 +0200 (CEST)
From:	Tobias Oetiker <tobi@...iker.ch>
To:	Mel Gorman <mel@....ul.ie>
cc:	Frans Pop <elendil@...net.nl>,
	Pekka Enberg <penberg@...helsinki.fi>,
	David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Karol Lewandowski <karol.k.lewandowski@...il.com>,
	Mohamed Abbas <mohamed.abbas@...el.com>,
	"John W. Linville" <linville@...driver.com>, linux-mm@...ck.org,
	jens.axboe@...cle.com
Subject: Re: [Bug #14141] order 2 page allocation failures (generic)

Hi Mel,

Tuesday Mel Gorman wrote:
> 4. Does the following patch help by any chance?
>
> Thanks
>
> ==== CUT HERE ====
> vmscan: Force kswapd to take notice faster when high-order watermarks are being hit
>
> When a high-order allocation fails, kswapd is kicked so that it reclaims
> at a higher-order to avoid direct reclaimers stall and to help GFP_ATOMIC
> allocations. Something has changed in recent kernels that affect the timing
> where high-order GFP_ATOMIC allocations are now failing with more frequency,
> particularly under pressure. This patch forces kswapd to notice sooner that
> high-order allocations are occuring by checking when watermarks are hit early
> and by having kswapd restart quickly when the reclaim order is increased.
>
> Not-signed-off-by-because-this-is-a-hatchet-job: Mel Gorman <mel@....ul.ie>
> ---

it does seem to help ... I have been running it from 6am to 12am on
our server now and have not yet seen any issues ...

will shout if I do ...

cheers
tobi

-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi@...iker.ch ++41 62 775 9902 / sb: -9900
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