linux-kernel - Re: [PATCH 0/5] Candidate fix for increased number of GFP

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Message-ID: <20091104020301.GA7037@bizet.domek.prywatny>
Date:	Wed, 4 Nov 2009 03:03:01 +0100
From:	Karol Lewandowski <karol.k.lewandowski@...il.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Karol Lewandowski <karol.k.lewandowski@...il.com>,
	Frans Pop <elendil@...net.nl>, Jiri Kosina <jkosina@...e.cz>,
	Sven Geggus <lists@...hsschwanzdomain.de>,
	Tobias Oetiker <tobi@...iker.ch>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	David Miller <davem@...emloft.net>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Kalle Valo <kalle.valo@....fi>,
	David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mohamed Abbas <mohamed.abbas@...el.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	"John W. Linville" <linville@...driver.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Stephan von Krawczynski <skraw@...net.com>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 0/5] Candidate fix for increased number of GFP_ATOMIC
	failures V2

On Mon, Nov 02, 2009 at 08:30:34PM +0000, Mel Gorman wrote:
> Does applying the following on top make any difference?
> 
> ==== CUT HERE ====
> PM: Shrink memory before suspend

No, this patch didn't change anything either.

IIRC I get failures while free(1) shows as much as 20MB free RAM
(ie. without buffers/caches).  Additionaly nr_free_pages (from
/proc/vmstat) stays at about 800-1000 under heavy memory pressure
(gitk on full linux repository).


--- babbling follows ---

Hmm, I wonder if it's really timing issue then wouldn't be the case
that lowering swappiness sysctl would make problem more visible?
I've vm.swappiness=15, would testing with higher value make any sense?

Thanks.
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