linux-kernel - Re: [Bug #14141] order 2 page allocation failures in iwlagn

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Message-ID: <20091019170115.GA4593@infradead.org>
Date:	Mon, 19 Oct 2009 13:01:15 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Chris Mason <chris.mason@...cle.com>, Mel Gorman <mel@....ul.ie>,
	Frans Pop <elendil@...net.nl>,
	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>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Karol Lewandowski <karol.k.lewandowski@...il.com>,
	Mohamed Abbas <mohamed.abbas@...el.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	"John W. Linville" <linville@...driver.com>, linux-mm@...ck.org
Subject: Re: [Bug #14141] order 2 page allocation failures in iwlagn

On Tue, Oct 20, 2009 at 01:18:15AM +0900, Chris Mason wrote:
> Waiting doesn't make it synchronous from the elevator point of view ;)
> If you're using WB_SYNC_NONE, it's a async write.  WB_SYNC_ALL makes it
> a sync write.  I only see WB_SYNC_NONE in vmscan.c, so we should be
> using the async congestion wait.  (the exception is xfs which always
> does async writes).

That's only because those people who did the global sweep did not bother
to convert it or even tell the list about it.  I have a patch in my
QA queue to change it..

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