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Date: Mon, 19 Oct 2009 16:01:45 +0200
From: Karol Lewandowski <karol.k.lewandowski@gmail.com>
To: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Tobi Oetiker <tobi@oetiker.ch>, Frans Pop <elendil@planet.nl>,
       Mel Gorman <mel@csn.ul.ie>, David Rientjes <rientjes@google.com>,
       KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
       "Rafael J. Wysocki" <rjw@sisk.pl>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Kernel Testers List <kernel-testers@vger.kernel.org>,
       Reinette Chatre <reinette.chatre@intel.com>,
       Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>,
       Karol Lewandowski <karol.k.lewandowski@gmail.com>,
       Mohamed Abbas <mohamed.abbas@intel.com>,
       "John W. Linville" <linville@tuxdriver.com>, linux-mm@kvack.org,
       jens.axboe@oracle.com
Subject: Re: [Bug #14141] order 2 page allocation failures (generic)
Message-ID: <20091019140145.GA4222@bizet.domek.prywatny>
References: <3onW63eFtRF.A.xXH.oMTxKB@chimera> <200910190133.33183.elendil@planet.nl> <1255912562.6824.9.camel@penberg-laptop> <200910190444.55867.elendil@planet.nl> <alpine.DEB.2.00.0910191146110.1306@sebohet.brgvxre.pu> <1255946051.5941.2.camel@penberg-laptop>
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On Mon, Oct 19, 2009 at 12:54:11PM +0300, Pekka Enberg wrote:
> On Mon, 2009-10-19 at 11:49 +0200, Tobi Oetiker wrote:
> > I have updated a fileserver to 2.6.31 today and I see page
> > allocation failures from several parts of the system ... mostly nfs though ... (it is a nfs server).
> > So I guess the problem must be quite generic:
> 
> Yup, it almost certainly is. Does this patch help?
> 
> http://lkml.org/lkml/2009/10/16/89

This patch seems to help in some cases.  Before applying this patch I
was able to trigger alloc failures on different machine by booting
kernel with "mem=256MB" and doing:

  $ gitk on-full-tree &
  # rmmod e100
  ... wait for few MBs in swap
  # modprobe e100; ifup --force ethX

So here this patch helped -- with it, I was unable to trigger page
allocation failures (testing was short, tough).  However, as I said
here[1], I applied both of Mel's patches (including this one) and that
didn't help my orginal issue (failures after suspend).

[1] http://lkml.org/lkml/2009/10/17/109

Thanks.
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