Message-ID: <4A549C9B.4060702@lwfinger.net>
Date: Wed, 08 Jul 2009 08:18:19 -0500
From: Larry Finger <Larry.Finger@lwfinger.net>
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To: Pekka Enberg <penberg@cs.helsinki.fi>
CC: David Rientjes <rientjes@google.com>, "Rafael J. Wysocki" <rjw@sisk.pl>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Kernel Testers List <kernel-testers@vger.kernel.org>,
       Johannes Berg <johannes@sipsolutions.net>
Subject: Re: [Bug #13319] Page allocation failures with b43 and p54usb
References: <tSdKBEwEOhE.A.2wF.s_oUKB@chimera>	 <bXZeuxPQAWE.A.Y2.2BpUKB@chimera> <4A529F60.7010509@lwfinger.net>	 <alpine.DEB.2.00.0907062302540.10840@chino.kir.corp.google.com> <84144f020907062357m6a75d2eav1589e7f8b4a3d887@mail.gmail.com>
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Pekka Enberg wrote:
> 
> Yup, if it's not too much trouble Larry, I'd appreciate if you gave it
> a spin before I apply the sucker. Note to regression trackers, I don't
> think this should go to -stable because it depends on other patches in
> mainline and there's an obvious workaround for the problem (disable
> CONFIG_SLUB_DEBUG_ON). Furthermore, it's very unlikely people will hit
> this on production configurations anyway.

Pekka,

I have been running the patch for ~24 hours with slub_debug=0 as a
boot option. So far, no problems. My workload has not involved as many
network operations as some times, but my memory has not fragmented.
The output of 'cat /proc/buddyinfo' is as follows:

Node 0, zone      DMA      8      5      5      4      5      5      5
     4      3      0      1
Node 0, zone    DMA32   1804   1585   3007     36      0      0      0
     0      1      0      0

As might be expected, the high-order fragments are gone, but the O(1)
pieces have not been depleted.

Larry

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