linux-kernel - Re: [Bug #13319] Page allocation failures with b43 and p54usb

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Message-ID: <4A549C9B.4060702@lwfinger.net>
Date:	Wed, 08 Jul 2009 08:18:19 -0500
From:	Larry Finger <Larry.Finger@...inger.net>
To:	Pekka Enberg <penberg@...helsinki.fi>
CC:	David Rientjes <rientjes@...gle.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Johannes Berg <johannes@...solutions.net>
Subject: Re: [Bug #13319] Page allocation failures with b43 and p54usb

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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