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

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Message-Id: <20090608173219.0588af26.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 8 Jun 2009 17:32:19 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Rik van Riel <riel@...hat.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>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>
Subject: Re: [Bug #13319] Page allocation failures with b43 and p54usb

On Sun, 07 Jun 2009 11:35:27 -0500
Larry Finger <Larry.Finger@...inger.net> wrote:

> Pekka Enberg wrote:
> > On Sun, Jun 7, 2009 at 5:19 PM, Rik van Riel <riel@...hat.com> wrote:
> >> That is a very strange trace.  The Mem-Info indicates
> >> that the system has more than enough memory free, and
> >> also enough memory in higher-order free blocks.
> >>
> >> This would indicate a bug somewhere in the page
> >> allocator - this memory should have been given to this
> >> allocation request.
> > 
> > Aha, I always have difficulties deciphering the traces. But lets
> > invite Mel to the party then!
> 
> I'm happy to see some action on this problem. As usual, I'm happy to
> test patches and/or provide diagnostic output.
> 
One question. 

Did your system fragmented in same way as to this
(see DMA32, 10052 of order-0 pages) in older kernel ? I think you can check
fragmentation status via /proc/buddyinfo.
=
kernel: Node 0 DMA: 3*4kB 3*8kB 5*16kB 2*32kB 4*64kB 1*128kB 2*256kB 0*512kB
1*1024kB 0*2048kB 0*4096kB = 2100kB
kernel: Node 0 DMA32: 10062*4kB 1*8kB 1*16kB 0*32kB 1*64kB 1*128kB 0*256kB
1*512kB 0*1024kB 0*2048kB 0*4096kB = 40976kB
==

Thanks,
-Kame


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