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

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Date:	Wed, 10 Jun 2009 19:06:55 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Larry Finger <Larry.Finger@...inger.net>,
	David Rientjes <rientjes@...gle.com>,
	Mel Gorman <mel@....ul.ie>, 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>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>, npiggin@...e.de,
	yanmin.zhang@...ux.intel.com
Subject: Re: [Bug #13319] Page allocation failures with b43 and p54usb

On Wed, 2009-06-10 at 17:52 +0200, Johannes Berg wrote:
> On Wed, 2009-06-10 at 18:49 +0300, Pekka Enberg wrote:
> > On Wed, 2009-06-10 at 18:44 +0300, Pekka Enberg wrote:
> > 
> > > Aha, SLUB thinks the minimum order for 4096 is 1. I guess you have
> > > CONFIG_SLUB_DEBUG enabled? If yes, something like to following should
> > > help. Christoph, are you okay with this patch?
> 
> 
> > +	if ((size + MAX_DEBUG_SIZE) >= PAGE_SIZE)
> 
> && size <= PAGE_SIZE
> 
> ? Or is this a path that only happens for small allocations?

Anything that's beyond PAGE_SIZE * 2 is passed straight to the page
allocator and the intent of this patch is to disable debugging for all
big caches like SLAB does.

			Pekka

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