From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pekka Enberg <penberg-bbCR+/B0CizivPeTLB3BmA@public.gmane.org>
Subject: Re: [Bug #13319] Page allocation failures with b43 and p54usb
Date: Wed, 10 Jun 2009 19:06:55 +0300
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To: Johannes Berg <johannes-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>
Cc: Larry Finger <Larry.Finger-tQ5ms3gMjBLk1uMJSBkQmQ@public.gmane.org>, David Rientjes <rientjes-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>, Mel Gorman <mel-wPRd99KPJ+uzQB+pC5nmwQ@public.gmane.org>, Rik van Riel <riel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, "Rafael J. Wysocki" <rjw-KKrjLPT3xs0@public.gmane.org>, Linux Kernel Mailing List <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Kernel Testers List <kernel-testers-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>, KOSAKI Motohiro <kosaki.motohiro-+CUm20s59erQFUHtdCDX3A@public.gmane.org>, KAMEZAWA Hiroyuki <kamezawa.hiroyu-+CUm20s59erQFUHtdCDX3A@public.gmane.org>, Christoph Lameter <cl-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>, npiggin-l3A5Bk7waGM@public.gmane.org, yanmin.zhang-VuQAYsv1563Yd54FQh9/CA@public.gmane.org

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