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

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Message-ID: <alpine.DEB.2.00.0906291642520.17663@chino.kir.corp.google.com>
Date:	Mon, 29 Jun 2009 16:47:57 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Larry Finger <Larry.Finger@...inger.net>
cc:	"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>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [Bug #13319] Page allocation failures with b43 and p54usb

On Mon, 29 Jun 2009, Larry Finger wrote:

> > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=13319
> > Subject		: Page allocation failures with b43 and p54usb
> > Submitter	: Larry Finger <Larry.Finger@...inger.net>
> > Date		: 2009-04-29 21:01 (61 days old)
> > References	: http://marc.info/?l=linux-kernel&m=124103897101088&w=4
> > 		  http://lkml.org/lkml/2009/6/7/136
> > Handled-By	: Johannes Berg <johannes@...solutions.net>
> 
> The cause of these failures has been determined. The wireless
> subsystem frequently requests buffers of size 4096, but when SLUB
> debugging is enabled and the debug info is added, the request becomes
> of order 1 and memory becomes fragmented.
> 
> A controversial "fix" in which SLUB debugging was disabled for
> allocations where adding such debugging info would increase the order
> was discussed and tried. With a quick look at the commit list for
> Linus's tree, I don't see that such a patch is available, but I will
> be corrected if I missed it.
> 

I'd disagree with disabling slub debugging by default for caches where 
oo_order(s->min) increases as the result of using it.  This particular 
page allocation failure is happening for, presumably, kmalloc-4096, and 
the system has 4K pages.  Disabling debugging for that cache (and any of 
its aliases) implicitly will lead to errors going undiagnosed as a result.
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