linux-kernel - Re: iwlagn: order 2 page allocation failures

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Date:	Mon, 14 Sep 2009 18:59:42 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Zhu Yi <yi.zhu@...el.com>,
	"Chatre, Reinette" <reinette.chatre@...el.com>,
	Frans Pop <elendil@...net.nl>,
	Larry Finger <Larry.Finger@...inger.net>,
	"John W. Linville" <linville@...driver.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"ipw3945-devel@...ts.sourceforge.net" 
	<ipw3945-devel@...ts.sourceforge.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Krauss, Assaf" <assaf.krauss@...el.com>,
	Johannes Berg <johannes@...solutions.net>,
	"Abbas, Mohamed" <mohamed.abbas@...el.com>
Subject: Re: iwlagn: order 2 page allocation failures

On Mon, Sep 14, 2009 at 11:42:15AM -0400, Christoph Lameter wrote:
> On Mon, 14 Sep 2009, Zhu Yi wrote:
> 
> > BTW, does SLAB/SLUB guarantee size of multiple PAGE_SIZE __kmalloc()
> > allocation align on PAGE_SIZE (or 256 bytes) boundary?
> 
> Page allocators guarantee page aligned data. Slab allocators do not.
> 
> You can create a slab that aligns objects on 256 byte boundary if you
> want.
> 

The allocation of buffers >= PAGE_SIZE even when allocated with
kmalloc() are page-aligned though right? It's not an explicit guarantee
but is it not always the case?

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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