Date: Mon, 14 Sep 2009 11:42:15 -0400 (EDT)
From: Christoph Lameter <cl@linux-foundation.org>
To: Zhu Yi <yi.zhu@intel.com>
cc: Mel Gorman <mel@csn.ul.ie>,
	"Chatre, Reinette" <reinette.chatre@intel.com>,
	Frans Pop <elendil@planet.nl>,
	Larry Finger <Larry.Finger@lwfinger.net>,
	"John W. Linville" <linville@tuxdriver.com>,
	Pekka Enberg <penberg@cs.helsinki.fi>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>,
	"ipw3945-devel@lists.sourceforge.net"
	<ipw3945-devel@lists.sourceforge.net>,
	Andrew Morton <akpm@linux-foundation.org>,
	"Krauss, Assaf" <assaf.krauss@intel.com>,
	Johannes Berg <johannes@sipsolutions.net>,
	"Abbas, Mohamed" <mohamed.abbas@intel.com>
Subject: Re: iwlagn: order 2 page allocation failures
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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.