linux-kernel - Re: [PATCH] x86: numa: drop ZONE

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Message-ID: <alpine.DEB.2.02.1406111553430.27885@chino.kir.corp.google.com>
Date:	Wed, 11 Jun 2014 15:54:02 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Christoph Lameter <cl@...two.org>
cc:	Luiz Capitulino <lcapitulino@...hat.com>,
	Yinghai Lu <yinghai@...nel.org>, Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Rik van Riel <riel@...hat.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Linux MM <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH] x86: numa: drop ZONE_ALIGN

On Wed, 11 Jun 2014, Christoph Lameter wrote:

> > > The zone should not cross the 8M boundary?
> >
> > Yes, but the question is: why?
> 
> zones need to be aligned so that the huge pages order and other page
> orders allocated from the page allocator are at their "natural alignment".
> Otherwise huge pages cannot be mapped properly and various I/O devices
> may encounter issues if they rely on the natural alignment.
> 

Any reason not to align to HUGETLB_PAGE_ORDER on x86 instead of 
ZONE_ALIGN?
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