linux-kernel - Re: [PATCH] change global zonelist order on NUMA v2

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Message-ID: <Pine.LNX.4.64.0704261504090.19704@schroedinger.engr.sgi.com>
Date:	Thu, 26 Apr 2007 15:07:11 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Lee Schermerhorn <Lee.Schermerhorn@...com>
cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>, AKPM <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>
Subject: Re: [PATCH] change global zonelist order on NUMA v2

On Thu, 26 Apr 2007, Lee Schermerhorn wrote:

> Against 2.6.21-rc7 atop KAMEZAWA Hiroyuki's "change global zonelist
> order on NUMA v2" patch.

Hmmm.. hmmm... serious hackery here. Isnt there some way to simplify the 
core impact and make the arch select a strategy? A boot option would be
less impact (I am a bit concerned about switching zonelist mid stream).

The arch should be able to specify a default zone order. So the best thing 
would be to make the zone orders configurable in the page allocator and 
then have the arch code determine a default order depending on the 
hardware that we are running on.

Make sure that the !CONFIG_ZONE_DMA case works.

What about ZONE_DMA32 support?
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