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

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Date:	Thu, 26 Apr 2007 11:47:44 +0200
From:	Andi Kleen <ak@...e.de>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Linux-MM <linux-mm@...ck.org>,
	AKPM <akpm@...ux-foundation.org>,
	Christoph Lameter <clameter@....com>
Subject: Re: [PATCH] change global zonelist order on NUMA v2

On Thursday 26 April 2007 11:34:17 KAMEZAWA Hiroyuki wrote:
> 
> Changelog from V1 -> V2
> - sysctl name is changed to be relaxed_zone_order
> - NORMAL->NORMAL->....->DMA->DMA->DMA order (new ordering) is now default.
>   NORMAL->DMA->NORMAL->DMA order (old ordering) is optional.
> - addes boot opttion to set relaxed_zone_order. ia64 is supported now.
> - Added documentation
> 
> patch is against 2.6.21-rc7-mm2. tested on ia64 NUMA box. works well.

IMHO the change should be default (without any options) unless someone
can come up with a good reason why not. On x86-64 it should be definitely
default.

If there is a good reason on some architecture or machine a user option is also not a 
good idea, but instead it should be set automatically by that architecture or machine
on boot.

-Andi

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