linux-kernel - Re: [PATCH 0/3] Use one zonelist per node instead of multiple zonelists v2

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Message-ID: <Pine.LNX.4.64.0708091437580.32324@schroedinger.engr.sgi.com>
Date:	Thu, 9 Aug 2007 14:40:22 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andi Kleen <ak@...e.de>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, Lee.Schermerhorn@...com,
	pj@....com, kamezawa.hiroyu@...fujitsu.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 0/3] Use one zonelist per node instead of multiple
 zonelists v2

On Thu, 9 Aug 2007, Andi Kleen wrote:

> > I think I'll duck this for now on im-trying-to-vaguely-stabilize-mm grounds.
> > Let's go with the horrible-hack for 2.6.23, then revert it and get this
> > new approach merged and stabilised over the next week or two?
> 
> I would prefer to not have horrible hacks even temporary

The changes that we are considering for 2.6.24 will result in a single 
zonelist per zone that will filter the zoneslist in alloc_pages. This lead 
to a performance improvement in the page allocator.

What you call a hack is doing the same for the special policy zonelist in 
2.6.23 in order to be able to apply policies to the two highest zones. We 
apply a limited portion of the changes for 2.6.24 to .23 to fix the 
ZONE_MOVABLE issue.

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