linux-kernel - Re: [RFC PATCH 0/3] Reduce searching in the page allocator fast-path

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Date:	Wed, 19 Aug 2009 10:08:44 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Linux Memory Management List <linux-mm@...ck.org>,
	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 0/3] Reduce searching in the page allocator
	fast-path

On Tue, Aug 18, 2009 at 03:05:25PM -0400, Christoph Lameter wrote:
> On Tue, 18 Aug 2009, Mel Gorman wrote:
> 
> > Can you point me to which patchset you are talking about specifically that
> > uses per-cpu atomics in the hot path? There are a lot of per-cpu patches
> > related to you that have been posted in the last few months and I'm not sure
> > what any of their merge status' is.
> 
> The following patch just moved the page allocator to use the new per cpu
> allocator. It does not use per cpu atomic yet but its possible then.
> 
> http://marc.info/?l=linux-mm&m=124527414206546&w=2
> 

Ok, I don't see this particular patch merged, is it in a merge queue somewhere?

After glancing through, I can see how it might help.  I'm going to drop patch
3 of this set that shuffles data from the PCP to the zone and take a closer
look at those patches. Patch 1 and 2 of this set should still go ahead. Do
you agree?

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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