linux-kernel - Re: [PATCH 00/25] Cleanup and optimise the page allocator V5

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Message-ID: <20090323115213.GC6484@csn.ul.ie>
Date:	Mon, 23 Mar 2009 11:52:14 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Linux Memory Management List <linux-mm@...ck.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lin Ming <ming.m.lin@...el.com>,
	Zhang Yanmin <yanmin_zhang@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 00/25] Cleanup and optimise the page allocator V5

On Fri, Mar 20, 2009 at 03:43:23PM -0400, Christoph Lameter wrote:
> On Fri, 20 Mar 2009, Mel Gorman wrote:
> 
> > > Is it possible to go to a simple
> > > linked list (one cacheline to be touched)?
> >
> > I considered it but it breaks the hot/cold allocation/freeing logic and
> > the search code became weird enough looking fast enough that I dropped
> > it.
> 
> Maybe it would be workable if we drop the cold queue stuff (dubious
> anyways)?
> 

This came up again. There was some evidence when it was introduced that
it worked and micro-benchmarks can show it to be of some use. It's
not-obvious-enough that I'd be wary of deleting it.

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