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

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Message-ID: <20090323145921.GC15416@csn.ul.ie>
Date:	Mon, 23 Mar 2009 14:59:21 +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 Mon, Mar 23, 2009 at 09:30:26AM -0400, Christoph Lameter wrote:
> On Mon, 23 Mar 2009, Mel Gorman wrote:
> 
> > 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.
> 
> Certainly there is some minimal benefit. But maybe that benefit will
> vanish if you drop the doubly linked list?
> 

Extremely difficult to tell. It only makes a difference if you are not
over a cache-line boundary using a singly linked list. If the structure
is within a cache-line boundary with either single or double linked
lists, it probably makes no measurable difference.

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