linux-kernel - Re: [PATCH 00/35] Cleanup and optimise the page allocator V3

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Message-ID: <20090316104054.GA23046@wotan.suse.de>
Date:	Mon, 16 Mar 2009 11:40:54 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Linux Memory Management List <linux-mm@...ck.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	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>
Subject: Re: [PATCH 00/35] Cleanup and optimise the page allocator V3

On Mon, Mar 16, 2009 at 09:45:55AM +0000, Mel Gorman wrote:
> Here is V3 of an attempt to cleanup and optimise the page allocator and should
> be ready for general testing. The page allocator is now faster (16%
> reduced time overall for kernbench on one machine) and it has a smaller cache
> footprint (16.5% less L1 cache misses and 19.5% less L2 cache misses for
> kernbench on one machine). The text footprint has unfortunately increased,
> largely due to the introduction of a form of lazy buddy merging mechanism
> that avoids cache misses by postponing buddy merging until a high-order
> allocation needs it.

You!? You want to do lazy buddy? ;) That's wonderful, but it would
significantly increase the fragmentation problem, wouldn't it?
(although pcp lists are conceptually a form of lazy buddy already)

No objections from me of course, if it is making significant
speedups. I assume you mean overall time on kernbench is overall sys
time?

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