linux-kernel - Re: [PATCH 07/20] Simplify the check on whether cpusets are a factor or not

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Date:	Mon, 23 Feb 2009 15:19:54 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	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>
Subject: Re: [PATCH 07/20] Simplify the check on whether cpusets are a
	factor or not

Hi Mel,

On Mon, 2009-02-23 at 11:39 +0000, Mel Gorman wrote:
> An #ifdef in a function is ugly all right. Here is a slightly
> different
> version based on your suggestion. Note the definition of number_of_cpusets
> in the !CONFIG_CPUSETS case. I didn't call cpuset_zone_allowed_softwall()
> for the preferred zone in case it wasn't in the cpuset for some reason and
> we incorrectly disabled the cpuset check.
> 
> =====
> Simplify the check on whether cpusets are a factor or not
> 
> The check whether cpuset contraints need to be checked or not is complex
> and often repeated.  This patch makes the check in advance to the comparison
> is simplier to compute.
> 
> Signed-off-by: Mel Gorman <mel@....ul.ie>

Looks good to me!

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