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

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Message-ID: <Pine.LNX.4.64.0902230913080.20371@melkki.cs.Helsinki.FI>
Date:	Mon, 23 Feb 2009 09:14:03 +0200 (EET)
From:	Pekka J Enberg <penberg@...helsinki.fi>
To:	Mel Gorman <mel@....ul.ie>
cc:	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

On Sun, 22 Feb 2009, Mel Gorman wrote:
> 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>

You can do that in a cleaner way by defining ALLOC_CPUSET to be zero when 
CONFIG_CPUSETS is disabled. Something like following untested patch:

Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
---

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 5675b30..18b687d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1135,7 +1135,12 @@ failed:
 #define ALLOC_WMARK_HIGH	0x08 /* use pages_high watermark */
 #define ALLOC_HARDER		0x10 /* try to alloc harder */
 #define ALLOC_HIGH		0x20 /* __GFP_HIGH set */
+
+#ifdef CONFIG_CPUSETS
 #define ALLOC_CPUSET		0x40 /* check for correct cpuset */
+#else
+#define ALLOC_CPUSET		0x00
+#endif
 
 #ifdef CONFIG_FAIL_PAGE_ALLOC
 
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