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From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Subject: Re: [PATCH 08/25] Calculate the preferred zone for allocation only once
In-Reply-To: <1240266011-11140-9-git-send-email-mel@csn.ul.ie>
References: <1240266011-11140-1-git-send-email-mel@csn.ul.ie> <1240266011-11140-9-git-send-email-mel@csn.ul.ie>
Message-Id: <20090421155256.F133.A69D9226@jp.fujitsu.com>
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Date: Tue, 21 Apr 2009 16:03:59 +0900 (JST)
Sender: owner-linux-mm@kvack.org
To: Mel Gorman <mel@csn.ul.ie>
Cc: kosaki.motohiro@jp.fujitsu.com, Linux Memory Management List <linux-mm@kvack.org>, Christoph Lameter <cl@linux-foundation.org>, Nick Piggin <npiggin@suse.de>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Lin Ming <ming.m.lin@intel.com>, Zhang Yanmin <yanmin_zhang@linux.intel.com>, Peter Zijlstra <peterz@infradead.org>, Pekka Enberg <penberg@cs.helsinki.fi>, Andrew Morton <akpm@linux-foundation.org>
List-ID: <linux-mm.kvack.org>

> get_page_from_freelist() can be called multiple times for an allocation.
> Part of this calculates the preferred_zone which is the first usable
> zone in the zonelist. This patch calculates preferred_zone once.
> 
> Signed-off-by: Mel Gorman <mel@csn.ul.ie>

I'm not sure this patch improve performance largely or not.
but I don't find the bug.


	Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>




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