linux-kernel - Re: [RFC][PATCH] mm: the page of MIGRATE

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Message-Id: <20081207172115.53E1.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Sun,  7 Dec 2008 17:22:48 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	kosaki.motohiro@...fujitsu.com,
	Christoph Lameter <cl@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [RFC][PATCH] mm: the page of MIGRATE_RESERVE don't insert into pcp

> 
> ====== CUT HERE ======
> From: Mel Gorman <mel@....ul.ie>
> Subject: [RFC] Split per-cpu list into one-list-per-migrate-type
> 
> Currently the per-cpu page allocator searches the PCP list for pages of the
> correct migrate-type to reduce the possibility of pages being inappropriate
> placed from a fragmentation perspective. This search is potentially expensive
> in a fast-path and undesirable. Splitting the per-cpu list into multiple lists
> increases the size of a per-cpu structure and this was potentially a major
> problem at the time the search was introduced. These problem has been
> mitigated as now only the necessary number of structures is allocated for the
> running system.
> 
> This patch replaces a list search in the per-cpu allocator with one list
> per migrate type that should be in use by the per-cpu allocator - namely
> unmovable, reclaimable and movable.
> 
> Signed-off-by: Mel Gorman <mel@....ul.ie>

Great.

this patch works well on my box too.
and my review didn't find any bug.

very thanks.

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




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