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Date:	Mon, 4 Jan 2010 08:48:38 +0900
From:	KAMEZAWA Hiroyuki <>
To:	KOSAKI Motohiro <>
Cc:	LKML <>, linux-mm <>,
	Andrew Morton <>,
	Balbir Singh <>,
	Mel Gorman <>
Subject: Re: [PATCH 1/4] vmstat: remove zone->lock from walk_zones_in_node

On Mon, 28 Dec 2009 16:47:22 +0900 (JST)
KOSAKI Motohiro <> wrote:

> The zone->lock is one of performance critical locks. Then, it shouldn't
> be hold for long time. Currently, we have four walk_zones_in_node()
> usage and almost use-case don't need to hold zone->lock.
> Thus, this patch move locking responsibility from walk_zones_in_node
> to its sub function. Also this patch kill unnecessary zone->lock taking.
> Cc: Mel Gorman <>
> Signed-off-by: KOSAKI Motohiro <>

Reviewd-by: KAMEZAWA Hiroyuki <>

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