linux-kernel - Re: [PATCH 1/4] vmstat: remove zone->lock from walk_zones_in

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Message-Id: <20100104084838.fd229ec0.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 4 Jan 2010 08:48:38 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Mel Gorman <mel@....ul.ie>
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 <kosaki.motohiro@...fujitsu.com> 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 <mel@....ul.ie>
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>

Reviewd-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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