linux-kernel - Re: [PATCH 3/7] VM_LOCKED check don't need pte lock

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Date:	Sun, 06 Dec 2009 14:41:54 -0500
From:	Rik van Riel <riel@...hat.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Larry Woodman <lwoodman@...hat.com>
Subject: Re: [PATCH 3/7] VM_LOCKED check don't need pte lock

On 12/04/2009 03:42 AM, KOSAKI Motohiro wrote:
>  From 24f910b1ac966c21ea5aab825d1f26815b760304 Mon Sep 17 00:00:00 2001
> From: KOSAKI Motohiro<kosaki.motohiro@...fujitsu.com>
> Date: Thu, 3 Dec 2009 16:06:47 +0900
> Subject: [PATCH 3/7] VM_LOCKED check don't need pte lock
>
> Currently, page_referenced_one() check VM_LOCKED after taking ptelock.
> But it's unnecessary. We can check VM_LOCKED before to take lock.
>
> This patch does it.

Nice optimization.

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

Reviewed-by: Rik van Riel <riel@...hat.com>

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