linux-kernel - Re: [PATCH -mmotm-2009-12-10-17-19] Prevent churning of zero page in LRU list.

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Message-Id: <20091228121758.A67E.A69D9226@jp.fujitsu.com>
Date:	Mon, 28 Dec 2009 12:18:38 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH -mmotm-2009-12-10-17-19] Prevent churning of zero page in LRU list.

> 
> VM doesn't add zero page to LRU list. 
> It means zero page's churning in LRU list is pointless. 
> 
> As a matter of fact, zero page can't be promoted by mark_page_accessed
> since it doesn't have PG_lru. 
> 
> This patch prevent unecessary mark_page_accessed call of zero page 
> alghouth caller want FOLL_TOUCH. 
> 
> Signed-off-by: Minchan Kim <minchan.kim@...il.com>

Looks good to me.
	Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>



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