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

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Message-ID: <20091228041731.GI3601@balbir.in.ibm.com>
Date:	Mon, 28 Dec 2009 09:47:31 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Minchan Kim <minchan.kim@...il.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>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH -mmotm-2009-12-10-17-19] Prevent churning of zero page in
 LRU list.

* Rik van Riel <riel@...hat.com> [2009-12-27 23:12:07]:

> On 12/27/2009 10:57 PM, Balbir Singh wrote:
> >* Balbir Singh<balbir@...ux.vnet.ibm.com>  [2009-12-28 09:26:39]:
> >
> >>* Rik van Riel<riel@...hat.com>  [2009-12-27 22:22:20]:
> >>
> >>>On 12/27/2009 09:53 PM, Minchan Kim wrote:
> >>>>
> >>>>VM doesn't add zero page to LRU list.
>      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 
> >>Frequent moving of zero page should ideally put it to the head of the
> >>LRU list, leaving it untouched is likely to cause it to be scanned
> >>often - no? Should this be moved to the unevictable list?
> >>
> >
> >Sorry, I replied to wrong email, I should have been clearer that this
> >question is for Minchan Kim.
> 
> The answer to your question is all the way up in
> Minchan Kim's original email.
> 
> The zero page is never on the LRU lists to begin with.
>

Aahh.. my bad... I should have looked at it more closely! 

-- 
	Balbir
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