linux-kernel - Re: [PATCH 2/9] ksm: let shared pages be swappable

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Date:	Fri, 04 Dec 2009 11:21:34 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
CC:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Izik Eidus <ieidus@...hat.com>,
	Chris Wright <chrisw@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 2/9] ksm: let shared pages be swappable

On 12/04/2009 09:45 AM, Andrea Arcangeli wrote:

> I think it's fishy to ignore the page_referenced retval and I don't
> like the wipe_page_referenced concept. page_referenced should only be
> called when we're in presence of VM pressure that requires
> unmapping. And we should always re-add the page to active list head,
> if it was found referenced as retval of page_referenced.

You are wrong here, for scalability reasons I explained
to you half a dozen times before :)

I agree with the rest of your email, though.

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