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

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Message-ID: <20091204185303.GL28697@random.random>
Date:	Fri, 4 Dec 2009 19:53:03 +0100
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Chris Wright <chrisw@...hat.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Izik Eidus <ieidus@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 2/9] ksm: let shared pages be swappable

On Fri, Dec 04, 2009 at 09:16:40AM -0800, Chris Wright wrote:
> That's why I mentioned the page of zeroes as the prime example of
> something with a high mapcount that shouldn't really ever be evicted.

Just a nitpick, "never" is too much, it should remain evictable if
somebody halts all VM from monitor and starts a workloads that fills
RAM and runs for a very prolonged time pushing all VM into swap. This
is especially true if we stick to the below approach and it isn't
just 1 page in high-sharing.

> It's a somewhat special case, but wouldn't it be useful to have a generic
> method to recognize this kind of sharing since it's a generic issue?

Agreed.
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