linux-kernel - Re: [PATCH 06/10] ksm: identify PageKsm pages

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Message-ID: <20090721180059.GG2239@random.random>
Date:	Tue, 21 Jul 2009 20:01:00 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Izik Eidus <ieidus@...hat.com>, akpm@...ux-foundation.org,
	hugh.dickins@...cali.co.uk, chrisw@...hat.com, avi@...hat.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	nickpiggin@...oo.com.au, Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: [PATCH 06/10] ksm: identify PageKsm pages

On Tue, Jul 21, 2009 at 01:55:13PM -0400, Rik van Riel wrote:
> I guess that if they are to remain unswappable, they
> should go onto the unevictable list.

They should indeed. Not urgent but it will optimize the vm (as in
virtual memory) cpu load a bit.

> Then again, I'm guessing this is all about to change
> in not too much time :)

That's my point, current implementation of PageKsm don't seem to last
long, and if we keep logic the same it'll likely happen soon that
PageKsm != PageAnon on a Ksm page. So I'd rather keep it different
even now, given I doubt it's moving the needle anywhere in ksm code.
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