linux-kernel - Re: [PATCH] mm: inactive-clean list

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Message-ID: <Pine.LNX.4.64.0607251702560.464@schroedinger.engr.sgi.com>
Date:	Tue, 25 Jul 2006 17:05:54 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Rik van Riel <riel@...hat.com>
cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-mm <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: inactive-clean list

On Tue, 25 Jul 2006, Rik van Riel wrote:

> > Well, I read the whole thing before I replied and I could not figure this
> > one out. Maybe I am too dumb to understand. Could you please explain
> > yourself in more detail
> 
> Page state transitions can be very expensive in a virtualized
> environment, so it would be good if we had fewer transitions.

So the hypervisor indeed tracks each individual page state? Note that I do 
not propose to change the page state but a counter for page states. I am 
bit confused about how not touching a page can cause page state 
transitions. But then I do not know much about hypervisors. What magic is 
going on in the background that could enable the hypervisor to track 
counter increments?

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