Re: [PATCH] mm: inactive-clean list

[Christoph Lameter]

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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