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From: Daniel Phillips <phillips@bonn-fries.net>
To: Marco Colombo <marco@esi.it>, Rik van Riel <riel@conectiva.com.br>
Subject: Re: VM Requirement Document - v0.0
Date: Tue, 3 Jul 2001 20:24:14 +0200
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An ammendment to my previous post...

> I see three page priority levels:
>
>   0 - accessed-never/aged to zero
>   1 - accessed-once/just loaded
>   2 - accessed-often
>
> with these transitions:
>
>   0 -> 1, if a page is accessed
>   1 -> 2, if a page is accessed a second time
>   1 -> 0, if a page gets old
>   2 -> 0, if a page gets old

Better:

   1 -> 0, if a page was not referenced before arriving at the old end
   1 -> 2, if it was

Meaning that multiple accesses to pages on the level 1 list are treated as a 
single access.  In addition, this reflects what we can do practically with 
the hardware referenced bit.

--
Daniel
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