Interesting. THis needs about two bytes per page for the counter?


On Wed, 1 Nov 2000, David Greenman wrote:

> >What paging strategy does FreeBSD currently use? Is it LRU or some
> >approximation to it? How much memory does this strategy take up in its
> >current implementation?
>    It's probably nothing like anything you've heard of before. It's closest
> to LOU (least often used). We look at the page's reference flag and
> increment/decrement a counter depending on it. The rate that we look at
> the reference flag is also roughly proportional to the rate at which new
> pages are needed. This algorithm has proven to be extremely effective and
> does much better than simple LRU.
> -DG
> David Greenman
> Co-founder, The FreeBSD Project -
> President, TeraSolutions, Inc. -
> Pave the road of life with opportunities.

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