Subject: Re: Do some disk accesses miss the UVM?
To: Chuck Silvers <>
From: Perry E. Metzger <>
List: tech-kern
Date: 01/26/2002 12:59:42
Chuck Silvers <> writes:
> actually the generational idea isn't a replacement for the knobs.
> the generational bit still depends on the assumption that past behaviour
> is a good predictor of future behaviour, so it falls down just like the
> pre-knob code when that assumption isn't true.

Absolutely, but *every* policy does. The best part of the research of
the last 30 years on the subject is the realization that even if you
have a psychic computer that knows what the entire future of page use
will be, in the most general case it is still extremely
computationally expensive to determine what pages to evict.

Perry E. Metzger
NetBSD Development, Support & CDs.