Re: cp file /dev/zero <-> cache [was Re: increasing page size]

[Rik van Riel <H.H.vanRiel@phys.uu.nl>]

On Thu, 9 Jul 1998, Stephen C. Tweedie wrote:
> On Tue, 7 Jul 1998 13:50:02 -0400 (EDT), "Benjamin C.R. LaHaise"
> <blah@kvack.org> said:
> 
> > Right.  I'd rather see a multi-level lru like policy (ie on each cache hit
> > it gets moved up one level in the cache, with the lru'd pages from a given
>
> There's a fundamentally nice property about the multi-level cache
> which we _cannot_ easily emulate with page aging, and that is the
> ability to avoid aging any hot pages at all while we are just
> consuming cold pages.  For example, a large "find|xargs grep" can be
> satisfied without staling any of the existing hot cached pages.

Then I'd better incorporate a design for this in the zone
allocator (we could add this to the page_struct, but in
the zone_struct we can make a nice bitmap of it).

OTOH, is it really _that_ much different from an aging
scheme with an initial age of 1?

Rik.
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