> >Nice, but *how* ?
> >Does it just use `map 8 implies prefetch 16-31' ?
> >If so, what if the application does 1 3 5 7 9 ?
> >Or what if the application does `1 567 34 90 9486 8' ?
> >Should the last 8 trigger prefetch of 16-31 ?
>
> This is not really a problem, I don't think.
> A simple heuristic *could* be: when X pages have been
> accessed in the cluster in increasing order (or
> even just mostly increaing order, or decreasing order,
> etc...)
Too complicated. Just testing for presence and page count
(mapped or not?) gives us more than enough info to account
for both readahead size _and_ direction (if any).
cheers,
Rik -- the flu hits, the flu hits, the flu hits -- MORE
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| Linux memory management tour guide. H.H.vanRiel@phys.uu.nl |
| Scouting Vries cubscout leader. http://www.phys.uu.nl/~riel/ |
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