On Mon, 23 Oct 2000, Stephen C. Tweedie wrote:

On Mon, Oct 23, 2000 at 03:02:06PM -0200, Rik van Riel wrote:

quoted

quoted

Just a quick thought --- at some point it would be good if we
could add logic to the core VM so that for sequentially accessed
files, reclaiming any page of the file from cache would evict
the _whole_ of the file from cache.

I take it you mean "move all the pages from before the
currently read page to the inactive list", so we preserve
the pages we just read in with readahead ?

No, I mean that once we actually remove a page, we should also remove
all the other pages IF the file has never been accessed in a
non-sequential manner.  The inactive management is separate.

It's an optimisation in CPU time as much as for anything else:
there's just no point in doing expensive memory balancing/aging
for pages which we know are next to useless.

The problem here is that we shouldn't remove the pages which are
in the current readahead window, as those /will/ most likely be
used in the near future.

One option could be to free all inactive pages in the address
space of that file, but we'd still need to go around and find
them...

regards,

Rik
--
"What you're running that piece of shit Gnome?!?!"
       -- Miguel de Icaza, UKUUG 2000

http://www.conectiva.com/		http://www.surriel.com/

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