Re: Another wish item for your TODO list...

[Rik van Riel <riel@conectiva.com.br>]

On Mon, 23 Oct 2000, Stephen C. Tweedie wrote:
> On Mon, Oct 23, 2000 at 04:07:02PM -0200, Rik van Riel wrote:
> 
> > > 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.
> 
> It probably only makes real sense to do this for inodes which
> are not in use, anyway, which avoids that problem completely.

FreeBSD has a neat solution for this:

- if the memory item (file, shm segment, ...) is in use, move
  the page to the inactive list (equivalent to our inactive_dirty)
- if the item isn't in use, move the page to the cache list
  (equivalent to our inactive_clean list)

We could extend this by moving *every* page of an item which
isn't in use to the inactive_clean list once we move ONE page
of such an item to that list (or reclaim it?).

[IMHO we don't want to free the page ... no need to throw away
the data in the page too soon]

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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