On Tue, 4 Sep 2001, Jan Harkes wrote:
> NO, please don't add another list to fix the symptoms of bad page aging.
>
> One of the graduate students here at CMU has been looking at the 2.4 VM,
> trying to predict the size of the app that can possibly be loaded
> without causing the system to start trashing.
[snip results]
> Aging is broken. Horribly. As a result, the inactive list is filled with
> pages that are not necessarily inactive.
I've been working on a CPU and memory efficient reverse
mapping patch for Linux, one which will allow us to do
a bunch of optimisations for later on (infrastructure)
and has as its short-term benefit the potential for
better page aging.
It seems the balancing FreeBSD does (up aging +3, down
aging -1, inactive list in LRU order as extra stage) is
working nicely on my laptop now, but I don't think I'll
be releasing that as part of the patch ...
http://www.surriel.com/patches/2.4/2.4.8-ac12-pmap3
regards,
Rik
-- IA64: a worthy successor to i860.http://www.surriel.com/ http://distro.conectiva.com/
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This archive was generated by hypermail 2b29 : Fri Sep 07 2001 - 21:00:26 EST