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SubjectRe: Very aggressive swapping after 2 hours rest
On Sun, 17 Sep 2000, Andrea Arcangeli wrote:
> On Sun, Sep 17, 2000 at 02:33:48PM -0300, Rik van Riel wrote:
> > If you have a better idea for memory management, I'd
> > like to hear it ;)
>
> You know 2.4.0-test1-ac22-class++ beaten 2.4.0-test1-ac22-riel++
> under low memory scenario, right?

Btw, do you know /why/ this was the case?

I have a strong hunch this was because you moved some swap-out
pages out of the way of the rest of the pages on the LRU list.

The new VM, as integrated in -test9-pre1, does the same thing,
only for a lot more cases than your classzone patch did, achieving
the same effect, only stronger and effective in more different
situations.

Add to that page aging, and the drop-behind code that makes it
possible to do streaming IO without putting memory pressure on
the working set ....

(well, not in all cases ... drop_behind() and read-ahead don't
work for mmap() yet)

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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