Re: Fwd: Re: [PATCH][RFC] appling preasure to icache and dcache

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

On Tue, 3 Apr 2001, Ed Tomlinson wrote:
> On Tuesday 03 April 2001 11:03, Benjamin Redelings I wrote:
> > Hi, I'm glad somebody is working on this!  VM-time seems like a pretty
> > useful concept.
> 
> Think it might be useful for detecting trashing too.  If vmtime is
> made to directly relate to the page allocation rate then you can do
> something like this.  Let K be a number intially representing 25% of
> ram pages. Because vmtime is directly releated to allocation rates its
> meanful to subtract K from the current vmtime.  For each swapped out
> page, record the current vmtime.  Now if the recorded vmtime of the
> page you are swapping in is greater than vmtime-K increment A
> otherwise increment B. If A>B we are thrashing.  We decay A and B via
> kswapd.  We adjust K depending on the swapping rate.  Thoughts?

Hmmm, how exactly would this algorithm work ?

From your description above, I can't quite see how it would
work (or why it would work).

regards,

Rik
--
Virtual memory is like a game you can't win;
However, without VM there's truly nothing to lose...

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

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