John Fremlin's swap patch

John Fremlin's swap patch

[Benjamin Redelings I]

Hi John, I haven't had a chance to test your patch yet, but I will be
sure to try it when I get the chance.

Your analysis of the problems with the current use of swap_cnt seems
accurate - though i don't know much about cache miss speeds and such.  I
guess the problem won't fully be solved until the swapping routine is
based on pages instead of processes, and can scan pages on the inactive
list only.

-BenRI
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Benjamin Redelings I      <><     http://www.bol.ucla.edu/~bredelin/
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Re: John Fremlin's swap patch

[John Fremlin]

Benjamin Redelings I <bredelin@ucla.edu> writes:

> Your analysis of the problems with the current use of swap_cnt seems
> accurate - though i don't know much about cache miss speeds and such.  I
> guess the problem won't fully be solved until the swapping routine is
> based on pages instead of processes, and can scan pages on the inactive
> list only.

I agree. My patch was just a quick hack, the root of the problem is to
get a good way of finding pages to swap out.

I agree that going through the set of pages that can be discarded is
more reasonable (and logically less complex though I haven't got a
clear picture of how difficult it is to implement).

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