Re: process selection

[kanoj@google.engr.sgi.com (Kanoj Sarcar)]

> 
> Could it be an idea to take the 'sleeping time' of each
> process into account when selecting which process to swap
> out?  Due to extreme lack of free time, I'm asking what
> you folks think of it before testing it myself...
>

You are right, sleep time is a good heuristic to determine 
the "swappability" of a process. 

Hmm, I wonder if this is what happended in your case: setiathome
probably had a big rss, but netscape and X probably had 
larger rss and got selected for stealing. 

These are just a couple of things probably worth trying out:
1. The stealing algorithm can be upgraded to steal more than just
SWAP_CLUSTER_MAX, for all the work it does.
2. Also, in swap_out, it might make sense to steal more than a
single page from a victim process, to balance the overhead of
scanning all the processes.

Kanoj
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