Tweaking swap algorithm under constrained memory usage

[Pawan Singh]

I have a requirement where a user space process needs to allocate 75%
of the memory on the machine and keep it locked i.e. not swappable.
Other processes need to share the rest of the memory. Swap is enabled.
I was wondering what tweaks would be required so that the swapping
alogrithms' thresholds are based on 25% of the memory rather than on
100% of the memory. If I leave this at default, kswapd may decide to
swap a lot more pages than really required because 75% of pages are
locked. I am working on 2.6.22 kernel. I can use "swappiness" factor
and reduce it - but I wanted to know if I can alter something
fundamental in the kernel code to make life for rest of the processes
better.

Thanks for any suggestions.

-Pawan
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