Here is an updated patch to perform swap prefetching. This version is even 
more conservative at deciding when to start prefetching, not doing it if 
there is any significant amount of dirty ram. Other changes are minor 
cleanups and comments.

Latest patch is available here:

http://ck.kolivas.org/patches/swap-prefetch/

and attached below for 2.6.13.

This version is effectively what is included in 2.6.13-ck3

Cheers,
Con