Latest version of swap prefetching also available in incremental form and for 
download here:
http://ck.kolivas.org/patches/swap-prefetch/

-One unlocking bug was fixed
-Pages are prefetched inactive now so they're the first thing that is swapped 
back out again under pressure
-Numerous tweaks and cleanups including:
-Acted on suggestion by John Corbet (thanks!)

Cheers,
Con