The last known bugs were addressed in this latest version of the swap 
prefetching patch. Thanks to the testers out there who helped it get this 
far.

-Prefetched pages weren't handled properly by the lru lists.
-Prefetch groups are now 10 times larger when laptop_mode is enabled thus 
decreasing the amount of time spent prefetching and thus the disk spinning.
-Documentation as suggested by Ingo Oeser

Incremental patches and latest available here:
http://ck.kolivas.org/patches/swap-prefetch/

Cheers,
Con
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