Here: http://kernel.org/pub/linux/kernel/p...k/patches/2.6/ you'll find Con's patches. Last set in the pre-2.6.30 series is 2.6.22, you'll need to port the swap-prefetch patch from there to N900 2.6.28. For such task, you may use linuxhq.org diff engine to follow changes in a given kernel file, and the linux crossreference webpages (for example http://lxr.free-electrons.com/) to search functions, and "grep -R" in the kernel sources a lot. Depending on the divergence in the vm subsystem between those two releases, the task can go from easy to almost impossible unless you are a kernel hacker.