In case you're looking for an older version for some reason, here's a list of older patches available. Newer features have not been backported, so newer tools may not be usable.

Schedstats patch Version of output Auxiliary program(s) 2.5.59 version 1 stats-1 2.5.62 version 2 stats-2 2.5.62-mjb1 2.5.63 2.5.64 2.5.65 version 3 stats-3 2.5.66 2.5.68 2.5.69 2.6.0-test4 2.6.0-test5 2.6.0-test5 version 4 stats-4 2.6.0-test5-mm3 2.6.0-test5-mm4 2.6.0-test6 2.6.0-test6-mm1 2.6.0-test6-mm4 2.6.0-test7 2.6.0-test8 2.6.0-test9 2.6.0-test11 2.6.5-rc3

Schedstats patch Version of output Auxiliary program(s) 2.6.2-mm1 version 5 stats-5 2.6.3-mm1 2.6.3-mm3 2.6.3-mm4 2.6.4-mm1 version 6 stats-6 latency.c 2.6.4-mm2 2.6.5-rc2-mm1 2.6.5-rc2-mm2 2.6.5-rc2-mm3 2.6.5-rc2-mm4 2.6.5-rc2-mm5 2.6.5-rc3-mm1 2.6.5-rc3-mm4 2.6.8-rc2 version 9 stats-9 latency.c 2.6.8-rc2-mm1 2.6.8-rc2-mm2 2.6.8-rc3 2.6.8-rc4