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Subject[patch] CFS scheduler, -v13

i'm pleased to announce release -v13 of the CFS scheduler patchset.

The CFS patch against v2.6.22-rc1, v2.6.21.1 or v2.6.20.10 can be
downloaded from the usual place:

http://people.redhat.com/mingo/cfs-scheduler/

-v13 is a fixes-only release. It fixes a smaller accounting bug, so if
you saw small lags during desktop use under certain workloads then
please re-check that workload under -v13 too. It also tweaks SMP
load-balancing a bit. (Note: the load-balancing artifact reported by
Peter Williams is not a CFS-specific problem and he reproduced it in
v2.6.21 too. Nevertheless -v13 should be less prone to such artifacts.)

I know about no open CFS regression at the moment, so please re-test
-v13 and if you still see any problem please re-report it. Thanks!

Changes since -v12:

- small tweak: made the "fork flow" of reniced tasks zero-sum

- debugging update: /proc/<PID>/sched is now seqfile based and echoing
0 to it clears the maximum-tracking counters.

- more debugging counters

- small rounding fix to make the statistical average of rounding errors
zero

- scale both the runtime limit and the granularity on SMP too, and make
it dependent on HZ

- misc cleanups

As usual, any sort of feedback, bugreport, fix and suggestion is more
than welcome,

Ingo
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