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Subject[patch] CFS scheduler, -v18

i'm pleased to announce release -v18 of the CFS scheduler patchset.

The rolled-up CFS patch against today's -git kernel, v2.6.22-rc5,
v2.6.22-rc4-mm2, v2.6.21.5 or v2.6.20.14 can be downloaded from the
usual place:

The biggest change in -v18 are various performance related improvements.
Thomas Gleixner has eliminated expensive 64-bit divisions by converting
the arithmetics to scaled math (without impacting the quality of
calculations). Srivatsa Vaddagiri and Dmitry Adamushko have continued
the abstraction and cleanup work. Srivatsa Vaddagiri and Christoph
Lameter fixed the NUMA balancing bug reported by Paul McKenney. There
were also a good number of other refinements to the CFS code. (No
reproducible behavioral regressions were reported against -v17 so far,
so the 'behavioral' bits are mostly unchanged.)

Changes since -v17:

- implement scaled math speedups for CFS. (Thomas Gleixner)

- lots of core code updates, cleanups and streamlining.
(Srivatsa Vaddagiri, Dmitry Adamushko, me.)

- bugfix: fix NUMA balancing. (Srivatsa Vaddagiri, Christoph Lameter,
Paul E. McKenney)

- feature: SCHED_IDLE now also implies block-scheduler (CFQ)
idle-IO-priority. (suggested by Thomas Sattler, picked up from -ck)

- build fix for ppc32. (reported, tested and confirmed fixed by
Art Haas)

- ARM fix. (reported and debugged by Thomas Gleixner)

- cleanup: implemented idle_sched_class in kernel/sched_idletask.c as a
way to separate out rq->idle handling out of the core scheduler. This
made a good deal of idle-task related special-cases go away.

- debug: make the sysctls safer by introducing high and low limits.

- cleanup: move some of the debug counters to under CONFIG_SCHEDSTATS.

- speedup: various micro-optimizations

- various other small updates.

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

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