Performance counters for POWER

The following series of patches extends Ingo and Thomas's performance
counter framework to add support for 64-bit POWER processors.
Currently I have the PPC970 family and POWER6 done.

The approach I have taken is to do the constraint checking and the
search through the space of alternative event codes as each group of
counters is added at the time a task is scheduled in.  That means we
are potentially doing the search several times in a row, with
interrupts disabled.  I think it will be OK since there are only a few
events that have alternatives (and not many of them), and the
constraint checking is fast since it is just simple integer
operations.  However, one of the things I plan to do is to instrument
that code to find out how long it takes in the worst case.  (If it
takes too long then I will need some major changes to the generic
code.)

This series is also available via git at:

git://git.kernel.org/pub/scm/linux/kernel/git/paulus/perfcounters.git

in the master branch.

Paul.
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