Updated MSR tracing patchkit v2

From: Andi Kleen
Date: Thu Mar 19 2015 - 20:30:04 EST


This patchkit adds proper trace points for all MSR accesses. Very useful
for PMU (perf) debugging, but also various other CPU near areas.

Updated version:

- Now traces RDPMC too
- Add benchmarks on the overhead of moving MSR access out of line

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