The x86 kernel supports tracing most MSR (Model Specific Register) accesses.
To see the definition of the MSRs on Intel systems please see the SDM
at http://www.intel.com/sdm (Volume 3)

Available trace points:

/sys/kernel/debug/tracing/events/msr/

Trace MSR reads

read_msr

msr: MSR number
val: Value written
failed: 1 if the access failed, otherwise 0


Trace MSR writes

write_msr

msr: MSR number
val: Value written
failed: 1 if the access failed, otherwise 0


Trace RDPMC in kernel

rdpmc

The trace data can be post processed with the postprocess/decode_msr.py script

cat /sys/kernel/debug/tracing/trace | decode_msr.py /usr/src/linux/include/asm/msr-index.h

to add symbolic MSR names.