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MSR Trace Events
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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
https://www.intel.com/sdm (Volume 3)
Available trace points:
/sys/kernel/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/tracing/trace | decode_msr.py /usr/src/linux/include/asm/msr-index.h
to add symbolic MSR names.
