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. | |