| 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. | |