events-msr.rst

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 2MSR Trace Events
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 4
 5The x86 kernel supports tracing most MSR (Model Specific Register) accesses.
 6To see the definition of the MSRs on Intel systems please see the SDM
 7at https://www.intel.com/sdm (Volume 3)
 8
 9Available trace points:
10
11/sys/kernel/tracing/events/msr/
12
13Trace MSR reads:
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15read_msr
16
17  - msr: MSR number
18  - val: Value written
19  - failed: 1 if the access failed, otherwise 0
20
21
22Trace MSR writes:
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24write_msr
25
26  - msr: MSR number
27  - val: Value written
28  - failed: 1 if the access failed, otherwise 0
29
30
31Trace RDPMC in kernel:
32
33rdpmc
34
35The trace data can be post processed with the postprocess/decode_msr.py script::
36
37  cat /sys/kernel/tracing/trace | decode_msr.py /usr/src/linux/include/asm/msr-index.h
38
39to add symbolic MSR names.
40