1 ================ 1 ================
2 MSR Trace Events 2 MSR Trace Events
3 ================ 3 ================
4 4
5 The x86 kernel supports tracing most MSR (Mode 5 The x86 kernel supports tracing most MSR (Model Specific Register) accesses.
6 To see the definition of the MSRs on Intel sys 6 To see the definition of the MSRs on Intel systems please see the SDM
7 at https://www.intel.com/sdm (Volume 3) 7 at https://www.intel.com/sdm (Volume 3)
8 8
9 Available trace points: 9 Available trace points:
10 10
11 /sys/kernel/tracing/events/msr/ 11 /sys/kernel/tracing/events/msr/
12 12
13 Trace MSR reads: 13 Trace MSR reads:
14 14
15 read_msr 15 read_msr
16 16
17 - msr: MSR number 17 - msr: MSR number
18 - val: Value written 18 - val: Value written
19 - failed: 1 if the access failed, otherwise 19 - failed: 1 if the access failed, otherwise 0
20 20
21 21
22 Trace MSR writes: 22 Trace MSR writes:
23 23
24 write_msr 24 write_msr
25 25
26 - msr: MSR number 26 - msr: MSR number
27 - val: Value written 27 - val: Value written
28 - failed: 1 if the access failed, otherwise 28 - failed: 1 if the access failed, otherwise 0
29 29
30 30
31 Trace RDPMC in kernel: 31 Trace RDPMC in kernel:
32 32
33 rdpmc 33 rdpmc
34 34
35 The trace data can be post processed with the 35 The trace data can be post processed with the postprocess/decode_msr.py script::
36 36
37 cat /sys/kernel/tracing/trace | decode_msr.p 37 cat /sys/kernel/tracing/trace | decode_msr.py /usr/src/linux/include/asm/msr-index.h
38 38
39 to add symbolic MSR names. 39 to add symbolic MSR names.
40 40
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