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Documentation: amd-pstate: add tracer tool introduction

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Add amd pstate tracer tool introduction

Signed-off-by: Jinzhou Su <Jinzhou.Su@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Jinzhou Su 2022-03-09 09:23:51 +08:00 committed by Rafael J. Wysocki
parent 5e32adccea
commit b020771a66
1 changed files with 26 additions and 0 deletions
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Documentation/admin-guide/pm/amd-pstate.rst
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@ -369,6 +369,32 @@ governor (for the policies it is attached to), or by the ``CPUFreq`` core (for t
policies with other scaling governors).
Tracer Tool
-------------
``amd_pstate_tracer.py`` can record and parse ``amd-pstate`` trace log, then
generate performance plots. This utility can be used to debug and tune the
performance of ``amd-pstate`` driver. The tracer tool needs to import intel
pstate tracer.
Tracer tool located in ``linux/tools/power/x86/amd_pstate_tracer``. It can be
used in two ways. If trace file is available, then directly parse the file
with command ::
./amd_pstate_trace.py [-c cpus] -t <trace_file> -n <test_name>
Or generate trace file with root privilege, then parse and plot with command ::
sudo ./amd_pstate_trace.py [-c cpus] -n <test_name> -i <interval> [-m kbytes]
The test result can be found in ``results/test_name``. Following is the example
about part of the output. ::
common_cpu common_secs common_usecs min_perf des_perf max_perf freq mperf apef tsc load duration_ms sample_num elapsed_time common_comm
CPU_005 712 116384 39 49 166 0.7565 9645075 2214891 38431470 25.1 11.646 469 2.496 kworker/5:0-40
CPU_006 712 116408 39 49 166 0.6769 8950227 1839034 37192089 24.06 11.272 470 2.496 kworker/6:0-1264
Reference
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