linux-kernel - [PATCH V2 4/4] Documentation: amd-pstate: add tracer tool introduction

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Date:   Fri, 4 Mar 2022 14:07:24 +0800
From:   Jinzhou Su <Jinzhou.Su@....com>
To:     <rjw@...ysocki.net>, <linux-pm@...r.kernel.org>,
        <srinivas.pandruvada@...ux.intel.com>, <dsmythies@...us.net>
CC:     <ray.huang@....com>, <viresh.kumar@...aro.org>,
        <todd.e.brandt@...ux.intel.com>, <linux-kernel@...r.kernel.org>,
        <deepak.sharma@....com>, <alexander.deucher@....com>,
        <xiaojian.du@....com>, <perry.yuan@....com>, <li.meng@....com>,
        <jinzhou.su@....com>, Jinzhou Su <Jinzhou.Su@....com>
Subject: [PATCH V2 4/4] Documentation: amd-pstate: add tracer tool introduction

Add amd pstate tracer tool introduction

Signed-off-by: Jinzhou Su <Jinzhou.Su@....com>
---
 Documentation/admin-guide/pm/amd-pstate.rst | 26 +++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst
index 2f066df4ee9c..17dd7396e8fc 100644
--- a/Documentation/admin-guide/pm/amd-pstate.rst
+++ b/Documentation/admin-guide/pm/amd-pstate.rst
@@ -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 the 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
 ===========
 
-- 
2.27.0