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

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Date:   Fri, 4 Mar 2022 14:56:36 +0800
From:   Huang Rui <ray.huang@....com>
To:     "Su, Jinzhou (Joe)" <Jinzhou.Su@....com>
Cc:     "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "srinivas.pandruvada@...ux.intel.com" 
        <srinivas.pandruvada@...ux.intel.com>,
        "dsmythies@...us.net" <dsmythies@...us.net>,
        "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
        "todd.e.brandt@...ux.intel.com" <todd.e.brandt@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Sharma, Deepak" <Deepak.Sharma@....com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Du, Xiaojian" <Xiaojian.Du@....com>,
        "Yuan, Perry" <Perry.Yuan@....com>,
        "Meng, Li (Jassmine)" <Li.Meng@....com>
Subject: Re: [PATCH V2 4/4] Documentation: amd-pstate: add tracer tool
 introduction

On Fri, Mar 04, 2022 at 02:07:24PM +0800, Su, Jinzhou (Joe) wrote:
> 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

amd-pstate -> ``amd-pstate``

> +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

amd-pstate -> ``amd-pstate``

> +pstate tracer.
> +
> +Tracer tool located in linux/tools/power/x86/amd_pstate_tracer. It can be

linux/tools/power/x86/amd_pstate_tracer -> ``linux/tools/power/x86/amd_pstate_tracer``

> +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
>