linux-kernel - Re: [PATCH v4 02/22] perf jevents: Add idle metric for Intel models

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Message-ID: <365e34e3-929e-4b28-b0f2-ddcbaa09294a@linux.intel.com>
Date: Wed, 6 Nov 2024 12:08:56 -0500
From: "Liang, Kan" <kan.liang@...ux.intel.com>
To: Ian Rogers <irogers@...gle.com>, Peter Zijlstra <peterz@...radead.org>,
 Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>,
 Namhyung Kim <namhyung@...nel.org>, Mark Rutland <mark.rutland@....com>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>,
 linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
 Perry Taylor <perry.taylor@...el.com>, Samantha Alt
 <samantha.alt@...el.com>, Caleb Biggers <caleb.biggers@...el.com>,
 Weilin Wang <weilin.wang@...el.com>, Edward Baker <edward.baker@...el.com>
Subject: Re: [PATCH v4 02/22] perf jevents: Add idle metric for Intel models



On 2024-11-06 12:01 p.m., Liang, Kan wrote:
> 
> 
> On 2024-09-26 1:50 p.m., Ian Rogers wrote:
>> Compute using the msr PMU the percentage of wallclock cycles where the
>> CPUs are in a low power state.
>>
>> Signed-off-by: Ian Rogers <irogers@...gle.com>
>> ---
>>  tools/perf/pmu-events/intel_metrics.py | 16 ++++++++++++++--
>>  1 file changed, 14 insertions(+), 2 deletions(-)
>>
>> diff --git a/tools/perf/pmu-events/intel_metrics.py b/tools/perf/pmu-events/intel_metrics.py
>> index 58e23eb48312..f875eb844c78 100755
>> --- a/tools/perf/pmu-events/intel_metrics.py
>> +++ b/tools/perf/pmu-events/intel_metrics.py
>> @@ -1,7 +1,8 @@
>>  #!/usr/bin/env python3
>>  # SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
>> -from metric import (d_ratio, has_event, Event, JsonEncodeMetric, JsonEncodeMetricGroupDescriptions,
>> -                    LoadEvents, Metric, MetricGroup, Select)
>> +from metric import (d_ratio, has_event, max, Event, JsonEncodeMetric,
>> +                    JsonEncodeMetricGroupDescriptions, LoadEvents, Metric,
>> +                    MetricGroup, Select)
>>  import argparse
>>  import json
>>  import math
>> @@ -11,6 +12,16 @@ import os
>>  _args = None
>>  interval_sec = Event("duration_time")
>>  
>> +def Idle() -> Metric:
>> +  cyc = Event("msr/mperf/")
>> +  tsc = Event("msr/tsc/")
>> +  low = max(tsc - cyc, 0)
>> +  return Metric(
>> +      "idle",
>> +      "Percentage of total wallclock cycles where CPUs are in low power state (C1 or deeper sleep state)",
>> +      d_ratio(low, tsc), "100%")
> 

The mperf and aperf can be enumerated. It's better to check it before
using it, has_event(mperf).

Thanks,
Kan

> I'm not sure if the metrics is correct, especially considering the mperf
> is a R/W register. If someone clear the mperf, the restuls must be wrong.
> 
> Thanks,
> Kan
> 
>> +
>> +
>>  def Rapl() -> MetricGroup:
>>    """Processor power consumption estimate.
>>  
>> @@ -68,6 +79,7 @@ def main() -> None:
>>    LoadEvents(directory)
>>  
>>    all_metrics = MetricGroup("", [
>> +      Idle(),
>>        Rapl(),
>>    ])
>>  
> 
>