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@google.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(),
>> ])
>>
>
>