linux-kernel - Re: [PATCH v4 03/22] perf jevents: Add smi metric group for Intel models

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Message-ID: <5d13b06f-408a-4a12-825a-67ee87b5decd@linux.intel.com>
Date: Wed, 6 Nov 2024 13:29:28 -0500
From: "Liang, Kan" <kan.liang@...ux.intel.com>
To: Ian Rogers <irogers@...gle.com>
Cc: 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 03/22] perf jevents: Add smi metric group for Intel
 models



On 2024-11-06 12:42 p.m., Ian Rogers wrote:
> On Wed, Nov 6, 2024 at 9:32 AM Liang, Kan <kan.liang@...ux.intel.com> wrote:
>>
>>
>>
>> On 2024-09-26 1:50 p.m., Ian Rogers wrote:
>>> Allow duplicated metric to be dropped from json files.
>>>
>>> Signed-off-by: Ian Rogers <irogers@...gle.com>
>>> ---
>>>  tools/perf/pmu-events/intel_metrics.py | 21 ++++++++++++++++++++-
>>>  1 file changed, 20 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/tools/perf/pmu-events/intel_metrics.py b/tools/perf/pmu-events/intel_metrics.py
>>> index f875eb844c78..f34b4230a4ee 100755
>>> --- a/tools/perf/pmu-events/intel_metrics.py
>>> +++ b/tools/perf/pmu-events/intel_metrics.py
>>> @@ -2,7 +2,7 @@
>>>  # SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
>>>  from metric import (d_ratio, has_event, max, Event, JsonEncodeMetric,
>>>                      JsonEncodeMetricGroupDescriptions, LoadEvents, Metric,
>>> -                    MetricGroup, Select)
>>> +                    MetricGroup, MetricRef, Select)
>>>  import argparse
>>>  import json
>>>  import math
>>> @@ -56,6 +56,24 @@ def Rapl() -> MetricGroup:
>>>                       description="Running Average Power Limit (RAPL) power consumption estimates")
>>>
>>>
>>> +def Smi() -> MetricGroup:
>>> +    aperf = Event('msr/aperf/')
>>> +    cycles = Event('cycles')
>>> +    smi_num = Event('msr/smi/')
>>> +    smi_cycles = Select(Select((aperf - cycles) / aperf, smi_num > 0, 0),
>>> +                        has_event(aperf),
>>> +                        0)
>>> +    return MetricGroup('smi', [
>>> +        Metric('smi_num', 'Number of SMI interrupts.',
>>> +               Select(smi_num, has_event(smi_num), 0), 'SMI#'),
>>> +        # Note, the smi_cycles "Event" is really a reference to the metric.
>>> +        Metric('smi_cycles',
>>> +               'Percentage of cycles spent in System Management Interrupts. '
>>> +               'Requires /sys/devices/cpu/freeze_on_smi to be 1.',
>>
>> It seems not work for hybrid?
> 
> Thanks. The code is a migration of existing metrics that exist for hybrid:
> https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git/tree/tools/perf/pmu-events/arch/x86/alderlake/adl-metrics.json?h=perf-tools-next#n74
> I still lack an easy way to test on hybrid, but I think fixing that
> case can be follow on work.

The metrics itself works on hybrid. But the description doesn't.
For hybrid, the location of the knob should be
/sys/devices/cpu_atom/freeze_on_smi
and
/sys/devices/cpu_core/freeze_on_smi

Maybe changes it as below?
'Requires /sys/devices/cpu*/freeze_on_smi to be 1.'

Thanks,
Kan