linux-kernel - Re: [PATCH v1 03/20] perf jevents: Add smi metric group for Intel models

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Date: Thu, 29 Feb 2024 16:09:00 -0500
From: "Liang, Kan" <kan.liang@...ux.intel.com>
To: Ian Rogers <irogers@...gle.com>, 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>,
 Andi Kleen <ak@...ux.intel.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>,
 John Garry <john.g.garry@...cle.com>, Jing Zhang
 <renyu.zj@...ux.alibaba.com>, Thomas Richter <tmricht@...ux.ibm.com>,
 James Clark <james.clark@....com>, linux-kernel@...r.kernel.org,
 linux-perf-users@...r.kernel.org, Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v1 03/20] perf jevents: Add smi metric group for Intel
 models



On 2024-02-28 7:17 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 | 18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/pmu-events/intel_metrics.py b/tools/perf/pmu-events/intel_metrics.py
> index 46866a25b166..20c25d142f24 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
> @@ -62,9 +62,25 @@ def Rapl() -> MetricGroup:
>                       description="Processor socket power consumption estimates")
>  
>  
> +def Smi() -> MetricGroup:
> +    aperf = Event('msr/aperf/')

There are CPUID enumeration for the aperf and mperf. I believe they
should be always available for a newer bare metal. But they may not be
enumerated in an virtualization env. Should we add a has_event() check
before using it?

Thanks,
Kan

> +    cycles = Event('cycles')
> +    smi_num = Event('msr/smi/')
> +    smi_cycles = Select((aperf - cycles) / aperf, smi_num > 0, 0)
> +    return MetricGroup('smi', [
> +        Metric('smi_num', 'Number of SMI interrupts.',
> +               smi_num, 'SMI#'),
> +        # Note, the smi_cycles "Event" is really a reference to the metric.
> +        Metric('smi_cycles',
> +               'Percentage of cycles spent in System Management Interrupts.',
> +               smi_cycles, '100%', threshold=(MetricRef('smi_cycles') > 0.10))
> +    ])
> +
> +
>  all_metrics = MetricGroup("", [
>      Idle(),
>      Rapl(),
> +    Smi(),
>  ])
>  
>  if args.metricgroups: