linux-kernel - Re: [PATCH v1 04/20] perf jevents: Add tsx metric group for Intel models

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Date: Thu, 29 Feb 2024 16:15:51 -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 04/20] perf jevents: Add tsx 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 | 51 ++++++++++++++++++++++++++
>  1 file changed, 51 insertions(+)
> 
> diff --git a/tools/perf/pmu-events/intel_metrics.py b/tools/perf/pmu-events/intel_metrics.py
> index 20c25d142f24..1096accea2aa 100755
> --- a/tools/perf/pmu-events/intel_metrics.py
> +++ b/tools/perf/pmu-events/intel_metrics.py
> @@ -7,6 +7,7 @@ import argparse
>  import json
>  import math
>  import os
> +from typing import Optional
>  
>  parser = argparse.ArgumentParser(description="Intel perf json generator")
>  parser.add_argument("-metricgroups", help="Generate metricgroups data", action='store_true')
> @@ -77,10 +78,60 @@ def Smi() -> MetricGroup:
>      ])
>  
>  
> +def Tsx() -> Optional[MetricGroup]:
> +    if args.model not in [
> +        'alderlake',
> +        'cascadelakex',
> +        'icelake',
> +        'icelakex',
> +        'rocketlake',
> +        'sapphirerapids',
> +        'skylake',
> +        'skylakex',
> +        'tigerlake',> +    ]:

Can we get ride of the model list? Otherwise, we have to keep updating
the list.

> +        return None
> +> +    pmu = "cpu_core" if args.model == "alderlake" else "cpu"

Is it possible to change the check to the existence of the "cpu" PMU
here? has_pmu("cpu") ? "cpu" : "cpu_core"

> +    cycles = Event('cycles')
> +    cycles_in_tx = Event(f'{pmu}/cycles\-t/')
> +    transaction_start = Event(f'{pmu}/tx\-start/')
> +    cycles_in_tx_cp = Event(f'{pmu}/cycles\-ct/')
> +    metrics = [
> +        Metric('tsx_transactional_cycles',
> +                      'Percentage of cycles within a transaction region.',
> +                      Select(cycles_in_tx / cycles, has_event(cycles_in_tx), 0),
> +                      '100%'),
> +        Metric('tsx_aborted_cycles', 'Percentage of cycles in aborted transactions.',
> +                      Select(max(cycles_in_tx - cycles_in_tx_cp, 0) / cycles,
> +                                    has_event(cycles_in_tx),
> +                                    0),
> +                      '100%'),
> +        Metric('tsx_cycles_per_transaction',
> +                      'Number of cycles within a transaction divided by the number of transactions.',
> +                      Select(cycles_in_tx / transaction_start,
> +                                    has_event(cycles_in_tx),
> +                                    0),
> +                      "cycles / transaction"),
> +    ]
> +    if args.model != 'sapphirerapids':

Add the "tsx_cycles_per_elision" metric only if
has_event(f'{pmu}/el\-start/')?

Thanks,
Kan

> +        elision_start = Event(f'{pmu}/el\-start/')
> +        metrics += [
> +            Metric('tsx_cycles_per_elision',
> +                          'Number of cycles within a transaction divided by the number of elisions.',
> +                          Select(cycles_in_tx / elision_start,
> +                                        has_event(elision_start),
> +                                        0),
> +                          "cycles / elision"),
> +        ]
> +    return MetricGroup('transaction', metrics)
> +
> +
>  all_metrics = MetricGroup("", [
>      Idle(),
>      Rapl(),
>      Smi(),
> +    Tsx(),
>  ])
>  
>  if args.metricgroups: