linux-kernel - Re: [PATCH v4 11/12] perf jevents: Add model list option

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Date:   Thu, 26 Jan 2023 13:44:39 +0000
From:   John Garry <john.g.garry@...cle.com>
To:     Ian Rogers <irogers@...gle.com>, Will Deacon <will@...nel.org>,
        James Clark <james.clark@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Kim Phillips <kim.phillips@....com>,
        Florian Fischer <florian.fischer@...q.space>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Xing Zhengjun <zhengjun.xing@...ux.intel.com>,
        Rob Herring <robh@...nel.org>,
        Kang Minchul <tegongkang@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sandipan Das <sandipan.das@....com>,
        Jing Zhang <renyu.zj@...ux.alibaba.com>,
        linuxppc-dev@...ts.ozlabs.org, Kajol Jain <kjain@...ux.ibm.com>
Cc:     Stephane Eranian <eranian@...gle.com>,
        Perry Taylor <perry.taylor@...el.com>,
        Caleb Biggers <caleb.biggers@...el.com>
Subject: Re: [PATCH v4 11/12] perf jevents: Add model list option

On 26/01/2023 01:18, Ian Rogers wrote:
> This allows the set of generated jevents events and metrics be limited
> to a subset of the model names. Appropriate if trying to minimize the
> binary size where only a set of models are possible.
> 
> Signed-off-by: Ian Rogers <irogers@...gle.com>

Thanks for this:

Reviewed-by: John Garry <john.g.garry@...cle.com>

> ---
>   tools/perf/pmu-events/Build      |  3 ++-
>   tools/perf/pmu-events/jevents.py | 14 ++++++++++++++
>   2 files changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/pmu-events/Build b/tools/perf/pmu-events/Build
> index 15b9e8fdbffa..a14de24ecb69 100644
> --- a/tools/perf/pmu-events/Build
> +++ b/tools/perf/pmu-events/Build
> @@ -10,6 +10,7 @@ JEVENTS_PY	=  pmu-events/jevents.py
>   ifeq ($(JEVENTS_ARCH),)
>   JEVENTS_ARCH=$(SRCARCH)
>   endif
> +JEVENTS_MODEL ?= all
>   
>   #
>   # Locate/process JSON files in pmu-events/arch/
> @@ -23,5 +24,5 @@ $(OUTPUT)pmu-events/pmu-events.c: pmu-events/empty-pmu-events.c
>   else
>   $(OUTPUT)pmu-events/pmu-events.c: $(JSON) $(JSON_TEST) $(JEVENTS_PY) pmu-events/metric.py
>   	$(call rule_mkdir)
> -	$(Q)$(call echo-cmd,gen)$(PYTHON) $(JEVENTS_PY) $(JEVENTS_ARCH) pmu-events/arch $@
> +	$(Q)$(call echo-cmd,gen)$(PYTHON) $(JEVENTS_PY) $(JEVENTS_ARCH) $(JEVENTS_MODEL) pmu-events/arch $@
>   endif
> diff --git a/tools/perf/pmu-events/jevents.py b/tools/perf/pmu-events/jevents.py
> index 627ee817f57f..2bcd07ce609f 100755
> --- a/tools/perf/pmu-events/jevents.py
> +++ b/tools/perf/pmu-events/jevents.py
> @@ -599,6 +599,8 @@ const struct pmu_events_map pmu_events_map[] = {
>               else:
>                 metric_tblname = 'NULL'
>                 metric_size = '0'
> +            if event_size == '0' and metric_size == '0':
> +              continue
>               cpuid = row[0].replace('\\', '\\\\')
>               _args.output_file.write(f"""{{
>   \t.arch = "{arch}",
> @@ -888,12 +890,24 @@ def main() -> None:
>             action: Callable[[Sequence[str], os.DirEntry], None]) -> None:
>       """Replicate the directory/file walking behavior of C's file tree walk."""
>       for item in os.scandir(path):
> +      if _args.model != 'all' and item.is_dir():
> +        # Check if the model matches one in _args.model.
> +        if len(parents) == _args.model.split(',')[0].count('/'):
> +          # We're testing the correct directory.
> +          item_path = '/'.join(parents) + ('/' if len(parents) > 0 else '') + item.name
> +          if 'test' not in item_path and item_path not in _args.model.split(','):
> +            continue
>         action(parents, item)
>         if item.is_dir():
>           ftw(item.path, parents + [item.name], action)
>   
>     ap = argparse.ArgumentParser()
>     ap.add_argument('arch', help='Architecture name like x86')
> +  ap.add_argument('model', help='''Select a model such as skylake to
> +reduce the code size.  Normally set to "all". For architectures like
> +ARM64 with an implementor/model, the model must include the implementor

mega-nit: /s/ARM64/arm64/

it just makes grepping easier (without -i, of course)

> +such as "arm/cortex-a34".''',
> +                  default='all')
>     ap.add_argument(
>         'starting_dir',
>         type=dir_path,