linux-kernel - Re: [PATCH v6 2/2] perf test: Json format checking

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Date:   Fri, 8 Jul 2022 08:39:11 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Thomas Richter <tmricht@...ux.ibm.com>
Cc:     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>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        Sandipan Das <sandipan.das@....com>,
        Claire Jensen <cjense@...gle.com>, Alyssa Ross <hi@...ssa.is>,
        Like Xu <likexu@...cent.com>,
        James Clark <james.clark@....com>,
        Florian Fischer <florian.fischer@...q.space>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Claire Jensen <clairej735@...il.com>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v6 2/2] perf test: Json format checking

On Fri, Jul 8, 2022 at 1:31 AM Thomas Richter <tmricht@...ux.ibm.com> wrote:
>
> On 7/7/22 22:12, Ian Rogers wrote:
> > From: Claire Jensen <cjense@...gle.com>
> >
> > Add field checking tests for perf stat JSON output.
> > Sanity checks the expected number of fields are present, that the
> > expected keys are present and they have the correct values.
> >
> > Signed-off-by: Claire Jensen <cjense@...gle.com>
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
> > ---
> >  .../tests/shell/lib/perf_json_output_lint.py  |  95 +++++++++++
> >  tools/perf/tests/shell/stat+json_output.sh    | 147 ++++++++++++++++++
> >  2 files changed, 242 insertions(+)
> >  create mode 100644 tools/perf/tests/shell/lib/perf_json_output_lint.py
> >  create mode 100755 tools/perf/tests/shell/stat+json_output.sh
> >
> ....
> I wonder if it is really necessary to have a python file to post process the
> perf stat output?
>
> With
> commit 7473ee56dbc9 ("perf test: Add checking for perf stat CSV output.")
> the same approach was done which led to issues on s390 and required an additional
> patch to fix this:
> commit ec906102e5b7 ("perf test: Fix "perf stat CSV output linter" test on s390").
>
> I wonder if you can do the perf stat output checking using bash/linux tools as it
> was done in commit ec906102e5b7. This would make maintenance much easier.
>
> Just me 2 cents...

Hi Thomas,

In this case using python avoids writing a JSON decoder, which would
be harder to do in bash although there is perhaps a linter or some
such we could use. That'd wind up being another dependency :-/

Thanks,
Ian

> --
> Thomas Richter, Dept 3303, IBM s390 Linux Development, Boeblingen, Germany
> --
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