linux-kernel - Re: [PATCH v4 2/3] perf stat: Add JSON output option

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Date:   Tue, 31 May 2022 16:18:26 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Namhyung Kim <namhyung@...nel.org>
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>,
        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 <linux-kernel@...r.kernel.org>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        Claire Jensen <clairej735@...il.com>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v4 2/3] perf stat: Add JSON output option

On Tue, May 31, 2022 at 4:13 PM Ian Rogers <irogers@...gle.com> wrote:
>
> On Tue, May 31, 2022 at 3:46 PM Namhyung Kim <namhyung@...nel.org> wrote:
> >
> > Hi Ian,
> >
> > On Tue, May 24, 2022 at 10:38 PM Ian Rogers <irogers@...gle.com> wrote:
> > >
> > > From: Claire Jensen <cjense@...gle.com>
> > >
> > > CSV output is tricky to format and column layout changes are susceptible
> > > to breaking parsers. New JSON-formatted output has variable names to
> > > identify fields that are consistent and informative, making
> > > the output parseable.
> > >
> > > CSV output example:
> > >
> > > 1.20,msec,task-clock:u,1204272,100.00,0.697,CPUs utilized
> > > 0,,context-switches:u,1204272,100.00,0.000,/sec
> > > 0,,cpu-migrations:u,1204272,100.00,0.000,/sec
> > > 70,,page-faults:u,1204272,100.00,58.126,K/sec
> > >
> > > JSON output example:
> > >
> > > {"counter-value" : "3805.723968", "unit" : "msec", "event" :
> > > "cpu-clock", "event-runtime" : 3805731510100.00, "pcnt-running"
> > > : 100.00, "metric-value" : 4.007571, "metric-unit" : "CPUs utilized"}
> > > {"counter-value" : "6166.000000", "unit" : "", "event" :
> > > "context-switches", "event-runtime" : 3805723045100.00, "pcnt-running"
> > > : 100.00, "metric-value" : 1.620191, "metric-unit" : "K/sec"}
> > > {"counter-value" : "466.000000", "unit" : "", "event" :
> > > "cpu-migrations", "event-runtime" : 3805727613100.00, "pcnt-running"
> > > : 100.00, "metric-value" : 122.447136, "metric-unit" : "/sec"}
> > > {"counter-value" : "208.000000", "unit" : "", "event" :
> > > "page-faults", "event-runtime" : 3805726799100.00, "pcnt-running"
> > > : 100.00, "metric-value" : 54.654516, "metric-unit" : "/sec"}
> > >
> > > Also added documentation for JSON option.
> > > There is some tidy up of CSV code including a potential memory over run
> > > in the os.nfields set up. To facilitate this an AGGR_MAX value is added.
> > >
> > > Signed-off-by: Claire Jensen <cjense@...gle.com>
> >
> > Your sign-off as well?
>
> Doh:
> Signed-off-by: Ian Rogers <irogers@...gle.com>
>
> Thanks,
> Ian

Actually, this was fixed in V5:
https://lore.kernel.org/lkml/20220526224515.4088240-1-irogers@google.com/

Thanks,
Ian

> > Anyway, I think there are places to clean up this part of code
> > more but that's not a part of the work.  Maybe I need to find
> > some time to do that later.
> >
> > Acked-by: Namhyung Kim <namhyung@...nel.org>
> >
> > Thanks,
> > Namhyung