linux-kernel - Re: [PATCH v3 4/6] scripts: python: Add trace end processing and JSON output

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Date:   Thu, 13 Jul 2023 19:31:36 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Anup Sharma <anupnewsmail@...il.com>,
        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>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/6] scripts: python: Add trace end processing and JSON output

Hi Anup and Ian,

On Wed, Jul 12, 2023 at 10:28 AM Ian Rogers <irogers@...gle.com> wrote:
>
> On Mon, Jul 10, 2023 at 4:13 PM Anup Sharma <anupnewsmail@...il.com> wrote:
> >
> > Inside the trace end function the final output will be dumped
> > to standard output in JSON gecko format. Additionally, constants
> > such as USER_CATEGORY_INDEX, KERNEL_CATEGORY_INDEX, CATEGORIES, and
> > PRODUCT are defined to provide contextual information.
> >
> > Signed-off-by: Anup Sharma <anupnewsmail@...il.com>
>
> Acked-by: Ian Rogers <irogers@...gle.com>

I'm ok with this change too but I think it can be squashed to
patch 1/6 as I think it'd make it more self-contained.  Of course
you might change time and thread to have empty values.

>
> > ---
> >  .../scripts/python/firefox-gecko-converter.py | 34 ++++++++++++++++++-
> >  1 file changed, 33 insertions(+), 1 deletion(-)
> >
> > diff --git a/tools/perf/scripts/python/firefox-gecko-converter.py b/tools/perf/scripts/python/firefox-gecko-converter.py
> > index 0b8a86bdcab1..39818a603265 100644
> > --- a/tools/perf/scripts/python/firefox-gecko-converter.py
> > +++ b/tools/perf/scripts/python/firefox-gecko-converter.py
> > @@ -24,8 +24,40 @@ from Core import *
> >  thread_map = {}
> >  start_time = None
> >
> > +# Follow Brendan Gregg's Flamegraph convention: orange for kernel and yellow for user
> > +CATEGORIES = [
> > +    {'name': 'User', 'color': 'yellow', 'subcategories': ['Other']},
> > +    {'name': 'Kernel', 'color': 'orange', 'subcategories': ['Other']}
> > +]
>
> A follow up could be to make these command line options, defaulting to
> orange and yellow.

Sounds good.

>
> > +
> > +# The product name is used by the profiler UI to show the Operating system and Processor.
> > +PRODUCT = os.popen('uname -op').read().strip()

I'm not against this but having a command name (or full
command line) of the target process as a title might be better.
But I'm not sure if the python scripting engine exposed the info
(like in perf report --header-only) to the script.

Thanks,
Namhyung


> > +
> >  def trace_end():
> > -       pass
> > +    thread_array = thread_map.values()))
> > +
> > +    result = {
> > +        'meta': {
> > +            'interval': 1,
> > +            'processType': 0,
> > +            'product': PRODUCT,
> > +            'stackwalk': 1,
> > +            'debug': 0,
> > +            'gcpoison': 0,
> > +            'asyncstack': 1,
> > +            'startTime': start_time,
> > +            'shutdownTime': None,
> > +            'version': 24,
> > +            'presymbolicated': True,
> > +            'categories': CATEGORIES,
> > +            'markerSchema': []
> > +            },
> > +        'libs': [],
> > +        'threads': thread_array,
> > +        'processes': [],
> > +        'pausedRanges': []
> > +    }
> > +    json.dump(result, sys.stdout, indent=2)
> >
> >  def process_event(param_dict):
> >         global start_time
> > --
> > 2.34.1
> >