linux-kernel - Re: [PATCH v3 2/6] scripts: python: Extact necessary information from process event

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Date:   Wed, 12 Jul 2023 10:01:09 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Anup Sharma <anupnewsmail@...il.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>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/6] scripts: python: Extact necessary information from
 process event

On Mon, Jul 10, 2023 at 4:10 PM Anup Sharma <anupnewsmail@...il.com> wrote:
>
> The script takes in a sample event dictionary(param_dict) and retrieves
> relevant data such as time stamp, PID, TID, thread name. Also start time
> is defined.
>
> Signed-off-by: Anup Sharma <anupnewsmail@...il.com>
> ---
>  .../perf/scripts/python/firefox-gecko-converter.py  | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/scripts/python/firefox-gecko-converter.py b/tools/perf/scripts/python/firefox-gecko-converter.py
> index 5b342641925c..765f1775cee5 100644
> --- a/tools/perf/scripts/python/firefox-gecko-converter.py
> +++ b/tools/perf/scripts/python/firefox-gecko-converter.py
> @@ -21,8 +21,19 @@ sys.path.append(os.environ['PERF_EXEC_PATH'] + \
>  from perf_trace_context import *
>  from Core import *
>

It'd be nice to have a comment here, perhaps:
# The time stamp from the first of the time ordered events.

> +start_time = None
> +
>  def trace_end():
>         pass
>
>  def process_event(param_dict):
> -       pass
> +       global start_time
> +       # Extract relevant information from the event parameters. The event parameters
> +       # are in a dictionary:
> +       time_stamp = (param_dict['sample']['time'] // 1000) / 1000
> +       pid = param_dict['sample']['pid']
> +       tid = param_dict['sample']['tid']
> +       thread_name = param_dict['comm']
> +
> +       # Assume that start time is the time of the first event.
> +       start_time = time_stamp if not start_time else start_time

I appreciate that this is one line, but it takes some getting your
head around that start_time is being assigned to itself in the common
case. I think this would be more readable as:

if not start_time:
  start_time = time_stamp

Thanks,
Ian

> --
> 2.34.1
>