linux-kernel - Re: [PATCH v3 5/6] scripts: python: Implement add sample function and return finish

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Date:   Wed, 12 Jul 2023 10:35:16 -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 5/6] scripts: python: Implement add sample function and
 return finish

On Mon, Jul 10, 2023 at 4:14 PM Anup Sharma <anupnewsmail@...il.com> wrote:
>
> The addSample function appends a new entry to the 'samples' data structure.
>
> The finish function generates a dictionary containing various profile
> information such as 'tid', 'pid', 'name', 'markers', 'samples',
> 'frameTable', 'stackTable', 'stringTable', 'registerTime',
> 'unregisterTime', and 'processType'.
>
> Signed-off-by: Anup Sharma <anupnewsmail@...il.com>
> ---
>  .../scripts/python/firefox-gecko-converter.py | 25 +++++++++++++++++++
>  1 file changed, 25 insertions(+)
>
> diff --git a/tools/perf/scripts/python/firefox-gecko-converter.py b/tools/perf/scripts/python/firefox-gecko-converter.py
> index 39818a603265..6c934de1f608 100644
> --- a/tools/perf/scripts/python/firefox-gecko-converter.py
> +++ b/tools/perf/scripts/python/firefox-gecko-converter.py
> @@ -106,11 +106,36 @@ def process_event(param_dict):
>                 }
>                 stringTable = []
>
> +               def addSample(threadName, stackArray, time):

I think these aren't following general naming conventions:
https://peps.python.org/pep-0008/#function-and-variable-names
So use thread_name, stack_array.

> +                       responsiveness = 0
> +                       samples['data'].append([stack, time, responsiveness])
> +
> +               def finish():
> +                       return {
> +                               "tid": tid,
> +                               "pid": pid,
> +                               "name": name,
> +                               "markers": markers,
> +                               "samples": samples,
> +                               "frameTable": frameTable,
> +                               "stackTable": stackTable,
> +                               "stringTable": stringTable,
> +                               "registerTime": 0,
> +                               "unregisterTime": None,
> +                               "processType": 'default'
> +                       }
> +
> +               return {
> +                       "addSample": addSample,
> +                       "finish": finish
> +               }

I think the use of a dictionary here isn't idiomatic. Rather than use
a dictionary I think you can make a class Thread, then have functions
passed self called addSample and finish. So:

class Thread:
  def addSample(self, thread_name: str, stack_array: list[...], time: int):
     responsiveness = 0
     self.samples['data'] ...
...
thread.addSample(threadName, stack, time_stamp)

Should samples be its own class here?

Thanks,
Ian

> +
>         def _addThreadSample(pid, tid, threadName, time_stamp, stack):
>                 thread = thread_map.get(tid)
>                 if not thread:
>                         thread = _createThread(threadName, pid, tid)
>                         thread_map[tid] = thread
> +               thread['addSample'](threadName, stack, time_stamp)
>
>         # Extract relevant information from the event parameters. The event parameters
>         # are in a dictionary:
> --
> 2.34.1
>