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

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Date:   Mon, 17 Jul 2023 21:29:07 +0530
From:   Anup Sharma <anupnewsmail@...il.com>
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>,
        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 Wed, Jul 12, 2023 at 10:35:16AM -0700, Ian Rogers wrote:
> 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.

Noted. Will fix in v4.

> > +                       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:

agreed.

> 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?

I have changed the code to use object oriented approach by taking
reference from simpleperf. I will make class Thread and Sample.

> 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
> >