linux-kernel - Re: [PATCH v2 2/7] scripts: python: Introduce thread sample processing to create thread

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Date:   Tue, 11 Jul 2023 03:21:19 +0530
From:   Anup Sharma <anupnewsmail@...il.com>
To:     Namhyung Kim <namhyung@...nel.org>
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>, Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/7] scripts: python: Introduce thread sample
 processing to create thread

On Wed, Jul 05, 2023 at 10:42:47PM -0700, Namhyung Kim wrote:
> On Wed, Jul 5, 2023 at 12:44 PM Anup Sharma <anupnewsmail@...il.com> wrote:
> >
> > The _addThreadSample function is responsible for adding a sample to a specific
> > thread. It first checks if the thread exists in the thread_map dictionary.
> > If not, it creates a new thread using the _createtread function and assigns
> > it to the thread_map. Finally, it calls the 'addSample' method of the thread,
> > passing the thread name, stack, and timestamp.
> >
> > Signed-off-by: Anup Sharma <anupnewsmail@...il.com>
> > ---
> >  .../perf/scripts/python/firefox-gecko-converter.py  | 13 +++++++++++++
> >  1 file changed, 13 insertions(+)
> >
> > diff --git a/tools/perf/scripts/python/firefox-gecko-converter.py b/tools/perf/scripts/python/firefox-gecko-converter.py
> > index ce663840d212..95b061a97cbc 100644
> > --- a/tools/perf/scripts/python/firefox-gecko-converter.py
> > +++ b/tools/perf/scripts/python/firefox-gecko-converter.py
> > @@ -18,7 +18,20 @@ sys.path.append(os.environ['PERF_EXEC_PATH'] + \
> >  from perf_trace_context import *
> >  from Core import *
> >
> > +thread_map = {}
> > +start_time = None
> > +
> >  def process_event(param_dict):
> > +       global start_time
> > +       global thread_map
> > +
> > +       def _addThreadSample(pid, tid, threadName, time_stamp, stack):
> > +               thread = thread_map.get(tid)
> > +               if not thread:
> > +                       thread = _createtread(threadName, pid, tid)
> 
> Shouldn't it be '_createThread'?

Yes, it should be '_createThread'. I will fix it in the next version.

> > +                       thread_map[tid] = thread
> > +               thread['addSample'](threadName, stack, time_stamp)
> 
> Why is it like this?  What do you intend with the thread['addSample']
> method?  Can it be simpler like a direct function call?

The purpose of the addSample function is to append stack frames to the
samples['data'] collection. While it could be implemented as a standalone
function, doing so would increase complexity due to shared properties
among threads such as pid, tid, and threadName. Although a decorator
could potentially address this, it would likely result in code that
is functionally and structurally similar. Alternatively, if addSample
were implemented as a separate function, the shared elements would need
to be repeatedly passed to the function.

> And more importantly, you'd better make each patch work properly.
> AFAICS it won't do the job because both _createtread() and
> thread['addSample'] are not implemented yet.
>
> You can either move those definitions to this commit or have the
> commit implementing them before this one.

Thanks, Preparing commit in series is new to me. I will try to fix
it in the next version.

> Thanks,
> Namhyung
> 
> 
> > +
> >         time_stamp = (param_dict['sample']['time'] // 1000) / 1000
> >         pid = param_dict['sample']['pid']
> >         tid = param_dict['sample']['tid']
> > --
> > 2.34.1
> >