linux-kernel - Re: [PATCH v2 5/7] scripts: python: implement get or create frame function

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Date:   Wed, 5 Jul 2023 23:06:58 -0700
From:   Namhyung Kim <namhyung@...nel.org>
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>, 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 5/7] scripts: python: implement get or create frame function

On Wed, Jul 5, 2023 at 12:48 PM Anup Sharma <anupnewsmail@...il.com> wrote:
>
> The get_or_create_frame function is responsible for retrieving or
> creating a frame based on the provided frameString. If the frame
> corresponding to the frameString is found in the frameMap, it is
> returned. Otherwise, a new frame is created by appending relevant
> information to the frameTable's 'data' array and adding the
> frameString to the stringTable.
>
> The index of the newly created frame is added to the frameMap.
>
> Signed-off-by: Anup Sharma <anupnewsmail@...il.com>
> ---
>  .../scripts/python/firefox-gecko-converter.py | 33 +++++++++++++++++++
>  1 file changed, 33 insertions(+)
>
> diff --git a/tools/perf/scripts/python/firefox-gecko-converter.py b/tools/perf/scripts/python/firefox-gecko-converter.py
> index 6f69c083d3ff..d5b9fb16e520 100644
> --- a/tools/perf/scripts/python/firefox-gecko-converter.py
> +++ b/tools/perf/scripts/python/firefox-gecko-converter.py
> @@ -77,6 +77,39 @@ def process_event(param_dict):
>                                 stackMap[key] = stack
>                         return stack
>
> +               frameMap = dict()
> +               def get_or_create_frame(frameString):
> +                       frame = frameMap.get(frameString)
> +                       if frame is None:
> +                               frame = len(frameTable['data'])
> +                               location = len(stringTable)
> +                               stringTable.append(frameString)

Looks like it just always appending a new string.
Any deduplication work later?

> +                               category = KERNEL_CATEGORY_INDEX if frameString.find('kallsyms') != -1 \
> +                                               or frameString.find('/vmlinux') != -1 \
> +                                               or frameString.endswith('.ko)') \
> +                                               else USER_CATEGORY_INDEX

I think you can use param_dict['sample']['cpumode'].
Please see include/uapi/linux/perf_event.h for cpumode
values.

> +                               implementation = None
> +                               optimizations = None
> +                               line = None
> +                               relevantForJS = False
> +                               subcategory = None
> +                               innerWindowID = 0
> +                               column = None
> +
> +                               frameTable['data'].append([
> +                                       location,
> +                                       relevantForJS,
> +                                       innerWindowID,
> +                                       implementation,
> +                                       optimizations,
> +                                       line,
> +                                       column,
> +                                       category,
> +                                       subcategory,
> +                               ])
> +                               frameMap[frameString] = frame

I think it'd be better if you define the frameTable in this
commit.

Thanks,
Namhyung


> +                       return frame
> +
>         def _addThreadSample(pid, tid, threadName, time_stamp, stack):
>                 thread = thread_map.get(tid)
>                 if not thread:
> --
> 2.34.1
>