Re: [RFC] Adding Support for Firefox's Gecko Profile Format

[Namhyung Kim]

Hi Anup,

On Wed, Jun 28, 2023 at 1:11 PM Anup Sharma <anupnewsmail@xxxxxxxxx> wrote:
>
> On Wed, Jun 14, 2023 at 01:17:52PM -0700, Ian Rogers wrote:
> > On Wed, Jun 14, 2023 at 1:14 PM Anup Sharma <anupnewsmail@xxxxxxxxx> wrote:
> > >
> > > On Thu, Jun 08, 2023 at 06:23:49PM +0530, Anup Sharma wrote:
> > > I wanted to take a moment to provide you with an update on the progress
> > > of our Firefox Gecko converter work. While I must emphasize that the code
> > > I'm sharing is not the final version, I wanted to share the advancements
> > > I have made thus far.
> > >
> > > This script can generate a JSON format from the output of the "perf script" command.
> > > I attempted to load this JSON file into profile.firefox.com, and although it
> > > successfully loaded, the call tree are not visible. I'm certain this issue
> > > is related to the format of the JSON file or if there is another underlying
> > > cause. I will continue investigating to determine the cause of this problem.
> >
> > Great Anup, progress can be frustrating slow at first but it is a good
> > milestone to be generating output and having firefox profiler consume
> > it. You can open up the JavaScript console for the firefox profiler
> > and it will give some debug output. This should hopefully help you
> > make progress.
>
> This week I tried playing with perf-script-python, the first challenge was
> figuring out how to parse the data coming from the process_events.
> Understanding the structure and extracting the necessary information
> proved to be more complex than anticipated. This required me to spend
> a significant amount of time researching and experimenting with different
> parsing techniques.

I'm not sure what kind of parsing you meant.  IIRC the sample data is
in a dict and all the information should be available there.  Maybe we
missed some new sample data types though.

>
> The second challenge revolved around the usage of event hooks provided with the perf script
> python event handlers. I found myself deliberating between two approaches. The first
> approach involved creating custom functions that would be called using the event
> handlers. These functions would then save the data in an organized format within
> globally created data structures. The alternative approach was to write the entire
> logic inside the event handlers themselves.
>
> Additionally, I contemplated whether it would be more suitable to handle the creation of
> a Gecko format for JSON and the profile format within the same script or to separate
> them into different scripts.
>
> I will discuss this points during tomorrow's office hour.
>
> However, I have gained a deeper understanding of the problem at hand and will use this
> knowledge to make more informed decisions and progress more effectively in the coming weeks.

Sounds like you did a good amount of research on how perf script
works.  We can talk about the details in the meeting.

Thanks,
Namhyung