1687857 - Implement the JavaScript Self-Profiling API

Status: RESOLVED DUPLICATE of bug 1393617

(Core :: Performance, enhancement)

Description

[Louis Lazaris]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0

Steps to reproduce:

Tried to use the self-profiling API according to https://wicg.github.io/js-self-profiling/.

Actual results:

Not supported in Firefox.

Expected results:

It should be supported, likely for now behind a flag.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.

Comment 2

[Gerald Squelart (he/him) (not at Mozilla since 2022-09-15)]

Note that it's a draft, so it's probably not implemented in many places.

This is interesting, at a quick glance it looks like it could control the Gecko Profiler, and our profile data could be converted to the proposal's data structures.

I'm leaving this bug in this component, Julien please forward elsewhere if you can think of a better home. Happy to discuss implementation details with whoever gets to implement it (if not me!)

Comment 3

[Julien Wajsberg [:julienw]]

I think this is more a DOM thing (of course interacting with our team if we want to do it).

Hey Anne, is that on your radar? Do we have a position on this already?

Comment 4

[Anne (:annevk)]

I have looked at this a bit, see https://github.com/mozilla/standards-positions/issues/477 (and issues directly against the proposal's repository). Your input would be appreciated as well. Overall it seems like a reasonable idea, although it lacks a formal processing model. Another thing I'm not entirely sure about is whether cross-origin information could be easily gathered if both origins run in the same process.

Comment 6

[Olli Pettay [:smaug][[e-mail]]]

The DOM API side would be tiny thing here.