840410 - Add Start-up Performance Reporting

Status: RESOLVED FIXED

(Core :: Gecko Profiler, defect)

Description

[Benoit Girard (:BenWa)]

The biggest problem with start-up performance reporting is we need a way to find early on startup if the user has opt-ed into performance reporting. Reading preference is out because it's too late. Here's are the options:
1) Looks for a magic file in the profile directory. -Main thread IO on early startup
2) Use windows registery. -Doesn't support other platforms
3) Always profile startup. -Profiler still has a few crash bugs, bad for startup performance.
4) Only profile startup on restarts/updates. -No cold startup information.

Comment 1

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

This is possible through environment variables like MOZ_PROFILER_STARTUP (can't see when it was added).