1397444 - Add the ability for the Gecko Profiler to detect regions of high CPU usage

Status: NEW

(Core :: Gecko Profiler, enhancement, P3)

Description

[Mike Conley (:mconley) (:⚙️)]

Bug 1359550 is one of several "Firefox is eating all of my CPU" bugs I've seen go by recently that I've had to give up on simply because I couldn't find any actionable data from the profiler. Or UIforETW.

Post-57, would it be possible to add some kind of "high CPU detection mode" to the profiler to make it easier to find out what's eating up our users' cycles?

Comment 1

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

Bug 1329600 now records the CPU usage of each sampled thread (front-end part still WIP).
It's only the start, I will experiment with recording the CPU usage of all registered threads, of whole processes (including unregistered threads), and where possible other system-wide information. Hopefully all this will help with this bug here.