1734597 - about:processes shows slightly active threads and processes as idle on Windows

Status: RESOLVED FIXED

(Toolkit :: Performance Monitoring, defect)

Description

[Florian Quèze [:florian]]

On Windows the resolution of the CPU time information is 16ms, so any thread that used less than 16ms in the last seconds is reported as idle. This is annoying because it means we can't figure out which threads cause many short CPU wake ups. The API that is reliable on Windows is the API returning the thread cycle count, so we can use it as a fallback to decide which threads are idle.

Comment 1

[Florian Quèze [:florian]]

Attachment: Bug 1734597 - Make about:processes fallback to cycle count to decide if a thread or process is active to workaround low CPU timing precision on Windows, r=dthayer.

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/df62726f3d16
Make about:processes fallback to cycle count to decide if a thread or process is active to workaround low CPU timing precision on Windows, r=dthayer,fluent-reviewers,flod.

Comment 3

[Marian-Vasile Laza]

https://hg.mozilla.org/mozilla-central/rev/df62726f3d16