1447747 - Strange entry in MAIN_THREAD_RUNNABLE_MS on nightly

Status: RESOLVED INVALID

(Core :: DOM: Content Processes, enhancement, P5)

Description

[Mike Kaply [:mkaply]]

If you do a search in Firefox on the URL bar and then check telemetry (search on search), you'll see this entry:

handleEvent/<[search.xml]:JS(unlabeled)
2 samples, average = 0, sum = 0

0 |#########################  2  100%
1 |  0  0%

in about:telemetry.

Looks like a malformed event name (handleEvent/<[search.xml]:JS(unlabeled))

Comment 1

[Andreas Farre [:farre]]

What we see here is the result from a XPCWrappedJSClass' nsINamed::GetName, as implemented here[1]. So it's the JS function named handleEvent found in search.xml, and it happens to not belong to a TabGroup (because of '(unlabeled)').

So that name is exactly what you'd get from XPCWrappedJSClass runnables.

Is something not working due to the name?

[1] https://searchfox.org/mozilla-central/source/js/xpconnect/src/XPCWrappedJSClass.cpp#444

Comment 2

[Mike Kaply [:mkaply]]

> Is something not working due to the name?

No, it just looked malformed to me in telemetry So I assumed something was wrong. In particular the presence of /< made it look like some sort of broken HTML.

Is the information actionable based on the malformed name? I'm just wondering why we'd be collecting something like this that isn't actionable.

What information does this give us?

Comment 3

[Jens Stutte [:jstutte]]

A search on searchfox tells me that MAIN_THREAD_RUNNABLE_MS does not exist any more.