1007647 - Add support for getting realtime and/or uptime milliseconds since boot in JavaScript for Telemetry

Status: RESOLVED INCOMPLETE

(Firefox for Android Graveyard :: General, defect)

Description

[Mark Finkle (:mfinkle) (use needinfo?)]

Telemetry events and sessions use a relative timestamp. In Java we have access to SystemClock.elapsedRealtime() and SystemClock.uptimeMillis() but we don't in JavaScript.

Let's see if we can expose those somehow and use those to create fallback timestamps so callers don't always need to pass in a timestamp.

Comment 1

[Richard Newman [:rnewman]]

Relevant:

http://stackoverflow.com/questions/6360210/androidlinux-uptime-using-clock-monotonic

http://mxr.mozilla.org/mozilla-central/source/browser/app/nsBrowserApp.cpp#454

Comment 2

[:Irving Reid (No longer working on Firefox)]

Does bug 969490 solve this for you?

Comment 3

[Mark Finkle (:mfinkle) (use needinfo?)]

(In reply to :Irving Reid from comment #2)
> Does bug 969490 solve this for you?

It allows us to improve our current code:
http://mxr.mozilla.org/mozilla-central/source/toolkit/components/telemetry/UITelemetry.jsm#93

IIUC, we can now change:
return Date.now() - Services.startup.getStartupInfo().process;

to this:
return Components.utils.now();

And we have better precision.

In both cases, the "uptime" is measured from the process creation. To match Java's uptime definition, we want the timebase to be device boot.

Comment 4

[BMO Automation]

We have completed our launch of our new Firefox on Android. The development of the new versions use GitHub for issue tracking. If the bug report still reproduces in a current version of [Firefox on Android nightly](https://play.google.com/store/apps/details?id=org.mozilla.fenix) an issue can be reported at the [Fenix GitHub project](https://github.com/mozilla-mobile/fenix/). If you want to discuss your report please use [Mozilla's chat](https://wiki.mozilla.org/Matrix#Connect_to_Matrix) server https://chat.mozilla.org and join the [#fenix](https://chat.mozilla.org/#/room/#fenix:mozilla.org) channel.