1721700 - Make the pref browser.tabs.unloadOnLowMemory dynamic

Status: RESOLVED FIXED

(Firefox :: Tabbed Browser, enhancement)

Description

[Toshihito Kikuchi [:toshi]]

Currently changing the pref browser.tabs.unloadOnLowMemory requires process restart. This is a task to make the pref dynamic (= changeable in the middle of session) to make the Normandy experiment easier.

Comment 1

[Toshihito Kikuchi [:toshi]]

Attachment: Bug 1721700 - Move browser.tabs.unloadOnLowMemory to TabUnloader.unloadTabAsync. r=haik

We have the pref browser.tabs.unloadOnLowMemory to turn on the tab unloading
feature. Since it controlled whether we initialize the memory watcher or not
in TabUnloader.init(), changing it required process start.

To conduct A/B testing for this feature, our infrastructure needs to be able
to change the pref in the middle of session. So this change moves the pref
check from TabUnloader.init() to TabUnloader.unloadTabAsync(). With this,
we fully exercise the memoruy watcher regardless of the pref's value, but invokes
tab unloading or memory-pressure only when the pref is on.

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/a8d9e102189a
Move browser.tabs.unloadOnLowMemory to TabUnloader.unloadTabAsync.  r=haik

Comment 3

[Natalia Csoregi [:nataliaCs]]

https://hg.mozilla.org/mozilla-central/rev/a8d9e102189a