446418 - [meta] Investigate power management issues

Status: RESOLVED WONTFIX

(Firefox for Android Graveyard :: General, defect, P2)

Description

[Doug Turner (:dougt)]

It may be a good idea to suspend flash, animations, javascript, periodic network downloads, during idle time to conserve battery life.

Comment 1

[Doug Turner (:dougt)]

it isn't clear how best to implement power saving mode in fennec.  any help or
input appreciated.

Comment 2

[Oleg Romashin (:romaxa)]

Can we use appShell->SuspendNative/ResumeNative for it? at least it should stop native event loop, javascript/downloads/animations...

Comment 3

[Doug Turner (:dougt)]

I want to do as little as possible.  When system-idle event is given to our application, does the system suspend us -- does it prevent us from running, or makes us run slower/ get less time ?

Comment 4

[Oleg Romashin (:romaxa)]

I don't think that system do anything special, I think it is just notification which handled (or not) by other applications..

Comment 5

[Oleg Romashin (:romaxa)]

We should get rid of permanent UI timer callback see bug 508518

Comment 6

[Oleg Romashin (:romaxa)]

Patch for suspending sqlite database flusher:
https://garage.maemo.org/svn/browser/mozilla/trunk/microb-engine/microb-engine/debian/patches/pmt/DBFlush_systemIdle.diff

Patch for suspending permanent timer DeadConnection checker:
https://garage.maemo.org/svn/browser/mozilla/trunk/microb-engine/microb-engine/debian/patches/pmt/http_prune_timer.diff

Patch for suspending expired history checker in idle state:
https://garage.maemo.org/svn/browser/mozilla/trunk/microb-engine/microb-engine/debian/patches/pmt/navHistoryExpireTimer.diff

Comment 7

[Oleg Romashin (:romaxa)]

I think we should care not only about "system-idle" state, but also about default state when window is visible, and simple https/https page rendered (no active page internal JS timers).

Also background DOM windows must not do any unnecessary activity, painting, image animations, also some Javascript suspension required, if possible without breaking JS pages.

Comment 8

[Michael Kohler [:mkohler]]

This is a mass change. Every comment has "assigned-to-new" in it.

I didn't look through the bugs, so I'm sorry if I change a bug which shouldn't be changed. But I guess these bugs are just bugs that were once assigned and people forgot to change the Status back when unassigning.

Comment 9

[Jon Hemming]

Is there plans on how to resolve fennec use-time issues? Two different approaches are suggested: suspending/throttling on process level(bug 568054) or suspending where needed. Probably both of these are needed, but how is are those going to be implemented? Is there going to be some "idle-state" when all activity of the browser is going to be suspended? Will there be different states for suspending animation, javascript, checkers and so on? On unix side there are notifications like: "system-idle", "system-active", "system-display-on", "system-display-dimmed-or-off". Should these be used for all the mobile platforms also, like Meego, and implement suspending of different parts according to those and maybe some other notifications also? Is this a correct bug to talk about this or is there already a better meta bug or should that be created?

Comment 10

[Alon Zakai (:azakai)]

I think that we first need to get a good picture of the OS situation - what the OSes provide in terms of application lifecycle, what is expected from applications in the various states of the lifecycle (active, minimized, closed, background, etc.).

For example, there are good docs for Android about this: http://developer.android.com/guide/topics/fundamentals.html#lcycles

We need something similar for Maemo/MeeGo, and can then start to plan how to tackle this topic.

Comment 11

[Manish Goregaokar [:manishearth]]

Bug 978857 will introduce a module that will make it easier to write tests for these, FYI. As of now only FxOS has the ability to spoof the battery (in marionette)

Comment 12

[BMO Automation]

Closing all opened bug in a graveyard component