874366 - [system] Device very unresponsive while update gets uncompressed/unzipped/unpacked, power button has to be hold/pushed very long if screen turned off

Status: RESOLVED WONTFIX

(Firefox OS Graveyard :: Gaia::System::Lockscreen, enhancement)

Description

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

At the moment, if an update has been downloaded and is currently being uncompressed and screen turned off, you have to press the power button several seconds like when you want to shut down the phone. This can scare the users that the update failed/the device got bricked and is a bad user experience.

Comment 1

[Dave Hylands [:dhylands]]

The updater process which performs the uncompression should be running with the lowest priority, and a low I/O priority.

So I'm guessing it will take some investigation to figure out what's going on.

Comment 2

[Dave Hylands [:dhylands]]

I reproduced this using a userdebug build on my unagi.

Running "top -m 10"

I'm seeing something like this:

User 99%, System 0%, IOW 0%, IRQ 0%
User 301 + Nice 6 + Sys 3 + Idle 0 + IOW 0 + IRQ 0 + SIRQ 0 = 310

  PID PR CPU% S  #THR     VSS     RSS PCY UID      Name
  470  0  97% R    33 195032K  81104K  fg root     /system/b2g/b2g
  715  0   1% S     2   6476K   4864K  fg root     /data/local/updates/0/updater
  854  0   1% R     1   1060K    420K  fg root     top

And the updater itself (which is the thing doing the uncompressing) is also being dramatically slowed down.

Comment 3

[Dave Hylands [:dhylands]]

I tried to grab a profile, but b2g crashes when the profiler is enabled.

Comment 4

[BMO Automation]

Firefox OS is not being worked on