touch-packages team mailing list archive

[Ricardo Salveti <rsalveti@xxxxxxxxxxxx>]

After profiling upower, this is actually not an issue in there, as the
only thing it is doing is getting the battery change event from the
kernel, updating the internal struct and sending another dbus message so
the clients could see the changes.

The main issue here is that the kernel is sending a big amount of
battery events (all valid, and different changes), which results in
udev, upower and dbus consuming a bit of your cpu.

Verified this bug against both krillin and arale and that is not the
case there, as I already did the profiling and reduced the amount of
battery events.

As this bug is just specific to mako, and would require a kernel change
to reduce the amount of events, we can lower the priority and fix in
vivid only.

** Summary changed:

- upower consuming over 17% cpu 
+ [mako] upower consuming over 17% cpu when in idle

** Description changed:

  From the meta battery bug # 1372413
  mako running 191
  
  As device was not suspending and battery level running down, upower is reported at 17%+ cpu by the cpustat tool
-  mpdecision and systemd-udevd also change their behavior.
+  mpdecision and systemd-udevd also change their behavior.
+ 
+ The upower cpu consumption is just a side effect of the amount of
+ battery related events the kernel send, and specific to mako.

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to upower in Ubuntu.
https://bugs.launchpad.net/bugs/1420395

Title:
  [mako] upower consuming over 17% cpu when in idle

Status in the base for Ubuntu mobile products:
  Confirmed
Status in upower package in Ubuntu:
  Confirmed

Bug description:
  From the meta battery bug # 1372413
  mako running 191

  As device was not suspending and battery level running down, upower is reported at 17%+ cpu by the cpustat tool
   mpdecision and systemd-udevd also change their behavior.

  The upower cpu consumption is just a side effect of the amount of
  battery related events the kernel send, and specific to mako.

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