touch-packages team mailing list archive

[Daniel van Vugt <daniel.van.vugt@xxxxxxxxxxxxx>]

** Tags added: phablet

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https://bugs.launchpad.net/bugs/1350871

Title:
  location service is waking up at 10Hz causing possible unwanted
  wakeups

Status in The Ubuntu Power Consumption Project:
  New
Status in location-service package in Ubuntu:
  Confirmed

Bug description:
  I've observed that location service is waking up ~10 times per second
  due to a 100ms sleep

  ps -ax | grep 2295
   2295 ?        Ssl    0:00 /usr/bin/ubuntu-location-serviced --bus system --provider gps::Provider

  eventstat shows it's the top waking userspace process on the phone:

  root@ubuntu-phablet:/# eventstat 300 1
   Event/s PID   Task            Init Function             Callback
      9.99  2304 ubuntu-location hrtimer_start_range_ns    hrtimer_wakeup

  health-check shows that this is occuring in a 100ms nanosleep() system
  call.

  Attached is the output from health-check.   Is is possible to use a
  select() or poll() rather than a 10Hz non-blocking delay loop to
  reduce polling wakeups?

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