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

Confirmed. Even after turning off all location services, this continues
to have the highest number of wakeups of any user service:

$ sudo eventstat
 Event/s PID   Task            Init Function             Callback
   26.00     0 [swapper/0]     hrtimer_start_range_ns    tick_sched_timer
   20.00     0 [swapper/0]     hrtimer_start             tscpu_update_tempinfo
   20.00 22750 [kworker/0:0]   OSTimerWorkQueueCallBack  OSTimerCallbackWrapper
   10.00  2556 ubuntu-location hrtimer_start_range_ns    hrtimer_wakeup   <------------------------------------------------
    8.00     0 [swapper/0]     hrtimer_start             tick_sched_timer
    5.00 25671 unity8          hrtimer_start_range_ns    hrtimer_wakeup
    3.00    57 [hps_main]      _hps_task_main            process_timeout
    2.00  1370 gmain           hrtimer_start_range_ns    hrtimer_wakeup
    2.00 25706 ubuntu-push-cli hrtimer_start_range_ns    hrtimer_wakeup
    1.00     1 [swapper/0]     start_bandwidth_timer     sched_rt_period_timer
    1.00     0 [swapper/0]     mlog_timer_handler        mlog_timer_handler
    1.00  1879 [tx_thread]     __pm_wakeup_event         pm_wakeup_timer_fn
    1.00 22750 [kworker/0:0]   osal_timer_modify         _stp_psm_stp_is_idle
    1.00 15947 sshd            sk_reset_timer            tcp_write_timer
    1.00 25751 ubuntu-push-cli hrtimer_start_range_ns    hrtimer_wakeup
    1.00     0 [swapper/0]     add_timer                 wmt_cal_stats
    1.00   847 6620_launcher   hrtimer_start_range_ns    hrtimer_wakeup
    1.00 22750 [kworker/0:0]   schedule_timeout_uninterruptible process_timeout
    1.00     1 [swapper/0]     hrtimer_start             charger_hv_detect_sw_workaround
106 Total events, 106.00 events/sec (kernel: 84.00, userspace: 22.00)

The PID is deceiving. It's actually a thread of a different PID which is
/usr/bin/ubuntu-location-serviced

$ system-image-cli -i
current build number: 94
device name: arale
channel: ubuntu-touch/rc-proposed/ubuntu
last update: 2015-08-28 07:44:31
version version: 94
version ubuntu: 20150828
version device: 20150818-0b38025
version custom: 20150828


** Also affects: ubuntu-power-consumption
   Importance: Undecided
       Status: New

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to location-service in
Ubuntu.
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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