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
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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?
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-power-consumption/+bug/1350871/+subscriptions
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