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Is it normal that the swapper task causes most timer wakeups?

Asked by PeterPall

I did a

echo 1 >/proc/timer_stats

followed by a

cat /proc/timer_stats

I surrently don't have any swap file or partition. Is it normal that swapper/0 and swapper/2 still cause the majority of timer wakeups?

Am currently running Linux version 4.7.0-040700rc2-lowlatency

Sample period: 724.882 s
Collection: active
 61205, 0 swapper/0 tick_nohz_restart (tick_sched_timer)
 54814, 0 swapper/2 tick_nohz_restart (tick_sched_timer)
 24337, 7 rcu_preempt rcu_gp_kthread (process_timeout)
 9297, 0 swapper/2 __tick_nohz_idle_enter (tick_sched_timer)
  948, 3958 gnome-terminal- schedule_hrtimeout_range_clock (hrtimer_wakeup)
 61256, 0 swapper/3 tick_nohz_restart (tick_sched_timer)
 56990, 0 swapper/1 tick_nohz_restart (tick_sched_timer)
 6351, 2151 compiz schedule_hrtimeout_range_clock (hrtimer_wakeup)
 2299, 112 systemd-udevd gen6_read32 (intel_uncore_fw_release_timer)

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actionparsnip
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Revision history for this message
Best actionparsnip (andrew-woodhead666) said : 		#1

Then I suggest you report a bug to the guys you downloaded the kernel from. Does the official kernel from your release not run your hardware OK?

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PeterPall (peterpall) said : 		#2

It is good to know you are still around!
Have submitted the bug as https://bugzilla.kernel.org/show_bug.cgi?id=120291 - which actually should have been my actual question: Does it make sense to report this bug.

Kernels <4.3 don't support my epson scanner on USB and kernels <4.6 sometimes looses fonts and bitmaps saved in my intel integrated graphics on suspend. but 4.6 is fine and seems to use less battery on my acer aspire s7 than earlier versions => will revert to this kernel.

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PeterPall (peterpall) said : 		#3

Thanks actionparsnip, that solved my question.