CPU utilization calculation and Idle task

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CPU utilization is currently calculated using an idle task. This can waste power and prevents the processor(s) from entering sleep or other power management states. As part of the SMP implementation this issue should also be addressed.

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Imported from trac issue 259. Created by jwilmot on 2018-11-27T12:55:23, last modified: 2019-07-03T12:58:32

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Trac comment by jhageman on 2019-05-28 14:55:16:

Note Shiraz implementation for PACE:

The CPU usage task (CU) is running on the IPLEON processor which is running RTEMS as the OS. RTEMS has a shell command ‘cpuusage’ which dumps all the CPU statistics to the terminal window.
Details of this command can be found at this link
https://docs.rtems.org/branches/master/c-user/cpu_usage_statistics.html
The CU task was just invoking this function at each 1 Hz wakeup and populating the data into the telemetry packet.

Total CPU utilization is calculated as 100.0 % – (Idle task CPU utilization %)

They are not actively managing power via the idle task (low power sleep mode).

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Trac comment by jhageman on 2019-07-03 12:58:32:

Moved unfinished 6.7.0 tickets to next release