[nrf fromtree] Add cpu_load module #2657
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This was referenced Mar 21, 2025
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Add module which can measure CPU idle time. Idle time is measured in the pre/post CPU idle hooks but they are not provided by this module. Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no> (cherry picked from commit c7d7aac)
Add new tracing API which is called when core is exiting from idle. Current implementation is using it to track CPU load. Implementation in tracing_none is now weak so it can be used if given backend does not support new API call. When CONFIG_CPU_LOAD is enabled then sys_trace_idle also calls a hook which stores the timing information when CPU entered idle. Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no> (cherry picked from commit 4cbafc6)
Add calls to sys_trace_idle_exit when leaving idle state. It is used to track CPU load. Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no> (cherry picked from commit 0ec2ad5)
Add test for CPU load. Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no> (cherry picked from commit 688b561)
Add documentation for CPU load module. Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no> (cherry picked from commit f68a086)
Add sys_trace_idle_exit to RISCV cpu_idle functions and allow enabling CPU_LOAD module for RISCV and disable it for SMP. Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no> (cherry picked from commit 4026daa)
Allow test execution for riscv since it now supports cpu_load module. Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no> (cherry picked from commit 29bc28a)
Add calls to sys_trace_idle and sys_trace_idle_exit in nrf54h specific idle states to allow measuring CPU load on nrf54h20 when power management is enabled. Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no> (cherry picked from commit 37fe750)
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Add cpu_load module with support for cortex_m and riscv.
nrf54h20dk//cpuppr and cpuflpr will report invalid value (100%) because of VPR bug which requires that they use custom idle functions which do not block interrupts when going to idle. FLPR on nRF54L does not have that bug so cpu_load works correctly on that target.