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kernel: extend CPU runtime stats

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Extends the CPU usage runtime stats to track current, total, peak
and average usage (as bounded by the scheduling of the idle thread).
This permits a developer to obtain more system information if desired
to tune the system.

Signed-off-by: Peter Mitsis <peter.mitsis@intel.com>
This commit is contained in:
Peter Mitsis 2021-12-14 22:26:22 -05:00 • committed by Anas Nashif
commit 4eb1dd02cc
5 changed files with 106 additions and 16 deletions
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11
include/kernel/thread.h
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@ -174,6 +174,7 @@ struct _thread_userspace_local_data {
typedef struct k_thread_runtime_stats {
#ifdef CONFIG_SCHED_THREAD_USAGE
uint64_t execution_cycles;
uint64_t total_cycles; /* total # of non-idle cycles */
/*
* In the context of thread statistics, [execution_cycles] is the same
* as the total # of non-idle cycles. In the context of CPU statistics,
@ -182,11 +183,19 @@ typedef struct k_thread_runtime_stats {
#endif
#ifdef CONFIG_SCHED_THREAD_USAGE_ANALYSIS
/*
* For threads, the following fields refer to the time spent executing
* as bounded by when the thread was scheduled in and scheduled out.
* For CPUs, the same fields refer to the time spent executing
* non-idle threads as bounded by the idle thread(s).
*/
uint64_t current_cycles; /* current # of non-idle cycles */
uint64_t peak_cycles; /* peak # of non-idle cycles */
uint64_t total_cycles; /* total # of non-idle cycles */
uint64_t average_cycles; /* average # of non-idle cycles */
#endif
#ifdef CONFIG_SCHED_THREAD_USAGE_ALL
/*
* This field is always zero for individual threads. It only comes
* into play when gathering statistics for the CPU. In that case it