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kernel: extend thread runtime stats

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When the new Kconfig option CONFIG_SCHED_THREAD_USAGE_ANALYSIS
is enabled, additional timing stats are collected during context
switches. This extra information allows a developer to obtain the
the current, longest, average and total lengths of the time that
a thread has been scheduled to execute.

A developer can in turn use this information to tune their app and/or
alter their scheduling policies.

Signed-off-by: Peter Mitsis <peter.mitsis@intel.com>
This commit is contained in:
Peter Mitsis 2021-12-14 21:31:10 -05:00 • committed by Anas Nashif
commit 572f1db56a
4 changed files with 122 additions and 21 deletions
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26
include/kernel/stats.h Normal file
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/*
* Copyright (c) 2021, Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef ZEPHYR_INCLUDE_KERNEL_STATS_H_
#define ZEPHYR_INCLUDE_KERNEL_STATS_H_
#include <stdint.h>
/*
* [k_cycle_stats] is used to track internal statistics about both thread
* and CPU usage.
*/
struct k_cycle_stats {
uint64_t total; /* total usage in cycles */
#ifdef CONFIG_SCHED_THREAD_USAGE_ANALYSIS
uint64_t current; /* # of cycles in current usage window */
uint64_t longest; /* # of cycles in longest usage window */
uint32_t num_windows; /* # of usage windows */
#endif
};
#endif