1 /* 2 * Copyright (c) 2025 Analog Devices, Inc. 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 */ 6 7 #include <zephyr/kernel.h> 8 #include <zephyr/logging/log.h> 9 10 LOG_MODULE_REGISTER(cpu_load_metric, CONFIG_CPU_LOAD_LOG_LEVEL); 11 12 static uint64_t execution_cycles_prev[CONFIG_MP_MAX_NUM_CPUS]; 13 static uint64_t total_cycles_prev[CONFIG_MP_MAX_NUM_CPUS]; 14 15 static struct k_spinlock lock[CONFIG_MP_MAX_NUM_CPUS]; 16 cpu_load_metric_get(int cpu_id)17int cpu_load_metric_get(int cpu_id) 18 { 19 int ret; 20 int load; 21 uint64_t execution_cycles; 22 uint64_t total_cycles; 23 k_spinlock_key_t key; 24 25 struct k_thread_runtime_stats cpu_query; 26 27 ret = k_thread_runtime_stats_cpu_get(cpu_id, &cpu_query); 28 if (ret) { 29 LOG_ERR("Could not retrieve runtime statistics from scheduler"); 30 return ret; 31 } 32 33 key = k_spin_lock(&lock[cpu_id]); 34 35 execution_cycles = cpu_query.execution_cycles - execution_cycles_prev[cpu_id]; 36 total_cycles = cpu_query.total_cycles - total_cycles_prev[cpu_id]; 37 38 execution_cycles_prev[cpu_id] = cpu_query.execution_cycles; 39 total_cycles_prev[cpu_id] = cpu_query.total_cycles; 40 41 k_spin_unlock(&lock[cpu_id], key); 42 43 LOG_DBG("CPU%d Execution cycles: %llu, Total cycles: %llu", 44 cpu_id, execution_cycles, total_cycles); 45 46 if (execution_cycles == 0) { 47 load = 0; 48 } else { 49 load = (int)((100 * total_cycles) / execution_cycles); 50 } 51 52 return load; 53 } 54
