| /* |
| * Copyright (c) 2024 Intel Corporation |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| /* |
| * @file measure time for various event operations |
| * |
| * This file contains the tests that measure the times for manipulating |
| * event objects from both kernel and user threads: |
| * 1. Immediately posting and setting events |
| * 2. Immediately receiving any or all events. |
| * 3. Blocking to receive either any or all events. |
| * 4. Waking (and switching to) a thread waiting for any or all events. |
| */ |
| |
| #include <zephyr/kernel.h> |
| #include <zephyr/timing/timing.h> |
| #include "utils.h" |
| #include "timing_sc.h" |
| |
| #define BENCH_EVENT_SET 0x1234 |
| #define ALL_EVENTS 0xFFFFFFFF |
| |
| static K_EVENT_DEFINE(event_set); |
| |
| static void event_ops_entry(void *p1, void *p2, void *p3) |
| { |
| uint32_t num_iterations = (uint32_t)(uintptr_t)p1; |
| timing_t start; |
| timing_t finish; |
| uint32_t i; |
| |
| /* 2. Benchmark k_event_post() with no waiters */ |
| |
| k_event_clear(&event_set, ALL_EVENTS); |
| |
| start = timing_timestamp_get(); |
| for (i = 0; i < num_iterations; i++) { |
| k_event_post(&event_set, BENCH_EVENT_SET); |
| } |
| finish = timing_timestamp_get(); |
| |
| timestamp.cycles = timing_cycles_get(&start, &finish); |
| |
| /* 3. Pause to allow main thread to print results */ |
| |
| k_sem_take(&pause_sem, K_FOREVER); |
| |
| /* 5. Benchmark k_event_set() with no waiters */ |
| |
| start = timing_timestamp_get(); |
| for (i = 0; i < num_iterations; i++) { |
| k_event_set(&event_set, BENCH_EVENT_SET); |
| } |
| finish = timing_timestamp_get(); |
| |
| timestamp.cycles = timing_cycles_get(&start, &finish); |
| |
| /* 6. Pause to allow main thread to print results */ |
| |
| k_sem_take(&pause_sem, K_FOREVER); |
| |
| /* 8. Benchmark k_event_wait() (events have already been set) */ |
| |
| start = timing_timestamp_get(); |
| for (i = 0; i < num_iterations; i++) { |
| k_event_wait(&event_set, BENCH_EVENT_SET, false, K_FOREVER); |
| } |
| finish = timing_timestamp_get(); |
| |
| timestamp.cycles = timing_cycles_get(&start, &finish); |
| |
| /* 9. Pause to allow main thread to print results */ |
| |
| k_sem_take(&pause_sem, K_FOREVER); |
| |
| /* 11. Benchmark k_event_wait_all() (events have already been set) */ |
| |
| start = timing_timestamp_get(); |
| for (i = 0; i < num_iterations; i++) { |
| k_event_wait_all(&event_set, BENCH_EVENT_SET, false, K_FOREVER); |
| } |
| finish = timing_timestamp_get(); |
| |
| timestamp.cycles = timing_cycles_get(&start, &finish); |
| |
| /* 12. Thread finishes */ |
| } |
| |
| static void start_thread_entry(void *p1, void *p2, void *p3) |
| { |
| uint32_t num_iterations = (uint32_t)(uintptr_t)p1; |
| uint32_t i; |
| |
| k_thread_start(&alt_thread); |
| |
| for (i = 0; i < num_iterations; i++) { |
| |
| /* 2. Set the events to wake alt_thread */ |
| |
| timestamp.sample = timing_timestamp_get(); |
| k_event_set(&event_set, BENCH_EVENT_SET); |
| } |
| |
| for (i = 0; i < num_iterations; i++) { |
| |
| /* 5. Post the events to wake alt_thread */ |
| |
| timestamp.sample = timing_timestamp_get(); |
| k_event_post(&event_set, BENCH_EVENT_SET); |
| } |
| |
| k_thread_join(&alt_thread, K_FOREVER); |
| } |
| |
| static void alt_thread_entry(void *p1, void *p2, void *p3) |
| { |
| uint32_t num_iterations = (uint32_t)(uintptr_t)p1; |
| uint32_t i; |
| timing_t start; |
| timing_t mid; |
| timing_t finish; |
| uint64_t sum[4] = {0ULL, 0ULL, 0ULL, 0ULL}; |
| |
| for (i = 0; i < num_iterations; i++) { |
| |
| /* 1. Wait for any of the events */ |
| |
| start = timing_timestamp_get(); |
| k_event_wait(&event_set, BENCH_EVENT_SET, true, K_FOREVER); |
| |
| /* 3. Record the final timestamp */ |
| |
| finish = timing_timestamp_get(); |
| mid = timestamp.sample; |
| |
| sum[0] += timing_cycles_get(&start, &mid); |
| sum[1] += timing_cycles_get(&mid, &finish); |
| } |
| |
| for (i = 0; i < num_iterations; i++) { |
| |
| /* 4. Wait for all of the events */ |
| |
| start = timing_timestamp_get(); |
| k_event_wait_all(&event_set, BENCH_EVENT_SET, true, K_FOREVER); |
| |
| /* 6. Record the final timestamp */ |
| |
| finish = timing_timestamp_get(); |
| mid = timestamp.sample; |
| |
| sum[2] += timing_cycles_get(&start, &mid); |
| sum[3] += timing_cycles_get(&mid, &finish); |
| } |
| |
| /* Let the main thread print the results */ |
| |
| timestamp.cycles = sum[0]; |
| k_sem_take(&pause_sem, K_FOREVER); |
| |
| timestamp.cycles = sum[1]; |
| k_sem_take(&pause_sem, K_FOREVER); |
| |
| timestamp.cycles = sum[2]; |
| k_sem_take(&pause_sem, K_FOREVER); |
| |
| timestamp.cycles = sum[3]; |
| } |
| |
| int event_ops(uint32_t num_iterations, uint32_t options) |
| { |
| int priority; |
| char tag[50]; |
| char description[120]; |
| uint64_t cycles; |
| |
| priority = k_thread_priority_get(k_current_get()); |
| |
| timing_start(); |
| |
| k_thread_create(&start_thread, start_stack, |
| K_THREAD_STACK_SIZEOF(start_stack), |
| event_ops_entry, |
| (void *)(uintptr_t)num_iterations, |
| NULL, NULL, |
| priority - 1, options, K_FOREVER); |
| |
| k_thread_access_grant(&start_thread, &event_set, &pause_sem); |
| |
| /* 1. Start test thread */ |
| |
| k_thread_start(&start_thread); |
| |
| /* 4. Benchmark thread has paused */ |
| |
| snprintf(tag, sizeof(tag), "events.post.immediate.%s", |
| (options & K_USER) ? "user" : "kernel"); |
| snprintf(description, sizeof(description), |
| "%-40s - Post events (nothing wakes)", tag); |
| |
| cycles = timestamp.cycles; |
| PRINT_STATS_AVG(description, (uint32_t)cycles, |
| num_iterations, false, ""); |
| |
| k_sem_give(&pause_sem); |
| |
| /* 7. Benchmark thread has paused */ |
| |
| snprintf(tag, sizeof(tag), "events.set.immediate.%s", |
| (options & K_USER) ? "user" : "kernel"); |
| snprintf(description, sizeof(description), |
| "%-40s - Set events (nothing wakes)", tag); |
| cycles = timestamp.cycles; |
| PRINT_STATS_AVG(description, (uint32_t)cycles, |
| num_iterations, false, ""); |
| |
| k_sem_give(&pause_sem); |
| |
| /* 10. Benchmark thread has paused */ |
| |
| snprintf(tag, sizeof(tag), "events.wait.immediate.%s", |
| (options & K_USER) ? "user" : "kernel"); |
| snprintf(description, sizeof(description), |
| "%-40s - Wait for any events (no ctx switch)", tag); |
| cycles = timestamp.cycles; |
| PRINT_STATS_AVG(description, (uint32_t)cycles, |
| num_iterations, false, ""); |
| |
| k_sem_give(&pause_sem); |
| |
| /* 13. Benchmark thread has finished */ |
| |
| snprintf(tag, sizeof(tag), "events.wait_all.immediate.%s", |
| (options & K_USER) ? "user" : "kernel"); |
| snprintf(description, sizeof(description), |
| "%-40s - Wait for all events (no ctx switch)", tag); |
| cycles = timestamp.cycles; |
| PRINT_STATS_AVG(description, (uint32_t)cycles, |
| num_iterations, false, ""); |
| k_thread_join(&start_thread, K_FOREVER); |
| |
| timing_stop(); |
| |
| return 0; |
| } |
| |
| int event_blocking_ops(uint32_t num_iterations, uint32_t start_options, |
| uint32_t alt_options) |
| { |
| int priority; |
| char tag[50]; |
| char description[120]; |
| uint64_t cycles; |
| |
| priority = k_thread_priority_get(k_current_get()); |
| |
| timing_start(); |
| |
| k_thread_create(&start_thread, start_stack, |
| K_THREAD_STACK_SIZEOF(start_stack), |
| start_thread_entry, |
| (void *)(uintptr_t)num_iterations, |
| NULL, NULL, |
| priority - 1, start_options, K_FOREVER); |
| |
| k_thread_create(&alt_thread, alt_stack, |
| K_THREAD_STACK_SIZEOF(alt_stack), |
| alt_thread_entry, |
| (void *)(uintptr_t)num_iterations, |
| NULL, NULL, |
| priority - 2, alt_options, K_FOREVER); |
| |
| k_thread_access_grant(&start_thread, &alt_thread, &event_set, |
| &pause_sem); |
| k_thread_access_grant(&alt_thread, &event_set, &pause_sem); |
| |
| k_thread_start(&start_thread); |
| |
| snprintf(tag, sizeof(tag), |
| "events.wait.blocking.%c_to_%c", |
| (alt_options & K_USER) ? 'u' : 'k', |
| (start_options & K_USER) ? 'u' : 'k'); |
| snprintf(description, sizeof(description), |
| "%-40s - Wait for any events (w/ ctx switch)", tag); |
| cycles = timestamp.cycles - |
| timestamp_overhead_adjustment(start_options, alt_options); |
| PRINT_STATS_AVG(description, (uint32_t)cycles, |
| num_iterations, false, ""); |
| k_sem_give(&pause_sem); |
| |
| snprintf(tag, sizeof(tag), |
| "events.set.wake+ctx.%c_to_%c", |
| (start_options & K_USER) ? 'u' : 'k', |
| (alt_options & K_USER) ? 'u' : 'k'); |
| snprintf(description, sizeof(description), |
| "%-40s - Set events (w/ ctx switch)", tag); |
| cycles = timestamp.cycles - |
| timestamp_overhead_adjustment(start_options, alt_options); |
| PRINT_STATS_AVG(description, (uint32_t)cycles, |
| num_iterations, false, ""); |
| k_sem_give(&pause_sem); |
| |
| snprintf(tag, sizeof(tag), |
| "events.wait_all.blocking.%c_to_%c", |
| (alt_options & K_USER) ? 'u' : 'k', |
| (start_options & K_USER) ? 'u' : 'k'); |
| snprintf(description, sizeof(description), |
| "%-40s - Wait for all events (w/ ctx switch)", tag); |
| cycles = timestamp.cycles; |
| PRINT_STATS_AVG(description, (uint32_t)cycles, |
| num_iterations, false, ""); |
| k_sem_give(&pause_sem); |
| |
| snprintf(tag, sizeof(tag), |
| "events.post.wake+ctx.%c_to_%c", |
| (start_options & K_USER) ? 'u' : 'k', |
| (alt_options & K_USER) ? 'u' : 'k'); |
| snprintf(description, sizeof(description), |
| "%-40s - Post events (w/ ctx switch)", tag); |
| cycles = timestamp.cycles; |
| PRINT_STATS_AVG(description, (uint32_t)cycles, |
| num_iterations, false, ""); |
| |
| k_thread_join(&start_thread, K_FOREVER); |
| |
| timing_stop(); |
| |
| return 0; |
| } |