162306a36Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0-only 262306a36Sopenharmony_ci/* 362306a36Sopenharmony_ci * Copyright 2016, Anton Blanchard, Michael Ellerman, IBM Corp. 462306a36Sopenharmony_ci */ 562306a36Sopenharmony_ci 662306a36Sopenharmony_ci#define _GNU_SOURCE 762306a36Sopenharmony_ci 862306a36Sopenharmony_ci#include <stdio.h> 962306a36Sopenharmony_ci#include <sys/syscall.h> 1062306a36Sopenharmony_ci#include <time.h> 1162306a36Sopenharmony_ci#include <unistd.h> 1262306a36Sopenharmony_ci#include <linux/futex.h> 1362306a36Sopenharmony_ci 1462306a36Sopenharmony_ci#include "utils.h" 1562306a36Sopenharmony_ci 1662306a36Sopenharmony_ci#define ITERATIONS 100000000 1762306a36Sopenharmony_ci 1862306a36Sopenharmony_ci#define futex(A, B, C, D, E, F) syscall(__NR_futex, A, B, C, D, E, F) 1962306a36Sopenharmony_ci 2062306a36Sopenharmony_ciint test_futex(void) 2162306a36Sopenharmony_ci{ 2262306a36Sopenharmony_ci struct timespec ts_start, ts_end; 2362306a36Sopenharmony_ci unsigned long i = ITERATIONS; 2462306a36Sopenharmony_ci 2562306a36Sopenharmony_ci clock_gettime(CLOCK_MONOTONIC, &ts_start); 2662306a36Sopenharmony_ci 2762306a36Sopenharmony_ci while (i--) { 2862306a36Sopenharmony_ci unsigned int addr = 0; 2962306a36Sopenharmony_ci futex(&addr, FUTEX_WAKE, 1, NULL, NULL, 0); 3062306a36Sopenharmony_ci } 3162306a36Sopenharmony_ci 3262306a36Sopenharmony_ci clock_gettime(CLOCK_MONOTONIC, &ts_end); 3362306a36Sopenharmony_ci 3462306a36Sopenharmony_ci printf("time = %.6f\n", ts_end.tv_sec - ts_start.tv_sec + (ts_end.tv_nsec - ts_start.tv_nsec) / 1e9); 3562306a36Sopenharmony_ci 3662306a36Sopenharmony_ci return 0; 3762306a36Sopenharmony_ci} 3862306a36Sopenharmony_ci 3962306a36Sopenharmony_ciint main(void) 4062306a36Sopenharmony_ci{ 4162306a36Sopenharmony_ci test_harness_set_timeout(300); 4262306a36Sopenharmony_ci return test_harness(test_futex, "futex_bench"); 4362306a36Sopenharmony_ci} 44