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Linux/tools/testing/selftests/powerpc/benchmarks/futex_bench.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Copyright 2016, Anton Blanchard, Michael Ellerman, IBM Corp.
  4  */
  5 
  6 #define _GNU_SOURCE
  7 
  8 #include <stdio.h>
  9 #include <sys/syscall.h>
 10 #include <time.h>
 11 #include <unistd.h>
 12 #include <linux/futex.h>
 13 
 14 #include "utils.h"
 15 
 16 #define ITERATIONS 100000000
 17 
 18 #define futex(A, B, C, D, E, F)  syscall(__NR_futex, A, B, C, D, E, F)
 19 
 20 int test_futex(void)
 21 {
 22         struct timespec ts_start, ts_end;
 23         unsigned long i = ITERATIONS;
 24 
 25         clock_gettime(CLOCK_MONOTONIC, &ts_start);
 26 
 27         while (i--) {
 28                 unsigned int addr = 0;
 29                 futex(&addr, FUTEX_WAKE, 1, NULL, NULL, 0);
 30         }
 31 
 32         clock_gettime(CLOCK_MONOTONIC, &ts_end);
 33 
 34         printf("time = %.6f\n", ts_end.tv_sec - ts_start.tv_sec + (ts_end.tv_nsec - ts_start.tv_nsec) / 1e9);
 35 
 36         return 0;
 37 }
 38 
 39 int main(void)
 40 {
 41         test_harness_set_timeout(300);
 42         return test_harness(test_futex, "futex_bench");
 43 }
 44 

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