LXR linux/tools/testing/selftests/powerpc/benchmarks/mmap

   1/*
   2 * Copyright 2016, Anton Blanchard, Michael Ellerman, IBM Corp.
   3 * Licensed under GPLv2.
   4 */
   5
   6#include <stdio.h>
   7#include <stdlib.h>
   8#include <sys/mman.h>
   9#include <time.h>
  10
  11#include "utils.h"
  12
  13#define ITERATIONS 5000000
  14
  15#define MEMSIZE (128 * 1024 * 1024)
  16
  17int test_mmap(void)
  18{
  19        struct timespec ts_start, ts_end;
  20        unsigned long i = ITERATIONS;
  21
  22        clock_gettime(CLOCK_MONOTONIC, &ts_start);
  23
  24        while (i--) {
  25                char *c = mmap(NULL, MEMSIZE, PROT_READ|PROT_WRITE,
  26                               MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
  27                FAIL_IF(c == MAP_FAILED);
  28                munmap(c, MEMSIZE);
  29        }
  30
  31        clock_gettime(CLOCK_MONOTONIC, &ts_end);
  32
  33        printf("time = %.6f\n", ts_end.tv_sec - ts_start.tv_sec + (ts_end.tv_nsec - ts_start.tv_nsec) / 1e9);
  34
  35        return 0;
  36}
  37
  38int main(void)
  39{
  40        return test_harness(test_mmap, "mmap_bench");
  41}
  42