tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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}