1 #include <errno.h>
2 #include <stdio.h>
3 #include <stdlib.h>
4 #include <string.h>
5 #include <sys/mman.h>
6 #include <sys/time.h>
7
8 #include "pagingtest.h"
9
mmap_test(int test_runs,unsigned long long alloc_size)10 int mmap_test(int test_runs, unsigned long long alloc_size) {
11 void *buf;
12 int ret = -1;
13 int i;
14 struct timeval begin_time, end_time, elapsed_time;
15 struct timeval total_time_mmap, total_time_munmap, total_time_in, total_time_out;
16
17 timerclear(&total_time_mmap);
18 timerclear(&total_time_munmap);
19 timerclear(&total_time_in);
20 timerclear(&total_time_out);
21
22 for (i = 0; i < test_runs; i++) {
23 gettimeofday(&begin_time, NULL);
24 buf = mmap(NULL, alloc_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
25 gettimeofday(&end_time, NULL);
26 if (buf == ((void *)-1)) {
27 fprintf(stderr, "Failed to mmap anonymous memory: %s\n", strerror(errno));
28 goto err_map;
29 }
30 timersub(&end_time, &begin_time, &elapsed_time);
31 timeradd(&total_time_mmap, &elapsed_time, &total_time_mmap);
32
33 gettimeofday(&begin_time, NULL);
34 munmap(buf, alloc_size);
35 gettimeofday(&end_time, NULL);
36 timersub(&end_time, &begin_time, &elapsed_time);
37 timeradd(&total_time_mmap, &elapsed_time, &total_time_mmap);
38 }
39
40 printf("mmap: %llu us\n", total_time_mmap.tv_sec * USEC_PER_SEC + total_time_mmap.tv_usec);
41 printf("munmap: %llu us\n", total_time_munmap.tv_sec * USEC_PER_SEC + total_time_munmap.tv_usec);
42
43 ret = 0;
44 goto end;
45 // err:
46 munmap(buf, alloc_size); // unreached?
47 end:
48 err_map:
49 return ret;
50 }
51