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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <AK/Types.h>
28#include <stdio.h>
29#include <stdlib.h>
30#include <string.h>
31#include <sys/mman.h>
32#include <unistd.h>
33
34int main(int argc, char** argv)
35{
36 size_t limit = 0;
37 size_t bite_size = 0;
38 int interval = 0;
39 if (argc == 1) {
40 limit = 42 * MB;
41 bite_size = 1 * MB;
42 interval = 200000;
43 } else if (argc == 4) {
44 bite_size = atoi(argv[1]);
45 limit = atoi(argv[2]);
46 interval = atoi(argv[3]);
47 } else {
48 printf("usage: munch [bite_size limit interval]\n");
49 return 1;
50 }
51
52 size_t munched = 0;
53 printf("Munching %zu bytes every %d ms, stopping at %zu\n", bite_size, interval / 1000, limit);
54 for (;;) {
55 auto* ptr = mmap(nullptr, bite_size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
56 if (ptr == MAP_FAILED) {
57 perror("mmap");
58 return 1;
59 }
60 memset(ptr, 0, bite_size);
61 munched += bite_size;
62 printf("Allocated: %zu\n", munched);
63 if (limit && munched >= limit) {
64 printf("All done!\n");
65 break;
66 }
67 usleep(interval);
68 }
69 return 0;
70}