1 /*
2 * Out Of Memory (OOM)
3 *
4 * The program is designed to cope with unpredictable like amount and
5 * system physical memory, swap size and other VMM technology like KSM,
6 * memcg, memory hotplug and so on which may affect the OOM
7 * behaviours. It simply increase the memory consumption 3G each time
8 * until all the available memory is consumed and OOM is triggered.
9 *
10 * Copyright (C) 2010 Red Hat, Inc.
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of version 2 of the GNU General Public
13 * License as published by the Free Software Foundation.
14 *
15 * This program is distributed in the hope that it would be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
18 *
19 * Further, this software is distributed without any warranty that it
20 * is free of the rightful claim of any third person regarding
21 * infringement or the like. Any license provided herein, whether
22 * implied or otherwise, applies only to this software file. Patent
23 * licenses, if any, provided herein do not apply to combinations of
24 * this program with other software, or any other product whatsoever.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write the Free Software
28 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
29 * 02110-1301, USA.
30 */
31 #include <sys/types.h>
32 #include <sys/stat.h>
33 #include <errno.h>
34 #include <fcntl.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <unistd.h>
38 #include "test.h"
39 #include "mem.h"
40
41 char *TCID = "oom01";
42 int TST_TOTAL = 1;
43
main(int argc,char * argv[])44 int main(int argc, char *argv[])
45 {
46 int lc;
47
48 tst_parse_opts(argc, argv, NULL, NULL);
49
50 #if __WORDSIZE == 32
51 tst_brkm(TCONF, NULL, "test is not designed for 32-bit system.");
52 #endif
53
54 setup();
55
56 for (lc = 0; TEST_LOOPING(lc); lc++) {
57 tst_count = 0;
58
59 /* we expect mmap to fail before OOM is hit */
60 set_sys_tune("overcommit_memory", 2, 1);
61 oom(NORMAL, 0, ENOMEM, 0);
62
63 /* with overcommit_memory set to 0 or 1 there's no
64 * guarantee that mmap fails before OOM */
65 set_sys_tune("overcommit_memory", 0, 1);
66 oom(NORMAL, 0, ENOMEM, 1);
67
68 set_sys_tune("overcommit_memory", 1, 1);
69 testoom(0, 0, ENOMEM, 1);
70 }
71 cleanup();
72 tst_exit();
73 }
74
setup(void)75 void setup(void)
76 {
77 tst_require_root();
78 tst_sig(FORK, DEF_HANDLER, cleanup);
79 TEST_PAUSE;
80
81 overcommit = get_sys_tune("overcommit_memory");
82 }
83
cleanup(void)84 void cleanup(void)
85 {
86 set_sys_tune("overcommit_memory", overcommit, 0);
87 }
88