1 /*
2 * Out Of Memory (OOM) for MEMCG and CPUSET
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) 2013-2017 Red Hat, Inc.
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
20 * the GNU General Public License for more details.
21 */
22
23 #include "config.h"
24 #include <sys/types.h>
25 #include <sys/stat.h>
26 #include <errno.h>
27 #include <fcntl.h>
28 #include <stdio.h>
29 #if HAVE_NUMA_H
30 #include <numa.h>
31 #endif
32
33 #include "numa_helper.h"
34 #include "mem.h"
35
36 #ifdef HAVE_NUMA_V2
37
verify_oom(void)38 static void verify_oom(void)
39 {
40 int swap_acc_on = 1;
41
42 #if __WORDSIZE == 32
43 tst_brk(TCONF, "test is not designed for 32-bit system.");
44 #endif
45
46 tst_res(TINFO, "OOM on CPUSET & MEMCG...");
47 testoom(0, 0, ENOMEM, 1);
48
49 /*
50 * Under NUMA system, the migration of cpuset's memory
51 * is in charge of cpuset.memory_migrate, we can write
52 * 1 to cpuset.memory_migrate to enable the migration.
53 */
54 if (is_numa(NULL, NH_MEMS, 2)) {
55 write_cpuset_files(CPATH_NEW, "memory_migrate", "1");
56 tst_res(TINFO, "OOM on CPUSET & MEMCG with "
57 "cpuset.memory_migrate=1");
58 testoom(0, 0, ENOMEM, 1);
59 }
60
61 if (access(MEMCG_SW_LIMIT, F_OK) == -1) {
62 if (errno == ENOENT) {
63 tst_res(TCONF, "memcg swap accounting is disabled");
64 swap_acc_on = 0;
65 } else
66 tst_brk(TBROK|TERRNO, "access");
67 }
68
69 if (swap_acc_on) {
70 tst_res(TINFO, "OOM on CPUSET & MEMCG with "
71 "special memswap limitation:");
72 SAFE_FILE_PRINTF(MEMCG_SW_LIMIT, "%ld", TESTMEM);
73 testoom(0, 0, ENOMEM, 1);
74
75 tst_res(TINFO, "OOM on CPUSET & MEMCG with "
76 "disabled memswap limitation:");
77 SAFE_FILE_PRINTF(MEMCG_SW_LIMIT, "-1");
78 testoom(0, 0, ENOMEM, 1);
79 }
80 }
81
setup(void)82 void setup(void)
83 {
84 int ret, memnode;
85
86 if (!is_numa(NULL, NH_MEMS, 1))
87 tst_brk(TCONF, "requires NUMA with at least 1 node");
88
89 overcommit = get_sys_tune("overcommit_memory");
90 set_sys_tune("overcommit_memory", 1, 1);
91
92 mount_mem("memcg", "cgroup", "memory", MEMCG_PATH, MEMCG_PATH_NEW);
93 mount_mem("cpuset", "cpuset", NULL, CPATH, CPATH_NEW);
94 write_memcg();
95
96 /*
97 * Some nodes do not contain memory, so use
98 * get_allowed_nodes(NH_MEMS) to get a memory
99 * node. This operation also applies to Non-NUMA
100 * systems.
101 */
102 ret = get_allowed_nodes(NH_MEMS, 1, &memnode);
103 if (ret < 0)
104 tst_brk(TBROK, "Failed to get a memory node "
105 "using get_allowed_nodes()");
106 write_cpusets(memnode);
107 }
108
cleanup(void)109 void cleanup(void)
110 {
111 set_sys_tune("overcommit_memory", overcommit, 0);
112 umount_mem(CPATH, CPATH_NEW);
113 umount_mem(MEMCG_PATH, MEMCG_PATH_NEW);
114 }
115
116 static struct tst_test test = {
117 .needs_root = 1,
118 .forks_child = 1,
119 .timeout = -1,
120 .setup = setup,
121 .cleanup = cleanup,
122 .test_all = verify_oom,
123 };
124
125 #else
126 TST_TEST_TCONF("test requires libnuma >= 2 and it's development packages");
127 #endif
128