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 "lapi/abisize.h"
34 #include "numa_helper.h"
35 #include "mem.h"
36
37 #ifdef HAVE_NUMA_V2
38
39 static const struct tst_cgroup_group *cg;
40
verify_oom(void)41 static void verify_oom(void)
42 {
43 #ifdef TST_ABI32
44 tst_brk(TCONF, "test is not designed for 32-bit system.");
45 #endif
46
47 tst_res(TINFO, "OOM on CPUSET & MEMCG...");
48 testoom(0, 0, ENOMEM, 1);
49
50 /*
51 * Under NUMA system, the migration of cpuset's memory
52 * is in charge of cpuset.memory_migrate, we can write
53 * 1 to cpuset.memory_migrate to enable the migration.
54 */
55 if (is_numa(NULL, NH_MEMS, 2) &&
56 SAFE_CGROUP_HAS(cg, "cpuset.memory_migrate")) {
57 SAFE_CGROUP_PRINT(cg, "cpuset.memory_migrate", "1");
58 tst_res(TINFO, "OOM on CPUSET & MEMCG with "
59 "cpuset.memory_migrate=1");
60 testoom(0, 0, ENOMEM, 1);
61 }
62
63 if (SAFE_CGROUP_HAS(cg, "memory.swap.max")) {
64 tst_res(TINFO, "OOM on CPUSET & MEMCG with "
65 "special memswap limitation:");
66 SAFE_CGROUP_PRINTF(cg, "memory.swap.max", "%lu", TESTMEM);
67 testoom(0, 0, ENOMEM, 1);
68
69 tst_res(TINFO, "OOM on CPUSET & MEMCG with "
70 "disabled memswap limitation:");
71 if (TST_CGROUP_VER(cg, "memory") == TST_CGROUP_V1)
72 SAFE_CGROUP_PRINTF(cg, "memory.swap.max", "%lu", ~0UL);
73 else
74 SAFE_CGROUP_PRINT(cg, "memory.swap.max", "max");
75 testoom(0, 0, ENOMEM, 1);
76 }
77 }
78
setup(void)79 void setup(void)
80 {
81 int ret, memnode;
82
83 if (!is_numa(NULL, NH_MEMS, 1))
84 tst_brk(TCONF, "requires NUMA with at least 1 node");
85
86 overcommit = get_sys_tune("overcommit_memory");
87 set_sys_tune("overcommit_memory", 1, 1);
88
89 tst_cgroup_require("memory", NULL);
90 tst_cgroup_require("cpuset", NULL);
91 cg = tst_cgroup_get_test_group();
92
93 /*
94 * Some nodes do not contain memory, so use
95 * get_allowed_nodes(NH_MEMS) to get a memory
96 * node. This operation also applies to Non-NUMA
97 * systems.
98 */
99 ret = get_allowed_nodes(NH_MEMS, 1, &memnode);
100 if (ret < 0)
101 tst_brk(TBROK, "Failed to get a memory node "
102 "using get_allowed_nodes()");
103
104 write_cpusets(cg, memnode);
105 SAFE_CGROUP_PRINTF(cg, "cgroup.procs", "%d", getpid());
106 SAFE_CGROUP_PRINTF(cg, "memory.max", "%lu", TESTMEM);
107 }
108
cleanup(void)109 void cleanup(void)
110 {
111 if (overcommit != -1)
112 set_sys_tune("overcommit_memory", overcommit, 0);
113 tst_cgroup_cleanup();
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(NUMA_ERROR_MSG);
127 #endif
128