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 if (!TST_CGROUP_VER_IS_V1(cg, "memory"))
67 SAFE_CGROUP_PRINTF(cg, "memory.swap.max", "%lu", MB);
68 else
69 SAFE_CGROUP_PRINTF(cg, "memory.swap.max", "%lu", TESTMEM + MB);
70
71 testoom(0, 1, ENOMEM, 1);
72
73 tst_res(TINFO, "OOM on CPUSET & MEMCG with "
74 "disabled memswap limitation:");
75 if (TST_CGROUP_VER_IS_V1(cg, "memory"))
76 SAFE_CGROUP_PRINTF(cg, "memory.swap.max", "%lu", ~0UL);
77 else
78 SAFE_CGROUP_PRINT(cg, "memory.swap.max", "max");
79 testoom(0, 0, ENOMEM, 1);
80 }
81 }
82
setup(void)83 void setup(void)
84 {
85 int ret, memnode;
86
87 if (!is_numa(NULL, NH_MEMS, 1))
88 tst_brk(TCONF, "requires NUMA with at least 1 node");
89
90 overcommit = get_sys_tune("overcommit_memory");
91 set_sys_tune("overcommit_memory", 1, 1);
92
93 tst_cgroup_require("memory", NULL);
94 tst_cgroup_require("cpuset", NULL);
95 cg = tst_cgroup_get_test_group();
96
97 /*
98 * Some nodes do not contain memory, so use
99 * get_allowed_nodes(NH_MEMS) to get a memory
100 * node. This operation also applies to Non-NUMA
101 * systems.
102 */
103 ret = get_allowed_nodes(NH_MEMS, 1, &memnode);
104 if (ret < 0)
105 tst_brk(TBROK, "Failed to get a memory node "
106 "using get_allowed_nodes()");
107
108 write_cpusets(cg, memnode);
109 SAFE_CGROUP_PRINTF(cg, "cgroup.procs", "%d", getpid());
110 SAFE_CGROUP_PRINTF(cg, "memory.max", "%lu", TESTMEM);
111 }
112
cleanup(void)113 void cleanup(void)
114 {
115 if (overcommit != -1)
116 set_sys_tune("overcommit_memory", overcommit, 0);
117 tst_cgroup_cleanup();
118 }
119
120 static struct tst_test test = {
121 .needs_root = 1,
122 .forks_child = 1,
123 .timeout = -1,
124 .setup = setup,
125 .cleanup = cleanup,
126 .test_all = verify_oom,
127 };
128
129 #else
130 TST_TEST_TCONF(NUMA_ERROR_MSG);
131 #endif
132