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
verify_oom(void)39 static void verify_oom(void)
40 {
41 #ifdef TST_ABI32
42 tst_brk(TCONF, "test is not designed for 32-bit system.");
43 #endif
44
45 tst_res(TINFO, "OOM on CPUSET & MEMCG...");
46 testoom(0, 0, ENOMEM, 1);
47
48 /*
49 * Under NUMA system, the migration of cpuset's memory
50 * is in charge of cpuset.memory_migrate, we can write
51 * 1 to cpuset.memory_migrate to enable the migration.
52 */
53 if (is_numa(NULL, NH_MEMS, 2) &&
54 SAFE_CG_HAS(tst_cg, "cpuset.memory_migrate")) {
55 SAFE_CG_PRINT(tst_cg, "cpuset.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 (SAFE_CG_HAS(tst_cg, "memory.swap.max")) {
62 tst_res(TINFO, "OOM on CPUSET & MEMCG with "
63 "special memswap limitation:");
64 if (!TST_CG_VER_IS_V1(tst_cg, "memory"))
65 SAFE_CG_PRINTF(tst_cg, "memory.swap.max", "%lu", MB);
66 else
67 SAFE_CG_PRINTF(tst_cg, "memory.swap.max", "%lu", TESTMEM + MB);
68
69 testoom(0, 1, ENOMEM, 1);
70
71 tst_res(TINFO, "OOM on CPUSET & MEMCG with "
72 "disabled memswap limitation:");
73 if (TST_CG_VER_IS_V1(tst_cg, "memory"))
74 SAFE_CG_PRINTF(tst_cg, "memory.swap.max", "%lu", ~0UL);
75 else
76 SAFE_CG_PRINT(tst_cg, "memory.swap.max", "max");
77 testoom(0, 0, ENOMEM, 1);
78 }
79 }
80
setup(void)81 void setup(void)
82 {
83 int ret, memnode;
84
85 if (!is_numa(NULL, NH_MEMS, 1))
86 tst_brk(TCONF, "requires NUMA with at least 1 node");
87
88 overcommit = get_sys_tune("overcommit_memory");
89 set_sys_tune("overcommit_memory", 1, 1);
90
91 /*
92 * Some nodes do not contain memory, so use
93 * get_allowed_nodes(NH_MEMS) to get a memory
94 * node. This operation also applies to Non-NUMA
95 * systems.
96 */
97 ret = get_allowed_nodes(NH_MEMS, 1, &memnode);
98 if (ret < 0)
99 tst_brk(TBROK, "Failed to get a memory node "
100 "using get_allowed_nodes()");
101
102 write_cpusets(tst_cg, memnode);
103 SAFE_CG_PRINTF(tst_cg, "cgroup.procs", "%d", getpid());
104 SAFE_CG_PRINTF(tst_cg, "memory.max", "%lu", TESTMEM);
105 }
106
cleanup(void)107 void cleanup(void)
108 {
109 if (overcommit != -1)
110 set_sys_tune("overcommit_memory", overcommit, 0);
111 }
112
113 static struct tst_test test = {
114 .needs_root = 1,
115 .forks_child = 1,
116 .max_runtime = TST_UNLIMITED_RUNTIME,
117 .setup = setup,
118 .cleanup = cleanup,
119 .test_all = verify_oom,
120 .needs_cgroup_ctrls = (const char *const []){
121 "memory", "cpuset", NULL
122 },
123 };
124
125 #else
126 TST_TEST_TCONF(NUMA_ERROR_MSG);
127 #endif
128