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 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 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 84 void cleanup(void) 85 { 86 set_sys_tune("overcommit_memory", overcommit, 0); 87 } 88
