1 /* 2 * Kernel Samepage Merging (KSM) for Memory Resource Controller and NUMA 3 * 4 * Basic tests were to start several programs with same and different 5 * memory contents and ensure only to merge the ones with the same 6 * contents. When changed the content of one of merged pages in a 7 * process and to the mode "unmerging", it should discard all merged 8 * pages there. Also tested it is possible to disable KSM. There are 9 * also command-line options to specify the memory allocation size, and 10 * number of processes have same memory contents so it is possible to 11 * test more advanced things like KSM + OOM etc. 12 * 13 * Prerequisites: 14 * 15 * 1) ksm and ksmtuned daemons need to be disabled. Otherwise, it could 16 * distrub the testing as they also change some ksm tunables depends 17 * on current workloads. 18 * 19 * The test steps are: 20 * - Check ksm feature and backup current run setting. 21 * - Change run setting to 1 - merging. 22 * - 3 memory allocation programs have the memory contents that 2 of 23 * them are all 'a' and one is all 'b'. 24 * - Check ksm statistics and verify the content. 25 * - 1 program changes the memory content from all 'a' to all 'b'. 26 * - Check ksm statistics and verify the content. 27 * - All programs change the memory content to all 'd'. 28 * - Check ksm statistics and verify the content. 29 * - Change one page of a process. 30 * - Check ksm statistics and verify the content. 31 * - Change run setting to 2 - unmerging. 32 * - Check ksm statistics and verify the content. 33 * - Change run setting to 0 - stop. 34 * 35 * Copyright (C) 2010 Red Hat, Inc. 36 * 37 * This program is free software; you can redistribute it and/or 38 * modify it under the terms of version 2 of the GNU General Public 39 * License as published by the Free Software Foundation. 40 * 41 * This program is distributed in the hope that it would be useful, 42 * but WITHOUT ANY WARRANTY; without even the implied warranty of 43 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 44 * 45 * Further, this software is distributed without any warranty that it 46 * is free of the rightful claim of any third person regarding 47 * infringement or the like. Any license provided herein, whether 48 * implied or otherwise, applies only to this software file. Patent 49 * licenses, if any, provided herein do not apply to combinations of 50 * this program with other software, or any other product whatsoever. 51 * 52 * You should have received a copy of the GNU General Public License 53 * along with this program; if not, write the Free Software 54 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 55 * 02110-1301, USA. 56 */ 57 58 #include "config.h" 59 #include <sys/types.h> 60 #include <sys/stat.h> 61 #include <errno.h> 62 #include <fcntl.h> 63 #if HAVE_NUMAIF_H 64 #include <numaif.h> 65 #endif 66 #include <signal.h> 67 #include <stdio.h> 68 #include <unistd.h> 69 #include "test.h" 70 #include "mem.h" 71 72 char *TCID = "ksm04"; 73 int TST_TOTAL = 1; 74 75 static int merge_across_nodes; 76 77 #if HAVE_NUMA_H && HAVE_LINUX_MEMPOLICY_H && HAVE_NUMAIF_H \ 78 && HAVE_MPOL_CONSTANTS 79 option_t ksm_options[] = { 80 {"n:", &opt_num, &opt_numstr}, 81 {"s:", &opt_size, &opt_sizestr}, 82 {"u:", &opt_unit, &opt_unitstr}, 83 {NULL, NULL, NULL} 84 }; 85 86 int main(int argc, char *argv[]) 87 { 88 int lc; 89 int size = 128, num = 3, unit = 1; 90 unsigned long nmask[MAXNODES / BITS_PER_LONG] = { 0 }; 91 unsigned int node; 92 93 tst_parse_opts(argc, argv, ksm_options, ksm_usage); 94 95 node = get_a_numa_node(tst_exit); 96 set_node(nmask, node); 97 98 setup(); 99 100 for (lc = 0; TEST_LOOPING(lc); lc++) { 101 tst_count = 0; 102 check_ksm_options(&size, &num, &unit); 103 104 write_memcg(); 105 106 if (set_mempolicy(MPOL_BIND, nmask, MAXNODES) == -1) { 107 if (errno != ENOSYS) 108 tst_brkm(TBROK | TERRNO, cleanup, 109 "set_mempolicy"); 110 else 111 tst_brkm(TCONF, cleanup, 112 "set_mempolicy syscall is not " 113 "implemented on your system."); 114 } 115 create_same_memory(size, num, unit); 116 117 write_cpusets(node); 118 create_same_memory(size, num, unit); 119 } 120 cleanup(); 121 tst_exit(); 122 } 123 124 void cleanup(void) 125 { 126 if (access(PATH_KSM "merge_across_nodes", F_OK) == 0) 127 FILE_PRINTF(PATH_KSM "merge_across_nodes", 128 "%d", merge_across_nodes); 129 130 restore_max_page_sharing(); 131 132 umount_mem(CPATH, CPATH_NEW); 133 umount_mem(MEMCG_PATH, MEMCG_PATH_NEW); 134 } 135 136 void setup(void) 137 { 138 tst_require_root(); 139 140 if (tst_kvercmp(2, 6, 32) < 0) 141 tst_brkm(TCONF, NULL, "2.6.32 or greater kernel required"); 142 if (access(PATH_KSM, F_OK) == -1) 143 tst_brkm(TCONF, NULL, "KSM configuration is not enabled"); 144 145 if (access(PATH_KSM "merge_across_nodes", F_OK) == 0) { 146 SAFE_FILE_SCANF(NULL, PATH_KSM "merge_across_nodes", 147 "%d", &merge_across_nodes); 148 SAFE_FILE_PRINTF(NULL, PATH_KSM "merge_across_nodes", "1"); 149 } 150 151 save_max_page_sharing(); 152 153 tst_sig(FORK, DEF_HANDLER, cleanup); 154 TEST_PAUSE; 155 mount_mem("cpuset", "cpuset", NULL, CPATH, CPATH_NEW); 156 mount_mem("memcg", "cgroup", "memory", MEMCG_PATH, MEMCG_PATH_NEW); 157 } 158 159 #else /* no NUMA */ 160 int main(void) 161 { 162 tst_brkm(TCONF, NULL, "no NUMA development packages installed."); 163 } 164 #endif 165
