1 /* 2 * Copyright (C) 2013 Linux Test Project 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of version 2 of the GNU General Public 6 * License as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it would be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 11 * 12 * Further, this software is distributed without any warranty that it 13 * is free of the rightful claim of any third person regarding 14 * infringement or the like. Any license provided herein, whether 15 * implied or otherwise, applies only to this software file. Patent 16 * licenses, if any, provided herein do not apply to combinations of 17 * this program with other software, or any other product whatsoever. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write the Free Software 21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 22 * 02110-1301, USA. 23 */ 24 25 /* 26 * The case is designed to test new sysfs boolean knob 27 * /sys/kernel/mm/ksm/merge_across_nodes, which was introduced by 28 * commit 90bd6fd31c8097ee (ksm: allow trees per NUMA node). 29 * when merge_across_nodes is set to zero only pages from the same 30 * node are merged, otherwise pages from all nodes can be merged 31 * together. 32 */ 33 34 #include "config.h" 35 #include <sys/types.h> 36 #include <sys/stat.h> 37 #include <sys/mman.h> 38 #include <errno.h> 39 #include <fcntl.h> 40 #if HAVE_NUMAIF_H 41 #include <numaif.h> 42 #endif 43 #include <signal.h> 44 #include <stdio.h> 45 #include <unistd.h> 46 #include "numa_helper.h" 47 #include "test.h" 48 #include "safe_macros.h" 49 #include "mem.h" 50 51 char *TCID = "ksm06"; 52 int TST_TOTAL = 1; 53 54 #if HAVE_NUMA_H && HAVE_LINUX_MEMPOLICY_H && HAVE_NUMAIF_H \ 55 && HAVE_MPOL_CONSTANTS 56 57 static int run; 58 static int sleep_millisecs; 59 static int merge_across_nodes; 60 static int n_flag; 61 static unsigned long nr_pages; 62 63 static char *n_opt; 64 option_t options[] = { 65 { "n:", &n_flag, &n_opt }, 66 { NULL, NULL, NULL } 67 }; 68 static void usage(void); 69 70 int main(int argc, char *argv[]) 71 { 72 int lc; 73 74 tst_parse_opts(argc, argv, options, &usage); 75 76 if (n_flag) 77 nr_pages = SAFE_STRTOUL(NULL, n_opt, 0, ULONG_MAX); 78 else 79 nr_pages = 100; 80 81 setup(); 82 83 for (lc = 0; TEST_LOOPING(lc); lc++) { 84 tst_count = 0; 85 86 test_ksm_merge_across_nodes(nr_pages); 87 } 88 89 cleanup(); 90 tst_exit(); 91 } 92 93 void setup(void) 94 { 95 if (access(PATH_KSM "merge_across_nodes", F_OK) == -1) 96 tst_brkm(TCONF, NULL, "no merge_across_nodes sysfs knob"); 97 98 if (!is_numa(NULL, NH_MEMS, 2)) 99 tst_brkm(TCONF, NULL, "The case needs a NUMA system."); 100 101 /* save the current value */ 102 SAFE_FILE_SCANF(NULL, PATH_KSM "run", "%d", &run); 103 SAFE_FILE_SCANF(NULL, PATH_KSM "merge_across_nodes", 104 "%d", &merge_across_nodes); 105 SAFE_FILE_SCANF(NULL, PATH_KSM "sleep_millisecs", 106 "%d", &sleep_millisecs); 107 108 save_max_page_sharing(); 109 110 tst_sig(FORK, DEF_HANDLER, cleanup); 111 TEST_PAUSE; 112 } 113 114 void cleanup(void) 115 { 116 FILE_PRINTF(PATH_KSM "merge_across_nodes", 117 "%d", merge_across_nodes); 118 FILE_PRINTF(PATH_KSM "sleep_millisecs", 119 "%d", sleep_millisecs); 120 FILE_PRINTF(PATH_KSM "run", "%d", run); 121 122 restore_max_page_sharing(); 123 } 124 125 static void usage(void) 126 { 127 printf(" -n x Allocate x pages memory per node\n"); 128 } 129 130 #else /* no NUMA */ 131 int main(void) 132 { 133 tst_brkm(TCONF, NULL, "no NUMA development packages installed."); 134 } 135 #endif 136
