| /* |
| * Kernel Samepage Merging (KSM) for Memory Resource Controller and NUMA |
| * |
| * Basic tests were to start several programs with same and different |
| * memory contents and ensure only to merge the ones with the same |
| * contents. When changed the content of one of merged pages in a |
| * process and to the mode "unmerging", it should discard all merged |
| * pages there. Also tested it is possible to disable KSM. There are |
| * also command-line options to specify the memory allocation size, and |
| * number of processes have same memory contents so it is possible to |
| * test more advanced things like KSM + OOM etc. |
| * |
| * Prerequisites: |
| * |
| * 1) ksm and ksmtuned daemons need to be disabled. Otherwise, it could |
| * distrub the testing as they also change some ksm tunables depends |
| * on current workloads. |
| * |
| * The test steps are: |
| * - Check ksm feature and backup current run setting. |
| * - Change run setting to 1 - merging. |
| * - 3 memory allocation programs have the memory contents that 2 of |
| * them are all 'a' and one is all 'b'. |
| * - Check ksm statistics and verify the content. |
| * - 1 program changes the memory content from all 'a' to all 'b'. |
| * - Check ksm statistics and verify the content. |
| * - All programs change the memory content to all 'd'. |
| * - Check ksm statistics and verify the content. |
| * - Change one page of a process. |
| * - Check ksm statistics and verify the content. |
| * - Change run setting to 2 - unmerging. |
| * - Check ksm statistics and verify the content. |
| * - Change run setting to 0 - stop. |
| * |
| * Copyright (C) 2010 Red Hat, Inc. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of version 2 of the GNU General Public |
| * License as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it would be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| * |
| * Further, this software is distributed without any warranty that it |
| * is free of the rightful claim of any third person regarding |
| * infringement or the like. Any license provided herein, whether |
| * implied or otherwise, applies only to this software file. Patent |
| * licenses, if any, provided herein do not apply to combinations of |
| * this program with other software, or any other product whatsoever. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| * 02110-1301, USA. |
| */ |
| |
| #include "config.h" |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #if HAVE_NUMAIF_H |
| #include <numaif.h> |
| #endif |
| #include <signal.h> |
| #include <stdio.h> |
| #include <unistd.h> |
| #include "test.h" |
| #include "mem.h" |
| |
| char *TCID = "ksm04"; |
| int TST_TOTAL = 1; |
| |
| static int merge_across_nodes; |
| |
| #if HAVE_NUMA_H && HAVE_LINUX_MEMPOLICY_H && HAVE_NUMAIF_H \ |
| && HAVE_MPOL_CONSTANTS |
| option_t ksm_options[] = { |
| {"n:", &opt_num, &opt_numstr}, |
| {"s:", &opt_size, &opt_sizestr}, |
| {"u:", &opt_unit, &opt_unitstr}, |
| {NULL, NULL, NULL} |
| }; |
| |
| int main(int argc, char *argv[]) |
| { |
| int lc; |
| const char *msg; |
| int size = 128, num = 3, unit = 1; |
| unsigned long nmask[MAXNODES / BITS_PER_LONG] = { 0 }; |
| unsigned int node; |
| |
| msg = parse_opts(argc, argv, ksm_options, ksm_usage); |
| if (msg != NULL) |
| tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); |
| |
| node = get_a_numa_node(tst_exit); |
| set_node(nmask, node); |
| |
| setup(); |
| |
| for (lc = 0; TEST_LOOPING(lc); lc++) { |
| tst_count = 0; |
| check_ksm_options(&size, &num, &unit); |
| |
| write_memcg(); |
| |
| if (set_mempolicy(MPOL_BIND, nmask, MAXNODES) == -1) { |
| if (errno != ENOSYS) |
| tst_brkm(TBROK | TERRNO, cleanup, |
| "set_mempolicy"); |
| else |
| tst_brkm(TCONF, cleanup, |
| "set_mempolicy syscall is not " |
| "implemented on your system."); |
| } |
| create_same_memory(size, num, unit); |
| |
| write_cpusets(node); |
| create_same_memory(size, num, unit); |
| } |
| cleanup(); |
| tst_exit(); |
| } |
| |
| void cleanup(void) |
| { |
| if (access(PATH_KSM "merge_across_nodes", F_OK) == 0) |
| FILE_PRINTF(PATH_KSM "merge_across_nodes", |
| "%d", merge_across_nodes); |
| |
| umount_mem(CPATH, CPATH_NEW); |
| umount_mem(MEMCG_PATH, MEMCG_PATH_NEW); |
| } |
| |
| void setup(void) |
| { |
| tst_require_root(NULL); |
| |
| if (tst_kvercmp(2, 6, 32) < 0) |
| tst_brkm(TCONF, NULL, "2.6.32 or greater kernel required"); |
| if (access(PATH_KSM, F_OK) == -1) |
| tst_brkm(TCONF, NULL, "KSM configuration is not enabled"); |
| |
| if (access(PATH_KSM "merge_across_nodes", F_OK) == 0) { |
| SAFE_FILE_SCANF(NULL, PATH_KSM "merge_across_nodes", |
| "%d", &merge_across_nodes); |
| SAFE_FILE_PRINTF(NULL, PATH_KSM "merge_across_nodes", "1"); |
| } |
| |
| tst_sig(FORK, DEF_HANDLER, cleanup); |
| TEST_PAUSE; |
| mount_mem("cpuset", "cpuset", NULL, CPATH, CPATH_NEW); |
| mount_mem("memcg", "cgroup", "memory", MEMCG_PATH, MEMCG_PATH_NEW); |
| } |
| |
| #else /* no NUMA */ |
| int main(void) |
| { |
| tst_brkm(TCONF, NULL, "no NUMA development packages installed."); |
| } |
| #endif |