| /* |
| * Copyright (C) 2013 Linux Test Project |
| * |
| * 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. |
| */ |
| |
| /* |
| * The case is designed to test new sysfs boolean knob |
| * /sys/kernel/mm/ksm/merge_across_nodes, which was introduced by |
| * commit 90bd6fd31c8097ee (ksm: allow trees per NUMA node). |
| * when merge_across_nodes is set to zero only pages from the same |
| * node are merged, otherwise pages from all nodes can be merged |
| * together. |
| */ |
| |
| #include "config.h" |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <sys/mman.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 "numa_helper.h" |
| #include "test.h" |
| #include "safe_macros.h" |
| #include "mem.h" |
| |
| char *TCID = "ksm06"; |
| int TST_TOTAL = 1; |
| |
| #if HAVE_NUMA_H && HAVE_LINUX_MEMPOLICY_H && HAVE_NUMAIF_H \ |
| && HAVE_MPOL_CONSTANTS |
| |
| static int run; |
| static int sleep_millisecs; |
| static int merge_across_nodes; |
| static int n_flag; |
| static unsigned long nr_pages; |
| |
| static char *n_opt; |
| option_t options[] = { |
| { "n:", &n_flag, &n_opt }, |
| { NULL, NULL, NULL } |
| }; |
| static void usage(void); |
| |
| int main(int argc, char *argv[]) |
| { |
| int lc; |
| const char *msg; |
| |
| msg = parse_opts(argc, argv, options, &usage); |
| if (msg != NULL) |
| tst_brkm(TBROK, NULL, "OPTION PASING ERROR - %s", msg); |
| if (n_flag) |
| nr_pages = SAFE_STRTOUL(NULL, n_opt, 0, ULONG_MAX); |
| else |
| nr_pages = 100; |
| |
| setup(); |
| |
| for (lc = 0; TEST_LOOPING(lc); lc++) { |
| tst_count = 0; |
| |
| test_ksm_merge_across_nodes(nr_pages); |
| } |
| |
| cleanup(); |
| tst_exit(); |
| } |
| |
| void setup(void) |
| { |
| if (access(PATH_KSM "merge_across_nodes", F_OK) == -1) |
| tst_brkm(TCONF, NULL, "no merge_across_nodes sysfs knob"); |
| |
| if (!is_numa(NULL)) |
| tst_brkm(TCONF, NULL, "The case need a NUMA system."); |
| |
| /* save the current value */ |
| SAFE_FILE_SCANF(NULL, PATH_KSM "run", "%d", &run); |
| SAFE_FILE_SCANF(NULL, PATH_KSM "merge_across_nodes", |
| "%d", &merge_across_nodes); |
| SAFE_FILE_SCANF(NULL, PATH_KSM "sleep_millisecs", |
| "%d", &sleep_millisecs); |
| |
| tst_sig(FORK, DEF_HANDLER, cleanup); |
| TEST_PAUSE; |
| } |
| |
| void cleanup(void) |
| { |
| FILE_PRINTF(PATH_KSM "merge_across_nodes", |
| "%d", merge_across_nodes); |
| FILE_PRINTF(PATH_KSM "sleep_millisecs", |
| "%d", sleep_millisecs); |
| FILE_PRINTF(PATH_KSM "run", "%d", run); |
| } |
| |
| static void usage(void) |
| { |
| printf(" -n x Allocate x pages memory per node\n"); |
| } |
| |
| #else /* no NUMA */ |
| int main(void) |
| { |
| tst_brkm(TCONF, NULL, "no NUMA development packages installed."); |
| } |
| #endif |