/*
* Copyright (C) 2013-2017 Red Hat, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*/
/*
* 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 <limits.h>
#include <errno.h>
#include <fcntl.h>
#if HAVE_NUMA_H
#include <numa.h>
#endif
#if HAVE_NUMAIF_H
#include <numaif.h>
#endif
#include <signal.h>
#include <stdio.h>
#include <unistd.h>
#include <limits.h>
#include "mem.h"
#include "numa_helper.h"
#if defined(HAVE_NUMA_V2) && defined(HAVE_LINUX_MEMPOLICY_H)
static int run = -1;
static int sleep_millisecs = -1;
static int merge_across_nodes = -1;
static unsigned long nr_pages;
static char *n_opt;
static struct tst_option ksm_options[] = {
{"n:", &n_opt, "-n x Allocate x pages memory per node"},
{NULL, NULL, NULL}
};
static void test_ksm(void)
{
if (n_opt)
nr_pages = SAFE_STRTOUL(n_opt, 0, ULONG_MAX);
else
nr_pages = 100;
test_ksm_merge_across_nodes(nr_pages);
}
static void setup(void)
{
if (access(PATH_KSM "merge_across_nodes", F_OK) == -1)
tst_brk(TCONF, "no merge_across_nodes sysfs knob");
save_max_page_sharing();
if (!is_numa(NULL, NH_MEMS, 2))
tst_brk(TCONF, "The case needs a NUMA system.");
/* save the current value */
SAFE_FILE_SCANF(PATH_KSM "run", "%d", &run);
SAFE_FILE_SCANF(PATH_KSM "merge_across_nodes",
"%d", &merge_across_nodes);
SAFE_FILE_SCANF(PATH_KSM "sleep_millisecs",
"%d", &sleep_millisecs);
}
static void cleanup(void)
{
if (merge_across_nodes != -1) {
FILE_PRINTF(PATH_KSM "merge_across_nodes",
"%d", merge_across_nodes);
}
if (sleep_millisecs != -1)
FILE_PRINTF(PATH_KSM "sleep_millisecs", "%d", sleep_millisecs);
if (run != -1)
FILE_PRINTF(PATH_KSM "run", "%d", run);
restore_max_page_sharing();
}
static struct tst_test test = {
.needs_root = 1,
.options = ksm_options,
.setup = setup,
.cleanup = cleanup,
.test_all = test_ksm,
};
#else
TST_TEST_TCONF("test requires libnuma >= 2 and it's development packages");
#endif