107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
/*
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* Copyright (C) 2013-2017 Red Hat, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*/
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/*
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* The case is designed to test new sysfs boolean knob
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* /sys/kernel/mm/ksm/merge_across_nodes, which was introduced by
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* commit 90bd6fd31c8097ee (ksm: allow trees per NUMA node).
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* when merge_across_nodes is set to zero only pages from the same
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* node are merged, otherwise pages from all nodes can be merged
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* together.
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*/
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#include "config.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <limits.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <limits.h>
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#include "mem.h"
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#include "numa_helper.h"
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#ifdef HAVE_NUMA_V2
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#include <numaif.h>
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static int run = -1;
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static int sleep_millisecs = -1;
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static int merge_across_nodes = -1;
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static unsigned long nr_pages;
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static char *n_opt;
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static void test_ksm(void)
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{
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if (n_opt)
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nr_pages = SAFE_STRTOUL(n_opt, 0, ULONG_MAX);
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else
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nr_pages = 100;
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test_ksm_merge_across_nodes(nr_pages);
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}
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static void setup(void)
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{
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if (access(PATH_KSM "merge_across_nodes", F_OK) == -1)
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tst_brk(TCONF, "no merge_across_nodes sysfs knob");
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if (!is_numa(NULL, NH_MEMS, 2))
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tst_brk(TCONF, "The case needs a NUMA system.");
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/* save the current value */
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SAFE_FILE_SCANF(PATH_KSM "run", "%d", &run);
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SAFE_FILE_SCANF(PATH_KSM "merge_across_nodes",
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"%d", &merge_across_nodes);
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SAFE_FILE_SCANF(PATH_KSM "sleep_millisecs",
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"%d", &sleep_millisecs);
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}
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static void cleanup(void)
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{
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if (merge_across_nodes != -1) {
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FILE_PRINTF(PATH_KSM "merge_across_nodes",
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"%d", merge_across_nodes);
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}
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if (sleep_millisecs != -1)
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FILE_PRINTF(PATH_KSM "sleep_millisecs", "%d", sleep_millisecs);
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if (run != -1)
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FILE_PRINTF(PATH_KSM "run", "%d", run);
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}
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static struct tst_test test = {
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.needs_root = 1,
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.options = (struct tst_option[]) {
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{"n:", &n_opt, "-n x Allocate x pages memory per node"},
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{}
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},
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.setup = setup,
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.cleanup = cleanup,
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.save_restore = (const char * const[]) {
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"?/sys/kernel/mm/ksm/max_page_sharing",
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NULL,
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},
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.test_all = test_ksm,
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};
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#else
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TST_TEST_TCONF(NUMA_ERROR_MSG);
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#endif
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