128 lines
3.9 KiB
C
128 lines
3.9 KiB
C
/*
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* Copyright (C) 2010-2017 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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* Kernel Samepage Merging (KSM) for Memory Resource Controller and NUMA
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*
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* Basic tests were to start several programs with same and different
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* memory contents and ensure only to merge the ones with the same
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* contents. When changed the content of one of merged pages in a
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* process and to the mode "unmerging", it should discard all merged
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* pages there. Also tested it is possible to disable KSM. There are
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* also command-line options to specify the memory allocation size, and
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* number of processes have same memory contents so it is possible to
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* test more advanced things like KSM + OOM etc.
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*
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* Prerequisites:
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*
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* 1) ksm and ksmtuned daemons need to be disabled. Otherwise, it could
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* distrub the testing as they also change some ksm tunables depends
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* on current workloads.
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*
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* The test steps are:
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* - Check ksm feature and backup current run setting.
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* - Change run setting to 1 - merging.
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* - 3 memory allocation programs have the memory contents that 2 of
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* them are all 'a' and one is all 'b'.
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* - Check ksm statistics and verify the content.
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* - 1 program changes the memory content from all 'a' to all 'b'.
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* - Check ksm statistics and verify the content.
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* - All programs change the memory content to all 'd'.
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* - Check ksm statistics and verify the content.
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* - Change one page of a process.
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* - Check ksm statistics and verify the content.
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* - Change run setting to 2 - unmerging.
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* - Check ksm statistics and verify the content.
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* - Change run setting to 0 - stop.
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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 <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 "mem.h"
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#include "ksm_common.h"
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#ifdef HAVE_NUMA_V2
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#include <numaif.h>
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static void verify_ksm(void)
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{
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unsigned long nmask[MAXNODES / BITS_PER_LONG] = { 0 };
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unsigned int node;
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node = get_a_numa_node();
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set_node(nmask, node);
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SAFE_CG_PRINTF(tst_cg, "memory.max", "%lu", TESTMEM);
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if (set_mempolicy(MPOL_BIND, nmask, MAXNODES) == -1) {
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if (errno != ENOSYS)
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tst_brk(TBROK | TERRNO, "set_mempolicy");
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else
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tst_brk(TCONF, "set_mempolicy syscall is not "
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"implemented on your system.");
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}
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create_same_memory(size, num, unit);
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write_cpusets(tst_cg, node);
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create_same_memory(size, num, unit);
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}
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static void setup(void)
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{
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parse_ksm_options(opt_sizestr, &size, opt_numstr, &num, opt_unitstr, &unit);
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SAFE_CG_PRINTF(tst_cg, "cgroup.procs", "%d", getpid());
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if (opt_sizestr && size > DEFAULT_MEMSIZE)
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tst_set_max_runtime(32 * (size / DEFAULT_MEMSIZE));
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}
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static struct tst_test test = {
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.needs_root = 1,
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.forks_child = 1,
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.options = (struct tst_option[]) {
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{"n:", &opt_numstr, "Number of processes"},
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{"s:", &opt_sizestr, "Memory allocation size in MB"},
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{"u:", &opt_unitstr, "Memory allocation unit in MB"},
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{}
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},
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.setup = setup,
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.save_restore = (const struct tst_path_val[]) {
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{"/sys/kernel/mm/ksm/run", NULL, TST_SR_TBROK},
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{"/sys/kernel/mm/ksm/sleep_millisecs", NULL, TST_SR_TBROK},
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{"/sys/kernel/mm/ksm/max_page_sharing", NULL,
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TST_SR_SKIP_MISSING | TST_SR_TCONF_RO},
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{"/sys/kernel/mm/ksm/merge_across_nodes", "1",
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TST_SR_SKIP_MISSING | TST_SR_TCONF_RO},
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{}
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},
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.needs_kconfigs = (const char *const[]){
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"CONFIG_KSM=y",
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NULL
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},
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.test_all = verify_ksm,
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.max_runtime = 32,
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.needs_cgroup_ctrls = (const char *const []){
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"memory", "cpuset", NULL
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},
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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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