158 lines
4.2 KiB
Bash
Executable File
158 lines
4.2 KiB
Bash
Executable File
#!/bin/sh
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#
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# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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#
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# Copyright (c) 2021 Peter Holm <pho@FreeBSD.org>
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# Hunt for https://people.freebsd.org/~pho/stress/log/log0018.txt
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# Test scenario idea by kib@
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# Scenario should be the following (without paging load, so that pages stay
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# resident):
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# - create some large file, say 2G
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# - map it and touch every page to ensure that they all allocated
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# - unmap, and map again, so while the pages are resident, they are not
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# installed into page table
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# Do mincore(2) on the mapped region.
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#
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# The problem was not reproduced.
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. ../default.cfg
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[ `id -u` -ne 0 ] && echo "Must be root!" && exit 1
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[ `sysctl -n vm.swap_total` -eq 0 ] && exit 0
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path=`dirname $diskimage`
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[ `df -k $path | tail -1 | awk '{print int($4 / 1024 / 1024)}'` -lt 4 ] && exit 0
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dir=/tmp
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odir=`pwd`
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cd $dir
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sed '1,/^EOF/d' < $odir/$0 > $dir/mincore.c
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mycc -o mincore -Wall -Wextra -O0 -g mincore.c || exit 1
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rm -f mincore.c
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cd $odir
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(cd ../testcases/swap; ./swap -t 10m -i 20 -l 100) &
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for i in `jot 20`; do
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[ `swapinfo | tail -1 | awk '{gsub("%", ""); print $5}'` -gt 0 ] && break
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sleep 5
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pgrep -q swap || break
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done
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echo "`date +%T` Go"
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$dir/mincore $path; s=$?
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while pkill swap; do :; done
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wait
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rm -rf $dir/mincore
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exit $s
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EOF
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#include <sys/param.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <fcntl.h>
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#include <err.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#define PARALLEL 2
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#define RUNTIME 300
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#define SIZE (2LL * 1024 * 1024 * 1024)
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static void
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test(char *dir)
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{
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size_t i, len;
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int fd;
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char file[128], *p, *vec;
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len = SIZE;
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snprintf(file, sizeof(file), "%s/mincore.%d.file", dir, getpid());
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if ((fd = open(file, O_RDWR | O_CREAT | O_TRUNC, DEFFILEMODE))
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== -1)
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err(1, "open(%s)", file);
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if (unlink(file) == -1)
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err(1, "unlink(%s)", file);
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if (ftruncate(fd, len) == -1)
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err(1, "ftruncete()");
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if ((p = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) ==
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MAP_FAILED)
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err(1, "mmap()");
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for (i = 0; i < len; i += PAGE_SIZE)
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p[i] = 1;
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if (munmap(p, len) == -1)
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err(1, "munmap()");
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if ((vec = malloc(len / PAGE_SIZE)) == NULL)
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err(1, "malloc");
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if ((p = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) ==
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MAP_FAILED)
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err(1, "mmap()");
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if (mincore(p, len, vec) == -1)
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err(1, "mincore()");
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if (munmap(p, len) == -1)
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err(1, "munmap()");
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close(fd);
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_exit(0);
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}
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int
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main(int argc __unused, char *argv[])
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{
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pid_t pids[PARALLEL];
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time_t start;
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int i;
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for (i = 0; i < PARALLEL; i++) {
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if ((pids[i] = fork()) == 0)
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test(argv[1]);
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}
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start = time(NULL);
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while (time(NULL) - start < RUNTIME) {
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for (i = 0; i < PARALLEL; i++) {
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if (waitpid(pids[i], NULL, WNOHANG) == pids[i]) {
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if ((pids[i] = fork()) == 0)
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test(argv[1]);
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}
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}
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}
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for (i = 0; i < PARALLEL; i++) {
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if (waitpid(pids[i], NULL, 0) != pids[i])
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err(1, "waitpid");
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}
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return (0);
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}
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