#!/bin/sh
#
# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
#
# Copyright (c) 2019 Dell EMC Isilon
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# Tmpfs version of holdcnt0.sh
# Test scenario suggestion by alc@
[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
[ `swapinfo | wc -l` -eq 1 ] && exit 0
[ `sysctl -n hw.physmem` -lt $((32 * 1024 * 1024 * 1024)) ] && exit 0
. ../default.cfg
here=`pwd`
cd /tmp
sed '1,/^EOF/d' < $here/$0 > holdcnt05.c
cc -o holdcnt05 -Wall -Wextra -g holdcnt05.c || exit 1
rm -f holdcnt05.c
cd $here
mount | grep $mntpoint && umount -f $mntpoint
mount -t tmpfs null $mntpoint
cd $mntpoint
/tmp/holdcnt05
s=$?
cd /
while mount | grep -q "on $mntpoint "; do
umount $mntpoint || sleep 1
done
rm -f /tmp/holdcnt05
[ $s -ne 0 ] && echo "Exit status $s"
exit $s
EOF
/*
A test that causes the page daemon to generate cached pages
within a bunch of files and has some consumer that is trying to
allocate new pages to the same files.
*/
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#define BUFSIZE (1024 * 1024)
#define FILES 200
#define RPARALLEL 8
#define WPARALLEL 2
static jmp_buf jbuf;
static off_t maxsize;
static int ps;
static char *buf;
static volatile char val;
static void
hand(int i __unused) { /* handler */
#if defined(DEBUG)
fprintf(stderr, "%d ", i);
#endif
longjmp(jbuf, 1);
}
static void
cleanup(void)
{
int i;
char file[80];
for (i = 0; i < FILES; i++) {
snprintf(file, sizeof(file), "f%06d", i);
unlink(file);
}
}
static void
init(void)
{
int fd, i;
char file[80];
for (i = 0; i < FILES; i++) {
snprintf(file, sizeof(file), "f%06d", i);
if ((fd = open(file, O_RDWR | O_CREAT | O_TRUNC, 0644)) ==
-1)
err(1, "open(%s)", file);
if (write(fd, buf, BUFSIZE) != BUFSIZE)
err(1, "write");
close(fd);
}
}
static void
writer(void)
{
struct stat statbuf;
time_t start;
int fd, i;
char file[80];
setproctitle("writer");
start = time(NULL);
while (time(NULL) - start < 600) {
for (i = 0; i < FILES; i++) {
snprintf(file, sizeof(file), "f%06d", i);
if ((fd = open(file, O_RDWR | O_APPEND)) == -1) {
if (errno != ENOENT)
err(1, "open(%s) append", file);
goto err;
}
if (fstat(fd, &statbuf) < 0)
err(1, "fstat error");
if (statbuf.st_size < maxsize) {
if (write(fd, buf, ps) != ps) {
warn("writer");
goto err;
}
}
close(fd);
}
}
err:
cleanup();
_exit(0);
}
static void
reader(void)
{
struct stat statbuf;
void *p;
size_t len;
int fd, i, j, n;
char file[80];
setproctitle("reader");
signal(SIGSEGV, hand);
signal(SIGBUS, hand);
fd = 0;
for (;;) {
(void)setjmp(jbuf);
for (i = 0; i < FILES; i++) {
snprintf(file, sizeof(file), "f%06d", i);
if (fd > 0)
close(fd);
if ((fd = open(file, O_RDWR)) == -1) {
if (errno != ENOENT)
warn("reader(%s)", file);
_exit(0);
}
if (fstat(fd, &statbuf) < 0)
err(1, "fstat error");
if (statbuf.st_size >= maxsize) {
if (ftruncate(fd, ps) == -1)
err(1, "ftruncate");
continue;
}
len = statbuf.st_size;
if ((p = mmap(p, len, PROT_READ, MAP_SHARED, fd, 0))
== MAP_FAILED)
err(1, "mmap()");
close(fd);
n = statbuf.st_size / ps;
for (j = 0; j < n; j++) {
val = *(char *)p;
p = p + ps;
}
#if 0
if (munmap(p, len) == -1)
perror("munmap");
#endif
}
}
_exit(0);
}
int
main(void)
{
pid_t rpid[RPARALLEL], wpid[WPARALLEL];
int e, i, s;
maxsize = 2LL * 1024 * 1024 * 1024 / FILES;
buf = malloc(BUFSIZE);
ps = getpagesize();
init();
e = 0;
for (i = 0; i < WPARALLEL; i++) {
if ((wpid[i] = fork()) == 0)
writer();
}
for (i = 0; i < RPARALLEL; i++) {
if ((rpid[i] = fork()) == 0)
reader();
}
for (i = 0; i < WPARALLEL; i++) {
waitpid(wpid[i], &s, 0);
if (e == 0)
e = s;
}
for (i = 0; i < RPARALLEL; i++) {
waitpid(rpid[i], &s, 0);
if (e == 0)
e = s;
}
free(buf);
return (e);
}
