125 lines
3.1 KiB
Bash
Executable File
125 lines
3.1 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (c) 2014 EMC Corp.
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# All rights reserved.
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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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[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
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# Demonstrate starvation: Thread stuck in "ufs" for minutes.
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# Only seen with >= 16 CPUs.
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# Not a problem with 4BSD.
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# http://people.freebsd.org/~pho/stress/log/spin.txt
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# Fixed by r273966.
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. ../default.cfg
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timeout=1200
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here=`pwd`
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cd /tmp
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sed '1,/^EOF/d' < $here/$0 > spin.c
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mycc -o spin -Wall -Wextra -O0 spin.c || exit 1
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rm -f spin.c
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cd $here
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mount | grep $mntpoint | grep -q /dev/md && umount -f $mntpoint
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mdconfig -l | grep -q md$mdstart && mdconfig -d -u $mdstart
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mdconfig -a -t swap -s 1g -u $mdstart || exit 1
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bsdlabel -w md$mdstart auto
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newfs $newfs_flags -n md${mdstart}$part > /dev/null
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mount /dev/md${mdstart}$part $mntpoint
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cpus=`sysctl hw.ncpu | sed 's/.*: //'`
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(cd $mntpoint; /tmp/spin $((cpus + 1))) &
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error=0
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n=0
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while kill -0 $! 2>/dev/null; do
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sleep 1
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if [ $((n += 1)) -gt $timeout ]; then
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echo FAIL
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ps -l | grep -v sed | sed -n '1p;/ufs/p'
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pkill spin
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error=1
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fi
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done
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wait
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while mount | grep $mntpoint | grep -q /dev/md; do
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umount $mntpoint || sleep 1
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done
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mdconfig -d -u $mdstart
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rm -f /tmp/spin
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exit $error
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EOF
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#include <sys/param.h>
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#include <sys/wait.h>
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#include <err.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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void
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work(void)
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{
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while (access("rendezvous", R_OK) != 0)
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;
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_exit(0);
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}
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int
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main(int argc, char **argv)
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{
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int fd, i, parallel;
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if (argc == 2)
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parallel = atoi(argv[1]);
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else
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errx(1, "Usage: %s <cpus>", argv[0]);
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for (i = 0; i < parallel; i++) {
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if (fork() == 0)
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work();
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}
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/* open(2) blocked on "ufs" for minutes */
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if ((fd = open("rendezvous", O_CREAT, 0644)) == -1)
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err(1, "open()");
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close(fd);
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for (i = 0; i < parallel; i++)
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wait(NULL);
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if (unlink("rendezvous") == -1)
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err(1, "unlink()");
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return (0);
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}
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