66 lines
2.4 KiB
Bash
Executable File
66 lines
2.4 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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# Test vm.overcommit. Variation of overcommit.sh
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# Use a swap backed MD disk with the size of 1.2 * hw.usermem.
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# Deadlock seen: https://people.freebsd.org/~pho/stress/log/alan007.txt
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[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
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[ `swapinfo | wc -l` -eq 1 ] && exit 0
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. ../default.cfg
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old=`sysctl -n vm.overcommit`
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[ $old -eq 1 ] && exit
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size=$((`sysctl -n hw.usermem` / 1024 / 1024)) # in MB
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size=$((size + size / 100 * 20)) # 120% of hw.usermem
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sysctl vm.overcommit=1
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trap "sysctl vm.overcommit=$old" EXIT INT
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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 ${size}m -u $mdstart
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bsdlabel -w md$mdstart auto
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newfs $newfs_flags md${mdstart}$part > /dev/null
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mount /dev/md${mdstart}$part $mntpoint
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echo "Expect:
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/mnt: write failed, filesystem is full
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dd: /mnt/big.1: No space left on device"
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for i in `jot 10`; do
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dd if=/dev/zero of=$mntpoint/big.$i bs=1m status=none
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done
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wait
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while mount | grep "on $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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