57 lines
2.3 KiB
Bash
Executable File
57 lines
2.3 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (c) 2015 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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# Out of swap seen with no swap disk:
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# dd 'if=/dev/zero' 'of=/var/tmp/diskimage.1' 'bs=1m' 'count=3427'
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# pid 598 (ntpd), uid 0, was killed: out of swap space
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# pid 656 (sendmail), uid 0, was killed: out of swap space
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# pid 659 (sendmail), uid 25, was killed: out of swap space
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# https://people.freebsd.org/~pho/stress/log/alan020.txt
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# Deadlock seen:
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# https://people.freebsd.org/~pho/stress/log/kostik845.txt
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# Fixed by r290920.
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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 hw.physmem` -gt $(( 8 * 1024 * 1024 * 1024)) ] && exit 0
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[ `swapinfo | wc -l` -eq 1 ] || { swapoff -a; off=1; }
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size=$((`sysctl -n hw.physmem` / 1024 / 1024))
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need=$((size * 2))
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d1=$diskimage.1
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d2=$diskimage.2
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rm -f $d1 $d2 || exit 1
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[ `df -k $(dirname $diskimage) | tail -1 | awk '{print int($4 / 1024)}'` \
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-lt $need ] &&
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printf "Need %d MB on %s.\n" $need `dirname $diskimage` && exit 0
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trap "rm -f $d1 $d2" EXIT INT
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dd if=/dev/zero of=$d1 bs=1m count=$size status=none
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cp $d1 $d2
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[ $off ] && swapon -a
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