1#!/bin/sh 2 3# 4# Copyright (c) 2014 EMC Corp. 5# All rights reserved. 6# 7# Redistribution and use in source and binary forms, with or without 8# modification, are permitted provided that the following conditions 9# are met: 10# 1. Redistributions of source code must retain the above copyright 11# notice, this list of conditions and the following disclaimer. 12# 2. Redistributions in binary form must reproduce the above copyright 13# notice, this list of conditions and the following disclaimer in the 14# documentation and/or other materials provided with the distribution. 15# 16# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26# SUCH DAMAGE. 27# 28 29# Test vm.overcommit. Variation of overcommit.sh 30# Use a swap backed MD disk with the size of 1.2 * hw.usermem. 31# Deadlock seen: https://people.freebsd.org/~pho/stress/log/alan007.txt 32 33[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 34[ `swapinfo | wc -l` -eq 1 ] && exit 0 35 36. ../default.cfg 37 38old=`sysctl -n vm.overcommit` 39[ $old -eq 1 ] && exit 40 41size=$((`sysctl -n hw.usermem` / 1024 / 1024)) # in MB 42size=$((size + size / 100 * 20)) # 120% of hw.usermem 43sysctl vm.overcommit=1 44trap "sysctl vm.overcommit=$old" EXIT INT 45 46mount | grep $mntpoint | grep -q /dev/md && umount -f $mntpoint 47mdconfig -l | grep -q md$mdstart && mdconfig -d -u $mdstart 48mdconfig -a -t swap -s ${size}m -u $mdstart 49newfs $newfs_flags md$mdstart > /dev/null 50mount /dev/md$mdstart $mntpoint 51 52echo "Expect: 53 /mnt: write failed, filesystem is full 54 dd: /mnt/big.1: No space left on device" 55 56for i in `jot 10`; do 57 dd if=/dev/zero of=$mntpoint/big.$i bs=1m status=none 58done 59wait 60 61while mount | grep "on $mntpoint " | grep -q /dev/md; do 62 umount $mntpoint || sleep 1 63done 64mdconfig -d -u $mdstart 65