18a272653SPeter Holm#!/bin/sh 28a272653SPeter Holm 38a272653SPeter Holm# 48a272653SPeter Holm# Copyright (c) 2014 EMC Corp. 58a272653SPeter Holm# All rights reserved. 68a272653SPeter Holm# 78a272653SPeter Holm# Redistribution and use in source and binary forms, with or without 88a272653SPeter Holm# modification, are permitted provided that the following conditions 98a272653SPeter Holm# are met: 108a272653SPeter Holm# 1. Redistributions of source code must retain the above copyright 118a272653SPeter Holm# notice, this list of conditions and the following disclaimer. 128a272653SPeter Holm# 2. Redistributions in binary form must reproduce the above copyright 138a272653SPeter Holm# notice, this list of conditions and the following disclaimer in the 148a272653SPeter Holm# documentation and/or other materials provided with the distribution. 158a272653SPeter Holm# 168a272653SPeter Holm# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 178a272653SPeter Holm# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 188a272653SPeter Holm# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 198a272653SPeter Holm# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 208a272653SPeter Holm# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 218a272653SPeter Holm# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 228a272653SPeter Holm# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 238a272653SPeter Holm# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 248a272653SPeter Holm# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 258a272653SPeter Holm# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 268a272653SPeter Holm# SUCH DAMAGE. 278a272653SPeter Holm# 288a272653SPeter Holm 298a272653SPeter Holm# Test vm.overcommit. Variation of overcommit.sh 308a272653SPeter Holm# Use a swap backed MD disk with the size of 1.2 * hw.usermem. 318a272653SPeter Holm# Deadlock seen: https://people.freebsd.org/~pho/stress/log/alan007.txt 328a272653SPeter Holm 338a272653SPeter Holm[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 348a272653SPeter Holm[ `swapinfo | wc -l` -eq 1 ] && exit 0 358a272653SPeter Holm 368a272653SPeter Holm. ../default.cfg 378a272653SPeter Holm 388a272653SPeter Holmold=`sysctl -n vm.overcommit` 398a272653SPeter Holm[ $old -eq 1 ] && exit 408a272653SPeter Holm 418a272653SPeter Holmsize=$((`sysctl -n hw.usermem` / 1024 / 1024)) # in MB 428a272653SPeter Holmsize=$((size + size / 100 * 20)) # 120% of hw.usermem 438a272653SPeter Holmsysctl vm.overcommit=1 448a272653SPeter Holmtrap "sysctl vm.overcommit=$old" EXIT INT 458a272653SPeter Holm 468a272653SPeter Holmmount | grep $mntpoint | grep -q /dev/md && umount -f $mntpoint 478a272653SPeter Holmmdconfig -l | grep -q md$mdstart && mdconfig -d -u $mdstart 488a272653SPeter Holmmdconfig -a -t swap -s ${size}m -u $mdstart 49*608c97bfSPeter Holmnewfs $newfs_flags md$mdstart > /dev/null 50*608c97bfSPeter Holmmount /dev/md$mdstart $mntpoint 518a272653SPeter Holm 528a272653SPeter Holmecho "Expect: 538a272653SPeter Holm /mnt: write failed, filesystem is full 548a272653SPeter Holm dd: /mnt/big.1: No space left on device" 558a272653SPeter Holm 568a272653SPeter Holmfor i in `jot 10`; do 578a272653SPeter Holm dd if=/dev/zero of=$mntpoint/big.$i bs=1m status=none 588a272653SPeter Holmdone 598a272653SPeter Holmwait 608a272653SPeter Holm 618a272653SPeter Holmwhile mount | grep "on $mntpoint " | grep -q /dev/md; do 628a272653SPeter Holm umount $mntpoint || sleep 1 638a272653SPeter Holmdone 648a272653SPeter Holmmdconfig -d -u $mdstart 65