freebsd-dev/tools/test/stress2/misc/maxvnodes.sh

#!/bin/sh

#
# Copyright (c) 2015 EMC Corp.
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[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1

# Test dynamic kern.maxvnodes implementation.

# "panic: vm_fault_hold: fault on nofault entry, addr: 0xfffffe00b1b3c000"
# seen: https://people.freebsd.org/~pho/stress/log/kostik1175.txt

# https://people.freebsd.org/~pho/stress/log/log0084.txt
# Fixed by: dc532884d582

. ../default.cfg

kldstat | grep -q tmpfs && loaded=1
mount | grep $mntpoint | grep -q /dev/md && umount -f $mntpoint
mount -o size=2g -t tmpfs tmpfs $mntpoint || exit 1
chmod 777 $mntpoint

oldmx=`sysctl -n kern.maxvnodes`
trap "sysctl kern.maxvnodes=$oldmx > /dev/null" EXIT SIGINT

export runRUNTIME=10m
export RUNDIR=$mntpoint/stressX
export TESTPROGS="
testcases/creat/creat
testcases/mkdir/mkdir
testcases/swap/swap
"
export creatINCARNATIONS=50
export creatLOAD=100

su $testuser -c 'cd ..; ./testcases/run/run $TESTPROGS' > /dev/null 2>&1 &

min=1000
max=$((oldmx * 4))
while kill -0 $! 2>/dev/null; do
	sysctl kern.maxvnodes=`jot -r 1 $min $max` > /dev/null
	sleep .2
done
wait

while mount | grep $mntpoint | grep -q tmpfs; do
	umount $mntpoint || sleep 1
done
[ $loaded ] && kldunload tmpfs.ko
exit 0