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|
devs="$dev0 $dev1 $dev2 $dev3 $dev4 $dev5"
runtime=120
pid=""
old=`cat /proc/sys/vm/dirty_background_ratio`
test_write_action()
{
while true; do
echo check > /sys/block/md0/md/sync_action &> /dev/null
sleep 0.1
echo idle > /sys/block/md0/md/sync_action &> /dev/null
done
}
test_write_back()
{
fio -filename=$md0 -bs=4k -rw=write -numjobs=1 -name=test \
-time_based -runtime=$runtime &> /dev/null
}
set_up_test()
{
fio -h &> /dev/null || die "fio not found"
# create a simple raid6
mdadm -Cv -R -n 6 -l6 $md0 $devs --assume-clean || die "create raid6 failed"
# trigger dirty pages write back
echo 0 > /proc/sys/vm/dirty_background_ratio
}
clean_up_test()
{
echo $old > /proc/sys/vm/dirty_background_ratio
pkill -9 fio
kill -9 $pid
sleep 1
if ps $pid | tail -1 | awk '{print $3}' | grep D; then
die "thread that is writing sysfs is stuck in D state, deadlock is triggered"
fi
mdadm -S $md0
}
trap 'clean_up_test' EXIT
set_up_test || die "set up test failed"
test_write_back &
test_write_action &
pid="$!"
sleep $runtime
exit 0
|
