mkfs -t ext4 -q /dev/sda1
echo 1 > /sys/kernel/debug/tracing/events/writeback/balance_dirty_pages/enable
echo 1 > /sys/kernel/debug/tracing/events/writeback/bdi_dirty_ratelimit/enable
echo 1 > /sys/kernel/debug/tracing/events/writeback/global_dirty_state/enable
echo 1 > /sys/kernel/debug/tracing/events/writeback/writeback_single_inode/enable
mount -t ext4 /dev/sda1 /fs/sda1
dd  if=/dev/zero of=/fs/sda1/zero-1 status=none &
sleep 600
killall -9 dd