run

#!/bin/bash

BASE_DIR=$(dirname $0)
cd $BASE_DIR

fstype=$(grep "/fs " /proc/mounts | cut -f3 -d' ')
[[ $fstype ]] || { echo "no filesystem mounted on /fs"; exit 1; }

[ -f /cgroup/blkio.weight ] || mount -t cgroup -o blkio none /cgroup

echo $((500<<20)) > /proc/sys/vm/dirty_bytes

echo 1 > /debug/tracing/events/writeback/balance_dirty_pages/enable
echo 1 > /debug/tracing/events/writeback/bdi_dirty_ratelimit/enable
echo 1 > /debug/tracing/events/writeback/blkcg_dirty_ratelimit/enable
echo 1 > /debug/tracing/events/writeback/task_io/enable

# echo 1 > /sys/block/sda/trace/enable

start_tracing() {
	echo > /debug/tracing/trace

	# the fifo trick serves to avoid killing bzip2 directly
	test -p /tmp/trace_fifo || mkfifo /tmp/trace_fifo
        bzip2 < /tmp/trace_fifo > trace.bz2 &
        cat /debug/tracing/trace_pipe > /tmp/trace_fifo &
	disown %% # avoid the "Terminated" message on kill
        echo $! > pid-trace
}

run_cgroup_dd() {
	nr_cg=$1
	nr_dd=$2
	shift 2 # the remaining $* will be fed to dd

	for i in $(seq $nr_cg)
	do
		mkdir /cgroup/g$i
		echo $$ > /cgroup/g$i/tasks

		for j in $(seq $nr_dd)
		do
			dd if=/dev/zero of=/fs/zero-cg$i-dd$j $* &
		done
	done
}

export -f run_cgroup_dd

for testcase
do
	[[ $HOST ]] || HOST=$(</etc/hostname)
	dir=log/$HOST/$fstype/$testcase.`date +%F-%H-%M`
	echo $dir
	mkdir -p $dir
	cd $dir

	start_tracing

	$BASE_DIR/$testcase

	echo $$ > /cgroup/tasks
	cat /cgroup/*/tasks > pid

	sleep 100
	grep . /cgroup/*/* 2>/dev/null > cgroups
	kill $(cat pid pid-*)
	rm pid-*
	ls -l /fs > ls-files
	uname -a > uname

	wait
	$BASE_DIR/plot-task-bw.sh .
	$BASE_DIR/plot-balance_dirty_pages.sh .
	$BASE_DIR/plot-blkcg-weight-ratelimit.sh .

	chown -R wfg .
	cd $BASE_DIR
	rmdir /cgroup/*/
	rm /fs/zero*

done