Hi Vivek,
I happened to encount a bug when i test IO Controller V9.
When there are three tasks to run concurrently in three group,
that is, one is parent group, and other two tasks are running
in two different child groups respectively to read or write
files in some disk, say disk "hdb", The task may hang up, and
other tasks which access into "hdb" will also hang up.
The bug only happens when using AS io scheduler.
The following scirpt can reproduce this bug in my box.
===========
#!/bin/sh
mkdir /cgroup
mount -t cgroup -o io,blkio io /cgroup
echo anticipatory > /sys/block/hdb/queue/scheduler
mkdir /cgroup/test1
echo 100 > /cgroup/test1/io.weight
mkdir /cgroup/test2
echo 400 > /cgroup/test2/io.weight
mkdir /cgroup/test2/test3
echo 400 > /cgroup/test2/test3/io.weight
mkdir /cgroup/test2/test4
echo 400 > /cgroup/test2/test4/io.weight
#./rwio -r -f /hdb2/2000M.3 &
dd if=/hdb2/2000M.3 of=/dev/null &
pid4=$!
echo $pid4 > /cgroup/test2/test3/tasks
echo "pid4: $pid4"
#./rwio -r -f /hdb2/2000M.1 &
dd if=/hdb2/2000M.1 of=/dev/null &
pid1=$!
echo $pid1 > /cgroup/test1/tasks
echo "pid1 $pid1"
#./rwio -r -f /hdb2/2000M.2 &
dd if=/hdb2/2000M.2 of=/dev/null &
pid2=$!
echo $pid2 > /cgroup/test2/test4/tasks
echo "pid2 $pid2"
sleep 20
for ((;1;))
{
ps -p $pid1 > /dev/null 2>&1
if [ $? -ne 0 ]; then
break
fi
kill -9 $pid1 > /dev/null 2>&1
}
for ((;1;))
{
ps -p $pid2 > /dev/null 2>&1
if [ $? -ne 0 ]; then
break
fi
kill -9 $pid2 > /dev/null 2>&1
}
kill -9 $pid4 > /dev/null 2>&1
rmdir /cgroup/test2/test3
rmdir /cgroup/test2/test4
rmdir /cgroup/test2
rmdir /cgroup/test1
umount /cgroup
rmdir /cgroup
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