Re: [RFC] IO Controller

[Gui Jianfeng <guijianfeng@cn.fujitsu.com>]

Vivek Goyal wrote:
> On Fri, Apr 10, 2009 at 05:33:10PM +0800, Gui Jianfeng wrote:
>> Vivek Goyal wrote:
>>> Hi All,
>>>
>>> Here is another posting for IO controller patches. Last time I had posted
>>> RFC patches for an IO controller which did bio control per cgroup.
>>   Hi Vivek,
>>
>>   I got the following OOPS when testing, can't reproduce again :(
>>
> 
> Hi Gui,
> 
> Thanks for the report. Will look into it and see if I can reproduce it.

  Hi Vivek,

  The following script can reproduce the bug in my box.

#!/bin/sh

mkdir /cgroup
mount -t cgroup -o io io /cgroup
mkdir /cgroup/test1
mkdir /cgroup/test2

echo cfq > /sys/block/sda/queue/scheduler
echo 7 > /cgroup/test1/io.ioprio
echo 1 > /cgroup/test2/io.ioprio
echo 1 > /proc/sys/vm/drop_caches
dd if=1000M.1 of=/dev/null &
pid1=$!
echo $pid1
echo $pid1 > /cgroup/test1/tasks
dd if=1000M.2 of=/dev/null
pid2=$!
echo $pid2
echo $pid2 > /cgroup/test2/tasks


rmdir /cgroup/test1
rmdir /cgroup/test2
umount /cgroup
rmdir /cgroup

-- 
Regards
Gui Jianfeng