Open Stack

Hi
I think of  starting to use OpenStack.
Because I want to monitor resource usage (CPU utilization, memory, 
...etc) with OpenStack!!
I have one question.
Can I restrict resource with OpenStack?

For example, is it possible to limit the CPU to 20 % for process that 
normally use 50% CPU?
If you have such a command, please let me know!

Thanks.

--
Name: Kurokawa Ryota
mail: rk_1218_live at i.softbank.jp