Proposals to jail subsystem

Hi all,

The virtualization is trend now, we have zone on solaris, xen, kvm on  
linux,
especially xen takes a important role in Amazon's Cloud computing,
so I think the following functionalities would be quite useful for jail  
users:

  - Per-jail memory quota;
  - Per-jail CPU usage quota (like, we only schedule processes in this jail  
to N CPUs);
  - Allow the use of multiple IPs inside a jail;

Is it possible to implement these functionalities?

-- 
The Power to Serve