This was linked elsewhere in the comments. I think it answers some of your questions: http://lwn.net/SubscriberLink/644675/5be656c24083e53b/ http://lwn.net/Sub

This was linked elsewhere in the comments. I think it answers some of your questions: http://lwn.net/SubscriberLink/644675/5be656c24083e53b/ http://lwn.net/SubscriberLink/644675/5be656c24083e53b/