https://groups.google.com/forum/?hl=en#!topic/linux.kernel/tv7X44Nlwlk%5B1-25-false%5D
http://lwn.net/Articles/460857/
http://lwn.net/Articles/392897/
http://lwn.net/Articles/390369/
http://lwn.net/Articles/416690/
http://lwn.net/Articles/336729/