cgroups@sysinit@openrc... Any implications?

[CaptainBlood]

HI,
New stable openrc-0.38 added cgroups service at sysinit.
Currentlynone of the cgroups options in /etc/rc.conf seems activated here.

I'd like to know:

1) What's the benefit of such a service?
2) Does it have any kernel requirements?
3) If anything should be checked elsewhere in system for proper use?

Thks 4 ur attention.