BSD "jail" functionality (again?)

I asked this before, maybe a year ago.

Does anyone know if Linux will ever have BSD "jail" functionality? I don't mean
UML or KVM, I mean "jail" where the kernel is split up into compartments.

The closest I've seen is vserver, unfortunately the project seems to be dead
(and it's a problem I have a machine relying on it..) after that, I decided
that anything involving a kernel patch is out.

Do you think linux will ever get real, actual 'jail' compartments?

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