Here is a patch for a different JAIL sub-system for FreeBSD
From the documentation:
Low overhead Since VPS is based on the operating system level, the cpu,
memory and diskspace overhead for virtualizing is very small.
Similarity of virtual to non-virtual environments VPS aims to create
virtual environments as similar to non-virtual environments as possible. When
migrating a non-virtual installation into a VPS instance, only con.guration .les
referring to hardware need modi.cation (e.g. /etc/fstab).
Nested virtualization VPS works in a hierarchical way, allowing VPS in-
stances to create and manage their own VPS child instances. If a resource quota
is set for a VPS instance, it has to share its own quota with VPS child instances
it creates.
Live migration VPS instances can be migrated from one physical host to
another, preserving the running state. This includes all network con.guration,
running processes and established TCP connections.
Fine grained resource control VPS will support .ne grained resource ac-
counting and limiting in the future.
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