Per-user/group memory limits

[Swift Griggs <swiftgriggs%gmail.com@localhost>]

I noticed this page:
https://wiki.netbsd.org/projects/project/tmpfs-quotas/

Does that only apply to tmpfs (ie.. RAM disks) or would it be usable to 
limit total process memory usage by a given user? I'm just curious as to 
what portion of linux's "Control Groups" / "CGroups" is already present in 
the BSDs, and of course most notably within NetBSD.

Thanks,
  Swift