> There are a couple of configurations of systems for NetBSD where swapping
> is unnecessary, or even undesireable. The Sun 3/50 "Xterminal" and some
> diskless NC configurations come to mind.
> 
> How well does UVM deal with not having any swap space?
> 
> How hard would it be to properly support such configurations (i.e. no
> hangs, crashes, etc, if RAM exhaustion hits)?

At best, this would be equivalent to swap space exhaustion when you have
some configured.

Don't know about UVM, but in MACH VM this is catastrophic.

Problem is, you have to choose between different types of DoS attacks... either
"panic the machine" or "shut root out"; so there is no real solution.

	-is