Darren Reed writes:
> 
> No, but I've been thinking about what it'd take to add that sort of
> feature to NetBSD.
> 
> I'm also interested in adding a "zero-swap on shutdown" feature that
> writes 0's over the entire swap partition when the box is shutdown
> normally (not a panic).

Presumably this feature could keep track of the high water mark for
swap usage?  So if I've only ever used 8MB of swap, on the shutdown that
is all that is zeroed out.

-Andrew