On Mon, 09 Nov 1998 22:22:31 -0800 
 Jonathan Stone <jonathan@DSG.Stanford.EDU> wrote:

 > Someone -- gwr(?) suggested something very similar for mips: having a
 > designated "empty" userspace pmap, and sharing that single pmap across
 > all kernel-mode-only processes. (we dont do it fully yet because it'
 > break our current kstack over/underflow red-zoning.)

Pardon me?  swapper, pagedaemon, and reaper (kernel-only processes) all
share vmspace0/kernel_pmap.

Jason R. Thorpe                                       thorpej@nas.nasa.gov
NASA Ames Research Center                            Home: +1 408 866 1912
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