On Tue, Jan 09, 2001 at 07:01:06PM -0500, Chuck Cranor wrote:

 > i had thought that the PV allocator used PTs as a backup memory
 > allocation mechanism, but either that code got removed or i forgot
 > to put it in?

You must have forgotten to put that in.

 > my thinking at the time was that you had to have some valid mappings
 > in order to make forward progress... so there should be a victim out
 > there.   one thing that could make it a bit iffy is handling of resources
 > associated with wired mappings.

It gets complicated with wired mappings and also as processes get swapped
out or exit -- their PT pages go away, and so you can't steal them.

-- 
        -- Jason R. Thorpe <thorpej@zembu.com>