On Thu, Oct 18, 2001 at 07:14:31PM +0100, Richard Earnshaw wrote:

 > But that doesn't solve the critical problem that for a given pmap we can't 
 > tell if the pmap is physically shared with another process (to know this, 
 > you need to know the proc it is part of); if it is, and we remove the 
 > page0 entry, then we loose the whole system.

Well, there is a reference count mechanism in the pmap subsystem...
pmap_reference() and pmap_destroy() frob it.

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