1999-06-27 Thomas Bushnell, BSG <tb@mit.edu>

	* vm/vm_resident.c (vm_page_external_count): Define variable.
	(vm_page_grab): New argument `external'.  All callers changed.
	Keep track of number of externally managed pages.  Don't let
	non-privileged threads exceed the externally-managed page limit.
	(vm_page_grab_contiguous_pages): New argument `external'.  All
	callers changed.  Keep track of number of externally managed
	pages.  Don't let non-privileged threads exceed the
	externally-managed page limit.
	(vm_page_convert): New argument `external'.  All callers changed.
	(vm_page_release): New argument `external'.  All callers
	changed. Keep track of number of externally managed pages.
	(vm_page_bootstrap): Initialize M->external.
	* vm/vm_page.h (vm_page_external_limit, vm_page_external_count):
	New variables.
	(struct vm_page): New members `external' and `extcounted'.
	* vm/vm_pageout.c (vm_pageout): Initialize vm_page_external_limit
	and vm_page_external_target.
	(VM_PAGE_EXTERNAL_LIMIT, VM_PAGE_EXTERNAL_TARGET): New macro.
	(vm_pageout_external_target): New variable.
	(vm_pageout_scan): Regard "too many externally managed pages" as a
	reason to keep doing work, but if that's the only reason we're
	doing work, then the only thing we do is schedule cleaning of
	pages.  Help keep track of the number of externally managed pages
	that we care about.

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