Reimplement the reclamation of PV entries. Specifically, perform

reclamation synchronously from get_pv_entry() instead of
asynchronously as part of the page daemon.  Additionally, limit the
reclamation to inactive pages unless allocation from the PV entry zone
or reclamation from the inactive queue fails.  Previously, reclamation
destroyed mappings to both inactive and active pages.  get_pv_entry()
still, however, wakes up the page daemon when reclamation occurs.  The
reason being that the page daemon may move some pages from the active
queue to the inactive queue, making some new pages available to future
reclamations.

Print the "reclaiming PV entries" message at most once per minute, but
don't stop printing it after the fifth time.  This way, we do not give
the impression that the problem has gone away.

Reviewed by: tegge

1 files changed, 0 insertions, 2 deletions

diff --git a/sys/vm/pmap.h b/sys/vm/pmap.h
index d5b64c3fc772..2379171e47d2 100644
--- a/sys/vm/pmap.h
+++ b/sys/vm/pmap.h
@@ -90,8 +90,6 @@ struct thread;
  */
 extern vm_offset_t kernel_vm_end;
 
-extern	int	 pmap_pagedaemon_waken;
-
 void		 pmap_change_wiring(pmap_t, vm_offset_t, boolean_t);
 void		 pmap_clear_modify(vm_page_t m);
 void		 pmap_clear_reference(vm_page_t m);