Mainly cleanup. Removed some inappropriate low-memory handling code

and added lots of comments.  Add tie-in to vm_pager ( and thus the
    new swapper ) to deallocate backing swap for dirtied pages on the fly.

sys/vm/vm_fault.c

@@ -66,7 +66,7 @@
  * any improvements or extensions that they make and grant Carnegie the
  * rights to redistribute these changes.
  *
- * $Id: vm_fault.c,v 1.93 1999/01/10 01:58:28 eivind Exp $
+ * $Id: vm_fault.c,v 1.94 1999/01/21 08:29:10 dillon Exp $
  */
 
 /*