svn commit: r247682 - user/attilio/vmc-playground/sys/vm

[Alan Cox]

Author: alc
Date: Sun Mar  3 01:36:31 2013
New Revision: 247682
URL: http://svnweb.freebsd.org/changeset/base/247682

Log:
  Two out of three times that vm_page_find_least() is called, it's going to
  return the vm object's first page.  In those cases, there is no need to
  traverse the trie.
  
  Sponsored by:	EMC / Isilon Storage Division

Modified:
  user/attilio/vmc-playground/sys/vm/vm_page.c

Modified: user/attilio/vmc-playground/sys/vm/vm_page.c
==============================================================================
--- user/attilio/vmc-playground/sys/vm/vm_page.c	Sun Mar  3 01:26:11 2013	(r247681)
+++ user/attilio/vmc-playground/sys/vm/vm_page.c	Sun Mar  3 01:36:31 2013	(r247682)
@@ -929,9 +929,12 @@ vm_page_lookup(vm_object_t object, vm_pi
 vm_page_t
 vm_page_find_least(vm_object_t object, vm_pindex_t pindex)
 {
+	vm_page_t m;
 
 	VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
-	return (vm_radix_lookup_ge(&object->rtree, pindex));
+	if ((m = TAILQ_FIRST(&object->memq)) != NULL && m->pindex < pindex)
+		m = vm_radix_lookup_ge(&object->rtree, pindex);
+	return (m);
 }
 
 /*