diff --git a/sys/vm/vm_fault.c b/sys/vm/vm_fault.c
index 1558f629e756..757f573e715a 100644
--- a/sys/vm/vm_fault.c
+++ b/sys/vm/vm_fault.c
@@ -663,9 +663,7 @@ RetryFault:;
 				/*
 				 * grab the lock if we need to
 				 */
-				(fs.lookup_still_valid ||
-				 lockmgr(&fs.map->lock, LK_EXCLUSIVE|LK_NOWAIT, (void *)0, curthread) == 0)
-			    ) {
+			    (fs.lookup_still_valid || vm_map_trylock(fs.map))) {
 				
 				fs.lookup_still_valid = 1;
 				/*
diff --git a/sys/vm/vm_glue.c b/sys/vm/vm_glue.c
index 2adbb4ad8325..66eaa6bbf79f 100644
--- a/sys/vm/vm_glue.c
+++ b/sys/vm/vm_glue.c
@@ -560,9 +560,7 @@ int action;
 			 * data structures there is a
 			 * possible deadlock.
 			 */
-			if (lockmgr(&vm->vm_map.lock,
-					LK_EXCLUSIVE | LK_NOWAIT,
-					NULL, curthread)) {
+			if (!vm_map_trylock(&vm->vm_map)) {
 				vmspace_free(vm);
 				PROC_UNLOCK(p);
 				goto nextproc;
diff --git a/sys/vm/vm_map.c b/sys/vm/vm_map.c
index 73cf6b0557a2..9b91c1a01e3d 100644
--- a/sys/vm/vm_map.c
+++ b/sys/vm/vm_map.c
@@ -336,6 +336,7 @@ vmspace_swap_count(struct vmspace *vmspace)
 	vm_map_entry_t cur;
 	int count = 0;
 
+	vm_map_lock_read(map);
 	for (cur = map->header.next; cur != &map->header; cur = cur->next) {
 		vm_object_t object;
 
@@ -351,6 +352,7 @@ vmspace_swap_count(struct vmspace *vmspace)
 			}
 		}
 	}
+	vm_map_unlock_read(map);
 	return (count);
 }
 
@@ -397,6 +399,14 @@ vm_map_unlock_read(vm_map_t map)
 	lockmgr(&(map)->lock, LK_RELEASE, NULL, curthread);
 }
 
+int
+vm_map_trylock(vm_map_t map)
+{
+
+	return (lockmgr(&map->lock, LK_EXCLUSIVE | LK_NOWAIT, NULL,
+		    curthread) == 0);
+}
+
 static __inline__ int
 _vm_map_lock_upgrade(vm_map_t map, struct thread *td) {
 	int error;
diff --git a/sys/vm/vm_map.h b/sys/vm/vm_map.h
index fbc44c940a27..8de264f11db6 100644
--- a/sys/vm/vm_map.h
+++ b/sys/vm/vm_map.h
@@ -241,6 +241,7 @@ void vm_map_lock(vm_map_t map);
 void vm_map_unlock(vm_map_t map);
 void vm_map_lock_read(vm_map_t map);
 void vm_map_unlock_read(vm_map_t map);
+int vm_map_trylock(vm_map_t map);
 int vm_map_lock_upgrade(vm_map_t map);
 void vm_map_lock_downgrade(vm_map_t map);
 void vm_map_set_recursive(vm_map_t map);
diff --git a/sys/vm/vm_pageout.c b/sys/vm/vm_pageout.c
index 23e94f2e7917..5708d8de89a9 100644
--- a/sys/vm/vm_pageout.c
+++ b/sys/vm/vm_pageout.c
@@ -547,9 +547,8 @@ vm_pageout_map_deactivate_pages(map, desired)
 	int nothingwired;
 
 	GIANT_REQUIRED;
-	if (lockmgr(&map->lock, LK_EXCLUSIVE | LK_NOWAIT, (void *)0, curthread)) {
+	if (!vm_map_trylock(map))
 		return;
-	}
 
 	bigobj = NULL;
 	nothingwired = TRUE;