diff --git a/sys/vm/vm_radix.h b/sys/vm/vm_radix.h
--- a/sys/vm/vm_radix.h
+++ b/sys/vm/vm_radix.h
@@ -60,7 +60,7 @@
     vm_radix_node_free, vm_radix_smr);
 
 /*
- * Inserts the key-value pair into the trie.
+ * Inserts the key-value pair into the trie, starting search from root.
  * Panics if the key already exists.
  */
 static __inline int
@@ -69,6 +69,16 @@
 	return (VM_RADIX_PCTRIE_INSERT(&rtree->rt_trie, page));
 }
 
+/*
+ * Inserts the key-value pair into the trie, starting search from iterator.
+ * Panics if the key already exists.
+ */
+static __inline int
+vm_radix_iter_insert(struct pctrie_iter *pages, vm_page_t page)
+{
+	return (VM_RADIX_PCTRIE_ITER_INSERT(pages, page));
+}
+
 /*
  * Insert the page into the vm_radix tree with its pindex as the key.  Panic if
  * the pindex already exists.  Return zero on success or a non-zero error on
@@ -187,6 +197,15 @@
 {
 	return (VM_RADIX_PCTRIE_REMOVE_LOOKUP(&rtree->rt_trie, index));
 }
+
+/*
+ * Remove the current page from the trie.
+ */
+static __inline void
+vm_radix_iter_remove(struct pctrie_iter *pages)
+{
+	VM_RADIX_PCTRIE_ITER_REMOVE(pages);
+}
  
 /*
  * Reclaim all the interior nodes of the trie, and invoke the callback