1 files changed, 15 insertions, 0 deletions
diff --git a/vm/vm_user.c b/vm/vm_user.c
index c5530a69..1385b127 100644
--- a/vm/vm_user.c
+++ b/vm/vm_user.c
@@ -239,6 +239,21 @@ kern_return_t vm_machine_attribute(map, address, size, attribute, value)
 	return vm_map_machine_attribute(map, address, size, attribute, value);
 }
 
+/*
+ * Return machine-specific attribute for memory advice, such
+ * as maximal size of requested cluster.
+ */
+kern_return_t
+vm_get_advice_info(vm_map_t map, vm_size_t* max_cluster /* OUT */)
+{
+	if (map == VM_MAP_NULL)
+		return(KERN_INVALID_ARGUMENT);
+
+        *max_cluster = VM_ADVICE_MAX_READAHEAD * PAGE_SIZE;
+
+	return KERN_SUCCESS;
+}
+
 kern_return_t vm_read(map, address, size, data, data_size)
 	vm_map_t	map;
 	vm_address_t	address;