ACPICA: Optimization: Reduce the number of namespace walks

On control method exit, only walk the namespace if the method is
known to have created namespace objects outside of its local scope.
Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/acpi/acpica/dsmethod.c

@@ -584,10 +584,24 @@ acpi_ds_terminate_control_method(union acpi_operand_object *method_desc,
 		 * want make the objects permanent.
 		 */
 		if (!(method_desc->method.flags & AOPOBJ_MODULE_LEVEL)) {
-			acpi_ns_delete_namespace_by_owner(method_desc->method.
+
+			/* Delete any direct children of (created by) this method */
+
+			acpi_ns_delete_namespace_subtree(walk_state->
+							 method_node);
+
+			/*
+			 * Delete any objects that were created by this method
+			 * elsewhere in the namespace (if any were created).
+			 */
+			if (method_desc->method.
+			    flags & AOPOBJ_MODIFIED_NAMESPACE) {
+				acpi_ns_delete_namespace_by_owner(method_desc->
+								  method.
 								  owner_id);
 			}
 		}
+	}
 
 	/* Decrement the thread count on the method */
 

drivers/acpi/acpica/nsalloc.c

@@ -219,12 +219,24 @@ void acpi_ns_install_node(struct acpi_walk_state *walk_state, struct acpi_namesp
 
 	ACPI_FUNCTION_TRACE(ns_install_node);
 
+	if (walk_state) {
 		/*
-	 * Get the owner ID from the Walk state. The owner ID is used to track
-	 * table deletion and deletion of objects created by methods.
+		 * Get the owner ID from the Walk state. The owner ID is used to
+		 * track table deletion and deletion of objects created by methods.
 		 */
-	if (walk_state) {
 		owner_id = walk_state->owner_id;
+
+		if ((walk_state->method_desc) &&
+		    (parent_node != walk_state->method_node)) {
+			/*
+			 * A method is creating a new node that is not a child of the
+			 * method (it is non-local). Mark the executing method as having
+			 * modified the namespace. This is used for cleanup when the
+			 * method exits.
+			 */
+			walk_state->method_desc->method.flags |=
+			    AOPOBJ_MODIFIED_NAMESPACE;
+		}
 	}
 
 	/* Link the new entry into the parent and existing children */