Comment 3 for bug 1731864

As I understand the RPC function `schedule_and_build_instances` is called from https://github.com/openstack/nova/blob/master/nova/conductor/api.py#L130 . Most probably it would be enough to add profiler.trace_cls decorator to the class ComputeTaskAPI.

The main problem here is that all instrumentation points are set manually and there's no guaranty of 100% coverage. More correct approach would be to instrument RPC library itself and catch all function calls.