We've been using rfoo to do this. It doesn't seem to impact performance when you're not using it. When you are using it, it's unsafe if you do unsafe things.

We've been using rfoo to do this. It doesn't seem to impact performance when you're not using it. When you are using it, it's unsafe if you do unsafe things. We primarily use it for debugging by passively inspecting the messed-up portion of the server's state.