// Stop here if we're cooling down from the controller.
	if s.controllerCooldown > 0 {
		// worked and slept aren't exact measures of time, but it's OK to be a bit
		// sloppy here. We're just hoping we're avoiding some transient bad behavior.
		t := slept + int64(worked)
		if t > s.controllerCooldown {
			s.controllerCooldown = 0
		} else {
			s.controllerCooldown -= t
		}
		return
	}