code: func rankMemoryPressure(pods []*v1.Pod, stats statsFunc) {
  	orderedBy(exceedMemoryRequests(stats), priority, memory(stats)).Sort(pods)
  }
docs: // rankMemoryPressure orders the input pods for eviction in response to memory pressure.
  // It ranks by whether or not the pod's usage exceeds its requests, then by priority, and
  // finally by memory usage above requests.