Tracking interactive episodes

• Start of an interactive episode:

  • X server sends a message to another task.

• During interactive episode:

  • Keep track of communicating tasks (episode’s task set).
  • Compute desired metrics.

• Conditions for ending the episode (applied to tasks in the episode’s task set):

  • No tasks are executing.
  • Data written by the tasks have been consumed.
  • No task was preempted the last time it ran.
  • No tasks are blocked on I/O.