Now we'll cover a couple of advanced use cases of power framework. These are particularly geared towards optimizing for performance. It may be useful to read Power framework in depth before looking at these advanced use cases.
Both of the advanced usages focus on reducing the number of power framework interactions and are good (possibly the only) options for high event rate systems. Most of the time when the system is awake it is because there is a high-level policy keeping it that way, for example, only sleep if we've gone 5 minutes without a keyboard or mouse event. This means that most of the time the system will stay awake long enough for us to get our work done and it is only when the system is waking from sleep or trying to suspend that we need to interact with power framework. In other words, it is only at system state transition edges into and out of suspension where power framework interaction is required. At these edges our code must do additional work.