Technical Basics

Currently running tasks with low priority must be preempted to allow the real-time critical task to run. Preemption depends on the rules of the task’s scheduling policy. Another important aspect in a real-time system is the guaranteeing the exclusive use of certain resources for real-time tasks.

Technical details of PREEMPT_RT patch

The main aim of the PREEMPT_RT patch is to minimize the amount of kernel code that is non-preemptible ¹⁾. Therefore several substitution mechanisms and new mechanisms are implemented.

HOWTOs

There are three categories of HOWTOs:

• RTOS and RT application

• RT latency debugging

• RT tools and utilities

Publications

Several real-time related publications can help broaden your knowledge about real-time systems.

Known Limitations

Some functionality is not available on RT because its implementation is not compatible with RT. Those limitations may apply to the to the kernel as a whole or may apply to specific architecture or platforms.