Preempt-RT

Linux Preempt_RT

Introduction

Preempt_RT is a patch for the Linux kernel maintained by Ingo Molnar. It modifies the kernel so that it becomes (almost) completely preemptive. The classic kernel spinlocks are replaced by mutexes which support priority inheritance. In addition, the handling of all interrupts is outsourced to separate kernel threads. The presentation Linux und Echtzeit (German) by Jan Altenberg offers a very good and short summary about Preemt-RT and Xenomai.





Quicklinks

Getting started

  1. Choose a machine. See Tested devices for reference
  2. Install a Linux distribution. You can use UNetbootin to create an bootable Live USB drive.
  3. To test the best possible RT performance compile a minimal preemt RT kernel
  4. If you are not satisfied with the performance of your system, tune your system.