Preempt_RT is a set of patches for the Linux kernel. 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. 
From 2024 on Preemp-RT was fully merged and enabled in mainline Linux for popular architectures.

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 Build a Preempt-RT Kernel with minimal configuration

  4. Tune some BIOS settings

  5. Measure the best possible RT performance of your system

  6. Compile a full preempt RT kernel

  7. Test your system

  8. Test your system with stress tests

  9. If you are not satisfied with the performance of your system, tune your system.

Examples

https://www.toradex.com/community/questions/486/how-to-build-real-time-kernel-for-apalis-imx6.html

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