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PREEMPT_RT is a set of patches for the Linux kernel which implement real-time computing capabilities. It has not been merged into mainline Linux as of 2024.[1]


It has been developed since 2005.[2] In 2021, the preemption core locking code was merged.[3][4] In February 2023, Canonical released a real-time version of Ubuntu.[5]

MontaVista Software has been releasing a real-time Linux distribution containing the PREEMPT_RT patchset since the early 2000. Montavista's current main embedded Linux product, CGX, contains real-time preemption as a standard feature.


  1. ^ "The real realtime preemption end game". Retrieved 2023-11-16.
  2. ^ Reghenzani, Federico; Massari, Giuseppe; Fornaciari, William (2019-02-21). "The Real-Time Linux Kernel: A Survey on PREEMPT_RT". ACM Computing Surveys. 52 (1): 18:1–18:36. doi:10.1145/3297714. hdl:11311/1076057. ISSN 0360-0300.
  3. ^ "Realtime preemption locking core merged []". Retrieved 2023-02-09.
  4. ^ "The future of realtime Linux". Retrieved 2023-02-09.
  5. ^ Proven, Liam. "Real-time Ubuntu 22.04: What you need to know". The Register. Retrieved 2023-02-20.

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