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{{Short description|Set of patches for Linux kernel}}
{{Short description|Set of patches for Linux kernel}}
{{DISPLAYTITLE:PREEMPT_RT}}
{{DISPLAYTITLE:PREEMPT_RT}}
'''PREEMPT_RT''' was a set of [[Patch (software)|patches]] for the [[Linux kernel]] which implement both hard and soft [[real-time computing]] capabilities.<ref>{{Cite web |title=20 years later, real-time Linux makes it to the kernel - really|url=https://www.zdnet.com/article/20-years-later-real-time-linux-makes-it-to-the-kernel-really/|access-date=2024-09-19 |website=[[zdnet.com]]}}</ref> On September 20, 2024, PREEMPT_RT was fully merged and enabled in [[mainline Linux]] on the supported architectures [[x86]], [[x86_64]], [[RISC-V]] and [[ARM64]].<ref>{{Cite web |title=Merge tag 'sched-rt-2024-09-17' - kernel/git/torvalds/linux.git - Linux kernel source tree |url=https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=baeb9a7d8b60b021d907127509c44507539c15e5 |access-date=2024-09-20 |website=git.kernel.org}}</ref> This will make kernel v6.12 the first release to include baked-in real-time capability.
'''PREEMPT_RT''' was a set of [[Patch (software)|patches]] for the [[Linux kernel]] which implement both hard and soft [[real-time computing]] capabilities.<ref>{{Cite web |title=20 years later, real-time Linux makes it to the kernel - really|url=https://www.zdnet.com/article/20-years-later-real-time-linux-makes-it-to-the-kernel-really/|access-date=2024-09-19 |website=[[zdnet.com]]}}</ref> On September 20, 2024, PREEMPT_RT was fully merged and enabled in [[mainline Linux]] on the supported architectures [[x86]], [[x86_64]], [[RISC-V]] and [[ARM64]].<ref>{{Cite web |title=Merge tag 'sched-rt-2024-09-17' - kernel/git/torvalds/linux.git - Linux kernel source tree |url=https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=baeb9a7d8b60b021d907127509c44507539c15e5 |access-date=2024-09-20 |website=git.kernel.org}}</ref> This will make kernel v6.12 the first release to include baked-in real-time capability. Support for [[LoongArch]] is added in v6.13.<ref>[https://lore.kernel.org/lkml/20241127091825.421126-1-chenhuacai@loongson.cn/ GIT PULL: LoongArch changes for v6.13]</ref>


== History ==
== History ==

Latest revision as of 12:50, 27 November 2024

PREEMPT_RT was a set of patches for the Linux kernel which implement both hard and soft real-time computing capabilities.[1] On September 20, 2024, PREEMPT_RT was fully merged and enabled in mainline Linux on the supported architectures x86, x86_64, RISC-V and ARM64.[2] This will make kernel v6.12 the first release to include baked-in real-time capability. Support for LoongArch is added in v6.13.[3]

History

[edit]

The PREEMPT_RT patchset has been in development since 2005.[4] In 2021, the preemption core locking code was merged.[5][6]

Since February 2023, Canonical has been releasing real-time versions of Ubuntu Pro, free for personal and small-scale commercial use in up to 5 machines.[7][8] The real-time kernel can be added to various existing Ubuntu releases through an enablement process.[8] These kernels include the PREEMPT_RT patchset and offer long-term support.[8]

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.

At the Sep. 2024 European Open Source Summit, Linus Torvalds announced that PREEMPT_RT had been accepted into the mainline linux kernel after a protracted development hurdle involving the printk kernel logging facility.

References

[edit]
  1. ^ "20 years later, real-time Linux makes it to the kernel - really". zdnet.com. Retrieved 2024-09-19.
  2. ^ "Merge tag 'sched-rt-2024-09-17' - kernel/git/torvalds/linux.git - Linux kernel source tree". git.kernel.org. Retrieved 2024-09-20.
  3. ^ GIT PULL: LoongArch changes for v6.13
  4. ^ 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.
  5. ^ "Realtime preemption locking core merged [LWN.net]". lwn.net. Retrieved 2023-02-09.
  6. ^ "The future of realtime Linux". LWN.net. Retrieved 2023-02-09.
  7. ^ Proven, Liam. "Real-time Ubuntu 22.04: What you need to know". The Register. Retrieved 2023-02-20.
  8. ^ a b c "Canonical releases Real-time Ubuntu 24.04 LTS". Ubuntu. Retrieved 2024-07-03.
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