Re:List of Open Source Real-Time Operating Systems
by zozbot123 on Saturday February 09, 2019 @09:33AM
(#19122444)
AIUI the plan is to merge the patchset itself into mainline to ease the maintenance burden, but to keep the changes that don't actually make sense for mainstream server use under a special config/#define flag, PREEMPT_RT_FULL or similar. It will then be up to users/distributors whether to enable it. I've only tried the current patchset casually, but IME, the throughput penalty is there but is barely perceptible for casual use, and the improved responsiveness due to kernel thread preemption and the priority inversion fix do make the system a lot more usable especially under load.
https://rt.wiki.kernel.org/index.php/Main_Page
This is the wiki for the PREEMPT_RT patchset. Parts of this have been moving into mainline for years, bringing the regular kernel closer and closer to real-time. However, there are some real-time features that will never be appropriate for mainline, so you can get them through this patchset. Some of the "famous" kernel devs are also very active in PREEMPT-RT; it's as official as you can get short of being in the mainline kernel.
For lots of uses, the regular kernel is already realtime enough.