Conversation
kernellogger@fosstodon.org

Thorsten Leemhuis (acct. 1/4)

aka the support for hit -next today! 🥳 👏

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/log/?qt=grep&q=PREEMPT_RT

Still remains to be seen if those changes really makes it upstream during the 6.12 merge window and stick:

* It afaics is still unclear if some prerequisites will be submitted for 6.12: https://lore.kernel.org/all/87ed5za2oj.fsf@jogness.linutronix.de/

* Troublemaking changes sometimes are reverted before the final, which in fact happened to some of printk prerequisites a while ago: https://lore.kernel.org/lkml/20220623145157.21938-6-pmladek@suse.com/

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schicho@infosec.exchange

Basti

Reply to @kernellogger@fosstodon.org

@kernellogger

I am not that well informed about kernel development, but I would like to know more. What exactly is so new and exciting about this new real-time code? Was real-time not possible before?

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kernellogger@fosstodon.org

Thorsten Leemhuis (acct. 1/4)

Reply to @schicho@infosec.exchange
Edited 3 months ago

@schicho

that's not easily summarized. Some starting points:

* https://lwn.net/Articles/989212/

* https://lwn.net/Articles/951337/

* https://lwn.net/Kernel/Index/#Realtime

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corbet

Jonathan Corbet

Reply to @schicho@infosec.exchange
@schicho @kernellogger The conventional wisdom since forever has been that *no* general-purpose operating-system kernel can provide realtime response (meaning that the highest-priority process is guaranteed to run within a defined maximum latency). The realtime preemption folks, after 20 years of work, have achieved that, at least if you are running on the right hardware. It is an impressive accomplishment
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