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Htop too
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this post was submitted on 16 Feb 2024
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Tickless means it’s not based on the computer frequency and idle CPUs can stay idle rather than being annoyingly brought into high power mode ever 100 Hz, but it’s still firing interrupts based on scaling timed variables.
They’re now called “Dynticks”
SUSE wrote the vaguely more understandable write up that Linux foundation links to: https://www.suse.com/c/cpu-isolation-full-dynticks-part2/
BTW, the Linux RCU code is evil but interesting: https://www.p99conf.io/session/how-to-avoid-learning-the-linux-kernel-memory-model/
Fascinating stuff. Obviously a lot has changed since I took an undergrad OS class lol. Hell, Linux didn't even exist back then.