Revisiting the kernel's preemption models (part 1)

Posted Sep 22, 2023 3:37 UTC (Fri) by josh (subscriber, #17465)
In reply to: Revisiting the kernel's preemption models (part 1) by mtodorov
Parent article: Revisiting the kernel's preemption models (part 1)

> However, I can see the need for that, i.e. in changing a battleship's computer's mode from "normal operation" in which performance and computing efficiency is preferred to a "battle mode" or "condition red" where latency would be a paramount for ship's survival.

Switching modes is a complex and error-prone operation that affects the operation of all other software, so the net effect of doing this on the verge of a critical situation would be to switch into a less-tested mode for all software. Such a mode switch would need to be regularly tested, but even such testing would not be as good as simply running in that mode all the time.