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What Is PID 0?
Yes, there's a PID 0! An explanation of what it is, and a quick walk through linux early boot code.
Going directly to the source of the LLM slop fared slightly better, on account of them having stolen from books as well as the web, but they still make shit up in the usual amount. Hard drives in this case, references in the kernel code as well as the Computer History wiki confirm that Bell Labs’s PDP-11 at the time ran an RS11 disk for the core OS and process swapping, and an RK03 for the user filesystem. PID 0 runs early kernel initialization, then becomes the bootstrap CPU core’s idle task, and plays a minor supporting role in scheduling and power management.
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