PID 0 is the most misunderstood figure in the world of Unix PIDs, with misinformation and confusion rampant across the web. Despite common misbeliefs, PID 0 does exist, serving as the kernel’s caretaker with responsibilities in the realms of process scheduling and power management. The history of PID 0 in Unix dates back to earlier kernels and versions, showcasing consistent patterns in how it operates. The article dives into the complexities of the Linux kernel’s structuring and highlights the discrepancies between kernel and userspace interpretations of PIDs, adding to the confusion surrounding PID 0’s true identity.
https://blog.dave.tf/post/linux-pid0/