io_uring Looks Illegal

Linux IO usually means crossing into the kernel over and over again. io_uring changes the shape of that completely. Instead of asking the kernel to do one operation at a time, userspace and the kernel share two rings of memory: one for work, one for results. That one idea unlocks batching, completion-based I/O, SQPOLL, multishot operations, linked operations, registered buffers, provided buffers, and a very strange world where new I/O can be picked up without your program making another syscall. This video is a visual explanation of how `io_uring` works, why it looks illegal the first time you see it, and why it became one of the most important Linux interfaces of the last decade. Covered in the video: classic Linux I/O and syscall overhead submission queues and completion queues SQEs and CQEs batching SQPOLL multishot operations linked operations registered files and fixed buffers provided buffers the security and complexity tradeoffs #linux #systemsprogramming #iouring