Hussain: Lord of the io_uring

Shuveb Hussain has posted an extensive introduction to io_uring, complete with examples and a reference guide. "Because of the shared ring buffers between the kernel and user space, io_uring can be a zero-copy system. Copying bytes around becomes necessary when there are system calls that transfer data between kernel and user space are involved. But since the bulk of the communication in io_uring is via buffers shared between the kernel and user space, this huge performance overhead is completely avoided."

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