- Map a program’s IO buffers into the kernel; this prevents repeated mapping / unmapping.
- https://github.com/tokio-rs/io-uring exists
- Completions can be delivered or polled for. A fully-polled mode that lasts “forever” OR until one full idle second. The kernel will maintain a polling thread that delivers completions.
While the kernel has had support for asynchronous I/O (AIO) since the 2.5 development cycle, it has also had people complaining about AIO for about that long.
- What about epoll? How is AIO different from epoll?