[$] Ringing in a new asynchronous I/O API

While the kernel has had support for asynchronousI/O (AIO) since the 2.5development cycle, it has also had people complaining about AIO for aboutthat long. The current interface is seen as difficult to use andinefficient; additionally, some types of I/O are better supported thanothers. That situation may be about to change with the introduction of a proposednew interface from Jens Axboe called "io_uring". As might be expectedfrom the name, io_uring introduces just what the kernel needed more than anything else:yet another ring buffer.