Recently we've started using io_uring for disk access in QuestDB. So far, it's being used in CSV import, but we'd like to expand it to network and other disk access use cases. Apart from the performance boost, the beauty of io_uring is that it allows one to build an event loop on a single I/O multiplexing mechanism. No need to build an ugly combination of epoll and AIO or anything like that - it supports networking, disk access, user events (eventfd), and timers (and not only).