[xoranth]

How would this interact with `io_uring`, especially the polling modes (IO_SETUP_SQPOLL, IO_SETUP_IOPOLL)?

[rwmj]

You still have to wait for your cache to reload from main memory, or for disk or network I/O, or for processes to be scheduled to run, so while it's likely more efficient than epoll approaches, I doubt there's any really fundamental difference in the performance problems you would find.