lsr: ls with io_uring

Why isn’t it possible — or is it — to make libc just use uring instead of syscall?

Yes I know uring is an async interface, but it’s trivial to implement sync behavior on top of a single chain of async send-wait pairs, like doing a simple single threaded “conversational” implementation of a network protocol.

It wouldn’t make a difference in most individual cases but overall I wonder how big a global speed boost you’d get by removing a ton of syscalls?

Or am I failing to understand something about the performance nuances here?

In addition to sibling's concern about syscall amplification, the async just isn't useful to the application (from a latency perspective) if you just serialize a bunch of sync requests through it.