[jauntywundrkind]

Agreed that you are deep into "you need to try & figure out" territory. The abstract theorycrafting has dug too deep, there's no good answers to such questions at this stage.

One of the best gems of insight available about how io_uring's work does get ran is Missing Manuals - io_uring worker pool, cloudflare writeup that at least sets the stage. https://blog.cloudflare.com/missing-manuals-io_uring-worker-...

Since you mention

> The non-async portions of a high level filesystem read operation appear rather trivial: checking for cache hits (page cache, dentry cache, etc), parsing the inode/dentry info, and the memcpy to userspace.

Worth maybe pointing out the slick work excuse has done to make her el ebpf a capable way to do a lot of base fs stuff. That userland can send in ebpf kernel programs to run various of fs task is pretty cool flexibility, and this work has shown colossal gains by having these formerly FUSE filesystems-in-usrwrland getting to author their own & send up their own ebpf to run various of these responsibilities, but now in kernel. https://github.com/extfuse/extfuse

Very much agreeing again though. Although the CF article highlights extremes, theres really a toolkit described to build io_uring processing as you'd like, shaping how many kernel threads & many other parameters as you please. It feels like there's been asking for specifics of how things work, but it keeps feeling like the answer is that it depends on how you opt to use it.