Processes that use io_uring
tend to keep a lot of balls in the air; being able to have many operations
underway at any given time is part of the point of that API in the first
place.  The io_uring subsystem must, as a result, keep track of a lot of
tasks that have to be performed at the right time.  In current kernels,
io_uring uses a standard kernel linked-list primitive to track those work
items.  As of the 7.2 kernel release, though, io_uring will, instead, use a
new lockless, multi-producer, single-consumer (MPSC) queue, resulting in
some notable performance gains.  Lockless algorithms tend to be tricky, but
the one used here is relatively approachable and shows how these algorithms
can work.

https://lwn.net/Articles/1081871/
--- SBBSecho 3.37-Linux
 * Origin: Palantir * palantirbbs.ddns.net * Pensacola, FL * (618:250/24)