io_uring Boosts Performance with New Lockless MPSC FIFO Queues
Lockless MPSC FIFO queues for io_uring
Starting with the 7.2 kernel release, io_uring replaces its old linked-list approach with a new lockless multi-producer, single-consumer queue. This shift eliminates the need for complex list reversals and retry loops, significantly reducing cache contention. By adopting an algorithm credited to Dmitry Vyukov, the system achieves better fairness and faster task processing while maintaining a coherent state without traditional locking mechanisms.
Lockless algorithms tend to be tricky, but the one used here is relatively approachable and shows how these algorithms can work.