There are several independent parts in the patchset, but bundled to make a point. 1-2: random stuff, that implicitly used later. 3-5: restore @nxt propagation 6-8: optimise locking in io_worker_handle_work() 9: optimise io_uring refcounting The next propagation bits are done similarly as it was before, but - nxt stealing is now at top-level, but not hidden in handlers - ensure there is no with REQ_F_DONT_STEAL_NEXT [6-8] is the reason to dismiss the previous @nxt propagation appoach, I didn't found a good way to do the same. Even though it looked clearer and without new flag. Performance tested it with link-of-nops + IOSQE_ASYNC: link size: 100 orig: 501 (ns per nop) 0-8: 446 0-9: 416 link size: 10 orig: 826 0-8: 776 0-9: 756 Pavel Begunkov (9): io_uring: clean up io_close io-wq: fix IO_WQ_WORK_NO_CANCEL cancellation io_uring: make submission ref putting consistent io_uring: remove @nxt from handlers io_uring: get next req on subm ref drop io-wq: shuffle io_worker_handle_work() code io-wq: io_worker_handle_work() optimise locking io-wq: optimise double lock for io_get_next_work() io_uring: pass submission ref to async fs/io-wq.c | 162 ++++++++++++---------- fs/io_uring.c | 366 ++++++++++++++++++++++---------------------------- 2 files changed, 258 insertions(+), 270 deletions(-) -- 2.24.0
