On 6/21/20 4:30 AM, Pavel Begunkov wrote: > Because of need_resched() check, io_uring_enter() -> io_iopoll_check() > can return 0 even if @min_complete wasn't satisfied. If that's the > case, __io_uring_get_cqe() sets submit=0 and wait_nr=0, disabling > setting IORING_ENTER_GETEVENTS as well. So, it goes crazy calling > io_uring_enter() in a loop, not actually submitting nor polling. > > Set @wait_nr based on actual number of CQEs ready. > BTW, atomic_load_acquire() in io_uring_cq_ready() can be replaced > with a relaxed one for this particular place. Can you preface this with an addition of __io_uring_cqe_ready() that doesn't include the load acquire? Also, s/io_adjut_wait_nr/io_adjust_wait_nr for the patch. -- Jens Axboe
