Hello, I was wondering if I could set up SQPOLL for fuse/IORING_OP_URING_CMD and what would be the latency win. Now I get a bit confused what the f_op->uring_cmd_iopoll() function is supposed to do. Is it just there to check if SQEs are can be completed as CQE? In rw.c io_do_iopoll() it looks like this. I don't follow all code paths in __io_sq_thread yet, but it looks a like it already checks if the ring has new entries to_submit = io_sqring_entries(ctx); ... ret = io_submit_sqes(ctx, to_submit); --> it will eventually call into ->uring_cmd() ? And then io_do_iopoll -> file->f_op->uring_cmd_iopoll is supposed to check for available cq entries and will submit these? I.e. I just return 1 if when the request is ready? And also ensure that req->iopoll_completed is set? I'm also not sure what I should do with struct io_comp_batch * - I don't have struct request *req_list anywhere in my fuse-uring changes, seems to be blk-mq specific? So I should just ignore that parameter? Btw, this might be useful for ublk as well? Thanks, Bernd
