On 9/14/21 3:38 PM, Pavel Begunkov wrote: > On 4/17/21 4:29 PM, Jens Axboe wrote: >> There's currently no way to experiment with polled IO with null_blk, >> which seems like an oversight. This patch adds support for polled IO. >> We keep a list of issued IOs on submit, and then process that list >> when mq_ops->poll() is invoked. > > That would be pretty useful to have. > > to fold in: > > diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c > index 5914fed8fa56..eb5cfe189e90 100644 > --- a/drivers/block/null_blk/main.c > +++ b/drivers/block/null_blk/main.c > @@ -1508,7 +1508,7 @@ static int null_poll(struct blk_mq_hw_ctx *hctx) > cmd = blk_mq_rq_to_pdu(req); > cmd->error = null_process_cmd(cmd, req_op(req), blk_rq_pos(req), > blk_rq_sectors(req)); > - nullb_complete_cmd(cmd); > + end_cmd(cmd); > nr++; > } Let's try again with that... -- Jens Axboe
