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++; } > > A new parameter is added, poll_queues. It defaults to 1 like the > submit queues, meaning we'll have 1 poll queue available. > > Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> > > --- -- Pavel Begunkov
