From 85003a446e9d058c9c3e6cfa5d991ace07330a68 Mon Sep 17 00:00:00 2001 From: Adam Manzanares Date: Tue, 4 Apr 2017 08:25:14 -0700 Subject: block: fix inheriting request priority from bio In 4.10 I introduced a patch that associates the ioc priority with each request in the block layer. This work was done in the single queue block layer code. This patch unifies ioc priority to request mapping across the single/multi queue block layers. I have tested this patch with the null block device driver with the following parameters. null_blk queue_mode=2 irqmode=0 use_per_node_hctx=1 nr_devices=1 I have not seen a performance regression with this patch and I would appreciate any feedback or additional testing. I have also verified that io priorities are passed to the device when using the SQ and MQ path to a SATA HDD that supports io priorities. Reviewed-by: Christoph Hellwig Signed-off-by: Adam Manzanares Reviewed-by: Bart Van Assche Signed-off-by: Jens Axboe --- block/blk-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/blk-core.c b/block/blk-core.c index 43b7d06ced695..316a5399fb15a 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1149,7 +1149,6 @@ static struct request *__get_request(struct request_list *rl, unsigned int op, blk_rq_init(q, rq); blk_rq_set_rl(rq, rl); - blk_rq_set_prio(rq, ioc); rq->cmd_flags = op; rq->rq_flags = rq_flags; @@ -1636,6 +1635,7 @@ void init_request_from_bio(struct request *req, struct bio *bio) req->errors = 0; req->__sector = bio->bi_iter.bi_sector; + blk_rq_set_prio(req, rq_ioc(bio)); if (ioprio_valid(bio_prio(bio))) req->ioprio = bio_prio(bio); blk_rq_bio_prep(req->q, req, bio); -- cgit v1.2.3