BugLink: https://bugs.launchpad.net/bugs/1848739
In case of 'none' io scheduler, when hw queue isn't busy, it isn't
necessary to enqueue request to sw queue and dequeue it from
sw queue because request may be submitted to hw queue asap without
extra cost, meantime there shouldn't be much request in sw queue,
and we don't need to worry about effect on IO merge.
There are still some single hw queue SCSI HBAs(HPSA, megaraid_sas, ...)
which may connect high performance devices, so 'none' is often required
for obtaining good performance.
This patch improves IOPS and decreases CPU unilization on megaraid_sas,
per Kashyap's test.
Cc: Kashyap Desai <kashyap.desai@broadcom.com>
Cc: Laurence Oberman <loberman@redhat.com>
Cc: Omar Sandoval <osandov@fb.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Hannes Reinecke <hare@suse.de>
Reported-by: Kashyap Desai <kashyap.desai@broadcom.com>
Tested-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
(cherry picked from commit
6ce3dd6eec114930cf2035a8bcb1e80477ed79a8)
Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
if (e && e->type->ops.mq.insert_requests)
e->type->ops.mq.insert_requests(hctx, list, false);
if (e && e->type->ops.mq.insert_requests)
e->type->ops.mq.insert_requests(hctx, list, false);
+ else {
+ /*
+ * try to issue requests directly if the hw queue isn't
+ * busy in case of 'none' scheduler, and this way may save
+ * us one extra enqueue & dequeue to sw queue.
+ */
+ if (!hctx->dispatch_busy && !e && !run_queue_async) {
+ blk_mq_try_issue_list_directly(hctx, list);
+ if (list_empty(list))
+ return;
+ }
blk_mq_insert_requests(hctx, ctx, list);
blk_mq_insert_requests(hctx, ctx, list);
blk_mq_run_hw_queue(hctx, run_queue_async);
}
blk_mq_run_hw_queue(hctx, run_queue_async);
}
ret = q->mq_ops->queue_rq(hctx, &bd);
switch (ret) {
case BLK_STS_OK:
ret = q->mq_ops->queue_rq(hctx, &bd);
switch (ret) {
case BLK_STS_OK:
+ blk_mq_update_dispatch_busy(hctx, false);
*cookie = new_cookie;
break;
case BLK_STS_RESOURCE:
case BLK_STS_DEV_RESOURCE:
*cookie = new_cookie;
break;
case BLK_STS_RESOURCE:
case BLK_STS_DEV_RESOURCE:
+ blk_mq_update_dispatch_busy(hctx, true);
__blk_mq_requeue_request(rq);
break;
default:
__blk_mq_requeue_request(rq);
break;
default:
+ blk_mq_update_dispatch_busy(hctx, false);
*cookie = BLK_QC_T_NONE;
break;
}
*cookie = BLK_QC_T_NONE;
break;
}
+void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
+ struct list_head *list)
+{
+ while (!list_empty(list)) {
+ blk_status_t ret;
+ struct request *rq = list_first_entry(list, struct request,
+ queuelist);
+
+ list_del_init(&rq->queuelist);
+ ret = blk_mq_request_issue_directly(rq);
+ if (ret != BLK_STS_OK) {
+ list_add(&rq->queuelist, list);
+ break;
+ }
+ }
+}
+
static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio)
{
const int is_sync = op_is_sync(bio->bi_opf);
static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio)
{
const int is_sync = op_is_sync(bio->bi_opf);
blk_mq_try_issue_directly(data.hctx, same_queue_rq,
&cookie);
}
blk_mq_try_issue_directly(data.hctx, same_queue_rq,
&cookie);
}
- } else if (q->nr_hw_queues > 1 && is_sync) {
+ } else if ((q->nr_hw_queues > 1 && is_sync) || (!q->elevator &&
+ !data.hctx->dispatch_busy)) {
blk_mq_put_ctx(data.ctx);
blk_mq_bio_to_request(rq, bio);
blk_mq_try_issue_directly(data.hctx, rq, &cookie);
blk_mq_put_ctx(data.ctx);
blk_mq_bio_to_request(rq, bio);
blk_mq_try_issue_directly(data.hctx, rq, &cookie);
/* Used by blk_insert_cloned_request() to issue request directly */
blk_status_t blk_mq_request_issue_directly(struct request *rq);
/* Used by blk_insert_cloned_request() to issue request directly */
blk_status_t blk_mq_request_issue_directly(struct request *rq);
+void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
+ struct list_head *list);
/*
* CPU -> queue mappings
/*
* CPU -> queue mappings