[PATCH V2 2/3] blk-mq: issue directly with bypass 'false' in blk_mq_sched_insert_requests

From: Jianchao Wang
Date: Fri Oct 26 2018 - 04:03:02 EST


It is not necessary to issue request directly with bypass 'true' in
blk_mq_sched_insert_requests and insert the non-issued requests
itself. Just set bypass to 'false' and let blk_mq_try_issue_directly
handle them.

Signed-off-by: Jianchao Wang <jianchao.w.wang@xxxxxxxxxx>
---
block/blk-mq-sched.c | 8 +++-----
block/blk-mq.c | 10 +---------
2 files changed, 4 insertions(+), 14 deletions(-)

diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index 29bfe80..23cd97e 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -411,12 +411,10 @@ void blk_mq_sched_insert_requests(struct request_queue *q,
* 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) {
+ 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);
+ else
+ blk_mq_insert_requests(hctx, ctx, list);
}

blk_mq_run_hw_queue(hctx, run_queue_async);
diff --git a/block/blk-mq.c b/block/blk-mq.c
index a81d2ca..71b829c 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1802,15 +1802,7 @@ void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
queuelist);

list_del_init(&rq->queuelist);
- ret = blk_mq_request_issue_directly(rq);
- if (ret != BLK_STS_OK) {
- if (ret == BLK_STS_RESOURCE ||
- ret == BLK_STS_DEV_RESOURCE) {
- list_add(&rq->queuelist, list);
- break;
- }
- blk_mq_end_request(rq, ret);
- }
+ ret = blk_mq_try_issue_directly(hctx, rq, NULL, false);
}
}

--
2.7.4