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blk-mq: issue directly with bypass 'false' in blk_mq_sched_insert_requests 

It is not necessary to issue request directly with bypass 'true'
in blk_mq_sched_insert_requests and handle the non-issued requests
itself. Just set bypass to 'false' and let blk_mq_try_issue_directly
handle them totally. Remove the blk_rq_can_direct_dispatch check,
because blk_mq_try_issue_directly can handle it well.If request is
direct-issued unsuccessfully, insert the reset.

Signed-off-by: Jianchao Wang <jianchao.w.wang@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jianchao Wang 2018-12-14 09:28:19 +08:00 committed by Jens Axboe
parent 7f556a44e6
commit 5b7a6f128a
2 changed files with 12 additions and 16 deletions
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8
block/blk-mq-sched.c
View File

@ -417,12 +417,10 @@ void blk_mq_sched_insert_requests(struct blk_mq_hw_ctx *hctx,
* 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);

20
block/blk-mq.c
View File

@ -1874,22 +1874,20 @@ blk_status_t blk_mq_request_issue_directly(struct request *rq, bool last)
void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
struct list_head *list)
{
blk_qc_t unused;
blk_status_t ret = BLK_STS_OK;
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, list_empty(list));
if (ret != BLK_STS_OK) {
if (ret == BLK_STS_RESOURCE ||
ret == BLK_STS_DEV_RESOURCE) {
blk_mq_request_bypass_insert(rq,
if (ret == BLK_STS_OK)
ret = blk_mq_try_issue_directly(hctx, rq, &unused,
false,
list_empty(list));
break;
}
blk_mq_end_request(rq, ret);
}
else
blk_mq_sched_insert_request(rq, false, true, false);
}
/*
@ -1897,7 +1895,7 @@ void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
* the driver there was more coming, but that turned out to
* be a lie.
*/
if (!list_empty(list) && hctx->queue->mq_ops->commit_rqs)
if (ret != BLK_STS_OK && hctx->queue->mq_ops->commit_rqs)
hctx->queue->mq_ops->commit_rqs(hctx);
}