linux-kernel - [PATCH v2 3/5] blk-mq: support batched queue

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Message-Id: <20230913151616.3164338-4-chengming.zhou@linux.dev>
Date:   Wed, 13 Sep 2023 15:16:14 +0000
From:   chengming.zhou@...ux.dev
To:     axboe@...nel.dk, hch@....de, ming.lei@...hat.com,
        bvanassche@....org
Cc:     kbusch@...nel.org, mst@...hat.com,
        damien.lemoal@...nsource.wdc.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, chengming.zhou@...ux.dev,
        Chengming Zhou <zhouchengming@...edance.com>
Subject: [PATCH v2 3/5] blk-mq: support batched queue_rqs() on shared tags queue

From: Chengming Zhou <zhouchengming@...edance.com>

Since active requests have been accounted when allocate driver tags,
we can remove this limit now.

Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>
---
 block/blk-mq.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index c209a7dddee3..68ce9357463b 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2781,13 +2781,8 @@ void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule)
 		 * If we do, we can dispatch the whole plug list in one go. We
 		 * already know at this point that all requests belong to the
 		 * same queue, caller must ensure that's the case.
-		 *
-		 * Since we pass off the full list to the driver at this point,
-		 * we do not increment the active request count for the queue.
-		 * Bypass shared tags for now because of that.
 		 */
-		if (q->mq_ops->queue_rqs &&
-		    !(rq->mq_hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED)) {
+		if (q->mq_ops->queue_rqs) {
 			blk_mq_run_dispatch_ops(q,
 				__blk_mq_flush_plug_list(q, plug));
 			if (rq_list_empty(plug->mq_list))
-- 
2.40.1