linux-kernel - [PATCH 15/17] ublk: don't access ublk_queue in ublk_need_complete

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Message-ID: <20250918014953.297897-16-csander@purestorage.com>
Date: Wed, 17 Sep 2025 19:49:51 -0600
From: Caleb Sander Mateos <csander@...estorage.com>
To: Ming Lei <ming.lei@...hat.com>,
	Jens Axboe <axboe@...nel.dk>
Cc: linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Caleb Sander Mateos <csander@...estorage.com>
Subject: [PATCH 15/17] ublk: don't access ublk_queue in ublk_need_complete_req()

For ublk servers with many ublk queues, accessing the ublk_queue in
ublk_need_complete_req() is a frequent cache miss. Get the flags from
the ublk_device instead, which is accessed earlier in
ublk_ch_uring_cmd_local().

Signed-off-by: Caleb Sander Mateos <csander@...estorage.com>
---
 drivers/block/ublk_drv.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index b92b7823005d..750d0a332685 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -2265,14 +2265,14 @@ static int ublk_check_commit_and_fetch(const struct ublk_device *ub,
 	}
 
 	return 0;
 }
 
-static bool ublk_need_complete_req(const struct ublk_queue *ubq,
+static bool ublk_need_complete_req(const struct ublk_device *ub,
 				   struct ublk_io *io)
 {
-	if (ublk_need_req_ref(ubq))
+	if (ublk_dev_need_req_ref(ub))
 		return ublk_sub_req_ref(io);
 	return true;
 }
 
 static bool ublk_get_data(const struct ublk_queue *ubq, struct ublk_io *io,
@@ -2385,11 +2385,11 @@ static int ublk_ch_uring_cmd_local(struct io_uring_cmd *cmd,
 		if (ret)
 			goto out;
 		io->res = result;
 		req = ublk_fill_io_cmd(io, cmd);
 		ret = ublk_config_io_buf(ub, io, cmd, addr, &buf_idx);
-		compl = ublk_need_complete_req(ubq, io);
+		compl = ublk_need_complete_req(ub, io);
 
 		/* can't touch 'ublk_io' any more */
 		if (buf_idx != UBLK_INVALID_BUF_IDX)
 			io_buffer_unregister_bvec(cmd, buf_idx, issue_flags);
 		if (req_op(req) == REQ_OP_ZONE_APPEND)
-- 
2.45.2