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Thu, 25 Sep 2025 19:38:29 -0700 (PDT) Received: from localhost.localdomain ([116.128.244.171]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3341be2073dsm7269825a91.19.2025.09.25.19.38.25 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Thu, 25 Sep 2025 19:38:28 -0700 (PDT) From: chengkaitao To: axboe@kernel.dk Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, chengkaitao Subject: [PATCH RESEND] block/mq-deadline: adjust the timeout period of the per_prio->dispatch Date: Fri, 26 Sep 2025 10:38:18 +0800 Message-ID: <20250926023818.16223-1-pilgrimtao@gmail.com> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: chengkaitao Reference function started_after() Before modification: Timeout for dispatch{read}: 9.5s started_after - 0.5s < latest_start - 10s 9.5s < latest_start - started_after Timeout for dispatch{write}: 5s started_after - 5s < latest_start - 10s 5s < latest_start - started_after At this point, write requests have higher priority than read requests. After modification: Timeout for dispatch{read/write}: 5s prio_aging_expire / 2 < latest_start - started_after Signed-off-by: chengkaitao --- block/mq-deadline.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/block/mq-deadline.c b/block/mq-deadline.c index b9b7cdf1d3c9..f311168f8dfe 100644 --- a/block/mq-deadline.c +++ b/block/mq-deadline.c @@ -672,7 +672,8 @@ static void dd_insert_request(struct blk_mq_hw_ctx *hct= x, struct request *rq, =20 if (flags & BLK_MQ_INSERT_AT_HEAD) { list_add(&rq->queuelist, &per_prio->dispatch); - rq->fifo_time =3D jiffies; + rq->fifo_time =3D jiffies + dd->fifo_expire[data_dir] + - dd->prio_aging_expire / 2; } else { deadline_add_rq_rb(per_prio, rq); =20 --=20 2.50.1 (Apple Git-155)