linux-kernel - [PATCH 00/16] blk-mq: introduce new queue attribute asyc

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Message-Id: <20250814033522.770575-1-yukuai1@huaweicloud.com>
Date: Thu, 14 Aug 2025 11:35:06 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: axboe@...nel.dk,
	yukuai3@...wei.com,
	bvanassche@....org,
	nilay@...ux.ibm.com,
	hare@...e.de,
	ming.lei@...hat.com
Cc: linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	yukuai1@...weicloud.com,
	yi.zhang@...wei.com,
	yangerkun@...wei.com,
	johnny.chenyi@...wei.com
Subject: [PATCH 00/16] blk-mq: introduce new queue attribute asyc_dpeth

From: Yu Kuai <yukuai3@...wei.com>

Backgroud and motivation:

At first, we test a performance regression from 5.10 to 6.6 in
downstream kernel(described in patch 13), the regression is related to
async_depth in mq-dealine.

While trying to fix this regression, Bart suggests add a new attribute
to request_queue, and I think this is a good idea because all elevators
have similar logical, however only mq-deadline allow user to configure
async_depth. And this is patch 9-16, where the performance problem is
fixed in patch 13;

Because async_depth is related to nr_requests, while reviewing related
code, patch 2-7 are cleanups and fixes to nr_reqeusts.

I was planning to send this set for the next merge window, however,
during test I found the last block pr(6.17-rc1) introduce a regression
if nr_reqeusts grows, exit elevator will panic, and I fix this by
patch 1,8.

So I send this set for now, and hope we can consider it for this merge
window. If not, I'll have to rework the whole set and send the second
kernel panic regression first.

Yu Kuai (16):
  blk-mq-sched: add new parameter nr_requests in
    blk_mq_alloc_sched_tags()
  blk-mq: remove useless checking from queue_requests_store()
  blk-mq: remove useless checkings from blk_mq_update_nr_requests()
  blk-mq: check invalid nr_requests in queue_requests_store()
  blk-mq: fix elevator depth_updated method
  blk-mq: cleanup shared tags case in blk_mq_update_nr_requests()
  blk-mq: split bitmap grow and resize case in
    blk_mq_update_nr_requests()
  blk-mq: fix blk_mq_tags double free while nr_requests grown
  block: convert nr_requests to unsigned int
  blk-mq-sched: unify elevators checking for async requests
  blk-mq: add a new queue sysfs attribute async_depth
  kyber: covert to use request_queue->async_depth
  mq-deadline: covert to use request_queue->async_depth
  block, bfq: convert to use request_queue->async_depth
  blk-mq: fix stale nr_requests documentation
  blk-mq: add documentation for new queue attribute async_dpeth

 Documentation/ABI/stable/sysfs-block | 24 ++++---
 block/bfq-iosched.c                  | 64 +++++++------------
 block/blk-core.c                     |  1 +
 block/blk-mq-sched.c                 | 14 +++--
 block/blk-mq-sched.h                 | 18 +++++-
 block/blk-mq-tag.c                   | 23 +------
 block/blk-mq.c                       | 93 +++++++++++++++++-----------
 block/blk-mq.h                       |  2 +-
 block/blk-sysfs.c                    | 63 ++++++++++++++++++-
 block/elevator.c                     |  3 +-
 block/elevator.h                     |  2 +-
 block/kyber-iosched.c                | 40 ++----------
 block/mq-deadline.c                  | 55 ++--------------
 include/linux/blkdev.h               |  3 +-
 14 files changed, 194 insertions(+), 211 deletions(-)

-- 
2.39.2