| From: |
| Yu Kuai <yukuai1-AT-huaweicloud.com> |
| To: |
| axboe-AT-kernel.dk, bvanassche-AT-acm.org, ming.lei-AT-redhat.com, nilay-AT-linux.ibm.com, jmoyer-AT-redhat.com |
| Subject: |
| [patch v2 0/7] blk-mq: introduce new queue attribute async_depth |
| Date: |
| Thu, 09 Oct 2025 15:46:27 +0800 |
| Message-ID: |
| <20251009074634.527661-1-yukuai1@huaweicloud.com> |
| Cc: |
| linux-block-AT-vger.kernel.org, linux-kernel-AT-vger.kernel.org, yukuai3-AT-huawei.com, yukuai1-AT-huaweicloud.com, yi.zhang-AT-huawei.com, yangerkun-AT-huawei.com, johnny.chenyi-AT-huawei.com |
| Archive-link: |
| Article |
From: Yu Kuai <yukuai3@huawei.com>
Changes in v2:
- keep limit_depth() method for kyber and mq-deadline in patch 3;
- add description about sysfs api change for kyber and mq-deadline;
- improve documentation in patch 7;
- add review tag for patch 1;
Background and motivation:
At first, we test a performance regression from 5.10 to 6.6 in
downstream kernel(described in patch 5), 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.
patch 1-3 add new queue attribute async_depth;
patch 4 convert kyber to use request_queue->async_depth;
patch 5 covnert mq-dedaline to use request_queue->async_depth, also the
performance regression will be fixed;
patch 6 convert bfq to use request_queue->async_depth;
Yu Kuai (7):
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: add documentation for new queue attribute async_dpeth
Documentation/ABI/stable/sysfs-block | 34 +++++++++++++++
block/bfq-iosched.c | 45 ++++++++-----------
block/blk-core.c | 1 +
block/blk-mq-sched.h | 5 +++
block/blk-mq.c | 64 +++++++++++++++++-----------
block/blk-sysfs.c | 47 ++++++++++++++++++++
block/elevator.c | 1 +
block/kyber-iosched.c | 33 +++-----------
block/mq-deadline.c | 39 +++--------------
include/linux/blkdev.h | 3 +-
10 files changed, 157 insertions(+), 115 deletions(-)
--
2.39.2
