blk-mq: introduce new queue attribute async_depth
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 | |
Subject: | [PATCH 0/7] blk-mq: introduce new queue attribute async_depth | |
Date: | Tue, 30 Sep 2025 15:11:04 +0800 | |
Message-ID: | <20250930071111.1218494-1-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> 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 | 10 ++++++ block/bfq-iosched.c | 45 +++++++++++--------------- block/blk-core.c | 1 + block/blk-mq-sched.h | 5 +++ block/blk-mq.c | 4 +++ block/blk-sysfs.c | 47 ++++++++++++++++++++++++++++ block/elevator.c | 1 + block/kyber-iosched.c | 36 ++------------------- block/mq-deadline.c | 42 ++----------------------- include/linux/blkdev.h | 3 +- 10 files changed, 94 insertions(+), 100 deletions(-) -- 2.39.2