From: Yu Kuai <yukuai3@huawei.com>
Changes in v3:
- use guard()/scope_guard() in patch 3;
- add review tag other than patch 3;
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 | 42 ++++++++++++++++++
block/elevator.c | 1 +
block/kyber-iosched.c | 33 +++-----------
block/mq-deadline.c | 39 +++--------------
include/linux/blkdev.h | 3 +-
10 files changed, 152 insertions(+), 115 deletions(-)
--
2.51.0