From: Bart Van Assche <bvanassche@acm.org>
To: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
Jaegeuk Kim <jaegeuk@kernel.org>,
Bart Van Assche <bvanassche@acm.org>
Subject: [PATCH 00/14] Improve I/O priority support
Date: Tue, 8 Jun 2021 16:06:49 -0700 [thread overview]
Message-ID: <20210608230703.19510-1-bvanassche@acm.org> (raw)
Hi Jens,
A feature that is missing from the Linux kernel for storage devices that
support I/O priorities is to set the I/O priority in requests involving page
cache writeback. Since the identity of the process that triggers page cache
writeback is not known in the writeback code, the priority set by ioprio_set()
is ignored. However, an I/O cgroup is associated with writeback requests
by certain filesystems. Hence this patch series that implements the following
changes:
* Add an rq-qos policy that makes the I/O priority configurable per I/O cgroup
and also that changes the I/O priority of requests to the lower of (request
I/O priority, cgroup I/O priority).
* Introduce one queue per I/O priority in the mq-deadline scheduler.
* Dispatch the highest priority requests first.
Please consider this patch series for kernel v5.14.
Thanks,
Bart.
Changes compared to v1:
- Moved the code for assigning an I/O priority into a new rq-qos policy.
- Dropped patch "block/mq-deadline: Reduce the read expiry time for
non-rotational media".
- Made sure that dd->async_depth >= 1.
- Implemented an aging mechanism such that lower priority requests are not
postponed forever.
Bart Van Assche (14):
block/Kconfig: Make the BLK_WBT and BLK_WBT_MQ entries consecutive
block/blk-cgroup: Swap the blk_throtl_init() and blk_iolatency_init()
calls
block/blk-rq-qos: Move a function from a header file into a C file
block: Introduce the ioprio rq-qos policy
block/mq-deadline: Add several comments
block/mq-deadline: Add two lockdep_assert_held() statements
block/mq-deadline: Remove two local variables
block/mq-deadline: Rename dd_init_queue() and dd_exit_queue()
block/mq-deadline: Improve compile-time argument checking
block/mq-deadline: Improve the sysfs show and store macros
block/mq-deadline: Reserve 25% of scheduler tags for synchronous
requests
block/mq-deadline: Add I/O priority support
block/mq-deadline: Add cgroup support
block/mq-deadline: Prioritize high-priority requests
Documentation/admin-guide/cgroup-v2.rst | 26 +
block/Kconfig | 19 +-
block/Kconfig.iosched | 6 +
block/Makefile | 3 +
block/blk-cgroup.c | 14 +-
block/blk-ioprio.c | 236 +++++
block/blk-ioprio.h | 19 +
block/blk-rq-qos.c | 15 +
block/blk-rq-qos.h | 14 +-
block/mq-deadline-cgroup.c | 185 ++++
block/mq-deadline-cgroup.h | 112 +++
block/mq-deadline-main.c | 1171 +++++++++++++++++++++++
block/mq-deadline.c | 815 ----------------
13 files changed, 1798 insertions(+), 837 deletions(-)
create mode 100644 block/blk-ioprio.c
create mode 100644 block/blk-ioprio.h
create mode 100644 block/mq-deadline-cgroup.c
create mode 100644 block/mq-deadline-cgroup.h
create mode 100644 block/mq-deadline-main.c
delete mode 100644 block/mq-deadline.c
next reply other threads:[~2021-06-08 23:07 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-08 23:06 Bart Van Assche [this message]
2021-06-08 23:06 ` [PATCH 01/14] block/Kconfig: Make the BLK_WBT and BLK_WBT_MQ entries consecutive Bart Van Assche
2021-06-09 4:14 ` Damien Le Moal
2021-06-09 7:03 ` Johannes Thumshirn
2021-06-10 6:02 ` Hannes Reinecke
2021-06-08 23:06 ` [PATCH 02/14] block/blk-cgroup: Swap the blk_throtl_init() and blk_iolatency_init() calls Bart Van Assche
2021-06-09 4:19 ` Damien Le Moal
2021-06-09 7:05 ` Johannes Thumshirn
2021-06-10 6:02 ` Hannes Reinecke
2021-06-08 23:06 ` [PATCH 03/14] block/blk-rq-qos: Move a function from a header file into a C file Bart Van Assche
2021-06-09 4:22 ` Damien Le Moal
2021-06-10 6:03 ` Hannes Reinecke
2021-06-08 23:06 ` [PATCH 04/14] block: Introduce the ioprio rq-qos policy Bart Van Assche
2021-06-09 4:40 ` Damien Le Moal
2021-06-09 16:48 ` Bart Van Assche
2021-06-10 0:29 ` Damien Le Moal
2021-06-10 6:20 ` Hannes Reinecke
2021-06-10 17:14 ` Bart Van Assche
2021-06-08 23:06 ` [PATCH 05/14] block/mq-deadline: Add several comments Bart Van Assche
2021-06-10 6:21 ` Hannes Reinecke
2021-06-08 23:06 ` [PATCH 06/14] block/mq-deadline: Add two lockdep_assert_held() statements Bart Van Assche
2021-06-10 6:21 ` Hannes Reinecke
2021-06-08 23:06 ` [PATCH 07/14] block/mq-deadline: Remove two local variables Bart Van Assche
2021-06-10 6:22 ` Hannes Reinecke
2021-06-08 23:06 ` [PATCH 08/14] block/mq-deadline: Rename dd_init_queue() and dd_exit_queue() Bart Van Assche
2021-06-08 23:06 ` [PATCH 09/14] block/mq-deadline: Improve compile-time argument checking Bart Van Assche
2021-06-08 23:06 ` [PATCH 10/14] block/mq-deadline: Improve the sysfs show and store macros Bart Van Assche
2021-06-09 4:46 ` Damien Le Moal
2021-06-09 16:54 ` Bart Van Assche
2021-06-10 0:31 ` Damien Le Moal
2021-06-09 7:11 ` Johannes Thumshirn
2021-06-09 16:59 ` Bart Van Assche
2021-06-10 6:23 ` Hannes Reinecke
2021-06-08 23:07 ` [PATCH 11/14] block/mq-deadline: Reserve 25% of scheduler tags for synchronous requests Bart Van Assche
2021-06-10 6:26 ` Hannes Reinecke
2021-06-08 23:07 ` [PATCH 12/14] block/mq-deadline: Add I/O priority support Bart Van Assche
2021-06-09 5:03 ` Damien Le Moal
2021-06-09 17:25 ` Bart Van Assche
2021-06-10 0:39 ` Damien Le Moal
2021-06-10 6:35 ` Hannes Reinecke
2021-06-08 23:07 ` [PATCH 13/14] block/mq-deadline: Add cgroup support Bart Van Assche
2021-06-10 6:37 ` Hannes Reinecke
2021-06-08 23:07 ` [PATCH 14/14] block/mq-deadline: Prioritize high-priority requests Bart Van Assche
2021-06-09 5:10 ` Damien Le Moal
2021-06-10 6:43 ` Hannes Reinecke
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