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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


             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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