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 v2 0/4] Restore I/O priority support in the mq-deadline scheduler
Date: Mon, 27 Sep 2021 15:03:24 -0700 [thread overview]
Message-ID: <20210927220328.1410161-1-bvanassche@acm.org> (raw)
Hi Jens,
This patch series includes the following changes compared to the v5.14-r7
implementation:
- Fix request accounting by counting requeued requests once.
- Test correctness of the request accounting code by triggering a kernel
warning from inside dd_exit_sched() if an inconsistency has been detected.
- Switch from per-CPU counters to individual counters.
- Restore I/O priority support in the mq-deadline scheduler. The performance
measurements in the description of patch 4/4 show that the peformance
regressions in the previous version of this patch have been fixed. This has
been achieved by using 'jiffies' instead of ktime_get() and also by skipping
the aging mechanism if all queued requests have the same I/O priority.
Please consider this patch series for kernel v5.16.
Thanks,
Bart.
Changes compared to v1:
- Renamed 'aging_expire' into 'prio_aging_expire'.
- Renamed dd_dispatch_aged_requests() into dd_dispatch_prio_aged_requests().
- Adjusted a source code comment.
Bart Van Assche (4):
block/mq-deadline: Improve request accounting further
block/mq-deadline: Add an invariant check
block/mq-deadline: Stop using per-CPU counters
block/mq-deadline: Prioritize high-priority requests
block/mq-deadline.c | 220 ++++++++++++++++++++++++++++----------------
1 file changed, 143 insertions(+), 77 deletions(-)
next reply other threads:[~2021-09-27 22:03 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-27 22:03 Bart Van Assche [this message]
2021-09-27 22:03 ` [PATCH v2 1/4] block/mq-deadline: Improve request accounting further Bart Van Assche
2021-09-28 5:45 ` Hannes Reinecke
2021-09-27 22:03 ` [PATCH v2 2/4] block/mq-deadline: Add an invariant check Bart Van Assche
2021-09-28 5:47 ` Hannes Reinecke
2021-09-27 22:03 ` [PATCH v2 3/4] block/mq-deadline: Stop using per-CPU counters Bart Van Assche
2021-09-28 5:51 ` Hannes Reinecke
2021-09-28 17:35 ` Bart Van Assche
2021-09-27 22:03 ` [PATCH v2 4/4] block/mq-deadline: Prioritize high-priority requests Bart Van Assche
2021-09-27 22:53 ` Damien Le Moal
2021-09-27 23:12 ` Bart Van Assche
2021-09-28 5:53 ` Hannes Reinecke
2021-09-28 10:36 ` Niklas Cassel
2022-03-25 12:33 ` Oleksij Rempel
2022-03-25 13:07 ` Oleksij Rempel
2022-03-25 17:05 ` Bart Van Assche
2022-03-26 8:57 ` Oleksij Rempel
2022-03-28 2:20 ` Bart Van Assche
2022-03-28 22:24 ` Bart Van Assche
2022-03-29 4:49 ` Bart Van Assche
2021-09-27 23:14 ` [PATCH v2 0/4] Restore I/O priority support in the mq-deadline scheduler Jens Axboe
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