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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 0/4] Restore I/O priority support in the mq-deadline scheduler
Date: Thu, 23 Sep 2021 16:23:54 -0700	[thread overview]
Message-ID: <20210923232358.3907118-1-bvanassche@acm.org> (raw)

Hi Jens,

This patch series includes the following changes:
- 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.

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 | 221 ++++++++++++++++++++++++++++----------------
 1 file changed, 143 insertions(+), 78 deletions(-)


             reply	other threads:[~2021-09-23 23:24 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-23 23:23 Bart Van Assche [this message]
2021-09-23 23:26 ` [PATCH 1/4] block/mq-deadline: Improve request accounting further Bart Van Assche
2021-09-23 23:26   ` [PATCH 2/4] block/mq-deadline: Add an invariant check Bart Van Assche
2021-09-24 10:54     ` Damien Le Moal
2021-09-27 15:53     ` Niklas Cassel
2021-09-23 23:26   ` [PATCH 3/4] block/mq-deadline: Stop using per-CPU counters Bart Van Assche
2021-09-24 10:58     ` Damien Le Moal
2021-09-25  2:59       ` Bart Van Assche
2021-09-27  0:19         ` Damien Le Moal
2021-09-27  2:38           ` Bart Van Assche
2021-09-27  3:41             ` Damien Le Moal
2021-09-27 15:53     ` Niklas Cassel
2021-09-23 23:26   ` [PATCH 4/4] block/mq-deadline: Prioritize high-priority requests Bart Van Assche
2021-09-24 11:08     ` Damien Le Moal
2021-09-27 20:03       ` Bart Van Assche
2021-09-24 10:54   ` [PATCH 1/4] block/mq-deadline: Improve request accounting further Damien Le Moal
2021-09-27 15:53   ` Niklas Cassel

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