From: Niklas Cassel <Niklas.Cassel@wdc.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: Bart Van Assche <bvanassche@acm.org>,
Damien Le Moal <Damien.LeMoal@wdc.com>,
Paolo Valente <paolo.valente@linaro.org>,
Niklas Cassel <Niklas.Cassel@wdc.com>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: [RFC PATCH 0/2] improve io scheduler callback triggering
Date: Fri, 27 Aug 2021 12:41:22 +0000 [thread overview]
Message-ID: <20210827124100.98112-1-Niklas.Cassel@wdc.com> (raw)
From: Niklas Cassel <niklas.cassel@wdc.com>
Recently, there were some extra "dummy" data added into mq-deadline
rq->elv.priv, that was there for the solve purpose of working around
shortcomings in blk-mq (which called the scheduler callbacks even
for requests that bypassed the scheduler).
Fix blk-mq to behave in a more sane way with regards to scheduler
callback triggering, and remove the now unneeded rq->elv.priv magic.
BFQ should be able to perform a similar cleanup, and should be able
to drop this comment from the code:
https://github.com/torvalds/linux/blob/master/block/bfq-iosched.c#L6456-L6462
Considering that I'm quite unfamiliar with the BFQ code, I'd rather
someone who is a bit more familiar with BFQ performs that cleanup.
Kind regards,
Niklas
Niklas Cassel (2):
blk-mq: don't call callbacks for requests that bypassed the scheduler
Revert "mq-deadline: Fix request accounting"
block/blk-mq-sched.c | 20 ++++++++++++++++++++
block/blk-mq.c | 13 -------------
block/mq-deadline.c | 16 +++++-----------
include/linux/blkdev.h | 3 ++-
4 files changed, 27 insertions(+), 25 deletions(-)
--
2.31.1
next reply other threads:[~2021-08-27 12:41 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-27 12:41 Niklas Cassel [this message]
2021-08-27 12:41 ` [RFC PATCH 1/2] blk-mq: don't call callbacks for requests that bypassed the scheduler Niklas Cassel
2021-08-27 13:28 ` Ming Lei
2021-08-30 9:48 ` Niklas Cassel
2021-08-30 10:11 ` Ming Lei
2021-09-07 12:59 ` Niklas Cassel
2021-08-27 12:41 ` [RFC PATCH 2/2] Revert "mq-deadline: Fix request accounting" Niklas Cassel
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