From: Jens Axboe <axboe@kernel.dk>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: Ulf Hansson <ulf.hansson@linaro.org>,
Paolo Valente <paolo.valente@linaro.org>,
Christoph Hellwig <hch@infradead.org>,
Arnd Bergmann <arnd@arndb.de>,
Bart Van Assche <bart.vanassche@sandisk.com>,
Jan Kara <jack@suse.cz>, Tejun Heo <tj@kernel.org>,
linux-block@vger.kernel.org,
Linux-Kernal <linux-kernel@vger.kernel.org>,
Mark Brown <broonie@kernel.org>, Hannes Reinecke <hare@suse.de>,
Grant Likely <grant.likely@secretlab.ca>,
James Bottomley <James.Bottomley@hansenpartnership.com>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Subject: Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler
Date: Fri, 28 Oct 2016 09:30:07 -0600 [thread overview]
Message-ID: <3d0b38bb-537d-94ff-574f-587bad949fdd@kernel.dk> (raw)
In-Reply-To: <CACRpkda0fmPdM2WZ_gtW=T7xvMfP_4ErtNZseExN2AggzZbcDQ@mail.gmail.com>
On 10/28/2016 03:32 AM, Linus Walleij wrote:
> The patch to enable MQ looks like this:
> https://git.kernel.org/cgit/linux/kernel/git/linusw/linux-stericsson.git/commit/?h=mmc-mq&id=8f79b527e2e854071d8da019451da68d4753f71d
BTW, another viable "hack" for the depth issue would be to expose more
than one hardware queue. It's meant to map to a distinct submission
region in the hardware, but there's nothing stopping the driver from
using it differently. Might not be cleaner than just increasing the
queue depth on a single queue, though.
That still won't solve the issue of lying about it and causing IO
scheduler confusion, of course.
Also, 4.8 and newer have support for BLK_MQ_F_BLOCKING, if you need to
block in ->queue_rq(). That could eliminate the need to offload to a
kthread manually.
--
Jens Axboe
next prev parent reply other threads:[~2016-10-28 15:30 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-26 9:27 [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler Paolo Valente
2016-10-26 9:27 ` [PATCH 01/14] block, bfq: " Paolo Valente
2016-10-26 9:27 ` [PATCH 02/14] block, bfq: add full hierarchical scheduling and cgroups support Paolo Valente
2016-10-26 9:27 ` [PATCH 03/14] block, bfq: improve throughput boosting Paolo Valente
2016-10-26 9:27 ` [PATCH 04/14] block, bfq: modify the peak-rate estimator Paolo Valente
2016-10-26 9:27 ` [PATCH 05/14] block, bfq: add more fairness with writes and slow processes Paolo Valente
2016-10-26 9:27 ` [PATCH 06/14] block, bfq: improve responsiveness Paolo Valente
2016-10-26 9:28 ` [PATCH 07/14] block, bfq: reduce I/O latency for soft real-time applications Paolo Valente
2016-10-26 9:28 ` [PATCH 08/14] block, bfq: preserve a low latency also with NCQ-capable drives Paolo Valente
2016-10-26 9:28 ` [PATCH 09/14] block, bfq: reduce latency during request-pool saturation Paolo Valente
2016-10-26 10:19 ` [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler Christoph Hellwig
2016-10-26 11:34 ` Jan Kara
2016-10-26 15:05 ` Bart Van Assche
2016-10-26 15:13 ` Arnd Bergmann
2016-10-26 15:29 ` Christoph Hellwig
2016-10-26 15:32 ` Jens Axboe
2016-10-26 16:04 ` Paolo Valente
2016-10-26 16:04 ` Paolo Valente
2016-10-26 16:12 ` Jens Axboe
2016-10-27 9:26 ` Jan Kara
2016-10-27 14:34 ` Grozdan
2016-10-27 15:55 ` Heinz Diehl
2016-10-27 16:28 ` Jens Axboe
2016-10-27 16:26 ` Jens Axboe
2016-10-28 7:59 ` Jan Kara
2016-10-28 14:10 ` Jens Axboe
2016-10-27 17:32 ` Ulf Hansson
2016-10-27 17:43 ` Jens Axboe
2016-10-27 18:13 ` Ulf Hansson
2016-10-27 18:21 ` Jens Axboe
2016-10-27 19:34 ` Ulf Hansson
2016-10-27 21:08 ` Jens Axboe
2016-10-27 22:27 ` Linus Walleij
2016-10-28 9:32 ` Linus Walleij
2016-10-28 9:32 ` Linus Walleij
2016-10-28 14:22 ` Jens Axboe
2016-10-28 20:38 ` Linus Walleij
2016-10-28 15:29 ` Christoph Hellwig
2016-10-28 15:29 ` Christoph Hellwig
2016-10-28 21:09 ` Linus Walleij
2016-10-28 21:09 ` Linus Walleij
2016-10-28 15:30 ` Jens Axboe [this message]
2016-10-28 15:58 ` Bartlomiej Zolnierkiewicz
2016-10-28 16:05 ` Arnd Bergmann
2016-10-28 17:17 ` Mark Brown
2016-10-28 14:07 ` Jens Axboe
2016-10-28 6:36 ` Ulf Hansson
2016-10-28 14:17 ` Jens Axboe
2016-10-28 17:12 ` Mark Brown
2016-10-27 19:41 ` Mark Brown
2016-10-27 19:45 ` Christoph Hellwig
2016-10-27 22:01 ` Mark Brown
2016-10-28 12:07 ` Arnd Bergmann
2016-10-28 12:17 ` Richard Weinberger
2016-10-29 5:38 ` Paolo Valente
2016-10-29 5:38 ` Paolo Valente
2016-10-29 13:12 ` Bart Van Assche
2016-10-29 13:12 ` Bart Van Assche
2016-10-29 14:12 ` Jens Axboe
2016-10-30 3:06 ` Paolo Valente
2016-10-30 3:06 ` Paolo Valente
2016-10-26 12:37 ` Paolo Valente
2016-10-26 12:37 ` Paolo Valente
-- strict thread matches above, loose matches on Subject: below --
2016-10-30 17:48 Manuel Krause
2016-10-29 17:08 Manuel Krause
2016-10-25 8:48 Paolo Valente
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