linux-kernel - Re: [PATCH 7/8] mq-deadline: add blk-mq adaptation of the deadline IO scheduler

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Message-ID: <048a5a0a-1793-4698-4bc0-213d36fad161@fb.com>
Date:   Mon, 16 Jan 2017 18:47:19 -0800
From:   Jens Axboe <axboe@...com>
To:     Paolo Valente <paolo.valente@...aro.org>
CC:     Jens Axboe <axboe@...nel.dk>, <linux-block@...r.kernel.org>,
        Linux-Kernal <linux-kernel@...r.kernel.org>, <osandov@...com>
Subject: Re: [PATCH 7/8] mq-deadline: add blk-mq adaptation of the deadline IO
 scheduler

On 12/22/2016 09:49 AM, Paolo Valente wrote:
> 
>> Il giorno 17 dic 2016, alle ore 01:12, Jens Axboe <axboe@...com> ha scritto:
>>
>> This is basically identical to deadline-iosched, except it registers
>> as a MQ capable scheduler. This is still a single queue design.
>>
> 
> One last question (for today ...):in mq-deadline there are no
> "schedule dispatch" or "unplug work" functions.  In blk, CFQ and BFQ
> do these schedules/unplugs in a lot of cases.  What's the right
> replacement?  Just doing nothing?

You just use blk_mq_run_hw_queue() or variants thereof to kick off queue
runs.

-- 
Jens Axboe