linux-kernel - Re: [PATCH v6 1/3] block: Add iocontext priority to request

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Date:   Wed, 19 Oct 2016 12:08:13 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Tejun Heo <tj@...nel.org>,
        Adam Manzanares <adam.manzanares@...t.com>
Cc:     dan.j.williams@...el.com, hare@...e.de, martin.petersen@...cle.com,
        mchristi@...hat.com, toshi.kani@....com, ming.lei@...onical.com,
        sathya.prakash@...adcom.com, chaitra.basappa@...adcom.com,
        suganath-prabu.subramani@...adcom.com, linux-block@...r.kernel.org,
        linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
        MPT-FusionLinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
        Adam Manzananares <adam.manzanares@....com>
Subject: Re: [PATCH v6 1/3] block: Add iocontext priority to request

On 10/19/2016 12:05 PM, Tejun Heo wrote:
> Hello,
>
> On Mon, Oct 17, 2016 at 11:27:28AM -0700, Adam Manzanares wrote:
>> Patch adds an association between iocontext ioprio and the ioprio of a
>> request. This is done to enable request based drivers the ability to
>> act on priority information stored in the request. An example being
>> ATA devices that support command priorities. If the ATA driver discovers
>> that the device supports command priorities and the request has valid
>> priority information indicating the request is high priority, then a high
>> priority command can be sent to the device. This should improve tail
>> latencies for high priority IO on any device that queues requests
>> internally and can make use of the priority information stored in the
>> request.
>>
>> The ioprio of the request is set in blk_rq_set_prio which takes the
>> request and the ioc as arguments. If the ioc is valid in blk_rq_set_prio
>> then the iopriority of the request is set as the iopriority of the ioc.
>> In init_request_from_bio a check is made to see if the ioprio of the bio
>> is valid and if so then the request prio comes from the bio.
>>
>> Signed-off-by: Adam Manzananares <adam.manzanares@....com>
>
> Jens, if you're okay with it, I can route this through
> libata/for-4.10, or this can be applied to block and libata tree can
> pull from it.

I'm fine with that, add my Reviewed-by and funnel it through the libata
tree.

-- 
Jens Axboe