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

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Message-ID: <20161019180524.GH18532@htj.duckdns.org>
Date:   Wed, 19 Oct 2016 14:05:24 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Adam Manzanares <adam.manzanares@...t.com>
Cc:     axboe@...nel.dk, 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

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.

Thanks.

-- 
tejun