Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1504212

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

Show all headers | View raw

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@wdc.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

Back to linux.kernel | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

Re: [PATCH v6 1/3] block: Add iocontext priority to request Tejun Heo <tj@kernel.org> - 2016-10-19 20:10 +0200
  Re: [PATCH v6 1/3] block: Add iocontext priority to request Jens Axboe <axboe@kernel.dk> - 2016-10-19 20:10 +0200

csiph-web