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@xxxxxxx> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
