Re: [PATCH] blk-mq: insert rq with DONTPREP to hctx dispatch list when requeue

Hi Jens Thanks for your kindly response. On 2/12/19 7:20 AM, Jens Axboe wrote: > On 2/11/19 4:15 PM, Jens Axboe wrote: >> On 2/11/19 8:59 AM, Jens Axboe wrote: >>> On 2/10/19 10:41 PM, Jianchao Wang wrote: When requeue, if RQF_DONTPREP, rq has contained some driver specific data, so ins

Re: [PATCH] blk-mq: insert rq with DONTPREP to hctx dispatch list when requeue

On 2/11/19 4:15 PM, Jens Axboe wrote: > On 2/11/19 8:59 AM, Jens Axboe wrote: >> On 2/10/19 10:41 PM, Jianchao Wang wrote: >>> When requeue, if RQF_DONTPREP, rq has contained some driver >>> specific data, so insert it to hctx dispatch list to avoid any >>> merge. Take scsi as example, here is the

Re: [PATCH] blk-mq: insert rq with DONTPREP to hctx dispatch list when requeue

On 2/11/19 8:59 AM, Jens Axboe wrote: > On 2/10/19 10:41 PM, Jianchao Wang wrote: >> When requeue, if RQF_DONTPREP, rq has contained some driver >> specific data, so insert it to hctx dispatch list to avoid any >> merge. Take scsi as example, here is the trace event log (no >> io scheduler, because

Re: [PATCH] blk-mq: insert rq with DONTPREP to hctx dispatch list when requeue

On 2/10/19 10:41 PM, Jianchao Wang wrote: > When requeue, if RQF_DONTPREP, rq has contained some driver > specific data, so insert it to hctx dispatch list to avoid any > merge. Take scsi as example, here is the trace event log (no > io scheduler, because RQF_STARTED would prevent merging), > >