From: Ming Lei <ming.lei@redhat.com>
To: Oleksandr Natalenko <oleksandr@natalenko.name>
Cc: Jens Axboe <axboe@fb.com>,
linux-block@vger.kernel.org,
Christoph Hellwig <hch@infradead.org>,
Bart Van Assche <bart.vanassche@sandisk.com>,
Laurence Oberman <loberman@redhat.com>,
Paolo Valente <paolo.valente@linaro.org>,
Tom Nguyen <tom81094@gmail.com>,
linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
Omar Sandoval <osandov@fb.com>,
John Garry <john.garry@huawei.com>
Subject: Re: [PATCH V10 0/8] blk-mq-sched: improve sequential I/O performance
Date: Sun, 15 Oct 2017 07:16:28 +0800 [thread overview]
Message-ID: <20171014231627.GA17485@ming.t460p> (raw)
In-Reply-To: <7774487.lQXyKRvAUb@natalenko.name>
On Sat, Oct 14, 2017 at 07:38:29PM +0200, Oleksandr Natalenko wrote:
> Hi.
>
> By any chance, could this be backported to 4.14? I'm confused with "SCSI:
> allow to pass null rq to scsi_prep_state_check()" since it uses refactored
> flags.
>
> ===
> if (req && !(req->rq_flags & RQF_PREEMPT))
> ===
>
> Is it safe to revert to REQ_PREEMPT here, or rq_flags should also be replaced
> with cmd_flags?
Hi Oleksandr,
Inside scsi_mq_get_budget(), req is passed as null, and RQF_PREEMPT
won't be checked at all.
Thanks,
Ming
prev parent reply other threads:[~2017-10-14 23:16 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-14 9:22 [PATCH V10 0/8] blk-mq-sched: improve sequential I/O performance Ming Lei
2017-10-14 9:22 ` [PATCH V10 1/8] blk-mq-sched: dispatch from scheduler only after progress is made on ->dispatch Ming Lei
2017-10-14 9:22 ` [PATCH V10 2/8] blk-mq-sched: move actual dispatching into one helper Ming Lei
2017-10-14 9:22 ` [PATCH V10 3/8] sbitmap: introduce __sbitmap_for_each_set() Ming Lei
2017-10-14 9:22 ` [PATCH V10 4/8] block: kyber: check if there is request in ctx in kyber_has_work() Ming Lei
2017-10-14 9:22 ` [PATCH V10 5/8] blk-mq: introduce .get_budget and .put_budget in blk_mq_ops Ming Lei
2017-10-14 9:22 ` [PATCH V10 6/8] blk-mq-sched: improve dispatching from sw queue Ming Lei
2017-10-14 9:22 ` [PATCH V10 7/8] SCSI: allow to pass null rq to scsi_prep_state_check() Ming Lei
2017-10-14 9:22 ` [PATCH V10 8/8] SCSI: implement .get_budget and .put_budget for blk-mq Ming Lei
2017-10-14 15:39 ` [PATCH V10 0/8] blk-mq-sched: improve sequential I/O performance Jens Axboe
2017-10-14 23:17 ` Ming Lei
2017-10-14 17:38 ` Oleksandr Natalenko
2017-10-14 23:16 ` Ming Lei [this message]
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