linux-kernel - Re: [PATCH V7 5/6] blk-mq-sched: improve dispatching from sw queue

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Date:   Fri, 13 Oct 2017 08:20:37 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Bart Van Assche <bart.vanassche@....com>
Cc:     Jens Axboe <axboe@...com>, linux-block@...r.kernel.org,
        Christoph Hellwig <hch@...radead.org>,
        Bart Van Assche <bart.vanassche@...disk.com>,
        Laurence Oberman <loberman@...hat.com>,
        Paolo Valente <paolo.valente@...aro.org>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        Tom Nguyen <tom81094@...il.com>, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org, Omar Sandoval <osandov@...com>,
        John Garry <john.garry@...wei.com>
Subject: Re: [PATCH V7 5/6] blk-mq-sched: improve dispatching from sw queue

On Thu, Oct 12, 2017 at 11:48:22AM -0700, Bart Van Assche wrote:
> On 10/12/17 11:37, Ming Lei wrote:
> > [ ... ]
> > 
> > This patch improves dispatching from sw queue by using the callback of
> > .get_budget and .put_budget
> > 
> > Reviewed-by: Omar Sandoval <osandov@...com>
> > Reviewed-by: Bart Van Assche <bart.vanassche@....com>
> > Signed-off-by: Ming Lei <ming.lei@...hat.com>
> > ---
> > 
> > Jens/Omar, once .get_budget is introduced, it can be unusual to
> > return busy from .queue_rq, so we can't use the approach discussed
> > to decide to take one by one or flush all. Then this patch
> > simply checks if .get_budget is implemented, looks it is reasonable,
> > and in future it is even possible to take more requests by getting
> > enough budget first.
> > [ ... ]
> 
> Version 7 of this patch differs significantly from the version I reviewed so
> I think you should remove my Reviewed-by tag.

OK, no problem, the only difference is on the introduced .get_budget().

-- 
Ming