linux-kernel - Re: [PATCHSET v4] blk-mq-scheduling framework

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Date:   Mon, 23 Jan 2017 18:04:31 +0100
From:   Paolo Valente <paolo.valente@...aro.org>
To:     Jens Axboe <axboe@...com>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        Linux-Kernal <linux-kernel@...r.kernel.org>,
        Omar Sandoval <osandov@...com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCHSET v4] blk-mq-scheduling framework


> Il giorno 18 gen 2017, alle ore 17:21, Jens Axboe <axboe@...com> ha scritto:
> 
> On 01/18/2017 08:14 AM, Paolo Valente wrote:
>> according to the function blk_mq_sched_put_request, the
>> mq.completed_request hook seems to always be invoked (if set) for a
>> request for which the mq.put_rq_priv is invoked (if set).
> 
> Correct, any request that came out of blk_mq_sched_get_request()
> will always have completed called on it, regardless of whether it
> had IO started on it or not.
> 

It seems that some request, after being dispatched, happens to have no
mq.put_rq_priv invoked on it now or then.  Is it expected?  If it is,
could you point me to the path through which the end of the life of
such a request is handled?

Thanks,
Paolo

> -- 
> Jens Axboe
>