linux-kernel - Re: [PATCH v2 1/1] blk-mq: Inline request status checkers

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Message-ID: <6da099e2-7e29-3c7b-7682-df86835e9e8c@gmail.com>
Date:   Mon, 30 Sep 2019 23:12:31 +0300
From:   Pavel Begunkov <asml.silence@...il.com>
To:     Bart Van Assche <bvanassche@....org>, Jens Axboe <axboe@...nel.dk>,
        Josef Bacik <josef@...icpanda.com>,
        Keith Busch <kbusch@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, nbd@...er.debian.org,
        linux-nvme@...ts.infradead.org
Subject: Re: [PATCH v2 1/1] blk-mq: Inline request status checkers

On 30/09/2019 22:53, Bart Van Assche wrote:
> On 9/30/19 12:43 PM, Pavel Begunkov (Silence) wrote:
>> @@ -282,7 +282,7 @@ static bool bt_tags_iter(struct sbitmap *bitmap, unsigned int bitnr, void *data)
>>  	 * test and set the bit before assining ->rqs[].
>>  	 */
>>  	rq = tags->rqs[bitnr];
>> -	if (rq && blk_mq_request_started(rq))
>> +	if (rq && blk_mq_rq_state(rq) != MQ_RQ_IDLE)
>>  		return iter_data->fn(rq, iter_data->data, reserved);
>>  
>>  	return true>
>> @@ -360,7 +360,7 @@ static bool blk_mq_tagset_count_completed_rqs(struct request *rq,
>>  {
>>  	unsigned *count = data;
>>  
>> -	if (blk_mq_request_completed(rq))
>> +	if (blk_mq_rq_state(rq) == MQ_RQ_COMPLETE)
>>  		(*count)++;
>>  	return true;
>>  }
> 
> Changes like the above significantly reduce readability of the code in
> the block layer core. I don't like this. I think this patch is a step
> backwards instead of a step forwards.

Yep, looks too bulky.

Jens, could you consider the first version?


-- 
Yours sincerely,
Pavel Begunkov



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