linux-kernel - Re: [PATCH v3 3/3] blk-mq: fix start_time_ns and alloc_time

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Date:   Thu, 29 Jun 2023 07:32:01 +0200
From:   Christoph Hellwig <hch@....de>
To:     chengming.zhou@...ux.dev
Cc:     axboe@...nel.dk, tj@...nel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, zhouchengming@...edance.com,
        ming.lei@...hat.com, hch@....de
Subject: Re: [PATCH v3 3/3] blk-mq: fix start_time_ns and alloc_time_ns for
 pre-allocated rq

> +/* Set rq alloc and start time when pre-allocated rq is actually used */
> +static inline void blk_mq_rq_time_init(struct request_queue *q, struct request *rq)
> +{
> +	if (blk_mq_need_time_stamp(rq->rq_flags)) {
> +		u64 now = ktime_get_ns();
> +
> +#ifdef CONFIG_BLK_RQ_ALLOC_TIME
> +		/*
> +		 * alloc time is only used by iocost for now,
> +		 * only possible when blk_mq_need_time_stamp().
> +		 */
> +		if (blk_queue_rq_alloc_time(q))
> +			rq->alloc_time_ns = now;
> +#endif
> +		rq->start_time_ns = now;
> +	}
> +}

No need to pass q separately here, you can just use rq->q.

While you're at it please capitalize the first letter of block comments.