Re: [PATCH v3 2/3] blk-mq: ktime_get_ns() only once for batched requests init

To: chengming.zhou@xxxxxxxxx
Subject: Re: [PATCH v3 2/3] blk-mq: ktime_get_ns() only once for batched requests init
From: Christoph Hellwig <hch@xxxxxx>
Date: Thu, 29 Jun 2023 07:30:01 +0200
Cc: axboe@xxxxxxxxx, tj@xxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, zhouchengming@xxxxxxxxxxxxx, ming.lei@xxxxxxxxxx, hch@xxxxxx
In-reply-to: <20230628124546.1056698-3-chengming.zhou@linux.dev>
References: <20230628124546.1056698-1-chengming.zhou@linux.dev> <20230628124546.1056698-3-chengming.zhou@linux.dev>
User-agent: Mutt/1.5.17 (2007-11-01)

Can we just stash the start time into blk_mq_alloc_data instead of
passing down yet another parameter?

Follow-Ups:
- Re: [PATCH v3 2/3] blk-mq: ktime_get_ns() only once for batched requests init
  - From: Chengming Zhou

References:
- [PATCH v3 0/3] blk-mq: fix start_time_ns and alloc_time_ns for pre-allocated rq
  - From: chengming . zhou
- [PATCH v3 2/3] blk-mq: ktime_get_ns() only once for batched requests init
  - From: chengming . zhou