linux-kernel - Re: [PATCH 04/10] blk-mq: serialize updating nr_requests with update_nr_hwq

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Message-ID: <aJ9IkylydqSNZqwC@fedora>
Date: Fri, 15 Aug 2025 22:47:47 +0800
From: Ming Lei <ming.lei@...hat.com>
To: Yu Kuai <yukuai1@...weicloud.com>
Cc: axboe@...nel.dk, hare@...e.de, nilay@...ux.ibm.com,
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	yukuai3@...wei.com, yi.zhang@...wei.com, yangerkun@...wei.com,
	johnny.chenyi@...wei.com
Subject: Re: [PATCH 04/10] blk-mq: serialize updating nr_requests with
 update_nr_hwq_lock

On Fri, Aug 15, 2025 at 04:02:10PM +0800, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@...wei.com>
> 
> request_queue->nr_requests can be changed by:
> 
> a) switching elevator by update nr_hw_queues
> b) switching elevator by elevator sysfs attribute
> c) configue queue sysfs attribute nr_requests

 ->elevator_lock is grabbed for updating ->nr_requests except for queue
initialization, so what is the real problem you are trying to solve?


Thanks,
Ming