Re: [PATCH 04/10] blk-mq: serialize updating nr_requests with update_nr_hwq_lock

[Ming Lei]

On Fri, Aug 15, 2025 at 04:02:10PM +0800, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@xxxxxxxxxx>
> 
> 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