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From: Ming Lei <ming.lei@redhat.com>
To: Yu Kuai <yukuai1@huaweicloud.com>
Cc: axboe@kernel.dk, hare@suse.de, nilay@linux.ibm.com,
	linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
	yukuai3@huawei.com, yi.zhang@huawei.com, yangerkun@huawei.com,
	johnny.chenyi@huawei.com
Subject: Re: [PATCH 04/10] blk-mq: serialize updating nr_requests with update_nr_hwq_lock
Date: Fri, 15 Aug 2025 22:47:47 +0800	[thread overview]
Message-ID: <aJ9IkylydqSNZqwC@fedora> (raw)
In-Reply-To: <20250815080216.410665-5-yukuai1@huaweicloud.com>

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


  reply	other threads:[~2025-08-15 14:48 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-08-15  8:02 [PATCH 00/10] blk-mq: fix blk_mq_tags double free while nr_requests grown Yu Kuai
2025-08-15  8:02 ` [PATCH 01/10] blk-mq: remove useless checking from queue_requests_store() Yu Kuai
2025-08-15  8:02 ` [PATCH 02/10] blk-mq: remove useless checkings from blk_mq_update_nr_requests() Yu Kuai
2025-08-15  8:02 ` [PATCH 03/10] blk-mq: check invalid nr_requests in queue_requests_store() Yu Kuai
2025-08-15  8:02 ` [PATCH 04/10] blk-mq: serialize updating nr_requests with update_nr_hwq_lock Yu Kuai
2025-08-15 14:47   ` Ming Lei [this message]
2025-08-16  0:49     ` Yu Kuai
2025-08-16  2:23       ` Ming Lei
2025-08-15  8:02 ` [PATCH 05/10] blk-mq: cleanup shared tags case in blk_mq_update_nr_requests() Yu Kuai
2025-08-15  8:02 ` [PATCH 06/10] blk-mq: split bitmap grow and resize " Yu Kuai
2025-08-15  8:02 ` [PATCH 07/10] blk-mq-sched: add new parameter nr_requests in blk_mq_alloc_sched_tags() Yu Kuai
2025-08-15  8:02 ` [PATCH 08/10] blk-mq: fix blk_mq_tags double free while nr_requests grown Yu Kuai
2025-08-15 19:30   ` Nilay Shroff
2025-08-16  2:57     ` Yu Kuai
2025-08-16  4:05       ` Ming Lei
2025-08-16  8:05         ` 余快
2025-08-18  2:11           ` Ming Lei
2025-08-18  3:12             ` Ming Lei
2025-08-15  8:02 ` [PATCH 09/10] blk-mq: remove blk_mq_tag_update_depth() Yu Kuai
2025-08-15  8:02 ` [PATCH 10/10] blk-mq: fix stale nr_requests documentation Yu Kuai
2025-08-15  8:30 ` [PATCH 00/10] blk-mq: fix blk_mq_tags double free while nr_requests grown Ming Lei
2025-08-15  9:05   ` Yu Kuai
2025-08-15 14:20     ` Ming Lei

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