From: Bart Van Assche <bvanassche@acm.org>
To: Mohamed Khalfella <mkhalfella@purestorage.com>
Cc: Chaitanya Kulkarni <kch@nvidia.com>,
Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
Keith Busch <kbusch@kernel.org>, Sagi Grimberg <sagi@grimberg.me>,
Casey Chen <cachen@purestorage.com>,
Yuanyuan Zhong <yzhong@purestorage.com>,
Hannes Reinecke <hare@suse.de>, Ming Lei <ming.lei@redhat.com>,
Waiman Long <llong@redhat.com>, Hillf Danton <hdanton@sina.com>,
linux-nvme@lists.infradead.org, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/1] block: Use RCU in blk_mq_[un]quiesce_tagset() instead of set->tag_list_lock
Date: Thu, 4 Dec 2025 09:06:47 -1000 [thread overview]
Message-ID: <71e9950f-ace7-4570-a604-ceca347eea20@acm.org> (raw)
In-Reply-To: <20251204184243.GZ337106-mkhalfella@purestorage.com>
On 12/4/25 8:42 AM, Mohamed Khalfella wrote:
> Is blk_mq_del_queue_tag_set() performance sensitive such that it can not
> take synchronize_rcu()? It is not in IO codepath, right?
Introducing a new synchronize_rcu() call almost always slows down some
workload so it should be avoided if possible.
> I can not think of an easy way to do that. Suggestions are welcomed.
I can't find the implementation of nvme_dev_disable_locked(). What
kernel tree does your patch apply to?
$ git grep -w nvme_dev_disable_locked axboe-block/for-next | wc -l
0
Thanks,
Bart.
next prev parent reply other threads:[~2025-12-04 19:07 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-04 18:11 [PATCH 0/1] Use RCU in blk_mq_[un]quiesce_tagset() instead of set->tag_list_lock Mohamed Khalfella
2025-12-04 18:11 ` [PATCH 1/1] block: " Mohamed Khalfella
2025-12-04 18:22 ` Bart Van Assche
2025-12-04 18:42 ` Mohamed Khalfella
2025-12-04 19:06 ` Bart Van Assche [this message]
2025-12-04 19:15 ` Mohamed Khalfella
2025-12-04 19:31 ` Bart Van Assche
2025-12-04 19:57 ` Mohamed Khalfella
2025-12-04 20:24 ` Bart Van Assche
2025-12-04 21:26 ` Keith Busch
2025-12-04 23:22 ` Bart Van Assche
2025-12-05 1:32 ` Keith Busch
2025-12-05 2:52 ` Bart Van Assche
2025-12-05 16:39 ` Mohamed Khalfella
2025-12-05 18:11 ` Keith Busch
2025-12-08 19:22 ` Bart Van Assche
2025-12-04 19:02 ` Mohamed Khalfella
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