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From: Qiliang Yuan <odys.yuan@gmail.com>
To: Ming Lei <ming.lei@redhat.com>, Jens Axboe <axboe@kernel.dk>,
	Nilay Shroff <nilay@linux.ibm.com>,
	Hannes Reinecke <hare@suse.de>
Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
	stable@vger.kernel.org
Subject: Re: [PATCH] block: don't quiesce the queue when setting the default elevator
Date: Sat, 10 Oct 2026 10:36:07 +0800	[thread overview]
Message-ID: <20261010023608.3667184-1-odys.yuan@gmail.com> (raw)
In-Reply-To: <20261001-bug-block-elevator-init-quiesce-v1-1-5c85fa0ec59b@gmail.com>

Hi Ming, Jens,

Gentle ping. Since 1e44bedbc921 ("block: unifying elevator change"),
setting the default elevator quiesces the queue again, which
245a489e81e1 had avoided, so every disk added with a default elevator
waits for an RCU grace period. START_DEV of a single-queue ublk device
takes 7.74ms at p50 instead of 0.68ms.

Ming, as the author of 1e44bedbc921, could you take a look when you
have a moment?

Thanks,
Qiliang

  reply	other threads:[~2026-10-10  2:36 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-01  3:10 Qiliang Yuan
2026-10-10  2:36 ` Qiliang Yuan [this message]
2026-10-10  3:17   ` Qiliang Yuan
2026-10-10  4:18 ` Ming Lei

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