From: Ming Lei <ming.lei@redhat.com>
To: Christoph Hellwig <hch@lst.de>
Cc: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, linux-nvme@lists.infradead.org,
Chaitanya Kulkarni <chaitanyak@nvidia.com>,
Sagi Grimberg <sagi@grimberg.me>, Keith Busch <kbusch@kernel.org>,
Bart Van Assche <bvanassche@acm.org>
Subject: Re: [PATCH V3 6/6] blk-mq: support concurrent queue quiesce/unquiesce
Date: Tue, 12 Oct 2021 23:13:56 +0800 [thread overview]
Message-ID: <YWWmNMNKEUtBI1EH@T590> (raw)
In-Reply-To: <20211012150827.GB20571@lst.de>
On Tue, Oct 12, 2021 at 05:08:27PM +0200, Christoph Hellwig wrote:
> On Tue, Oct 12, 2021 at 11:06:51PM +0800, Ming Lei wrote:
> > > We can get rid of the QUEUE_FLAG_QUIESCED flag now and just look
> > > at ->quiesce_depth directly.
> >
> > I'd rather not to do that given we need to check QUEUE_FLAG_QUIESCED in fast
> > path.
>
> Checking an integer vs checking a bit is easier actually faster or at
> least the same speed depending on the architecture / micro architecture.
->queue_flag is always hot, but quiesce_depth can't be and shouldn't be
since it is used very less.
--
Ming
prev parent reply other threads:[~2021-10-12 15:14 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-09 3:47 [PATCH V3 0/6] blk-mq: support concurrent queue quiescing Ming Lei
2021-10-09 3:47 ` [PATCH V3 1/6] nvme: add APIs for stopping/starting admin queue Ming Lei
2021-10-09 3:47 ` [PATCH V3 2/6] nvme: apply nvme API to quiesce/unquiesce " Ming Lei
2021-10-09 3:47 ` [PATCH V3 3/6] nvme: prepare for pairing quiescing and unquiescing Ming Lei
2021-10-09 3:47 ` [PATCH V3 4/6] nvme: paring quiesce/unquiesce Ming Lei
2021-10-12 10:36 ` Christoph Hellwig
2021-10-12 15:01 ` Ming Lei
2021-10-12 15:07 ` Christoph Hellwig
2021-10-12 15:17 ` Ming Lei
2021-10-13 12:23 ` Sagi Grimberg
2021-10-09 3:47 ` [PATCH V3 5/6] nvme: loop: clear NVME_CTRL_ADMIN_Q_STOPPED after admin queue is reallocated Ming Lei
2021-10-09 3:47 ` [PATCH V3 6/6] blk-mq: support concurrent queue quiesce/unquiesce Ming Lei
2021-10-12 10:30 ` Christoph Hellwig
2021-10-12 15:06 ` Ming Lei
2021-10-12 15:08 ` Christoph Hellwig
2021-10-12 15:13 ` Ming Lei [this message]
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