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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 23:06:51 +0800	[thread overview]
Message-ID: <YWWki6An1sOpx3rV@T590> (raw)
In-Reply-To: <20211012103010.GA29640@lst.de>

On Tue, Oct 12, 2021 at 12:30:10PM +0200, Christoph Hellwig wrote:
> On Sat, Oct 09, 2021 at 11:47:13AM +0800, Ming Lei wrote:
> > +	spin_lock_irqsave(&q->queue_lock, flags);
> > +	if (!q->quiesce_depth++)
> > +		blk_queue_flag_set(QUEUE_FLAG_QUIESCED, q);
> 
> 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.

> 
> > +	spin_lock_irqsave(&q->queue_lock, flags);
> > +	WARN_ON_ONCE(q->quiesce_depth <= 0);
> > +	if (q->quiesce_depth > 0 && !--q->quiesce_depth) {
> 
> 	if (WARN_ON_ONCE(q->quiesce_depth <= 0))
> 		; /* oops */
> 	else if (!--q->quiesce_depth)
> 		run_queue = true;

OK.


Thanks,
Ming


WARNING: multiple messages have this Message-ID (diff)
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 23:06:51 +0800	[thread overview]
Message-ID: <YWWki6An1sOpx3rV@T590> (raw)
In-Reply-To: <20211012103010.GA29640@lst.de>

On Tue, Oct 12, 2021 at 12:30:10PM +0200, Christoph Hellwig wrote:
> On Sat, Oct 09, 2021 at 11:47:13AM +0800, Ming Lei wrote:
> > +	spin_lock_irqsave(&q->queue_lock, flags);
> > +	if (!q->quiesce_depth++)
> > +		blk_queue_flag_set(QUEUE_FLAG_QUIESCED, q);
> 
> 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.

> 
> > +	spin_lock_irqsave(&q->queue_lock, flags);
> > +	WARN_ON_ONCE(q->quiesce_depth <= 0);
> > +	if (q->quiesce_depth > 0 && !--q->quiesce_depth) {
> 
> 	if (WARN_ON_ONCE(q->quiesce_depth <= 0))
> 		; /* oops */
> 	else if (!--q->quiesce_depth)
> 		run_queue = true;

OK.


Thanks,
Ming


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  reply	other threads:[~2021-10-12 15:07 UTC|newest]

Thread overview: 32+ 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 ` 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   ` 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   ` 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   ` Ming Lei
2021-10-09  3:47 ` [PATCH V3 4/6] nvme: paring quiesce/unquiesce Ming Lei
2021-10-09  3:47   ` Ming Lei
2021-10-12 10:36   ` Christoph Hellwig
2021-10-12 10:36     ` Christoph Hellwig
2021-10-12 15:01     ` Ming Lei
2021-10-12 15:01       ` Ming Lei
2021-10-12 15:07       ` Christoph Hellwig
2021-10-12 15:07         ` Christoph Hellwig
2021-10-12 15:17         ` Ming Lei
2021-10-12 15:17           ` Ming Lei
2021-10-13 12:23           ` Sagi Grimberg
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   ` Ming Lei
2021-10-09  3:47 ` [PATCH V3 6/6] blk-mq: support concurrent queue quiesce/unquiesce Ming Lei
2021-10-09  3:47   ` Ming Lei
2021-10-12 10:30   ` Christoph Hellwig
2021-10-12 10:30     ` Christoph Hellwig
2021-10-12 15:06     ` Ming Lei [this message]
2021-10-12 15:06       ` Ming Lei
2021-10-12 15:08       ` Christoph Hellwig
2021-10-12 15:08         ` Christoph Hellwig
2021-10-12 15:13         ` Ming Lei
2021-10-12 15:13           ` Ming Lei

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