From: Sagi Grimberg <sagi@grimberg.me>
To: Christoph Hellwig <hch@lst.de>
Cc: linux-nvme@lists.infradead.org, Keith Busch <kbusch@kernel.org>,
Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, Ming Lin <mlin@kernel.org>,
Chao Leng <lengchao@huawei.com>,
"Paul E. McKenney" <paulmck@kernel.org>
Subject: Re: [PATCH v5 1/2] blk-mq: add tagset quiesce interface
Date: Tue, 28 Jul 2020 00:48:39 -0700 [thread overview]
Message-ID: <54c7f095-c112-eaa7-3c69-65b4b48f2688@grimberg.me> (raw)
In-Reply-To: <20200728071859.GA21629@lst.de>
> I like the tagset based interface.
Even that we need to unquiesce back the connect_q?
See my comment on v5. Kinda bothers me...
But the idea of doing a per-hctx
> allocation and wait doesn't seem very scalable.
I belong to this camp too..
> Paul, do you have any good idea for an interface that waits on
> multiple srcu heads? As far as I can tell we could just have a single
> global completion and counter, and each call_srcu would just just
> decrement it and then the final one would do the wakeup. It would just
> be great to figure out a way to keep the struct rcu_synchronize and
> counter on stack to avoid an allocation.
>
> But if we can't do with an on-stack object I'd much rather just embedd
> the rcu_head in the hw_ctx.
next prev parent reply other threads:[~2020-07-28 7:48 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-27 23:10 [PATCH v5 0/2] improve nvme quiesce time for large amount of namespaces Sagi Grimberg
2020-07-27 23:10 ` [PATCH v5 1/2] blk-mq: add tagset quiesce interface Sagi Grimberg
2020-07-27 23:32 ` Keith Busch
2020-07-28 0:12 ` Sagi Grimberg
2020-07-28 1:40 ` Ming Lei
2020-07-28 1:51 ` Jens Axboe
2020-07-28 2:17 ` Ming Lei
2020-07-28 2:23 ` Jens Axboe
2020-07-28 2:28 ` Ming Lei
2020-07-28 2:32 ` Jens Axboe
2020-07-28 3:29 ` Sagi Grimberg
2020-07-28 3:25 ` Sagi Grimberg
2020-07-28 7:18 ` Christoph Hellwig
2020-07-28 7:48 ` Sagi Grimberg [this message]
2020-07-28 9:16 ` Ming Lei
2020-07-28 9:24 ` Sagi Grimberg
2020-07-28 9:33 ` Ming Lei
2020-07-28 9:37 ` Sagi Grimberg
2020-07-28 9:43 ` Sagi Grimberg
2020-07-28 10:10 ` Ming Lei
2020-07-28 10:57 ` Christoph Hellwig
2020-07-28 14:13 ` Paul E. McKenney
2020-07-28 10:58 ` Christoph Hellwig
2020-07-28 16:25 ` Sagi Grimberg
2020-07-28 13:54 ` Paul E. McKenney
2020-07-28 23:46 ` Sagi Grimberg
2020-07-29 0:31 ` Paul E. McKenney
2020-07-29 0:43 ` Sagi Grimberg
2020-07-29 0:59 ` Keith Busch
2020-07-29 4:39 ` Sagi Grimberg
2020-08-07 9:04 ` Chao Leng
2020-08-07 9:24 ` Ming Lei
2020-08-07 9:35 ` Chao Leng
2020-07-29 4:10 ` Paul E. McKenney
2020-07-29 4:37 ` Sagi Grimberg
2020-07-27 23:10 ` [PATCH v5 2/2] nvme: use blk_mq_[un]quiesce_tagset Sagi Grimberg
2020-07-28 0:54 ` Sagi Grimberg
2020-07-28 3:21 ` Chao Leng
2020-07-28 3:34 ` Sagi Grimberg
2020-07-28 3:51 ` Chao Leng
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