From: keith.busch@intel.com (Keith Busch)
Subject: [PATCH 5/5] NVMe: IO queue deletion re-write
Date: Sun, 3 Jan 2016 16:26:25 +0000 [thread overview]
Message-ID: <20160103162625.GB31375@localhost.localdomain> (raw)
In-Reply-To: <20160103161704.GA5111@infradead.org>
On Sun, Jan 03, 2016@08:17:04AM -0800, Christoph Hellwig wrote:
> On Sun, Jan 03, 2016@03:43:31PM +0000, Keith Busch wrote:
> We'd get a reset for both cases, which isn't really what we what.
> I think we should be setting NVME_CTRL_RESETTING before doing a shutdown
> so that errors get reported in line.
We hold a mutex while resetting. The second reset will be stuck there.
> > You'll also need something to end
> > work waiting for a request when more queues exist than admin tags.
>
> It's called the block layer. blk_mq_alloc_request will block until
> the tag is available unless we explicitly request non-blocking behavior.
In the scenario I'm describing you _don't_ want it to succeed in getting
a request. You don't want it to wait indefinitely for one either.
next prev parent reply other threads:[~2016-01-03 16:26 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-30 17:27 [PATCH 0/5] NVMe fixes and updates for 4.5 Keith Busch
2015-12-30 17:27 ` [PATCH 1/5] NVMe: Fix admin queue ring wrap Keith Busch
2015-12-30 17:49 ` Christoph Hellwig
2015-12-30 17:56 ` Keith Busch
2015-12-30 17:53 ` Jens Axboe
2015-12-30 18:09 ` Christoph Hellwig
2015-12-30 17:27 ` [PATCH 2/5] NVMe: Use a retryable error code on reset Keith Busch
2015-12-30 17:52 ` Christoph Hellwig
2015-12-30 18:09 ` Keith Busch
2015-12-30 18:18 ` Christoph Hellwig
2015-12-30 17:27 ` [PATCH 3/5] NVMe: Remove queue freezing on resets Keith Busch
2015-12-30 17:53 ` Christoph Hellwig
2015-12-30 20:44 ` Sagi Grimberg
2015-12-30 20:42 ` Sagi Grimberg
2015-12-31 17:19 ` Sagi Grimberg
2015-12-30 17:27 ` [PATCH 4/5] NVMe: Shutdown controller only for power-off Keith Busch
2015-12-30 17:58 ` Christoph Hellwig
2015-12-30 18:02 ` Keith Busch
2015-12-30 18:14 ` Christoph Hellwig
2015-12-30 17:27 ` [PATCH 5/5] NVMe: IO queue deletion re-write Keith Busch
2015-12-30 18:04 ` Christoph Hellwig
2015-12-30 19:07 ` Keith Busch
2016-01-02 17:07 ` Christoph Hellwig
2016-01-02 21:30 ` Keith Busch
2016-01-03 11:40 ` Christoph Hellwig
2016-01-03 15:43 ` Keith Busch
2016-01-03 16:17 ` Christoph Hellwig
2016-01-03 16:26 ` Keith Busch [this message]
2016-01-03 18:04 ` Keith Busch
2016-01-03 17:05 ` Sagi Grimberg
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