From: axboe@kernel.dk (Jens Axboe)
Subject: [PATCH] blk-mq: Wait for for hctx requests on CPU unplug
Date: Fri, 5 Apr 2019 16:23:27 -0600 [thread overview]
Message-ID: <226503cd-53ac-902c-7944-b2748407b1d3@kernel.dk> (raw)
In-Reply-To: <20190405215920.27085-1-keith.busch@intel.com>
On 4/5/19 3:59 PM, Keith Busch wrote:
> Managed interrupts can not migrate affinity when their CPUs are offline.
> If the CPU is allowed to shutdown before they're returned, commands
> dispatched to managed queues won't be able to complete through their
> irq handlers.
>
> Introduce per-hctx reference counting so we can block the CPU dead
> notification for all allocated requests to complete if an hctx's last
> CPU is being taken offline.
What does this do to performance? We're doing a map per request...
--
Jens Axboe
next prev parent reply other threads:[~2019-04-05 22:23 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-05 21:59 [PATCH] blk-mq: Wait for for hctx requests on CPU unplug Keith Busch
2019-04-05 22:23 ` Jens Axboe [this message]
2019-04-05 22:37 ` Keith Busch
2019-04-05 23:04 ` Jens Axboe
2019-04-05 23:36 ` Keith Busch
2019-04-06 9:44 ` Dongli Zhang
2019-04-06 21:27 ` Ming Lei
2019-04-07 13:55 ` Dongli Zhang
2019-04-08 9:49 ` Ming Lei
2019-04-08 15:36 ` Keith Busch
2019-04-08 15:21 ` Keith Busch
2019-04-07 7:51 ` Christoph Hellwig
2019-04-08 15:23 ` Keith Busch
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