linux-kernel - Re: [PATCH v4 9/9] blk-mq: issue warning when offlining hctx with online isolcpus

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Message-ID: <Z2UzE-CGa7YVwx0f@fedora>
Date: Fri, 20 Dec 2024 17:04:19 +0800
From: Ming Lei <ming.lei@...hat.com>
To: Daniel Wagner <wagi@...nel.org>
Cc: Jens Axboe <axboe@...nel.dk>, Keith Busch <kbusch@...nel.org>,
	Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
	Kashyap Desai <kashyap.desai@...adcom.com>,
	Sumit Saxena <sumit.saxena@...adcom.com>,
	Shivasharan S <shivasharan.srikanteshwara@...adcom.com>,
	Chandrakanth patil <chandrakanth.patil@...adcom.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Nilesh Javali <njavali@...vell.com>,
	GR-QLogic-Storage-Upstream@...vell.com,
	Don Brace <don.brace@...rochip.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
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	Eugenio Pérez <eperezma@...hat.com>,
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	Andrew Morton <akpm@...ux-foundation.org>,
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	Frederic Weisbecker <frederic@...nel.org>,
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Subject: Re: [PATCH v4 9/9] blk-mq: issue warning when offlining hctx with
 online isolcpus

On Tue, Dec 17, 2024 at 07:29:43PM +0100, Daniel Wagner wrote:
> When we offlining a hardware context which also serves isolcpus mapped
> to it, any IO issued by the isolcpus will stall as there is nothing
> which handles the interrupts etc.
> 
> This configuration/setup is not supported at this point thus just issue
> a warning.

As I mentioned on patch 8, this io hang is regression on existed
applications which can work just fine with 'isolcpus=managed_irq'.

Do you think the added warning will prevent people from complaining
the regression? :-)


Thanks,
Ming