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

Ming Lei
2024-12-20T09:37:52Z

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