[PATCH 2/2] nvme: pass BLK_MQ_F_NOT_USE_MANAGED_IRQ for fc/rdma/tcp/loop

[Hannes Reinecke]

On 6/29/21 9:49 AM, Ming Lei wrote:
> All the 4 host drivers don't use managed irq for completing request, so
> it is correct to pass the flag to blk-mq.
> 
> Secondly with this flag, blk-mq will help us dispatch connect request
> allocated via blk_mq_alloc_request_hctx() to driver even though all
> CPU in the specified hctx's cpumask are offline.
> 
How is this supposed to work?
To my understanding, only cpus in the hctx cpumask are eligible to send 
I/O. So if all of these CPUs are offline, who exactly is submitting I/O?
More to the point, which CPU will be submitting the connect request?

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
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