Re: [PATCH 0/3] scsi: scsi-mq: don't hold host_busy in IO path

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On Fri, 2018-04-27 at 09:39 -0600, Jens Axboe wrote:
> blk_mq_tagset_busy_iter(&shost->tag_set, scsi_host_check_in_flight,
> 			&in_flight);
> return in_flight.cnt + atomic_read(&shost->host_busy);
> 
> The atomic read is basically free, once we get rid of the dirty of that
> variable on each IO.

Hello Jens,

What makes you think that " + atomic_read(&shost->host_busy)" is necessary?
I am not aware of any code outside the SCSI core that modifies the host_busy
member.

Thanks,

Bart.







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