On 6/5/20 5:44 AM, Ming Lei wrote:
> Hi Jens,
>
> The 1st patch avoids to fail driver tag allocation because of inactive
> hctx, so hang risk can be killed during cpu hotplug.
>
> The 2nd patch fixes blk_mq_all_tag_iter so that we can drain all
> requests before one hctx becomes inactive.
>
> Both fixes bf0beec0607d ("blk-mq: drain I/O when all CPUs in a hctx are
> offline").
>
> John has verified that the two can fix his request timeout issue during
> cpu hotplug.
Thanks, applied.
--
Jens Axboe
