On 7/25/19 2:41 AM, Ming Lei wrote:

Spread queues among present CPUs first, then building mapping on other
non-present CPUs.

So we can minimize count of dead queues which are mapped by un-present
CPUs only. Then bad IO performance can be avoided by unbalanced mapping
between present CPUs and queues.

The similar policy has been applied on Managed IRQ affinity.

LGTM, queued up for some testing.

-- 
Jens Axboe