On Sun, Apr 08, 2018 at 05:48:08PM +0800, Ming Lei wrote:
> >From commit 4b855ad37194 ("blk-mq: Create hctx for each present CPU),
> blk-mq doesn't remap queue after CPU topo is changed, that said when
> some of these offline CPUs become online, they are still mapped to
> hctx 0, then hctx 0 may become the bottleneck of IO dispatch and
> completion.
>
> This patch sets up the mapping from the beginning, and aligns to
> queue mapping for PCI device (blk_mq_pci_map_queues()).
Please kill the now pointless cpu_to_queue_index function.
Otherwise looks good:
Reviewed-by: Christoph Hellwig <hch@xxxxxx>