[PATCH 0/3] improve nvme quiesce time for large amount of namespaces

[Christoph Hellwig]

On Sun, Jul 31, 2022 at 01:23:36PM +0300, Sagi Grimberg wrote:
> But maybe we can avoid that, and because we allocate
> the connect_q ourselves, and fully know that it should
> not be apart of the tagset quiesce, perhaps we can introduce
> a new interface like:
> --
> static inline int nvme_ctrl_init_connect_q(struct nvme_ctrl *ctrl)
> {
> 	ctrl->connect_q = blk_mq_init_queue_self_quiesce(ctrl->tagset);
> 	if (IS_ERR(ctrl->connect_q))
> 		return PTR_ERR(ctrl->connect_q);
> 	return 0;
> }
> --
>
> And then blk_mq_quiesce_tagset can simply look into a per request-queue
> self_quiesce flag and skip as needed.

I'd just make that a queue flag set after allocation to keep the
interface simple, but otherwise this seems like the right thing
to do.