On Fri, Nov 26, 2021 at 03:47:24PM +0100, Michal Koutný wrote:

The question here is how long would stay the offlined blkcgs around if
they were directly pinned upon the IO submission. If it's unbound, then
reparenting makes more sense.

It should be fine to pin whatever's necessary while related IOs are in
flight and percpu_ref used for css refcnting isn't gonna make any noticeable
difference in terms of overhead.

Thanks.

-- 
tejun