On Tue, Aug 04, 2026 at 11:30:55PM +0800, yu kuai wrote: > The problem here is that remove a cgroup can also remove the blkg from radix > tree, > even through it still has active refcounts. I think this can be fixed by > checking > the cgroup online_pin first, if it's zero, we can search the blkg from the > request_queue blkg list, where blkg will not be removed until > blkg_free_workfn(). > What's better, if we can convert the blkg list to hash table with key as > blk-cgroup, > it will be much better as we can lookup from this table instead of blkcg > radix tree.
Yes, I think you can really easily do that with the rhashtable.
