Re: [PATCH v8 05/17] mm: Assign memcg-aware shrinkers bitmap to memcg

[Matthew Wilcox]

On Tue, Jul 03, 2018 at 01:50:00PM -0700, Andrew Morton wrote:
>   It should be possible to find the highest ID in an IDR tree with a
>   straightforward descent of the underlying radix tree, but I doubt if
>   that has been wired up.  Otherwise a simple loop in
>   unregister_memcg_shrinker() would be needed.

Feature request received.  I've actually implemented it for the XArray
already, but it should be easy to do for the IDR too.