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.
