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Date:   Thu, 5 Jul 2018 15:50:04 -0700
From:   Matthew Wilcox <willy@infradead.org>
To:     Andrew Morton <akpm@linux-foundation.org>
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Subject: Re: [PATCH v8 05/17] mm: Assign memcg-aware shrinkers bitmap to memcg
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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.