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

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Date:   Thu, 5 Jul 2018 15:50:04 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Kirill Tkhai <ktkhai@...tuozzo.com>, vdavydov.dev@...il.com,
        shakeelb@...gle.com, viro@...iv.linux.org.uk, hannes@...xchg.org,
        mhocko@...nel.org, tglx@...utronix.de, pombredanne@...b.com,
        stummala@...eaurora.org, gregkh@...uxfoundation.org,
        sfr@...b.auug.org.au, guro@...com, mka@...omium.org,
        penguin-kernel@...ove.SAKURA.ne.jp, chris@...is-wilson.co.uk,
        longman@...hat.com, minchan@...nel.org, ying.huang@...el.com,
        mgorman@...hsingularity.net, jbacik@...com, linux@...ck-us.net,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        lirongqing@...du.com, aryabinin@...tuozzo.com
Subject: Re: [PATCH v8 05/17] mm: Assign memcg-aware shrinkers bitmap to memcg

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.