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

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To: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH v8 05/17] mm: Assign memcg-aware shrinkers bitmap to memcg
From: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Date: Thu, 5 Jul 2018 15:50:04 -0700
Cc: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>, vdavydov.dev@xxxxxxxxx, shakeelb@xxxxxxxxxx, viro@xxxxxxxxxxxxxxxxxx, hannes@xxxxxxxxxxx, mhocko@xxxxxxxxxx, tglx@xxxxxxxxxxxxx, pombredanne@xxxxxxxx, stummala@xxxxxxxxxxxxxx, gregkh@xxxxxxxxxxxxxxxxxxx, sfr@xxxxxxxxxxxxxxxx, guro@xxxxxx, mka@xxxxxxxxxxxx, penguin-kernel@xxxxxxxxxxxxxxxxxxx, chris@xxxxxxxxxxxxxxxxxx, longman@xxxxxxxxxx, minchan@xxxxxxxxxx, ying.huang@xxxxxxxxx, mgorman@xxxxxxxxxxxxxxxxxxx, jbacik@xxxxxx, linux@xxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, lirongqing@xxxxxxxxx, aryabinin@xxxxxxxxxxxxx
In-reply-to: <20180703135000.b2322ae0e514f028e7941d3c@linux-foundation.org>
References: <153063036670.1818.16010062622751502.stgit@localhost.localdomain> <153063056619.1818.12550500883688681076.stgit@localhost.localdomain> <20180703135000.b2322ae0e514f028e7941d3c@linux-foundation.org>
User-agent: Mutt/1.9.2 (2017-12-15)

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.

References:
- [PATCH v8 00/17] Improve shrink_slab() scalability (old complexity was O(n^2), new is O(n))
  - From: Kirill Tkhai
- [PATCH v8 05/17] mm: Assign memcg-aware shrinkers bitmap to memcg
  - From: Kirill Tkhai
- Re: [PATCH v8 05/17] mm: Assign memcg-aware shrinkers bitmap to memcg
  - From: Andrew Morton

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