Re: [PATCH 6/8] mm: memcontrol: move kmem accounting code to CONFIG_MEMCG

From: Michal Hocko
Date: Thu Dec 10 2015 - 08:17:28 EST

On Tue 08-12-15 13:34:23, Johannes Weiner wrote:
> The cgroup2 memory controller will account important in-kernel memory
> consumers per default. Move all necessary components to CONFIG_MEMCG.

Hmm, that bloats the kernel also for users who are not using cgroup2
and have CONFIG_MEMCG_KMEM disabled.

This is the situation before this patch
text data bss dec hex filename
521342 97516 44312 663170 a1e82 mm/built-in.o.kmem
513349 96299 43960 653608 9f928 mm/built-in.o.nokmem

and after with CONFIG_MEMCG_KMEM=n

521028 96556 44312 661896 a1988 mm/built-in.o

we are basically back to CONFIG_MEMCG_KMEM=y. This sounds like a wastage
to me. Do we really need this?

> Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Michal Hocko
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