linux-kernel - Re: [PATCH] memcg: manually uninline __memcg_memory

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Message-ID: <aPorFhxQc7K5iLZc@tiehlicka>
Date: Thu, 23 Oct 2025 15:18:14 +0200
From: Michal Hocko <mhocko@...e.com>
To: Shakeel Butt <shakeel.butt@...ux.dev>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>, linux-mm@...ck.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	Meta kernel team <kernel-team@...a.com>
Subject: Re: [PATCH] memcg: manually uninline __memcg_memory_event

On Tue 21-10-25 16:44:25, Shakeel Butt wrote:
> The function __memcg_memory_event has been unnecessarily marked inline
> even when it is not really performance critical. It is usually called
> to track extreme conditions. Over the time, it has evolved to include
> more functionality and inlining it is causing more harm.
> 
> Before the patch:
> $ size mm/memcontrol.o net/ipv4/tcp_input.o net/ipv4/tcp_output.o
>    text    data     bss     dec     hex filename
>   35645   10574    4192   50411    c4eb mm/memcontrol.o
>   54738    1658       0   56396    dc4c net/ipv4/tcp_input.o
>   34644    1065       0   35709    8b7d net/ipv4/tcp_output.o
> 
> After the patch:
> $ size mm/memcontrol.o net/ipv4/tcp_input.o net/ipv4/tcp_output.o
>    text    data     bss     dec     hex filename
>   35137   10446    4192   49775    c26f mm/memcontrol.o
>   54322    1562       0   55884    da4c net/ipv4/tcp_input.o
>   34492    1017       0   35509    8ab5 net/ipv4/tcp_output.o
> 
> Signed-off-by: Shakeel Butt <shakeel.butt@...ux.dev>

Acked-by: Michal Hocko <mhocko@...e.com>

As the only user is in tree should we make that EXPORT_SYMBOL_GPL
instead?

-- 
Michal Hocko
SUSE Labs