linux-kernel - Re: [PATCH -next] cgroup: increase maximum subsystem count from 16 to 32

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Message-ID: <d1a0f008-1834-4e9d-8c6e-6ae7cffa4c08@gmail.com>
Date: Thu, 29 Jan 2026 17:24:58 -0800
From: JP Kobryn <inwardvessel@...il.com>
To: Chen Ridong <chenridong@...weicloud.com>, tj@...nel.org,
 hannes@...xchg.org, mkoutny@...e.com, rostedt@...dmis.org,
 mhiramat@...nel.org, mathieu.desnoyers@...icios.com, shakeel.butt@...ux.dev
Cc: cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, lujialin4@...wei.com
Subject: Re: [PATCH -next] cgroup: increase maximum subsystem count from 16 to
 32

Hi Chen,

On 1/28/26 10:31 PM, Chen Ridong wrote:
> From: Chen Ridong <chenridong@...wei.com>
> 
> The current cgroup subsystem limit of 16 is insufficient, as the number of
> subsystems has already reached this maximum. Attempting to add new
> subsystems beyond this limit results in boot failures.
> 
> This patch increases the maximum number of supported cgroup subsystems from
> 16 to 32, providing adequate headroom for future subsystem additions.
> 
> Signed-off-by: Chen Ridong <chenridong@...wei.com>
> ---
[...]

I gave this a run with with 32 controllers enabled (16 pre-existing, 16
custom) and can confirm it works as expected.

Tested-by: JP Kobryn <inwardvessel@...il.com>
Acked-by: JP Kobryn <inwardvessel@...il.com>