linux-kernel - Re: [PATCH] cgroup, docs: Clarify limitation of RT processes with cgroup v2 cpu controller

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Message-ID: <ZgHaUyeIcS0w_udY@slm.duckdns.org>
Date: Mon, 25 Mar 2024 10:10:59 -1000
From: Tejun Heo <tj@...nel.org>
To: Waiman Long <longman@...hat.com>
Cc: Zefan Li <lizefan.x@...edance.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Jonathan Corbet <corbet@....net>, cgroups@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Brent Rowsell <browsell@...hat.com>,
	Mrunal Patel <mpatel@...hat.com>, Peter Hunt <pehunt@...hat.com>
Subject: Re: [PATCH] cgroup, docs: Clarify limitation of RT processes with
 cgroup v2 cpu controller

On Wed, Mar 20, 2024 at 10:23:02AM -0400, Waiman Long wrote:
> The limitation that all RT processes have to be in the root cgroup
> before enabling cpu controller only applies if the CONFIG_RT_GROUP_SCHED
> option is enabled in the running kernel. If a kernel does not have
> CONFIG_RT_GROUP_SCHED enabled, RT processes can exist in a non-root
> cgroup even when cpu controller is enabled. CPU sharing of RT processes
> will not be under cgroup control, but other resources like memory can be.
> 
> Clarify this limitation to avoid confusion to users that are using
> cgroup v2.
> 
> Signed-off-by: Waiman Long <longman@...hat.com>

Applied to cgroup/for-6.10.

Thanks.

-- 
tejun