linux-kernel - Re: [RFC 1/8] cgroup: Add the DRM cgroup controller

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Date: Wed, 7 Feb 2024 16:28:24 +0100
From: Michal Koutný <mkoutny@...e.com>
To: Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
Cc: Intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, 
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>, 
	Johannes Weiner <hannes@...xchg.org>, Zefan Li <lizefan.x@...edance.com>, 
	Dave Airlie <airlied@...hat.com>, Daniel Vetter <daniel.vetter@...ll.ch>, 
	Rob Clark <robdclark@...omium.org>, Stéphane Marchesin <marcheu@...omium.org>, 
	"T . J . Mercier" <tjmercier@...gle.com>, Kenny.Ho@....com, 
	Christian König <christian.koenig@....com>, Brian Welty <brian.welty@...el.com>, 
	Tvrtko Ursulin <tvrtko.ursulin@...el.com>
Subject: Re: [RFC 1/8] cgroup: Add the DRM cgroup controller

Hello.

On Tue, Oct 24, 2023 at 05:07:20PM +0100, Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com> wrote:
> +struct drm_cgroup_state {
> +	struct cgroup_subsys_state css;
> +};
> +
> +struct drm_root_cgroup_state {
> +	struct drm_cgroup_state drmcs;
> +};
> +
> +static struct drm_root_cgroup_state root_drmcs;

Special struct type for root state is uncommon.
Have 
struct drm_cgroup_state root_drmcs;
and possible future members can be global state variables.


> +static void drmcs_free(struct cgroup_subsys_state *css)
> +{
> +	struct drm_cgroup_state *drmcs = css_to_drmcs(css);
> +
> +	if (drmcs != &root_drmcs.drmcs)
> +		kfree(drmcs);
> +}

I think it can be relied on root cgroup not being ever free'd by cgroup
core.

Michal

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