linux-kernel - Re: [PATCH v2 02/23] bpf: initial support for attaching struct ops to cgroups

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Message-ID: <aQJZgd8-xXpK-Af8@slm.duckdns.org>
Date: Wed, 29 Oct 2025 08:14:25 -1000
From: Tejun Heo <tj@...nel.org>
To: Roman Gushchin <roman.gushchin@...ux.dev>
Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org,
	Alexei Starovoitov <ast@...nel.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...nel.org>,
	Shakeel Butt <shakeel.butt@...ux.dev>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrii Nakryiko <andrii@...nel.org>,
	JP Kobryn <inwardvessel@...il.com>, linux-mm@...ck.org,
	cgroups@...r.kernel.org, bpf@...r.kernel.org,
	Martin KaFai Lau <martin.lau@...nel.org>,
	Song Liu <song@...nel.org>,
	Kumar Kartikeya Dwivedi <memxor@...il.com>
Subject: Re: [PATCH v2 02/23] bpf: initial support for attaching struct ops
 to cgroups

Hello,

On Mon, Oct 27, 2025 at 04:17:05PM -0700, Roman Gushchin wrote:
> @@ -1849,6 +1849,7 @@ struct bpf_struct_ops_link {
>  	struct bpf_link link;
>  	struct bpf_map __rcu *map;
>  	wait_queue_head_t wait_hup;
> +	u64 cgroup_id;
>  };

BTW, for sched_ext sub-sched support, I'm just adding cgroup_id to
struct_ops, which seems to work fine. It'd be nice to align on the same
approach. What are the benefits of doing this through fd?

Thanks.

-- 
tejun