linux-kernel - Re: [PATCH bpf-next 0/4] Support storing struct cgroup * objects as kptrs

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Date:   Tue, 22 Nov 2022 12:44:12 -1000
From:   Tejun Heo <tj@...nel.org>
To:     David Vernet <void@...ifault.com>
Cc:     bpf@...r.kernel.org, ast@...nel.org, andrii@...nel.org,
        daniel@...earbox.net, martin.lau@...ux.dev, yhs@...com,
        song@...nel.org, sdf@...gle.com, john.fastabend@...il.com,
        kpsingh@...nel.org, jolsa@...nel.org, haoluo@...gle.com,
        kernel-team@...com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next 0/4] Support storing struct cgroup * objects as
 kptrs

On Mon, Nov 21, 2022 at 11:54:54PM -0600, David Vernet wrote:
> In [0], we added support for storing struct task_struct * objects as
> kptrs. This patch set extends this effort to also include storing struct
> cgroup * object as kptrs.
> 
> As with tasks, there are many possible use cases for storing cgroups in
> maps. During tracing, for example, it could be useful to query cgroup
> statistics such as PSI averages, or tracking which tasks are migrating
> to and from the cgroup.
> 
> [0]: https://lore.kernel.org/all/20221120051004.3605026-1-void@manifault.com/
> 
> David Vernet (4):
>   bpf: Enable cgroups to be used as kptrs
>   selftests/bpf: Add cgroup kfunc / kptr selftests
>   bpf: Add bpf_cgroup_ancestor() kfunc
>   selftests/bpf: Add selftests for bpf_cgroup_ancestor() kfunc

>From cgroup POV:

 Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun