Re: [RFC PATCH bpf-next 8/9] bpf: Introduce cgroup iter

[Tejun Heo]

Hello,

On Tue, May 10, 2022 at 12:18:06AM +0000, Yosry Ahmed wrote:
> From: Hao Luo <haoluo@xxxxxxxxxx>
> 
> Introduce a new type of iter prog: cgroup. Unlike other bpf_iter, this
> iter doesn't iterate a set of kernel objects. Instead, it is supposed to
> be parameterized by a cgroup id and prints only that cgroup. So one
> needs to specify a target cgroup id when attaching this iter. The target
> cgroup's state can be read out via a link of this iter.

Is there a reason why this can't be a proper iterator which supports
lseek64() to locate a specific cgroup?

Thanks.

-- 
tejun