Re: [PATCH bpf-next v1 3/5] bpf: Introduce cgroup iter

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On Fri, May 20, 2022 at 5:59 PM Yonghong Song <yhs@xxxxxx> wrote:
> On 5/20/22 3:57 PM, Tejun Heo wrote:
> > Hello,
> >
> > On Fri, May 20, 2022 at 03:19:19PM -0700, Alexei Starovoitov wrote:
> >> We have bpf_map iterator that walks all bpf maps.
> >> When map iterator is parametrized with map_fd the iterator walks
> >> all elements of that map.
> >> cgroup iterator should have similar semantics.
> >> When non-parameterized it will walk all cgroups and their descendent
> >> depth first way. I believe that's what Yonghong is proposing.
> >> When parametrized it will start from that particular cgroup and
> >> walk all descendant of that cgroup only.
> >> The bpf prog can stop the iteration right away with ret 1.
> >> Maybe we can add two parameters. One -> cgroup_fd to use and another ->
> >> the order of iteration css_for_each_descendant_pre vs _post.
> >> wdyt?
> >
> > Sounds perfectly reasonable to me.
>
> This works for me too. Thanks!
>

This sounds good to me. Thanks. Let's try to do it in the next iteration.



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