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

[Yonghong Song]

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!

> Thanks.