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SubjectRe: [PATCH bpf-next v1 3/5] bpf: Introduce cgroup iter
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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.
>

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