netdev - Re: [PATCH bpf-next v7 5/8] selftests/bpf: Test cgroup

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Date:   Mon, 8 Aug 2022 17:20:25 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Hao Luo <haoluo@...gle.com>
Cc:     linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        cgroups@...r.kernel.org, netdev@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        KP Singh <kpsingh@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Michal Koutny <mkoutny@...e.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        David Rientjes <rientjes@...gle.com>,
        Stanislav Fomichev <sdf@...gle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Yosry Ahmed <yosryahmed@...gle.com>
Subject: Re: [PATCH bpf-next v7 5/8] selftests/bpf: Test cgroup_iter.

On Fri, Aug 5, 2022 at 2:49 PM Hao Luo <haoluo@...gle.com> wrote:
>
> Add a selftest for cgroup_iter. The selftest creates a mini cgroup tree
> of the following structure:
>
>     ROOT (working cgroup)
>      |
>    PARENT
>   /      \
> CHILD1  CHILD2
>
> and tests the following scenarios:
>
>  - invalid cgroup fd.
>  - pre-order walk over descendants from PARENT.
>  - post-order walk over descendants from PARENT.
>  - walk of ancestors from PARENT.
>  - walk from PARENT in the default order, which is pre-order.
>  - process only a single object (i.e. PARENT).
>  - early termination.
>
> Acked-by: Yonghong Song <yhs@...com>
> Signed-off-by: Hao Luo <haoluo@...gle.com>
> ---

LGTM.

Acked-by: Andrii Nakryiko <andrii@...nel.org>

>  .../selftests/bpf/prog_tests/cgroup_iter.c    | 237 ++++++++++++++++++
>  tools/testing/selftests/bpf/progs/bpf_iter.h  |   7 +
>  .../testing/selftests/bpf/progs/cgroup_iter.c |  39 +++
>  3 files changed, 283 insertions(+)
>  create mode 100644 tools/testing/selftests/bpf/prog_tests/cgroup_iter.c
>  create mode 100644 tools/testing/selftests/bpf/progs/cgroup_iter.c
>

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