bpf: add new BPF_CGROUP_ITER_CHILDREN control option #10851
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Currently, the BPF cgroup iterator supports walking descendants in either pre-order (BPF_CGROUP_ITER_DESCENDANTS_PRE) or post-order (BPF_CGROUP_ITER_DESCENDANTS_POST). These modes perform an exhaustive depth-first search (DFS) of the hierarchy. In scenarios where a BPF program may need to inspect only the direct children of a given parent cgroup, a full DFS is unnecessarily expensive. This patch introduces a new BPF cgroup iterator control option, BPF_CGROUP_ITER_CHILDREN. This control option restricts the traversal to the immediate children of a specified parent cgroup, allowing for more targeted and efficient iteration, particularly when exhaustive depth-first search (DFS) traversal is not required. Signed-off-by: Matt Bobrowski <mattbobrowski@google.com>
Extend some of the existing CSS iterator selftests such that they cover the newly introduced BPF_CGROUP_ITER_CHILDREN iterator control option. Signed-off-by: Matt Bobrowski <mattbobrowski@google.com>
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Upstream branch: 8016abd |
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=1047455 irrelevant now. Closing PR. |
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Pull request for series with
subject: bpf: add new BPF_CGROUP_ITER_CHILDREN control option
version: 2
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1047455