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bpf: implement bpf_get_current_cgroup_id() helper
bpf has been used extensively for tracing. For example, bcc contains an almost full set of bpf-based tools to trace kernel and user functions/events. Most tracing tools are currently either filtered based on pid or system-wide. Containers have been used quite extensively in industry and cgroup is often used together to provide resource isolation and protection. Several processes may run inside the same container. It is often desirable to get container-level tracing results as well, e.g. syscall count, function count, I/O activity, etc. This patch implements a new helper, bpf_get_current_cgroup_id(), which will return cgroup id based on the cgroup within which the current task is running. The later patch will provide an example to show that userspace can get the same cgroup id so it could configure a filter or policy in the bpf program based on task cgroup id. The helper is currently implemented for tracing. It can be added to other program types as well when needed. Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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@ -746,6 +746,7 @@ extern const struct bpf_func_proto bpf_get_stackid_proto;
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extern const struct bpf_func_proto bpf_get_stack_proto;
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extern const struct bpf_func_proto bpf_sock_map_update_proto;
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extern const struct bpf_func_proto bpf_sock_hash_update_proto;
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extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
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/* Shared helpers among cBPF and eBPF. */
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void bpf_user_rnd_init_once(void);
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