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Users of BPF sooner or later discover perf_event_output() helpers and BPF_MAP_TYPE_PERF_EVENT_ARRAY. Dumping this array type is not possible, however, we can add simple reading of perf events. Create a new event_pipe subcommand for maps, this sub command will only work with BPF_MAP_TYPE_PERF_EVENT_ARRAY maps. Parts of the code from samples/bpf/trace_output_user.c. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> |
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