tools/bpftool: Add documentation and sample output for process info
Add statements about bpftool being able to discover process info, holding reference to BPF map, prog, link, or BTF. Show example output as well. Signed-off-by: NAndrii Nakryiko <andriin@fb.com> Signed-off-by: NAlexei Starovoitov <ast@kernel.org> Reviewed-by: NQuentin Monnet <quentin@isovalent.com> Link: https://lore.kernel.org/bpf/20200619231703.738941-10-andriin@fb.com
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