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bpftool: Display missed count for kprobe perf link

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Adding 'missed' field to display missed counts for kprobes
attached by perf event link, like:

  # bpftool link
  5: perf_event  prog 82
          kprobe ffffffff815203e0 ksys_write
  6: perf_event  prog 83
          kprobe ffffffff811d1e50 scheduler_tick  missed 682217

  # bpftool link -jp
  [{
          "id": 5,
          "type": "perf_event",
          "prog_id": 82,
          "retprobe": false,
          "addr": 18446744071584220128,
          "func": "ksys_write",
          "offset": 0,
          "missed": 0
      },{
          "id": 6,
          "type": "perf_event",
          "prog_id": 83,
          "retprobe": false,
          "addr": 18446744071580753488,
          "func": "scheduler_tick",
          "offset": 0,
          "missed": 693469
      }
  ]

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/bpf/20230920213145.1941596-7-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2023-09-20 23:31:42 +02:00 committed by Andrii Nakryiko
parent b24fc35521
commit b563b9bae8
1 changed files with 3 additions and 0 deletions
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3
tools/bpf/bpftool/link.c
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@ -302,6 +302,7 @@ show_perf_event_kprobe_json(struct bpf_link_info *info, json_writer_t *wtr)
jsonw_string_field(wtr, "func",
u64_to_ptr(info->perf_event.kprobe.func_name));
jsonw_uint_field(wtr, "offset", info->perf_event.kprobe.offset);
jsonw_uint_field(wtr, "missed", info->perf_event.kprobe.missed);
}
static void
@ -686,6 +687,8 @@ static void show_perf_event_kprobe_plain(struct bpf_link_info *info)
printf("%s", buf);
if (info->perf_event.kprobe.offset)
printf("+%#x", info->perf_event.kprobe.offset);
if (info->perf_event.kprobe.missed)
printf(" missed %llu", info->perf_event.kprobe.missed);
printf(" ");
}