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perf report: Show per-event LOST SAMPLES stat

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Display lost samples with --stat (if not zero):

  $ perf report --stat
    Aggregated stats:
             TOTAL events:         64
              COMM events:          2  ( 3.1%)
              EXIT events:          1  ( 1.6%)
            SAMPLE events:         26  (40.6%)
             MMAP2 events:          4  ( 6.2%)
      LOST_SAMPLES events:          1  ( 1.6%)
              ATTR events:          2  ( 3.1%)
    FINISHED_ROUND events:          1  ( 1.6%)
          ID_INDEX events:          1  ( 1.6%)
        THREAD_MAP events:          1  ( 1.6%)
           CPU_MAP events:          1  ( 1.6%)
      EVENT_UPDATE events:          2  ( 3.1%)
         TIME_CONV events:          1  ( 1.6%)
           FEATURE events:         20  (31.2%)
     FINISHED_INIT events:          1  ( 1.6%)
  cycles:uH stats:
            SAMPLE events:         14
      LOST_SAMPLES events:          1
  instructions:uH stats:
            SAMPLE events:         12

Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220901195739.668604-6-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2022-09-01 12:57:39 -07:00 committed by Arnaldo Carvalho de Melo
parent 75b37db096
commit d7ba22d4a3
2 changed files with 24 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
tools/perf/builtin-report.c
View File

@ -752,6 +752,22 @@ static int count_sample_event(struct perf_tool *tool __maybe_unused,
return 0;
}
static int count_lost_samples_event(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine __maybe_unused)
{
struct report *rep = container_of(tool, struct report, tool);
struct evsel *evsel;
evsel = evlist__id2evsel(rep->session->evlist, sample->id);
if (evsel) {
hists__inc_nr_lost_samples(evsel__hists(evsel),
event->lost_samples.lost);
}
return 0;
}
static int process_attr(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct evlist **pevlist);
@ -761,6 +777,7 @@ static void stats_setup(struct report *rep)
memset(&rep->tool, 0, sizeof(rep->tool));
rep->tool.attr = process_attr;
rep->tool.sample = count_sample_event;
rep->tool.lost_samples = count_lost_samples_event;
rep->tool.no_warn = true;
}

10
tools/perf/util/hist.c
View File

@ -2683,12 +2683,16 @@ size_t evlist__fprintf_nr_events(struct evlist *evlist, FILE *fp,
evlist__for_each_entry(evlist, pos) {
struct hists *hists = evsel__hists(pos);
if (skip_empty && !hists->stats.nr_samples)
if (skip_empty && !hists->stats.nr_samples && !hists->stats.nr_lost_samples)
continue;
ret += fprintf(fp, "%s stats:\n", evsel__name(pos));
ret += fprintf(fp, "%16s events: %10d\n",
"SAMPLE", hists->stats.nr_samples);
if (hists->stats.nr_samples)
ret += fprintf(fp, "%16s events: %10d\n",
"SAMPLE", hists->stats.nr_samples);
if (hists->stats.nr_lost_samples)
ret += fprintf(fp, "%16s events: %10d\n",
"LOST_SAMPLES", hists->stats.nr_lost_samples);
}
return ret;