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perf tools: Print lost samples due to BPF filter

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Print the actual dropped sample count in the event stat.

  $ sudo perf record -o- -e cycles --filter 'period < 10000' \
      -e instructions --filter 'ip > 0x8000000000000000' perf test -w noploop | \
      perf report --stat -i-
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.058 MB - ]

  Aggregated stats:
                 TOTAL events:        469
                  MMAP events:        268  (57.1%)
                  COMM events:          2  ( 0.4%)
                  EXIT events:          1  ( 0.2%)
                SAMPLE events:         16  ( 3.4%)
                 MMAP2 events:         22  ( 4.7%)
          LOST_SAMPLES events:          2  ( 0.4%)
               KSYMBOL events:         89  (19.0%)
             BPF_EVENT events:         39  ( 8.3%)
                  ATTR events:          2  ( 0.4%)
        FINISHED_ROUND events:          1  ( 0.2%)
              ID_INDEX events:          1  ( 0.2%)
            THREAD_MAP events:          1  ( 0.2%)
               CPU_MAP events:          1  ( 0.2%)
          EVENT_UPDATE events:          2  ( 0.4%)
             TIME_CONV events:          1  ( 0.2%)
               FEATURE events:         20  ( 4.3%)
         FINISHED_INIT events:          1  ( 0.2%)
  cycles stats:
                SAMPLE events:          2
    LOST_SAMPLES (BPF) events:       4010
  instructions stats:
                SAMPLE events:         14
    LOST_SAMPLES (BPF) events:       3990

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: KP Singh <kpsingh@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20240820154504.128923-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2024-08-20 08:45:03 -07:00 committed by Arnaldo Carvalho de Melo
parent 0fe2b18ddc
commit 1a5474a779
7 changed files with 45 additions and 13 deletions
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9
tools/perf/builtin-report.c
View File

@ -795,8 +795,13 @@ static int count_lost_samples_event(const struct perf_tool *tool,
evsel = evlist__id2evsel(rep->session->evlist, sample->id);
if (evsel) {
hists__inc_nr_lost_samples(evsel__hists(evsel),
event->lost_samples.lost);
struct hists *hists = evsel__hists(evsel);
u32 count = event->lost_samples.lost;
if (event->header.misc & PERF_RECORD_MISC_LOST_SAMPLES_BPF)
hists__inc_nr_dropped_samples(hists, count);
else
hists__inc_nr_lost_samples(hists, count);
}
return 0;
}

4
tools/perf/ui/stdio/hist.c
View File

@ -913,11 +913,11 @@ size_t events_stats__fprintf(struct events_stats *stats, FILE *fp)
continue;
if (i && total) {
ret += fprintf(fp, "%16s events: %10d (%4.1f%%)\n",
ret += fprintf(fp, "%20s events: %10d (%4.1f%%)\n",
name, stats->nr_events[i],
100.0 * stats->nr_events[i] / total);
} else {
ret += fprintf(fp, "%16s events: %10d\n",
ret += fprintf(fp, "%20s events: %10d\n",
name, stats->nr_events[i]);
}
}

15
tools/perf/util/events_stats.h
View File

@ -18,7 +18,18 @@
* PERF_RECORD_LOST_SAMPLES event. The number of lost-samples events is stored
* in .nr_events[PERF_RECORD_LOST_SAMPLES] while total_lost_samples tells
* exactly how many samples the kernel in fact dropped, i.e. it is the sum of
* all struct perf_record_lost_samples.lost fields reported.
* all struct perf_record_lost_samples.lost fields reported without setting the
* misc field in the header.
*
* The BPF program can discard samples according to the filter expressions given
* by the user. This number is kept in a BPF map and dumped at the end of perf
* record in a PERF_RECORD_LOST_SAMPLES event. To differentiate it from other
* lost samples, perf tools sets PERF_RECORD_MISC_LOST_SAMPLES_BPF flag in the
* header.misc field. The number of dropped-samples events is stored in
* .nr_events[PERF_RECORD_LOST_SAMPLES] while total_dropped_samples tells
* exactly how many samples the BPF program in fact dropped, i.e. it is the sum
* of all struct perf_record_lost_samples.lost fields reported with the misc
* field set in the header.
*
* The total_period is needed because by default auto-freq is used, so
* multiplying nr_events[PERF_EVENT_SAMPLE] by a frequency isn't possible to get
@ -28,6 +39,7 @@
struct events_stats {
u64 total_lost;
u64 total_lost_samples;
u64 total_dropped_samples;
u64 total_aux_lost;
u64 total_aux_partial;
u64 total_aux_collision;
@ -48,6 +60,7 @@ struct hists_stats {
u32 nr_samples;
u32 nr_non_filtered_samples;
u32 nr_lost_samples;
u32 nr_dropped_samples;
};
void events_stats__inc(struct events_stats *stats, u32 type);

19
tools/perf/util/hist.c
View File

@ -2385,6 +2385,11 @@ void hists__inc_nr_lost_samples(struct hists *hists, u32 lost)
hists->stats.nr_lost_samples += lost;
}
void hists__inc_nr_dropped_samples(struct hists *hists, u32 lost)
{
hists->stats.nr_dropped_samples += lost;
}
static struct hist_entry *hists__add_dummy_entry(struct hists *hists,
struct hist_entry *pair)
{
@ -2729,18 +2734,24 @@ size_t evlist__fprintf_nr_events(struct evlist *evlist, FILE *fp)
evlist__for_each_entry(evlist, pos) {
struct hists *hists = evsel__hists(pos);
u64 total_samples = hists->stats.nr_samples;
if (symbol_conf.skip_empty && !hists->stats.nr_samples &&
!hists->stats.nr_lost_samples)
total_samples += hists->stats.nr_lost_samples;
total_samples += hists->stats.nr_dropped_samples;
if (symbol_conf.skip_empty && total_samples == 0)
continue;
ret += fprintf(fp, "%s stats:\n", evsel__name(pos));
if (hists->stats.nr_samples)
ret += fprintf(fp, "%16s events: %10d\n",
ret += fprintf(fp, "%20s events: %10d\n",
"SAMPLE", hists->stats.nr_samples);
if (hists->stats.nr_lost_samples)
ret += fprintf(fp, "%16s events: %10d\n",
ret += fprintf(fp, "%20s events: %10d\n",
"LOST_SAMPLES", hists->stats.nr_lost_samples);
if (hists->stats.nr_dropped_samples)
ret += fprintf(fp, "%20s events: %10d\n",
"LOST_SAMPLES (BPF)", hists->stats.nr_dropped_samples);
}
return ret;

1
tools/perf/util/hist.h
View File

@ -372,6 +372,7 @@ void hists__inc_stats(struct hists *hists, struct hist_entry *h);
void hists__inc_nr_events(struct hists *hists);
void hists__inc_nr_samples(struct hists *hists, bool filtered);
void hists__inc_nr_lost_samples(struct hists *hists, u32 lost);
void hists__inc_nr_dropped_samples(struct hists *hists, u32 lost);
size_t hists__fprintf(struct hists *hists, bool show_header, int max_rows,
int max_cols, float min_pcnt, FILE *fp,

5
tools/perf/util/machine.c
View File

@ -642,8 +642,9 @@ int machine__process_lost_event(struct machine *machine __maybe_unused,
int machine__process_lost_samples_event(struct machine *machine __maybe_unused,
union perf_event *event, struct perf_sample *sample)
{
dump_printf(": id:%" PRIu64 ": lost samples :%" PRI_lu64 "\n",
sample->id, event->lost_samples.lost);
dump_printf(": id:%" PRIu64 ": lost samples :%" PRI_lu64 "%s\n",
sample->id, event->lost_samples.lost,
event->header.misc & PERF_RECORD_MISC_LOST_SAMPLES_BPF ? " (BPF)" : "");
return 0;
}

5
tools/perf/util/session.c
View File

@ -1290,8 +1290,9 @@ static int machines__deliver_event(struct machines *machines,
evlist->stats.total_lost += event->lost.lost;
return tool->lost(tool, event, sample, machine);
case PERF_RECORD_LOST_SAMPLES:
if (tool->lost_samples == perf_event__process_lost_samples &&
!(event->header.misc & PERF_RECORD_MISC_LOST_SAMPLES_BPF))
if (event->header.misc & PERF_RECORD_MISC_LOST_SAMPLES_BPF)
evlist->stats.total_dropped_samples += event->lost_samples.lost;
else if (tool->lost_samples == perf_event__process_lost_samples)
evlist->stats.total_lost_samples += event->lost_samples.lost;
return tool->lost_samples(tool, event, sample, machine);
case PERF_RECORD_READ: