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>
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;
}
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]);
}
}
* 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
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;
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);
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)
{
evlist__for_each_entry(evlist, pos) {
struct hists *hists = evsel__hists(pos);
+ u64 total_samples = hists->stats.nr_samples;
+
+ total_samples += hists->stats.nr_lost_samples;
+ total_samples += hists->stats.nr_dropped_samples;
- if (symbol_conf.skip_empty && !hists->stats.nr_samples &&
- !hists->stats.nr_lost_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;
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,
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;
}
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:
projects / linux-2.6-microblaze.git / commitdiff