[PATCH 4/5] perf hist: Add nr_lost_samples to hist_stats

[Namhyung Kim <namhyung@kernel.org>]

This is a preparation to display accurate lost sample counts for
each evsel.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/events_stats.h | 1 +
 tools/perf/util/hist.c         | 5 +++++
 tools/perf/util/hist.h         | 1 +
 3 files changed, 7 insertions(+)

diff --git a/tools/perf/util/events_stats.h b/tools/perf/util/events_stats.h
index 040ab9d0a803..8fecc9fbaecc 100644
--- a/tools/perf/util/events_stats.h
+++ b/tools/perf/util/events_stats.h
@@ -47,6 +47,7 @@ struct hists_stats {
 	u64 total_non_filtered_period;
 	u32 nr_samples;
 	u32 nr_non_filtered_samples;
+	u32 nr_lost_samples;
 };
 
 void events_stats__inc(struct events_stats *stats, u32 type);
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 698add038cec..8cab049f7119 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -2335,6 +2335,11 @@ void hists__inc_nr_samples(struct hists *hists, bool filtered)
 		hists->stats.nr_non_filtered_samples++;
 }
 
+void hists__inc_nr_lost_samples(struct hists *hists, u32 lost)
+{
+	hists->stats.nr_lost_samples += lost;
+}
+
 static struct hist_entry *hists__add_dummy_entry(struct hists *hists,
 						 struct hist_entry *pair)
 {
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 508428b2c1b2..c7a7a3fa0b87 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -201,6 +201,7 @@ void hists__reset_stats(struct hists *hists);
 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);
 
 size_t hists__fprintf(struct hists *hists, bool show_header, int max_rows,
 		      int max_cols, float min_pcnt, FILE *fp,
-- 
2.37.2.789.g6183377224-goog