[PATCH/RFC 10/16] perf hist: Add events_stats__add() and hists__add_stats()

[Namhyung Kim <namhyung@kernel.org>]

These two functions are to update event and hists stats.  They'll be
used by multi threads to update local stats in the later patch.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/hist.c | 23 +++++++++++++++++++++++
 tools/perf/util/hist.h |  6 ++++++
 2 files changed, 29 insertions(+)

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index a12e5022fe04..08396a7fea23 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -1347,6 +1347,29 @@ void events_stats__inc(struct events_stats *stats, u32 type)
 	++stats->nr_events[type];
 }
 
+void events_stats__add(struct events_stats *dst, struct events_stats *src)
+{
+	int i;
+
+#define ADD(_field)  dst->_field += src->_field
+
+	ADD(total_period);
+	ADD(total_non_filtered_period);
+	ADD(total_lost);
+	ADD(total_invalid_chains);
+	ADD(nr_non_filtered_samples);
+	ADD(nr_lost_warned);
+	ADD(nr_unknown_events);
+	ADD(nr_invalid_chains);
+	ADD(nr_unknown_id);
+	ADD(nr_unprocessable_samples);
+
+	for (i = 0; i < PERF_RECORD_HEADER_MAX; i++)
+		ADD(nr_events[i]);
+
+#undef ADD
+}
+
 void hists__inc_nr_events(struct hists *hists, u32 type)
 {
 	events_stats__inc(&hists->stats, type);
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 670720ef8acd..725afce73738 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -141,8 +141,14 @@ void hists__inc_stats(struct hists *hists, struct hist_entry *h);
 void hists__inc_nr_events(struct hists *hists, u32 type);
 void hists__inc_nr_samples(struct hists *hists, bool filtered);
 void events_stats__inc(struct events_stats *stats, u32 type);
+void events_stats__add(struct events_stats *dst, struct events_stats *src);
 size_t events_stats__fprintf(struct events_stats *stats, FILE *fp);
 
+static inline void hists__add_stats(struct hists *dst, struct hists *src)
+{
+	events_stats__add(&dst->stats, &src->stats);
+}
+
 size_t hists__fprintf(struct hists *hists, bool show_header, int max_rows,
 		      int max_cols, float min_pcnt, FILE *fp);
 size_t perf_evlist__fprintf_nr_events(struct perf_evlist *evlist, FILE *fp);
-- 
2.6.2