[PATCH v6 4/7] perf util: Link stream pair

[Jin Yao]

In previous patch, we have created an evsel_streams for one event,
and top N hottest streams will be saved in a stream array in
evsel_streams.

This patch compares total streams among two evsel_streams.

Once two streams are fully matched, they will be linked as
a pair. From the pair, we can know which streams are matched.

Signed-off-by: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
---
 v6:
   - Rebase to perf/core

 v5:
   - Remove enum stream_type

 v4:
   - New patch in v4.

 tools/perf/util/stream.c | 40 ++++++++++++++++++++++++++++++++++++++++
 tools/perf/util/stream.h |  4 ++++
 2 files changed, 44 insertions(+)

diff --git a/tools/perf/util/stream.c b/tools/perf/util/stream.c
index 7882a7f05d97..e96e21d6e07b 100644
--- a/tools/perf/util/stream.c
+++ b/tools/perf/util/stream.c
@@ -157,3 +157,43 @@ struct evsel_streams *evsel_streams_get(struct evsel_streams *es,
 
 	return NULL;
 }
+
+static struct stream *stream_callchain_match(struct stream *base_stream,
+					     struct evsel_streams *es_pair)
+{
+	for (int i = 0; i < es_pair->nr_streams; i++) {
+		struct stream *pair_stream = &es_pair->streams[i];
+
+		if (callchain_cnode_matched(base_stream->cnode,
+					    pair_stream->cnode)) {
+			return pair_stream;
+		}
+	}
+
+	return NULL;
+}
+
+static struct stream *stream_match(struct stream *base_stream,
+				   struct evsel_streams *es_pair)
+{
+	return stream_callchain_match(base_stream, es_pair);
+}
+
+static void stream_link(struct stream *base_stream, struct stream *pair_stream)
+{
+	base_stream->pair_cnode = pair_stream->cnode;
+	pair_stream->pair_cnode = base_stream->cnode;
+}
+
+void match_evsel_streams(struct evsel_streams *es_base,
+			 struct evsel_streams *es_pair)
+{
+	for (int i = 0; i < es_base->nr_streams; i++) {
+		struct stream *base_stream = &es_base->streams[i];
+		struct stream *pair_stream;
+
+		pair_stream = stream_match(base_stream, es_pair);
+		if (pair_stream)
+			stream_link(base_stream, pair_stream);
+	}
+}
diff --git a/tools/perf/util/stream.h b/tools/perf/util/stream.h
index 66f61d954eef..2eb6f17a834e 100644
--- a/tools/perf/util/stream.h
+++ b/tools/perf/util/stream.h
@@ -6,6 +6,7 @@
 
 struct stream {
 	struct callchain_node	*cnode;
+	struct callchain_node	*pair_cnode;
 };
 
 struct evsel_streams {
@@ -23,4 +24,7 @@ struct evsel_streams *perf_evlist__create_streams(struct evlist *evlist,
 struct evsel_streams *evsel_streams_get(struct evsel_streams *es,
 					int nr_evsel, int evsel_idx);
 
+void match_evsel_streams(struct evsel_streams *es_base,
+			 struct evsel_streams *es_pair);
+
 #endif /* __PERF_STREAM_H */
-- 
2.17.1