perf streams: Link stream pair
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@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20201009022845.13141-5-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/stream.c b/tools/perf/util/stream.c
index e1c7d6c..0d6a745 100644
--- a/tools/perf/util/stream.c
+++ b/tools/perf/util/stream.c
@@ -175,3 +175,43 @@ struct evsel_streams *evsel_streams__entry(struct evlist_streams *els,
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 evsel_streams__match(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 f013356..cb131f4 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 {
@@ -30,4 +31,7 @@ struct evlist_streams *evlist__create_streams(struct evlist *evlist,
struct evsel_streams *evsel_streams__entry(struct evlist_streams *els,
int evsel_idx);
+void evsel_streams__match(struct evsel_streams *es_base,
+ struct evsel_streams *es_pair);
+
#endif /* __PERF_STREAM_H */