Commit fa79aa64 authored by Jin Yao's avatar Jin Yao Committed by Arnaldo Carvalho de Melo
Browse files

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: default avatarJin Yao <yao.jin@linux.intel.com>
Acked-by: default avatarJiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20201009022845.13141-5-yao.jin@linux.intel.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 47ef8398

tools/perf/util/stream.c

+40 −0
Original line number Diff line number Diff line
@@ -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);

	}

}

tools/perf/util/stream.h

+4 −0
Original line number Diff line number Diff line
@@ -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 */

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