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perf streams: Link stream pair

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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>
This commit is contained in:
Jin Yao 2020-10-09 10:28:42 +08:00 committed by Arnaldo Carvalho de Melo
parent 47ef8398c3
commit fa79aa6485
2 changed files with 44 additions and 0 deletions
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40
tools/perf/util/stream.c
View file

@ -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);
}
}

4
tools/perf/util/stream.h
View file

@ -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 */