[PATCH v2 03/14] perf util: Return per-event callchain streams

Jin Yao
2020-03-13T07:12:02Z

In previous patch, we have created a 'struct callchain_streams'
array and each array entry contains per-event callchain streams.

This patch returns the pointer of per-event callchain streams
according to the evsel_idx.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
tools/perf/util/callchain.c | 12 ++++++++++++
tools/perf/util/callchain.h | 4 ++++
2 files changed, 16 insertions(+)

diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index 0c028caaeb19..bf66f33debd4 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -1721,3 +1721,15 @@ struct callchain_streams *callchain_evsel_streams_create(struct evlist *evlist,
*nr_evsel_streams = nr_evsel;
return callchain_streams;
}
+
+struct callchain_streams *callchain_evsel_streams_get(struct callchain_streams *cs,
+ int nr_streams_max,
+ int evsel_idx)
+{
+ for (int i = 0; i < nr_streams_max; i++) {
+ if (cs[i].evsel_idx == evsel_idx)
+ return &cs[i];
+ }
+
+ return NULL;
+}
diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h
index 5852990cdf60..4e881361e154 100644
--- a/tools/perf/util/callchain.h
+++ b/tools/perf/util/callchain.h
@@ -305,4 +305,8 @@ struct callchain_streams *callchain_evsel_streams_create(struct evlist *evlist,
int nr_streams_max,
int *nr_evsel_streams);

+struct callchain_streams *callchain_evsel_streams_get(struct callchain_streams *cs,
+ int nr_streams_max,
+ int evsel_idx);
+
#endif /* __PERF_CALLCHAIN_H */
--
2.17.1