[PATCH v3 33/35] perf pmus: Add function to return count of core PMUs

Ian Rogers
2023-05-24T22:22:35Z

Add perf_pmus__num_core_pmus that will count core PMUs holding the
result in a static. Reuse for perf_pmus__num_mem_pmus.

Signed-off-by: Ian Rogers <irogers@google.com>
---
tools/perf/util/pmus.c | 21 ++++++++++++++-------
tools/perf/util/pmus.h | 1 +
2 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/pmus.c b/tools/perf/util/pmus.c
index 6ecccb5ad03e..bf927aed162e 100644
--- a/tools/perf/util/pmus.c
+++ b/tools/perf/util/pmus.c
@@ -229,14 +229,8 @@ const struct perf_pmu *perf_pmus__pmu_for_pmu_filter(const char *str)

int perf_pmus__num_mem_pmus(void)
{
- struct perf_pmu *pmu = NULL;
- int count = 0;
-
/* All core PMUs are for mem events. */
- while ((pmu = perf_pmus__scan_core(pmu)) != NULL)
- count++;
-
- return count;
+ return perf_pmus__num_core_pmus();
}

/** Struct for ordering events as output in perf list. */
@@ -488,6 +482,19 @@ bool perf_pmus__has_hybrid(void)
return has_hybrid;
}

+int perf_pmus__num_core_pmus(void)
+{
+ static int count;
+
+ if (!count) {
+ struct perf_pmu *pmu = NULL;
+
+ while ((pmu = perf_pmus__scan_core(pmu)) != NULL)
+ count++;
+ }
+ return count;
+}
+
struct perf_pmu *evsel__find_pmu(const struct evsel *evsel)
{
struct perf_pmu *pmu = evsel->pmu;
diff --git a/tools/perf/util/pmus.h b/tools/perf/util/pmus.h
index 9de0222ed52b..27400a027d41 100644
--- a/tools/perf/util/pmus.h
+++ b/tools/perf/util/pmus.h
@@ -19,5 +19,6 @@ int perf_pmus__num_mem_pmus(void);
void perf_pmus__print_pmu_events(const struct print_callbacks *print_cb, void *print_state);
bool perf_pmus__have_event(const char *pname, const char *name);
bool perf_pmus__has_hybrid(void);
+int perf_pmus__num_core_pmus(void);

#endif /* __PMUS_H */
--
2.40.1.698.g37aff9b760-goog