diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
index 27be7ce2fff4e0..8fdef47005e608 100644
--- a/tools/perf/util/stat-shadow.c
+++ b/tools/perf/util/stat-shadow.c
@@ -842,6 +842,20 @@ static void generic_metric(struct perf_stat_config *config,
 	expr__ctx_clear(&pctx);
 }
 
+double test_generic_metric(struct metric_expr *mexp, int cpu, struct runtime_stat *st)
+{
+	struct expr_parse_ctx pctx;
+	double ratio;
+
+	if (prepare_metric(mexp->metric_events, &pctx, cpu, st) < 0)
+		return 0.;
+
+	if (expr__parse(&ratio, &pctx, mexp->metric_expr, 1))
+		return 0.;
+
+	return ratio;
+}
+
 void perf_stat__print_shadow_stats(struct perf_stat_config *config,
 				   struct evsel *evsel,
 				   double avg, int cpu,
diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
index f75ae679eb281c..6911c7249199a0 100644
--- a/tools/perf/util/stat.h
+++ b/tools/perf/util/stat.h
@@ -230,4 +230,7 @@ perf_evlist__print_counters(struct evlist *evlist,
 			    struct target *_target,
 			    struct timespec *ts,
 			    int argc, const char **argv);
+
+struct metric_expr;
+double test_generic_metric(struct metric_expr *mexp, int cpu, struct runtime_stat *st);
 #endif