[PATCH 10/20] perf stat: Factor out evsel__count_has_error()

[Namhyung Kim]

It's possible to have 0 enabled/running time for some per-task or per-cgroup
events since it's not scheduled on any CPU.  Treating the whole event as
failed would not work in this case.  Thinking again, the code only existed
when any CPU-level aggregation is enabled (like per-socket, per-core, ...).

To make it clearer, factor out the condition check into the new
evsel__count_has_error() function and add some comments.

Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
 tools/perf/util/stat.c | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
index 99874254809d..dc075d5a0f72 100644
--- a/tools/perf/util/stat.c
+++ b/tools/perf/util/stat.c
@@ -381,6 +381,25 @@ static int check_per_pkg(struct evsel *counter, struct perf_counts_values *vals,
 	return ret;
 }
 
+static bool evsel__count_has_error(struct evsel *evsel,
+				   struct perf_counts_values *count,
+				   struct perf_stat_config *config)
+{
+	/* the evsel was failed already */
+	if (evsel->err || evsel->counts->scaled == -1)
+		return true;
+
+	/* this is meaningful for CPU aggregation modes only */
+	if (config->aggr_mode == AGGR_GLOBAL)
+		return false;
+
+	/* it's considered ok when it actually ran */
+	if (count->ena != 0 && count->run != 0)
+		return false;
+
+	return true;
+}
+
 static int
 process_counter_values(struct perf_stat_config *config, struct evsel *evsel,
 		       int cpu_map_idx, int thread,
@@ -420,8 +439,7 @@ process_counter_values(struct perf_stat_config *config, struct evsel *evsel,
 			 * When any result is bad, make them all to give
 			 * consistent output in interval mode.
 			 */
-			if (count->ena == 0 || count->run == 0 ||
-			    evsel->counts->scaled == -1) {
+			if (evsel__count_has_error(evsel, count, config) && !ps_aggr->failed) {
 				ps_aggr->counts.val = 0;
 				ps_aggr->counts.ena = 0;
 				ps_aggr->counts.run = 0;
-- 
2.38.0.413.g74048e4d9e-goog