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Subject[PATCH 20/19] perf stat: Factor out evsel__count_has_error()
Date
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@kernel.org>
---
tools/perf/util/stat.c | 25 +++++++++++++++++++++----
1 file changed, 21 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
index 6ab9c58beca7..9dfa8cac6bc4 100644
--- a/tools/perf/util/stat.c
+++ b/tools/perf/util/stat.c
@@ -396,6 +396,25 @@ 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,
@@ -450,11 +469,9 @@ 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. But per-task counters can have 0 enabled time
- * when some tasks are idle.
+ * in interval mode.
*/
- if (((count->ena == 0 || count->run == 0) && cpu.cpu != -1) ||
- 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
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