perf stat: Fix interval output values

[cascardo/linux.git] / tools / perf / util / stat.c

diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
index 2f901d1..afb0c45 100644 (file)
--- a/tools/perf/util/stat.c
+++ b/tools/perf/util/stat.c
@@ -310,7 +310,16 @@ int perf_stat_process_counter(struct perf_stat_config *config,
        int i, ret;
 
        aggr->val = aggr->ena = aggr->run = 0;
-       init_stats(ps->res_stats);
+
+       /*
+        * We calculate counter's data every interval,
+        * and the display code shows ps->res_stats
+        * avg value. We need to zero the stats for
+        * interval mode, otherwise overall avg running
+        * averages will be shown for each interval.
+        */
+       if (config->interval)
+               init_stats(ps->res_stats);
 
        if (counter->per_pkg)
                zero_per_pkg(counter);