[tip: perf/core] perf stat: Zero all the 'ena' and 'run' array slot stats for interval mode

[tip-bot2 for Jin Yao]

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     0e0bf1ea1147fcf74eab19c2d3c853cc3740a72f
Gitweb:        https://git.kernel.org/tip/0e0bf1ea1147fcf74eab19c2d3c853cc3740a72f
Author:        Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
AuthorDate:    Thu, 09 Apr 2020 15:07:55 +08:00
Committer:     Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitterDate: Wed, 22 Apr 2020 15:51:01 -03:00

perf stat: Zero all the 'ena' and 'run' array slot stats for interval mode

As the code comments in perf_stat_process_counter() say, 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.

But the current code only zeros the res_stats[0], it doesn't zero the
res_stats[1] and res_stats[2], which are for ena and run of counter.

This patch zeros the whole res_stats[] for interval mode.

Fixes: 51fd2df1e882 ("perf stat: Fix interval output values")
Signed-off-by: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Jin Yao <yao.jin@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lore.kernel.org/lkml/20200409070755.17261-1-yao.jin@xxxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/stat.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
index 5f26137..242476e 100644
--- a/tools/perf/util/stat.c
+++ b/tools/perf/util/stat.c
@@ -368,8 +368,10 @@ int perf_stat_process_counter(struct perf_stat_config *config,
 	 * interval mode, otherwise overall avg running
 	 * averages will be shown for each interval.
 	 */
-	if (config->interval)
-		init_stats(ps->res_stats);
+	if (config->interval) {
+		for (i = 0; i < 3; i++)
+			init_stats(&ps->res_stats[i]);
+	}
 
 	if (counter->per_pkg)
 		zero_per_pkg(counter);