[tip:perf/core] perf stat: Update walltime_nsecs_stats in interval mode

[tip-bot for Andi Kleen <tipbot@zytor.com>]

Commit-ID:  b90f1333ef08d2a497ae239798868b046f4e3a97
Gitweb:     http://git.kernel.org/tip/b90f1333ef08d2a497ae239798868b046f4e3a97
Author:     Andi Kleen <ak@linux.intel.com>
AuthorDate: Thu, 31 Aug 2017 12:40:36 -0700
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 13 Sep 2017 09:49:14 -0300

perf stat: Update walltime_nsecs_stats in interval mode

Some metrics (like GFLOPs) need walltime_nsecs_stats for each interval.
Compute it for each interval instead of only at the end.

Pointed out by Jiri.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20170831194036.30146-12-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/builtin-stat.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 855890e..88f1d5f 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -415,6 +415,8 @@ static void process_interval(void)
 			pr_err("failed to write stat round event\n");
 	}
 
+	init_stats(&walltime_nsecs_stats);
+	update_stats(&walltime_nsecs_stats, stat_config.interval * 1000000);
 	print_counters(&rs, 0, NULL);
 }