[PATCH 1/4] tools lib traceevent: Fix time stamp rounding issue

[Steven Rostedt]

From: "Chaos.Chen" <rainboy1215@xxxxxxxxx>

When rounding to microseconds, if the timestamp subsecond is between
.999999500 and .999999999, it is rounded to .1000000, when it should instead
increment the second counter due to the overflow.

For example, if the timestamp is 1234.999999501 instead of seeing:

 1235.000000

we see

 1234.1000000

Signed-off-by: Chaos.Chen <rainboy1215@xxxxxxxxx>
[ fixed incrementing "secs" instead of decrementing it ]
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
 tools/lib/traceevent/event-parse.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index c3bd294a63d1..a6f1ce779e05 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -5387,6 +5387,11 @@ void pevent_print_event(struct pevent *pevent, struct trace_seq *s,
 			p = 9;
 		} else {
 			usecs = (nsecs + 500) / NSECS_PER_USEC;
+			/* To avoid usecs larger than 1 sec */
+			if (usecs >= 1000000) {
+				usecs -= 1000000;
+				secs++;
+			}
 			p = 6;
 		}
 
-- 
2.6.4