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tools lib traceevent: Fix time stamp rounding issue

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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@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20160209204236.824426460@goodmis.org
[ fixed incrementing "secs" instead of decrementing it ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Chaos.Chen 2016-02-09 15:40:14 -05:00 committed by Arnaldo Carvalho de Melo
parent 979ac257b0
commit 21a3010045
1 changed files with 5 additions and 0 deletions
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5
tools/lib/traceevent/event-parse.c
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@ -5429,6 +5429,11 @@ void pevent_print_event_time(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;
}