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authorChaos.Chen <rainboy1215@gmail.com>2016-02-09 15:40:14 -0500
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-03-03 11:10:37 -0300
commit21a30100453516004905d4d5f0806ebaffa95131 (patch)
tree81200b0f539f94c8f71efe192cb6e41176d20743 /tools/lib
parent979ac257b00c53aacec3eacf86142e8c00bee889 (diff)
downloadlinux-21a30100453516004905d4d5f0806ebaffa95131.tar.bz2
tools lib traceevent: Fix time stamp rounding issue
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>
Diffstat (limited to 'tools/lib')
-rw-r--r--tools/lib/traceevent/event-parse.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index 9a1e48afcf89..ce59f4891fa2 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -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;
}