linux-kernel - [PATCH] tools/lib/traceevent: Round up in tep_print

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Date:   Thu, 19 Sep 2019 16:51:19 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Linux Trace Devel <linux-trace-devel@...r.kernel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Tzvetomir Stoyanov <tstoyanov@...are.com>
Subject: [PATCH] tools/lib/traceevent: Round up in tep_print_event() time
 precision


From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>


When testing the output of the old trace-cmd compared to the one that uses
the updated tep_print_event() logic, it was different in that the time stamp
precision in the old format would round up to the nearest precision, where
as the new logic truncates. Bring back the old method of rounding up.

Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
 tools/lib/traceevent/event-parse.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index bb22238debfe..eb84fbb49e4d 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -5517,8 +5517,10 @@ static void print_event_time(struct tep_handle *tep, struct trace_seq *s,
 	if (divstr && isdigit(*(divstr + 1)))
 		div = atoi(divstr + 1);
 	time = record->ts;
-	if (div)
+	if (div) {
+		time += div / 2;
 		time /= div;
+	}
 	pr = prec;
 	while (pr--)
 		p10 *= 10;
-- 
2.20.1