linux-kernel - [tip:perf/urgent] perf time-utils: Add utility function to print time stamps in nanoseconds

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Date:   Fri, 22 Mar 2019 15:00:36 -0700
From:   tip-bot for Andi Kleen <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     namhyung@...nel.org, hpa@...or.com, tglx@...utronix.de,
        acme@...hat.com, linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        mingo@...nel.org, jolsa@...nel.org
Subject: [tip:perf/urgent] perf time-utils: Add utility function to print
 time stamps in nanoseconds

Commit-ID:  f8c856cb2c947f4fad0a2dff5e95cdcddb801303
Gitweb:     https://git.kernel.org/tip/f8c856cb2c947f4fad0a2dff5e95cdcddb801303
Author:     Andi Kleen <ak@...ux.intel.com>
AuthorDate: Tue, 5 Mar 2019 06:47:53 -0800
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 11 Mar 2019 11:56:02 -0300

perf time-utils: Add utility function to print time stamps in nanoseconds

Add a utility function to print nanosecond timestamps.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Link: http://lkml.kernel.org/r/20190305144758.12397-11-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/time-utils.c | 8 ++++++++
 tools/perf/util/time-utils.h | 1 +
 2 files changed, 9 insertions(+)

diff --git a/tools/perf/util/time-utils.c b/tools/perf/util/time-utils.c
index 0f53baec660e..20663a460df3 100644
--- a/tools/perf/util/time-utils.c
+++ b/tools/perf/util/time-utils.c
@@ -453,6 +453,14 @@ int timestamp__scnprintf_usec(u64 timestamp, char *buf, size_t sz)
 	return scnprintf(buf, sz, "%"PRIu64".%06"PRIu64, sec, usec);
 }
 
+int timestamp__scnprintf_nsec(u64 timestamp, char *buf, size_t sz)
+{
+	u64 sec  = timestamp / NSEC_PER_SEC,
+	    nsec = timestamp % NSEC_PER_SEC;
+
+	return scnprintf(buf, sz, "%" PRIu64 ".%09" PRIu64, sec, nsec);
+}
+
 int fetch_current_timestamp(char *buf, size_t sz)
 {
 	struct timeval tv;
diff --git a/tools/perf/util/time-utils.h b/tools/perf/util/time-utils.h
index b923de44e36f..72a42ea1d513 100644
--- a/tools/perf/util/time-utils.h
+++ b/tools/perf/util/time-utils.h
@@ -30,6 +30,7 @@ int perf_time__parse_for_ranges(const char *str, struct perf_session *session,
 				int *range_size, int *range_num);
 
 int timestamp__scnprintf_usec(u64 timestamp, char *buf, size_t sz);
+int timestamp__scnprintf_nsec(u64 timestamp, char *buf, size_t sz);
 
 int fetch_current_timestamp(char *buf, size_t sz);