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Subject[PATCH 04/30] perf time-utils: Add utility function to print time stamps in nanoseconds
Date
From: Andi Kleen <ak@linux.intel.com>

Add a utility function to print nanosecond timestamps.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/20190305144758.12397-11-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.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);

--
2.20.1
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