[PATCH v5 06/11] trace: add current timestamp to all trace output

[Karsten Blees <karsten.blees@gmail.com>]

This is useful to tell apart trace output of separate test runs.

It can also be used for basic, coarse-grained performance analysis. Note
that the accuracy is tainted by writing to the trace file, and you have to
calculate the deltas yourself (which is next to impossible if multiple
threads or processes are involved).

Signed-off-by: Karsten Blees <blees@dcon.de>
---
 trace.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/trace.c b/trace.c
index c920429..5a3393a 100644
--- a/trace.c
+++ b/trace.c
@@ -79,12 +79,21 @@ static void do_trace_print(const char *key, const struct strbuf *buf)
 
 static int prepare_trace_line(const char *key, struct strbuf *buf)
 {
+	struct timeval tv;
+	struct tm tm;
+	time_t secs;
+
 	if (!trace_want(key))
 		return 0;
 
 	set_try_to_free_routine(NULL);	/* is never reset */
 
-	/* add line prefix here */
+	/* print current timestamp */
+	gettimeofday(&tv, NULL);
+	secs = tv.tv_sec;
+	localtime_r(&secs, &tm);
+	strbuf_addf(buf, "%02d:%02d:%02d.%06ld ", tm.tm_hour, tm.tm_min,
+		    tm.tm_sec, tv.tv_usec);
 
 	return 1;
 }
-- 
1.9.2.msysgit.0.501.gaeecf09

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