From b2165c26d73fd3ba8fc1cf33745b5732ea25e47f Mon Sep 17 00:00:00 2001
From: startx2017 <vradu.startx@yandex.com>
Date: Mon, 9 Oct 2017 08:10:06 -0400
Subject: added a tool to measure time spent in various functions

---
 src/include/common.h |  2 ++
 src/lib/common.c     | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/src/include/common.h b/src/include/common.h
index 4c517e427..80f55803d 100644
--- a/src/include/common.h
+++ b/src/include/common.h
@@ -124,6 +124,8 @@ static inline unsigned long long getticks(void) {
 #endif
 }
 
+void timetrace_start(void);
+float timetrace_end(void);
 int join_namespace(pid_t pid, char *type);
 int name2pid(const char *name, pid_t *pid);
 char *pid_proc_comm(const pid_t pid);
diff --git a/src/lib/common.c b/src/lib/common.c
index b44563733..3d7fc5ffa 100644
--- a/src/lib/common.c
+++ b/src/lib/common.c
@@ -282,3 +282,42 @@ int pid_hidepid(void) {
 	fclose(fp);
 	return 0;
 }
+
+//**************************
+// time trace based on getticks function
+//**************************
+static int tt_not_implemented = 0; // not implemented for the current architecture
+static unsigned long long tt_1ms = 0;
+static unsigned long long tt = 0;	// start time
+
+void timetrace_start(void) {
+	if (tt_not_implemented)
+		return;
+	unsigned long long t1 = getticks();
+	if (t1 == 0) {
+		tt_not_implemented = 1;
+		return;
+	}
+
+	if (tt_1ms == 0) {
+		usleep(1000);	// sleep 1 ms
+		unsigned long long t2 = getticks();
+		tt_1ms = t2 - t1;
+		if (tt_1ms == 0) {
+			tt_not_implemented = 1;
+			return;
+		}
+	}
+
+	tt = getticks();
+}
+
+float timetrace_end(void) {
+	if (tt_not_implemented)
+		return 0;
+
+	unsigned long long delta = getticks() - tt;
+	assert(tt_1ms);
+
+	return (float) delta / (float) tt_1ms;
+}
-- 
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