added a tool to measure time spent in various functions

1 files changed, 39 insertions, 0 deletions

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;
+}