1 files changed, 35 insertions, 0 deletions
diff --git a/examples/small_demos/prof.stp b/examples/small_demos/prof.stp
new file mode 100755
index 00000000..986be65e
--- /dev/null
+++ b/examples/small_demos/prof.stp
@@ -0,0 +1,35 @@
+#!/usr/bin/env stap
+
+# This is an example of profiling a specific command or pid.
+# It works by recording the time when a system call is entered
+# exited. 
+
+# Usage: prof.stp -c "top -n5"
+# Will start up "top" and after 5 iterations, will exit.
+#
+# Usage: prof.stp -x 3323
+# Will profile pid 3323 until it ^c is hit.
+#
+
+probe kernel.function("sys_*") {
+	if (target() == tid())
+		calltime[tid()] = gettimeofday_us()
+}
+
+probe kernel.function("sys_*").return {
+	if (target() != tid())  next
+	now = gettimeofday_us()
+	c = calltime[tid()]
+	if (!c) next
+	ttime[probefunc()] <<< now - c
+	delete calltime[tid()]
+}
+
+probe end {
+	printf("\n")
+	foreach (x in ttime)
+		printf("%-20s\tcalls:%6d\tavg time (ms):%5d\ttotal(ms):%7d\n", 
+			x, @count(ttime[x]), @avg(ttime[x]), @sum(ttime[x]))
+}
+
+global calltime, ttime