Capture the dtrace scripts from Dustin Sallings

Change-Id: I6ecd29edb4d310edebda717b5793ff0ea0ae11ea
Reviewed-on: http://review.couchbase.org/9563
Tested-by: Steve Yen <[email protected]>
Reviewed-by: Steve Yen <[email protected]>

Author: steveyen

scripts/dtrace-profile.d

@@ -0,0 +1,21 @@
+/* Count function invocations.
+ *
+ * usage:
+ *   sudo dtrace -q -s dtrace-profile.d PID
+ */
+
+pid$1:::entry
+{
+  self->t[probefunc] = timestamp;
+}
+
+pid$1:::return
+/ self->t[probefunc] != 0 /
+{
+  @counts[probemod, probefunc] = sum(timestamp - self->t[probefunc]);
+}
+
+tick-5s
+{
+  printa(@counts);
+}

scripts/dtrace-syscalls.d

@@ -0,0 +1,29 @@
+/* Trace all the syscalls invoked during a given C function.
+ *
+ * usage:
+ *   sudo dtrace -q -s dtrace-syscalls.d PID PROBEFUNC
+ *
+ * example:
+ *   sudo dtrace -q -s dtrace-syscalls.d 6666 try_read_command
+ */
+
+pid$1::$2:entry
+{
+  printf("starting %s\n", probefunc);
+  self->in_function = 1;
+  ustack();
+}
+
+pid$1::$2:return
+{
+  printf("ending %s\n", probefunc);
+  self->in_function = 0;
+}
+
+syscall:::
+/ self->in_function != 0 /
+{
+  printf("%s %s %s\n", execname, probefunc, probename);
+}
+
+