1 files changed, 49 insertions, 0 deletions
diff --git a/support-files/dtrace/locktime.d b/support-files/dtrace/locktime.d
new file mode 100644
index 00000000000..c9b509ca61e
--- /dev/null
+++ b/support-files/dtrace/locktime.d
@@ -0,0 +1,49 @@
+#!/usr/sbin/dtrace -s                                                                                                            
+#
+# Shows the time that an individual lock is applied to a database and table
+# Shows the time to achieve the lock, and the time the table was locked
+
+o#pragma D option quiet                                                                                                           
+
+mysql*:::handler-rdlock-start
+{
+   self->rdlockstart = timestamp;
+   this->lockref = strjoin(copyinstr(arg0),strjoin("@",copyinstr(arg1)));
+   self->lockmap[this->lockref] = self->rdlockstart;
+   printf("Start: Lock->Read   %s.%s\n",copyinstr(arg0),copyinstr(arg1));
+}
+
+mysql*:::handler-wrlock-start
+{
+   self->wrlockstart = timestamp;
+   this->lockref = strjoin(copyinstr(arg0),strjoin("@",copyinstr(arg1)));
+   self->lockmap[this->lockref] = self->rdlockstart;
+   printf("Start: Lock->Write  %s.%s\n",copyinstr(arg0),copyinstr(arg1));
+}
+
+mysql*:::handler-unlock-start
+{
+   self->unlockstart = timestamp;
+   this->lockref = strjoin(copyinstr(arg0),strjoin("@",copyinstr(arg1)));
+   printf("Start: Lock->Unlock %s.%s (%d ms lock duration)\n",
+          copyinstr(arg0),copyinstr(arg1),
+          (timestamp - self->lockmap[this->lockref])/1000000);
+}
+
+mysql*:::handler-rdlock-done
+{
+   printf("End:   Lock->Read   %d ms\n",
+          (timestamp - self->rdlockstart)/1000000);
+}
+
+mysql*:::handler-wrlock-done
+{
+   printf("End:   Lock->Write  %d ms\n",
+          (timestamp - self->wrlockstart)/1000000);
+}
+
+mysql*:::handler-unlock-done
+{
+   printf("End:   Lock->Unlock %d ms\n",
+          (timestamp - self->unlockstart)/1000000);
+}