--- a/hotspot/src/share/vm/runtime/globals.hpp	Wed Jun 18 12:39:57 2014 -0700
+++ b/hotspot/src/share/vm/runtime/globals.hpp	Thu Jun 19 13:31:14 2014 +0200
@@ -2299,6 +2299,9 @@
   manageable(bool, PrintGCTimeStamps, false,                                \
           "Print timestamps at garbage collection")                         \
                                                                             \
+  manageable(bool, PrintGCID, true,                                         \
+          "Print an identifier for each garbage collection")                \
+                                                                            \
   product(bool, PrintGCTaskTimeStamps, false,                               \
           "Print timestamps for individual gc worker thread tasks")         \
                                                                             \