src/hotspot/share/runtime/globals.hpp

@@ -123,11 +123,11 @@
                                                                              \
    product(bool, UseCompressedOops, false,                                   \
            "Use 32-bit object references in 64-bit VM. "                     \
            "lp64_product means flag is always constant in 32 bit VM")        \
                                                                              \
-   product(bool, UseCompressedClassPointers, false,                          \
+   product(bool, UseCompressedClassPointers, true,                           \
            "Use 32-bit class pointers in 64-bit VM. "                        \
            "lp64_product means flag is always constant in 32 bit VM")        \
                                                                              \
    product(intx, ObjectAlignmentInBytes, 8,                                  \
            "Default object alignment in bytes, 8 is minimum")                \

@@ -2041,12 +2041,18 @@
    develop(bool, VerifyCrossModifyFence,                                     \
            false AARCH64_ONLY(DEBUG_ONLY(||true)),                           \
               "Mark all threads after a safepoint, and clear on a modify "   \
               "fence. Add cleanliness checks.")                              \
                                                                              \
-   develop(bool, TraceOptimizedUpcallStubs, false,                              \
-                 "Trace optimized upcall stub generation")                      \
+   product(bool, HeapObjectStats, false, DIAGNOSTIC,                         \
+              "Enable gathering of heap object statistics")                  \
+                                                                             \
+   product(size_t, HeapObjectStatsSamplingInterval, 500, DIAGNOSTIC,         \
+              "Heap object statistics sampling interval (ms)")               \
+                                                                             \
+   develop(bool, TraceOptimizedUpcallStubs, false,                           \
+                 "Trace optimized upcall stub generation")                   \
  
  // end of RUNTIME_FLAGS
  
  DECLARE_FLAGS(LP64_RUNTIME_FLAGS)
  DECLARE_ARCH_FLAGS(ARCH_FLAGS)