--- old/src/share/vm/memory/generation.cpp	2013-06-05 10:56:46.000000000 +0200
+++ new/src/share/vm/memory/generation.cpp	2013-06-05 10:56:45.000000000 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -23,6 +23,8 @@
  */
 
 #include "precompiled.hpp"
+#include "gc_implementation/shared/gcTimer.hpp"
+#include "gc_implementation/shared/gcTrace.hpp"
 #include "gc_implementation/shared/spaceDecorator.hpp"
 #include "gc_interface/collectedHeap.inline.hpp"
 #include "memory/allocation.inline.hpp"
@@ -624,12 +626,26 @@
                                            bool   clear_all_soft_refs,
                                            size_t size,
                                            bool   is_tlab) {
+  GenCollectedHeap* gch = GenCollectedHeap::heap();
+
   SpecializationStats::clear();
   // Temporarily expand the span of our ref processor, so
   // refs discovery is over the entire heap, not just this generation
   ReferenceProcessorSpanMutator
-    x(ref_processor(), GenCollectedHeap::heap()->reserved_region());
+    x(ref_processor(), gch->reserved_region());
+
+  STWGCTimer* gc_timer = GenMarkSweep::gc_timer();
+  gc_timer->register_gc_start(os::elapsed_counter());
+
+  SerialOldTracer* gc_tracer = GenMarkSweep::gc_tracer();
+  gc_tracer->report_gc_start(gch->gc_cause(), gc_timer->gc_start());
+
   GenMarkSweep::invoke_at_safepoint(_level, ref_processor(), clear_all_soft_refs);
+
+  gc_timer->register_gc_end(os::elapsed_counter());
+
+  gc_tracer->report_gc_end(os::elapsed_counter(), gc_timer->time_partitions());
+
   SpecializationStats::print();
 }