--- old/src/share/vm/gc/g1/g1MarkSweep.cpp	2016-03-14 14:53:57.870852251 +0100
+++ new/src/share/vm/gc/g1/g1MarkSweep.cpp	2016-03-14 14:53:57.754848322 +0100
@@ -154,17 +154,24 @@
   // This is the point where the entire marking should have completed.
   assert(GenMarkSweep::_marking_stack.is_empty(), "Marking should have completed");
 
-  // Unload classes and purge the SystemDictionary.
-  bool purged_class = SystemDictionary::do_unloading(&GenMarkSweep::is_alive);
+  {
+    GCTraceTime(Debug, gc) tm_m("Class Unloading", gc_timer());
 
-  // Unload nmethods.
-  CodeCache::do_unloading(&GenMarkSweep::is_alive, purged_class);
+    // Unload classes and purge the SystemDictionary.
+    bool purged_class = SystemDictionary::do_unloading(&GenMarkSweep::is_alive);
 
-  // Prune dead klasses from subklass/sibling/implementor lists.
-  Klass::clean_weak_klass_links(&GenMarkSweep::is_alive);
+    // Unload nmethods.
+    CodeCache::do_unloading(&GenMarkSweep::is_alive, purged_class);
 
-  // Delete entries for dead interned string and clean up unreferenced symbols in symbol table.
-  g1h->unlink_string_and_symbol_table(&GenMarkSweep::is_alive);
+    // Prune dead klasses from subklass/sibling/implementor lists.
+    Klass::clean_weak_klass_links(&GenMarkSweep::is_alive);
+  }
+
+  {
+    GCTraceTime(Debug, gc) t("Scrub String and Symbol Tables", gc_timer());
+    // Delete entries for dead interned string and clean up unreferenced symbols in symbol table.
+    g1h->unlink_string_and_symbol_table(&GenMarkSweep::is_alive);
+  }
 
   if (VerifyDuringGC) {
     HandleMark hm;  // handle scope
--- old/src/share/vm/gc/parallel/psMarkSweep.cpp	2016-03-14 14:53:58.146861598 +0100
+++ new/src/share/vm/gc/parallel/psMarkSweep.cpp	2016-03-14 14:53:57.974855773 +0100
@@ -533,20 +533,31 @@
   // This is the point where the entire marking should have completed.
   assert(_marking_stack.is_empty(), "Marking should have completed");
 
-  // Unload classes and purge the SystemDictionary.
-  bool purged_class = SystemDictionary::do_unloading(is_alive_closure());
+  {
+    GCTraceTime(Debug, gc) t("Class Unloading", _gc_timer);
 
-  // Unload nmethods.
-  CodeCache::do_unloading(is_alive_closure(), purged_class);
+    // Unload classes and purge the SystemDictionary.
+    bool purged_class = SystemDictionary::do_unloading(is_alive_closure());
 
-  // Prune dead klasses from subklass/sibling/implementor lists.
-  Klass::clean_weak_klass_links(is_alive_closure());
+    // Unload nmethods.
+    CodeCache::do_unloading(is_alive_closure(), purged_class);
 
-  // Delete entries for dead interned strings.
-  StringTable::unlink(is_alive_closure());
+    // Prune dead klasses from subklass/sibling/implementor lists.
+    Klass::clean_weak_klass_links(is_alive_closure());
+  }
+
+  {
+    GCTraceTime(Debug, gc) t("Scrub String Table", _gc_timer);
+    // Delete entries for dead interned strings.
+    StringTable::unlink(is_alive_closure());
+  }
+
+  {
+    GCTraceTime(Debug, gc) t("Scrub Symbol Table", _gc_timer);
+    // Clean up unreferenced symbols in symbol table.
+    SymbolTable::unlink();
+  }
 
-  // Clean up unreferenced symbols in symbol table.
-  SymbolTable::unlink();
   _gc_tracer->report_object_count_after_gc(is_alive_closure());
 }
 
--- old/src/share/vm/gc/parallel/psParallelCompact.cpp	2016-03-14 14:53:58.418870809 +0100
+++ new/src/share/vm/gc/parallel/psParallelCompact.cpp	2016-03-14 14:53:58.262865526 +0100
@@ -2103,25 +2103,34 @@
     gc_tracer->report_gc_reference_stats(stats);
   }
 
-  GCTraceTime(Trace, gc) tm_m("Class Unloading", &_gc_timer);
-
   // This is the point where the entire marking should have completed.
   assert(cm->marking_stacks_empty(), "Marking should have completed");
 
-  // Follow system dictionary roots and unload classes.
-  bool purged_class = SystemDictionary::do_unloading(is_alive_closure());
+  {
+    GCTraceTime(Debug, gc) tm_m("Class Unloading", &_gc_timer);
+
+    // Follow system dictionary roots and unload classes.
+    bool purged_class = SystemDictionary::do_unloading(is_alive_closure());
+
+    // Unload nmethods.
+    CodeCache::do_unloading(is_alive_closure(), purged_class);
 
-  // Unload nmethods.
-  CodeCache::do_unloading(is_alive_closure(), purged_class);
+    // Prune dead klasses from subklass/sibling/implementor lists.
+    Klass::clean_weak_klass_links(is_alive_closure());
+  }
 
-  // Prune dead klasses from subklass/sibling/implementor lists.
-  Klass::clean_weak_klass_links(is_alive_closure());
+  {
+    GCTraceTime(Debug, gc) t("Scrub String Table", &_gc_timer);
+    // Delete entries for dead interned strings.
+    StringTable::unlink(is_alive_closure());
+  }
 
-  // Delete entries for dead interned strings.
-  StringTable::unlink(is_alive_closure());
+  {
+    GCTraceTime(Debug, gc) t("Scrub Symbol Table", &_gc_timer);
+    // Clean up unreferenced symbols in symbol table.
+    SymbolTable::unlink();
+  }
 
-  // Clean up unreferenced symbols in symbol table.
-  SymbolTable::unlink();
   _gc_tracer.report_object_count_after_gc(is_alive_closure());
 }
 
--- old/src/share/vm/gc/serial/genMarkSweep.cpp	2016-03-14 14:53:58.742881781 +0100
+++ new/src/share/vm/gc/serial/genMarkSweep.cpp	2016-03-14 14:53:58.606877176 +0100
@@ -218,20 +218,30 @@
   // This is the point where the entire marking should have completed.
   assert(_marking_stack.is_empty(), "Marking should have completed");
 
-  // Unload classes and purge the SystemDictionary.
-  bool purged_class = SystemDictionary::do_unloading(&is_alive);
+  {
+    GCTraceTime(Debug, gc) tm_m("Class Unloading", gc_timer());
 
-  // Unload nmethods.
-  CodeCache::do_unloading(&is_alive, purged_class);
+    // Unload classes and purge the SystemDictionary.
+    bool purged_class = SystemDictionary::do_unloading(&is_alive);
 
-  // Prune dead klasses from subklass/sibling/implementor lists.
-  Klass::clean_weak_klass_links(&is_alive);
+    // Unload nmethods.
+    CodeCache::do_unloading(&is_alive, purged_class);
 
-  // Delete entries for dead interned strings.
-  StringTable::unlink(&is_alive);
-
-  // Clean up unreferenced symbols in symbol table.
-  SymbolTable::unlink();
+    // Prune dead klasses from subklass/sibling/implementor lists.
+    Klass::clean_weak_klass_links(&is_alive);
+  }
+
+  {
+    GCTraceTime(Debug, gc) t("Scrub String Table", gc_timer());
+    // Delete entries for dead interned strings.
+    StringTable::unlink(&is_alive);
+  }
+
+  {
+    GCTraceTime(Debug, gc) t("Scrub Symbol Table", gc_timer());
+    // Clean up unreferenced symbols in symbol table.
+    SymbolTable::unlink();
+  }
 
   gc_tracer()->report_object_count_after_gc(&is_alive);
 }