8323993: Serial: Refactor gc_prologue and gc_epilogue

Reviewed-by: stefank, ehelin

src/hotspot/share/gc/serial/defNewGeneration.hpp

@@ -226,7 +226,7 @@ class DefNewGeneration: public Generation {
 
   HeapWord* par_allocate(size_t word_size, bool is_tlab);
 
-  virtual void gc_epilogue(bool full);
+  void gc_epilogue(bool full);
 
   // Save the tops for eden, from, and to
   virtual void record_spaces_top();

src/hotspot/share/gc/serial/generation.hpp

@@ -224,14 +224,6 @@ class Generation: public CHeapObj<mtGC> {
   // still unsuccessful, return "null".
   virtual HeapWord* expand_and_allocate(size_t word_size, bool is_tlab) = 0;
 
-  // Some generations may require some cleanup or preparation actions before
-  // allowing a collection.  The default is to do nothing.
-  virtual void gc_prologue(bool full) {}
-
-  // Some generations may require some cleanup actions after a collection.
-  // The default is to do nothing.
-  virtual void gc_epilogue(bool full) {}
-
   // Save the high water marks for the used space in a generation.
   virtual void record_spaces_top() {}
 

src/hotspot/share/gc/serial/serialHeap.cpp

@@ -1052,35 +1052,13 @@ void SerialHeap::print_heap_change(const PreGenGCValues& pre_gc_values) const {
   MetaspaceUtils::print_metaspace_change(pre_gc_values.metaspace_sizes());
 }
 
-class GenGCPrologueClosure: public SerialHeap::GenClosure {
- private:
-  bool _full;
- public:
-  void do_generation(Generation* gen) {
-    gen->gc_prologue(_full);
-  }
-  GenGCPrologueClosure(bool full) : _full(full) {};
-};
-
 void SerialHeap::gc_prologue(bool full) {
   assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer");
 
   // Fill TLAB's and such
   ensure_parsability(true);   // retire TLABs
 
-  // Walk generations
-  GenGCPrologueClosure blk(full);
-  generation_iterate(&blk, false);  // not old-to-young.
-};
-
-class GenGCEpilogueClosure: public SerialHeap::GenClosure {
- private:
-  bool _full;
- public:
-  void do_generation(Generation* gen) {
-    gen->gc_epilogue(_full);
-  }
-  GenGCEpilogueClosure(bool full) : _full(full) {};
+  _old_gen->gc_prologue();
 };
 
 void SerialHeap::gc_epilogue(bool full) {
@@ -1090,8 +1068,8 @@ void SerialHeap::gc_epilogue(bool full) {
 
   resize_all_tlabs();
 
-  GenGCEpilogueClosure blk(full);
-  generation_iterate(&blk, false);  // not old-to-young.
+  _young_gen->gc_epilogue(full);
+  _old_gen->gc_epilogue();
 
   MetaspaceCounters::update_performance_counters();
 };

src/hotspot/share/gc/serial/tenuredGeneration.cpp

@@ -331,7 +331,7 @@ TenuredGeneration::TenuredGeneration(ReservedSpace rs,
                                        _the_space, _gen_counters);
 }
 
-void TenuredGeneration::gc_prologue(bool full) {
+void TenuredGeneration::gc_prologue() {
   _capacity_at_prologue = capacity();
   _used_at_prologue = used();
 }
@@ -485,7 +485,7 @@ bool TenuredGeneration::no_allocs_since_save_marks() {
   return _the_space->saved_mark_at_top();
 }
 
-void TenuredGeneration::gc_epilogue(bool full) {
+void TenuredGeneration::gc_epilogue() {
   // update the generation and space performance counters
   update_counters();
   if (ZapUnusedHeapArea) {

src/hotspot/share/gc/serial/tenuredGeneration.hpp

@@ -140,8 +140,8 @@ class TenuredGeneration: public Generation {
 
   HeapWord* expand_and_allocate(size_t size, bool is_tlab);
 
-  virtual void gc_prologue(bool full);
-  virtual void gc_epilogue(bool full);
+  void gc_prologue();
+  void gc_epilogue();
 
   bool should_collect(bool   full,
                       size_t word_size,