8079792: GC directory structure cleanup

Reviewed-by: brutisso, stefank, david

hotspot/src/share/vm/gc/parallel/psCompactionManager.hpp

@@ -0,0 +1,243 @@
+/*
+ * Copyright (c) 2005, 2015, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_GC_PARALLEL_PSCOMPACTIONMANAGER_HPP
+#define SHARE_VM_GC_PARALLEL_PSCOMPACTIONMANAGER_HPP
+
+#include "gc/shared/taskqueue.hpp"
+#include "memory/allocation.hpp"
+#include "utilities/stack.hpp"
+
+class MutableSpace;
+class PSOldGen;
+class ParCompactionManager;
+class ObjectStartArray;
+class ParallelCompactData;
+class ParMarkBitMap;
+
+class ParCompactionManager : public CHeapObj<mtGC> {
+  friend class ParallelTaskTerminator;
+  friend class ParMarkBitMap;
+  friend class PSParallelCompact;
+  friend class StealRegionCompactionTask;
+  friend class UpdateAndFillClosure;
+  friend class RefProcTaskExecutor;
+  friend class IdleGCTask;
+
+ public:
+
+// ------------------------  Don't putback if not needed
+  // Actions that the compaction manager should take.
+  enum Action {
+    Update,
+    Copy,
+    UpdateAndCopy,
+    CopyAndUpdate,
+    NotValid
+  };
+// ------------------------  End don't putback if not needed
+
+ private:
+  // 32-bit:  4K * 8 = 32KiB; 64-bit:  8K * 16 = 128KiB
+  #define QUEUE_SIZE (1 << NOT_LP64(12) LP64_ONLY(13))
+  typedef OverflowTaskQueue<ObjArrayTask, mtGC, QUEUE_SIZE> ObjArrayTaskQueue;
+  typedef GenericTaskQueueSet<ObjArrayTaskQueue, mtGC>      ObjArrayTaskQueueSet;
+  #undef QUEUE_SIZE
+
+  static ParCompactionManager** _manager_array;
+  static OopTaskQueueSet*       _stack_array;
+  static ObjArrayTaskQueueSet*  _objarray_queues;
+  static ObjectStartArray*      _start_array;
+  static RegionTaskQueueSet*    _region_array;
+  static PSOldGen*              _old_gen;
+
+private:
+  OverflowTaskQueue<oop, mtGC>        _marking_stack;
+  ObjArrayTaskQueue             _objarray_stack;
+
+  // Is there a way to reuse the _marking_stack for the
+  // saving empty regions?  For now just create a different
+  // type of TaskQueue.
+  RegionTaskQueue*             _region_stack;
+
+  static RegionTaskQueue**     _region_list;
+  // Index in _region_list for current _region_stack.
+  uint _region_stack_index;
+
+  // Indexes of recycled region stacks/overflow stacks
+  // Stacks of regions to be compacted are embedded in the tasks doing
+  // the compaction.  A thread that executes the task extracts the
+  // region stack and drains it.  These threads keep these region
+  // stacks for use during compaction task stealing.  If a thread
+  // gets a second draining task, it pushed its current region stack
+  // index into the array _recycled_stack_index and gets a new
+  // region stack from the task.  A thread that is executing a
+  // compaction stealing task without ever having executing a
+  // draining task, will get a region stack from _recycled_stack_index.
+  //
+  // Array of indexes into the array of region stacks.
+  static uint*                    _recycled_stack_index;
+  // The index into _recycled_stack_index of the last region stack index
+  // pushed.  If -1, there are no entries into _recycled_stack_index.
+  static int                      _recycled_top;
+  // The index into _recycled_stack_index of the last region stack index
+  // popped.  If -1, there has not been any entry popped.
+  static int                      _recycled_bottom;
+
+  static ParMarkBitMap* _mark_bitmap;
+
+  Action _action;
+
+  static PSOldGen* old_gen()             { return _old_gen; }
+  static ObjectStartArray* start_array() { return _start_array; }
+  static OopTaskQueueSet* stack_array()  { return _stack_array; }
+
+  static void initialize(ParMarkBitMap* mbm);
+
+ protected:
+  // Array of tasks.  Needed by the ParallelTaskTerminator.
+  static RegionTaskQueueSet* region_array()      { return _region_array; }
+  OverflowTaskQueue<oop, mtGC>*  marking_stack()       { return &_marking_stack; }
+
+  // Pushes onto the marking stack.  If the marking stack is full,
+  // pushes onto the overflow stack.
+  void stack_push(oop obj);
+  // Do not implement an equivalent stack_pop.  Deal with the
+  // marking stack and overflow stack directly.
+
+ public:
+  Action action() { return _action; }
+  void set_action(Action v) { _action = v; }
+
+  RegionTaskQueue* region_stack()                { return _region_stack; }
+  void set_region_stack(RegionTaskQueue* v)       { _region_stack = v; }
+
+  inline static ParCompactionManager* manager_array(int index);
+
+  inline static RegionTaskQueue* region_list(int index) {
+    return _region_list[index];
+  }
+
+  uint region_stack_index() { return _region_stack_index; }
+  void set_region_stack_index(uint v) { _region_stack_index = v; }
+
+  // Pop and push unique reusable stack index
+  static int pop_recycled_stack_index();
+  static void push_recycled_stack_index(uint v);
+  static void reset_recycled_stack_index() {
+    _recycled_bottom = _recycled_top = -1;
+  }
+
+  ParCompactionManager();
+  ~ParCompactionManager();
+
+  // Pushes onto the region stack at the given index.  If the
+  // region stack is full,
+  // pushes onto the region overflow stack.
+  static void region_list_push(uint stack_index, size_t region_index);
+  static void verify_region_list_empty(uint stack_index);
+  ParMarkBitMap* mark_bitmap() { return _mark_bitmap; }
+
+  // void drain_stacks();
+
+  bool should_update();
+  bool should_copy();
+
+  // Save for later processing.  Must not fail.
+  inline void push(oop obj);
+  inline void push_objarray(oop objarray, size_t index);
+  inline void push_region(size_t index);
+
+  // Check mark and maybe push on marking stack.
+  template <typename T> inline void mark_and_push(T* p);
+
+  inline void follow_klass(Klass* klass);
+
+  void follow_class_loader(ClassLoaderData* klass);
+
+  // Access function for compaction managers
+  static ParCompactionManager* gc_thread_compaction_manager(int index);
+
+  static bool steal(int queue_num, int* seed, oop& t);
+  static bool steal_objarray(int queue_num, int* seed, ObjArrayTask& t);
+  static bool steal(int queue_num, int* seed, size_t& region);
+
+  // Process tasks remaining on any marking stack
+  void follow_marking_stacks();
+  inline bool marking_stacks_empty() const;
+
+  // Process tasks remaining on any stack
+  void drain_region_stacks();
+
+  void follow_contents(oop obj);
+  void follow_contents(objArrayOop array, int index);
+
+  void update_contents(oop obj);
+
+  class MarkAndPushClosure: public ExtendedOopClosure {
+   private:
+    ParCompactionManager* _compaction_manager;
+   public:
+    MarkAndPushClosure(ParCompactionManager* cm) : _compaction_manager(cm) { }
+
+    template <typename T> void do_oop_nv(T* p);
+    virtual void do_oop(oop* p);
+    virtual void do_oop(narrowOop* p);
+
+    // This closure provides its own oop verification code.
+    debug_only(virtual bool should_verify_oops() { return false; })
+  };
+
+  class FollowStackClosure: public VoidClosure {
+   private:
+    ParCompactionManager* _compaction_manager;
+   public:
+    FollowStackClosure(ParCompactionManager* cm) : _compaction_manager(cm) { }
+    virtual void do_void();
+  };
+
+  // The one and only place to start following the classes.
+  // Should only be applied to the ClassLoaderData klasses list.
+  class FollowKlassClosure : public KlassClosure {
+   private:
+    MarkAndPushClosure* _mark_and_push_closure;
+   public:
+    FollowKlassClosure(MarkAndPushClosure* mark_and_push_closure) :
+        _mark_and_push_closure(mark_and_push_closure) { }
+    void do_klass(Klass* klass);
+  };
+};
+
+inline ParCompactionManager* ParCompactionManager::manager_array(int index) {
+  assert(_manager_array != NULL, "access of NULL manager_array");
+  assert(index >= 0 && index <= (int)ParallelGCThreads,
+    "out of range manager_array access");
+  return _manager_array[index];
+}
+
+bool ParCompactionManager::marking_stacks_empty() const {
+  return _marking_stack.is_empty() && _objarray_stack.is_empty();
+}
+
+#endif // SHARE_VM_GC_PARALLEL_PSCOMPACTIONMANAGER_HPP