--- /dev/null	2019-01-28 17:47:16.000000000 +0800
+++ new/src/share/vm/jfr/recorder/checkpoint/jfrCheckpointManager.hpp	2019-01-28 17:47:16.000000000 +0800
@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 2016, 2019, 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_JFR_RECORDER_CHECKPOINT_JFRCHECKPOINTMANAGER_HPP
+#define SHARE_VM_JFR_RECORDER_CHECKPOINT_JFRCHECKPOINTMANAGER_HPP
+
+#include "jfr/recorder/storage/jfrBuffer.hpp"
+#include "jfr/recorder/storage/jfrMemorySpace.hpp"
+#include "jfr/recorder/storage/jfrMemorySpaceRetrieval.hpp"
+#include "tracefiles/traceTypes.hpp"
+
+class JfrCheckpointManager;
+class JfrChunkWriter;
+class JfrConstantManager;
+class JfrConstantSerializer;
+class Mutex;
+class Thread;
+
+struct JfrCheckpointEntry {
+  jlong size;
+  jlong start_time;
+  jlong duration;
+  juint flushpoint;
+  juint nof_segments;
+};
+
+typedef JfrMemorySpace<JfrBuffer, JfrMspaceSequentialRetrieval, JfrCheckpointManager> JfrCheckpointMspace;
+
+//
+// Responsible for maintaining checkpoints and by implication constants.
+// A checkpoint is an event that has a payload consisting of constant types.
+// A constant type is a relation, a set of key-value pairs.
+//
+class JfrCheckpointManager : public JfrCHeapObj {
+ public:
+  typedef JfrCheckpointMspace::Type Buffer;
+  typedef JfrCheckpointMspace::List List;
+ private:
+  List _epoch_transition_list;
+  JfrCheckpointMspace* _free_list_mspace;
+  JfrCheckpointMspace* _transient_mspace;
+  Mutex* _lock;
+  JfrConstantManager* _constant_manager;
+  const Thread* _service_thread;
+  JfrChunkWriter& _chunkwriter;
+  bool _checkpoint_epoch_state;
+
+  // mspace callback
+  void register_full(Buffer* t, Thread* thread);
+  void lock();
+  void unlock();
+
+  static Buffer* lease_buffer(Thread* t, size_t size = 0);
+  Buffer* lease_transient(size_t size, Thread* t);
+  static Buffer* flush(Buffer* old, size_t used, size_t requested, Thread* t);
+
+  size_t clear();
+  size_t write();
+  size_t write_epoch_transition_list();
+  size_t write_constant_types();
+  size_t write_safepoint_constant_types();
+  void write_constant_tag_set();
+  void shift_epoch();
+  void synchronize_epoch();
+  bool use_epoch_transition_list(const Thread* t) const;
+
+  JfrCheckpointManager(JfrChunkWriter& cw);
+  ~JfrCheckpointManager();
+
+  static JfrCheckpointManager &instance();
+  static JfrCheckpointManager* create(JfrChunkWriter& cw);
+  bool initialize();
+  static void destroy();
+
+  static bool register_serializer(JfrConstantTypeId id, bool require_safepoint, bool permit_cache, JfrConstantSerializer* serializer);
+
+ public:
+  void register_service_thread(const Thread* t);
+  static void write_constant_tag_set_for_unloaded_classes();
+  static void create_thread_checkpoint(JavaThread* jt);
+  static void write_thread_checkpoint(JavaThread* jt);
+
+  friend class JfrRecorder;
+  friend class JfrRecorderService;
+  friend class JfrCheckpointFlush;
+  friend class JfrCheckpointWriter;
+  friend class JfrConstantSerializer;
+  friend class JfrStackTraceRepository;
+  template <typename, template <typename> class, typename>
+  friend class JfrMemorySpace;
+};
+
+#endif //SHARE_VM_JFR_RECORDER_CHECKPOINT_JFRCHECKPOINTMANAGER_HPP