--- /dev/null	2019-02-13 16:01:02.292000000 +0300
+++ new/src/share/vm/jfr/leakprofiler/sampling/sampleList.hpp	2019-02-15 19:03:07.585780869 +0300
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2017, 2018, 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_LEAKPROFILER_SAMPLING_SAMPLELIST_HPP
+#define SHARE_VM_JFR_LEAKPROFILER_SAMPLING_SAMPLELIST_HPP
+#include "jfr/utilities/jfrAllocation.hpp"
+#include "jfr/utilities/jfrDoublyLinkedList.hpp"
+
+class ObjectSample;
+
+class SampleList : public JfrCHeapObj {
+  typedef JfrDoublyLinkedList<ObjectSample> List;
+ private:
+  List _free_list;
+  List _in_use_list;
+  const ObjectSample* _last_resolved;
+  mutable size_t _allocated;
+  const size_t _limit;
+  const size_t _cache_size;
+
+  void populate_cache();
+  ObjectSample* newSample() const;
+  void link(ObjectSample* sample);
+  void unlink(ObjectSample* sample);
+  void deallocate_samples(List& list);
+  void reset(ObjectSample* sample);
+
+ public:
+  SampleList(size_t limit, size_t cache_size = 0);
+  ~SampleList();
+
+  void set_last_resolved(const ObjectSample* sample);
+  ObjectSample* get();
+  ObjectSample* last() const;
+  void release(ObjectSample* sample);
+  const ObjectSample* last_resolved() const;
+  ObjectSample* reuse(ObjectSample* sample);
+  bool is_full() const;
+  size_t count() const;
+};
+
+#endif // SHARE_VM_JFR_LEAKPROFILER_SAMPLING_SAMPLELIST_HPP