--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc/g1/survRateGroup.hpp	Wed May 13 15:16:06 2015 +0200
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2001, 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_G1_SURVRATEGROUP_HPP
+#define SHARE_VM_GC_G1_SURVRATEGROUP_HPP
+
+#include "utilities/numberSeq.hpp"
+
+class G1CollectorPolicy;
+
+class SurvRateGroup : public CHeapObj<mtGC> {
+private:
+  G1CollectorPolicy* _g1p;
+  const char* _name;
+
+  size_t  _stats_arrays_length;
+  double* _surv_rate;
+  double* _accum_surv_rate_pred;
+  double  _last_pred;
+  double  _accum_surv_rate;
+  TruncatedSeq** _surv_rate_pred;
+  NumberSeq**    _summary_surv_rates;
+  size_t         _summary_surv_rates_len;
+  size_t         _summary_surv_rates_max_len;
+
+  int _all_regions_allocated;
+  size_t _region_num;
+  size_t _setup_seq_num;
+
+public:
+  SurvRateGroup(G1CollectorPolicy* g1p,
+                const char* name,
+                size_t summary_surv_rates_len);
+  void reset();
+  void start_adding_regions();
+  void stop_adding_regions();
+  void record_surviving_words(int age_in_group, size_t surv_words);
+  void all_surviving_words_recorded(bool propagate);
+  const char* name() { return _name; }
+
+  size_t region_num() { return _region_num; }
+  double accum_surv_rate_pred(int age) {
+    assert(age >= 0, "must be");
+    if ((size_t)age < _stats_arrays_length)
+      return _accum_surv_rate_pred[age];
+    else {
+      double diff = (double) (age - _stats_arrays_length + 1);
+      return _accum_surv_rate_pred[_stats_arrays_length-1] + diff * _last_pred;
+    }
+  }
+
+  double accum_surv_rate(size_t adjustment);
+
+  TruncatedSeq* get_seq(size_t age) {
+    if (age >= _setup_seq_num) {
+      guarantee( _setup_seq_num > 0, "invariant" );
+      age = _setup_seq_num-1;
+    }
+    TruncatedSeq* seq = _surv_rate_pred[age];
+    guarantee( seq != NULL, "invariant" );
+    return seq;
+  }
+
+  int next_age_index();
+  int age_in_group(int age_index) {
+    int ret = (int) (_all_regions_allocated - age_index);
+    assert( ret >= 0, "invariant" );
+    return ret;
+  }
+  void finished_recalculating_age_indexes() {
+    _all_regions_allocated = 0;
+  }
+
+#ifndef PRODUCT
+  void print();
+  void print_surv_rate_summary();
+#endif // PRODUCT
+};
+
+#endif // SHARE_VM_GC_G1_SURVRATEGROUP_HPP