6711316: Open source the Garbage-First garbage collector

First mercurial integration of the code for the Garbage-First garbage collector.

Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr

hotspot/src/share/vm/gc_implementation/g1/survRateGroup.hpp

@@ -0,0 +1,102 @@
+/*
+ * Copyright 2001-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+class G1CollectorPolicy;
+
+class SurvRateGroup : public CHeapObj {
+private:
+  G1CollectorPolicy* _g1p;
+  const char* _name;
+
+  size_t  _array_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 _curr_length;
+  size_t _scan_only_prefix;
+  size_t _setup_seq_num;
+
+public:
+  SurvRateGroup(G1CollectorPolicy* g1p,
+                const char* name,
+                size_t summary_surv_rates_len);
+  void start_adding_regions();
+  void stop_adding_regions();
+  void record_scan_only_prefix(size_t scan_only_prefix);
+  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 _curr_length; }
+  size_t scan_only_length() { return _scan_only_prefix; }
+  double accum_surv_rate_pred(int age) {
+    assert(age >= 0, "must be");
+    if ((size_t)age < _array_length)
+      return _accum_surv_rate_pred[age];
+    else {
+      double diff = (double) (age - _array_length + 1);
+      return _accum_surv_rate_pred[_array_length-1] + diff * _last_pred;
+    }
+  }
+
+  double accum_surv_rate(size_t adjustment);
+
+  TruncatedSeq* get_seq(size_t age) {
+    guarantee( 0 <= age, "pre-condition" );
+    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;
+  }
+  int recalculate_age_index(int age_index) {
+    int new_age_index = (int) _scan_only_prefix - age_in_group(age_index);
+    guarantee( new_age_index >= 0, "invariant" );
+    return new_age_index;
+  }
+  void finished_recalculating_age_indexes() {
+    _all_regions_allocated = (int) _scan_only_prefix;
+  }
+
+#ifndef PRODUCT
+  void print();
+  void print_surv_rate_summary();
+#endif // PRODUCT
+};