view src/share/vm/gc_implementation/g1/survRateGroup.hpp @ 2981:2ace1c4ee8da

6888336: G1: avoid explicitly marking and pushing objects in survivor spaces Summary: This change simplifies the interaction between GC and concurrent marking. By disabling survivor spaces during the initial-mark pause we don't need to propagate marks of objects we copy during each GC (since we never need to copy an explicitly marked object). Reviewed-by: johnc, brutisso
author tonyp
date Tue, 10 Jan 2012 18:58:13 -0500
parents c18cbe5936b8
children d2a62e0f25eb
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 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
 * 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 if you need additional information or have any
 * questions.


#include "utilities/numberSeq.hpp"

class G1CollectorPolicy;

class SurvRateGroup : public CHeapObj {
  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;

  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