view src/share/vm/gc_implementation/g1/survRateGroup.hpp @ 2034:7e37af9d69ef

7011379: G1: overly long concurrent marking cycles Summary: This changeset introduces filtering of SATB buffers at the point when they are about to be enqueued. If this filtering clears enough entries on each buffer, the buffer can then be re-used and not enqueued. This cuts down the number of SATB buffers that need to be processed by the concurrent marking threads. Reviewed-by: johnc, ysr
author tonyp
date Wed, 19 Jan 2011 09:35:17 -0500
parents c18cbe5936b8
children d2a62e0f25eb
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 * 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.
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#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