hotspot/src/share/vm/gc_implementation/g1/survRateGroup.hpp
author xdono
Mon, 09 Mar 2009 13:28:46 -0700
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parent 2009 4adf43957a1b
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6814575: Update copyright year Summary: Update copyright for files that have been modified in 2009, up to 03/09 Reviewed-by: katleman, tbell, ohair
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/*
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 * Copyright 2001-2009 Sun Microsystems, Inc.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 *
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 */
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class G1CollectorPolicy;
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class SurvRateGroup : public CHeapObj {
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private:
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  G1CollectorPolicy* _g1p;
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  const char* _name;
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  size_t  _stats_arrays_length;
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  double* _surv_rate;
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  double* _accum_surv_rate_pred;
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  double  _last_pred;
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  double  _accum_surv_rate;
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  TruncatedSeq** _surv_rate_pred;
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  NumberSeq**    _summary_surv_rates;
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  size_t         _summary_surv_rates_len;
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  size_t         _summary_surv_rates_max_len;
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  int _all_regions_allocated;
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  size_t _region_num;
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  size_t _scan_only_prefix;
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  size_t _setup_seq_num;
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public:
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  SurvRateGroup(G1CollectorPolicy* g1p,
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                const char* name,
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                size_t summary_surv_rates_len);
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  void reset();
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  void start_adding_regions();
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  void stop_adding_regions();
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  void record_scan_only_prefix(size_t scan_only_prefix);
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  void record_surviving_words(int age_in_group, size_t surv_words);
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  void all_surviving_words_recorded(bool propagate);
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  const char* name() { return _name; }
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  size_t region_num() { return _region_num; }
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  size_t scan_only_length() { return _scan_only_prefix; }
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  double accum_surv_rate_pred(int age) {
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    assert(age >= 0, "must be");
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    if ((size_t)age < _stats_arrays_length)
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      return _accum_surv_rate_pred[age];
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    else {
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      double diff = (double) (age - _stats_arrays_length + 1);
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      return _accum_surv_rate_pred[_stats_arrays_length-1] + diff * _last_pred;
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    }
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  }
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  double accum_surv_rate(size_t adjustment);
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  TruncatedSeq* get_seq(size_t age) {
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    if (age >= _setup_seq_num) {
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      guarantee( _setup_seq_num > 0, "invariant" );
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      age = _setup_seq_num-1;
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    }
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    TruncatedSeq* seq = _surv_rate_pred[age];
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    guarantee( seq != NULL, "invariant" );
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    return seq;
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  }
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  int next_age_index();
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  int age_in_group(int age_index) {
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    int ret = (int) (_all_regions_allocated -  age_index);
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    assert( ret >= 0, "invariant" );
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    return ret;
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  }
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  int recalculate_age_index(int age_index) {
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    int new_age_index = (int) _scan_only_prefix - age_in_group(age_index);
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    guarantee( new_age_index >= 0, "invariant" );
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    return new_age_index;
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  }
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  void finished_recalculating_age_indexes() {
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    _all_regions_allocated = (int) _scan_only_prefix;
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  }
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#ifndef PRODUCT
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  void print();
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  void print_surv_rate_summary();
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#endif // PRODUCT
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};