jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/survRateGroup.hpp@595c0f60d50d

8029075: String deduplication in G1
Summary: Implementation of JEP 192, http://openjdk.java.net/jeps/192
Reviewed-by: brutisso, tschatzl, coleenp

     1 /*

     2  * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_SURVRATEGROUP_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_G1_SURVRATEGROUP_HPP

    28 #include "utilities/numberSeq.hpp"

    30 class G1CollectorPolicy;

    32 class SurvRateGroup : public CHeapObj<mtGC> {

    33 private:

    34   G1CollectorPolicy* _g1p;

    35   const char* _name;

    37   size_t  _stats_arrays_length;

    38   double* _surv_rate;

    39   double* _accum_surv_rate_pred;

    40   double  _last_pred;

    41   double  _accum_surv_rate;

    42   TruncatedSeq** _surv_rate_pred;

    43   NumberSeq**    _summary_surv_rates;

    44   size_t         _summary_surv_rates_len;

    45   size_t         _summary_surv_rates_max_len;

    47   int _all_regions_allocated;

    48   size_t _region_num;

    49   size_t _setup_seq_num;

    51 public:

    52   SurvRateGroup(G1CollectorPolicy* g1p,

    53                 const char* name,

    54                 size_t summary_surv_rates_len);

    55   void reset();

    56   void start_adding_regions();

    57   void stop_adding_regions();

    58   void record_surviving_words(int age_in_group, size_t surv_words);

    59   void all_surviving_words_recorded(bool propagate);

    60   const char* name() { return _name; }

    62   size_t region_num() { return _region_num; }

    63   double accum_surv_rate_pred(int age) {

    64     assert(age >= 0, "must be");

    65     if ((size_t)age < _stats_arrays_length)

    66       return _accum_surv_rate_pred[age];

    67     else {

    68       double diff = (double) (age - _stats_arrays_length + 1);

    69       return _accum_surv_rate_pred[_stats_arrays_length-1] + diff * _last_pred;

    70     }

    71   }

    73   double accum_surv_rate(size_t adjustment);

    75   TruncatedSeq* get_seq(size_t age) {

    76     if (age >= _setup_seq_num) {

    77       guarantee( _setup_seq_num > 0, "invariant" );

    78       age = _setup_seq_num-1;

    79     }

    80     TruncatedSeq* seq = _surv_rate_pred[age];

    81     guarantee( seq != NULL, "invariant" );

    82     return seq;

    83   }

    85   int next_age_index();

    86   int age_in_group(int age_index) {

    87     int ret = (int) (_all_regions_allocated - age_index);

    88     assert( ret >= 0, "invariant" );

    89     return ret;

    90   }

    91   void finished_recalculating_age_indexes() {

    92     _all_regions_allocated = 0;

    93   }

    95 #ifndef PRODUCT

    96   void print();

    97   void print_surv_rate_summary();

    98 #endif // PRODUCT

    99 };

   101 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_SURVRATEGROUP_HPP

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