jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/survRateGroup.hpp@4e5661ba9d98

6944166: G1: explicit GCs are not always handled correctly
Summary: G1 was not handling explicit GCs correctly in many ways. It does now. See the CR for the list of improvements contained in this changeset.
Reviewed-by: iveresov, ysr, johnc

     1 /*

     2  * Copyright (c) 2001, 2010, 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 class G1CollectorPolicy;

    27 class SurvRateGroup : public CHeapObj {

    28 private:

    29   G1CollectorPolicy* _g1p;

    30   const char* _name;

    32   size_t  _stats_arrays_length;

    33   double* _surv_rate;

    34   double* _accum_surv_rate_pred;

    35   double  _last_pred;

    36   double  _accum_surv_rate;

    37   TruncatedSeq** _surv_rate_pred;

    38   NumberSeq**    _summary_surv_rates;

    39   size_t         _summary_surv_rates_len;

    40   size_t         _summary_surv_rates_max_len;

    42   int _all_regions_allocated;

    43   size_t _region_num;

    44   size_t _setup_seq_num;

    46 public:

    47   SurvRateGroup(G1CollectorPolicy* g1p,

    48                 const char* name,

    49                 size_t summary_surv_rates_len);

    50   void reset();

    51   void start_adding_regions();

    52   void stop_adding_regions();

    53   void record_surviving_words(int age_in_group, size_t surv_words);

    54   void all_surviving_words_recorded(bool propagate);

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

    57   size_t region_num() { return _region_num; }

    58   double accum_surv_rate_pred(int age) {

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

    60     if ((size_t)age < _stats_arrays_length)

    61       return _accum_surv_rate_pred[age];

    62     else {

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

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

    65     }

    66   }

    68   double accum_surv_rate(size_t adjustment);

    70   TruncatedSeq* get_seq(size_t age) {

    71     if (age >= _setup_seq_num) {

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

    73       age = _setup_seq_num-1;

    74     }

    75     TruncatedSeq* seq = _surv_rate_pred[age];

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

    77     return seq;

    78   }

    80   int next_age_index();

    81   int age_in_group(int age_index) {

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

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

    84     return ret;

    85   }

    86   void finished_recalculating_age_indexes() {

    87     _all_regions_allocated = 0;

    88   }

    90 #ifndef PRODUCT

    91   void print();

    92   void print_surv_rate_summary();

    93 #endif // PRODUCT

    94 };

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/gc_implementation/g1/survRateGroup.hpp@4e5661ba9d98

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