jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/generationSizer.hpp@a93a9eda13f7

     1 /*

     2  * Copyright (c) 2001, 2008, 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

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    23  */

    25 // There is a nice batch of tested generation sizing code in

    26 // TwoGenerationCollectorPolicy. Lets reuse it!

    28 class GenerationSizer : public TwoGenerationCollectorPolicy {

    29  public:

    30   GenerationSizer() {

    31     // Partial init only!

    32     initialize_flags();

    33     initialize_size_info();

    34   }

    36   void initialize_flags() {

    37     // Do basic sizing work

    38     this->TwoGenerationCollectorPolicy::initialize_flags();

    40     // If the user hasn't explicitly set the number of worker

    41     // threads, set the count.

    42     assert(UseSerialGC ||

    43            !FLAG_IS_DEFAULT(ParallelGCThreads) ||

    44            (ParallelGCThreads > 0),

    45            "ParallelGCThreads should be set before flag initialization");

    47     // The survivor ratio's are calculated "raw", unlike the

    48     // default gc, which adds 2 to the ratio value. We need to

    49     // make sure the values are valid before using them.

    50     if (MinSurvivorRatio < 3) {

    51       MinSurvivorRatio = 3;

    52     }

    54     if (InitialSurvivorRatio < 3) {

    55       InitialSurvivorRatio = 3;

    56     }

    57   }

    59   size_t min_young_gen_size() { return _min_gen0_size; }

    60   size_t young_gen_size()     { return _initial_gen0_size; }

    61   size_t max_young_gen_size() { return _max_gen0_size; }

    63   size_t min_old_gen_size()   { return _min_gen1_size; }

    64   size_t old_gen_size()       { return _initial_gen1_size; }

    65   size_t max_old_gen_size()   { return _max_gen1_size; }

    67   size_t perm_gen_size()      { return PermSize; }

    68   size_t max_perm_gen_size()  { return MaxPermSize; }

    69 };

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