jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/adjoiningGenerations.hpp@c18cbe5936b8

6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair

     1 /*

     2  * Copyright (c) 2003, 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  */

    26 // Contains two generations that both use an AdjoiningVirtualSpaces.

    27 // The two generations are adjacent in the reserved space for the

    28 // heap.  Each generation has a virtual space and shrinking and

    29 // expanding of the generations can still be down with that

    30 // virtual space as was previously done.  If expanding of reserved

    31 // size of a generation is required, the adjacent generation

    32 // must be shrunk.  Adjusting the boundary between the generations

    33 // is called for in this class.

    35 class AdjoiningGenerations : public CHeapObj {

    36   friend class VMStructs;

    37  private:

    38   // The young generation and old generation, respectively

    39   PSYoungGen* _young_gen;

    40   PSOldGen* _old_gen;

    42   // The spaces used by the two generations.

    43   AdjoiningVirtualSpaces _virtual_spaces;

    45   // Move boundary up to expand old gen.  Checks are made to

    46   // determine if the move can be done with specified limits.

    47   void request_old_gen_expansion(size_t desired_change_in_bytes);

    48   // Move boundary down to expand young gen.

    49   bool request_young_gen_expansion(size_t desired_change_in_bytes);

    51  public:

    52   AdjoiningGenerations(ReservedSpace rs,

    53                        size_t init_low_byte_size,

    54                        size_t min_low_byte_size,

    55                        size_t max_low_byte_size,

    56                        size_t init_high_byte_size,

    57                        size_t min_high_byte_size,

    58                        size_t max_high_bytes_size,

    59                        size_t alignment);

    61   // Accessors

    62   PSYoungGen* young_gen() { return _young_gen; }

    63   PSOldGen* old_gen() { return _old_gen; }

    65   AdjoiningVirtualSpaces* virtual_spaces() { return &_virtual_spaces; }

    67   // Additional space is needed in the old generation.  Check

    68   // the available space and attempt to move the boundary if more space

    69   // is needed.  The growth is not guaranteed to occur.

    70   void adjust_boundary_for_old_gen_needs(size_t desired_change_in_bytes);

    71   // Similary for a growth of the young generation.

    72   void adjust_boundary_for_young_gen_needs(size_t eden_size, size_t survivor_size);

    74   // Return the total byte size of the reserved space

    75   // for the adjoining generations.

    76   size_t reserved_byte_size();

    77 };

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