jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/adjoiningVirtualSpaces.cpp@0f773163217d

6765954: par compact - stress mode for splitting young gen spaces
Reviewed-by: jmasa

     1 /*

     2  * Copyright 2003-2005 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 # include "incls/_precompiled.incl"

    26 # include "incls/_adjoiningVirtualSpaces.cpp.incl"

    28 AdjoiningVirtualSpaces::AdjoiningVirtualSpaces(ReservedSpace rs,

    29                                                size_t min_low_byte_size,

    30                                                size_t min_high_byte_size,

    31                                                size_t alignment) :

    32   _reserved_space(rs), _min_low_byte_size(min_low_byte_size),

    33   _min_high_byte_size(min_high_byte_size), _low(0), _high(0),

    34   _alignment(alignment) {}

    36 // The maximum byte sizes are for the initial layout of the

    37 // virtual spaces and are not the limit on the maximum bytes sizes.

    38 void AdjoiningVirtualSpaces::initialize(size_t max_low_byte_size,

    39                                         size_t init_low_byte_size,

    40                                         size_t init_high_byte_size) {

    42   // The reserved spaces for the two parts of the virtual space.

    43   ReservedSpace old_rs   = _reserved_space.first_part(max_low_byte_size);

    44   ReservedSpace young_rs = _reserved_space.last_part(max_low_byte_size);

    46   _low = new PSVirtualSpace(old_rs, alignment());

    47   if (!_low->expand_by(init_low_byte_size)) {

    48     vm_exit_during_initialization("Could not reserve enough space for "

    49                                   "object heap");

    50   }

    52   _high = new PSVirtualSpaceHighToLow(young_rs, alignment());

    53   if (!_high->expand_by(init_high_byte_size)) {

    54     vm_exit_during_initialization("Could not reserve enough space for "

    55                                   "object heap");

    56   }

    57 }

    59 bool AdjoiningVirtualSpaces::adjust_boundary_up(size_t change_in_bytes) {

    60   assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check");

    61   size_t actual_change = low()->expand_into(high(), change_in_bytes);

    62   return actual_change != 0;

    63 }

    65 bool AdjoiningVirtualSpaces::adjust_boundary_down(size_t change_in_bytes) {

    66   assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check");

    67   size_t actual_change = high()->expand_into(low(), change_in_bytes);

    68   return actual_change != 0;

    69 }

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