jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/adjoiningVirtualSpaces.cpp@da91efe96a93

6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>

     1 /*

     2  * Copyright (c) 2003, 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 #include "precompiled.hpp"

    26 #include "gc_implementation/parallelScavenge/adjoiningVirtualSpaces.hpp"

    27 #include "runtime/java.hpp"

    29 AdjoiningVirtualSpaces::AdjoiningVirtualSpaces(ReservedSpace rs,

    30                                                size_t min_low_byte_size,

    31                                                size_t min_high_byte_size,

    32                                                size_t alignment) :

    33   _reserved_space(rs), _min_low_byte_size(min_low_byte_size),

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

    35   _alignment(alignment) {}

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

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

    39 void AdjoiningVirtualSpaces::initialize(size_t max_low_byte_size,

    40                                         size_t init_low_byte_size,

    41                                         size_t init_high_byte_size) {

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

    44   ReservedSpace old_rs   = _reserved_space.first_part(max_low_byte_size);

    45   ReservedSpace young_rs = _reserved_space.last_part(max_low_byte_size);

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

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

    49     vm_exit_during_initialization("Could not reserve enough space for "

    50                                   "object heap");

    51   }

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

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

    55     vm_exit_during_initialization("Could not reserve enough space for "

    56                                   "object heap");

    57   }

    58 }

    60 bool AdjoiningVirtualSpaces::adjust_boundary_up(size_t change_in_bytes) {

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

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

    63   return actual_change != 0;

    64 }

    66 bool AdjoiningVirtualSpaces::adjust_boundary_down(size_t change_in_bytes) {

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

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

    69   return actual_change != 0;

    70 }

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

src/share/vm/gc_implementation/parallelScavenge/adjoiningVirtualSpaces.cpp@da91efe96a93

src/share/vm/gc_implementation/parallelScavenge/adjoiningVirtualSpaces.cpp