1/*
2 * Copyright (c) 2003, 2015, 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 */
24
25#include "precompiled.hpp"
26#include "gc/parallel/adjoiningVirtualSpaces.hpp"
27#include "memory/allocation.inline.hpp"
28#include "runtime/java.hpp"
29
30AdjoiningVirtualSpaces::AdjoiningVirtualSpaces(ReservedSpace rs,
31 size_t min_low_byte_size,
32 size_t min_high_byte_size,
33 size_t alignment) :
34 _high(NULL), _low(NULL),
35 _reserved_space(rs), _min_low_byte_size(min_low_byte_size),
36 _min_high_byte_size(min_high_byte_size),
37 _alignment(alignment) {}
38
39// The maximum byte sizes are for the initial layout of the
40// virtual spaces and are not the limit on the maximum bytes sizes.
41void AdjoiningVirtualSpaces::initialize(size_t max_low_byte_size,
42 size_t init_low_byte_size,
43 size_t init_high_byte_size) {
44
45 // The reserved spaces for the two parts of the virtual space.
46 ReservedSpace old_rs = _reserved_space.first_part(max_low_byte_size);
47 ReservedSpace young_rs = _reserved_space.last_part(max_low_byte_size);
48
49 _low = new PSVirtualSpace(old_rs, alignment());
50 if (!_low->expand_by(init_low_byte_size)) {
51 vm_exit_during_initialization("Could not reserve enough space for "
52 "object heap");
53 }
54
55 _high = new PSVirtualSpaceHighToLow(young_rs, alignment());
56 if (!_high->expand_by(init_high_byte_size)) {
57 vm_exit_during_initialization("Could not reserve enough space for "
58 "object heap");
59 }
60}
61
62bool AdjoiningVirtualSpaces::adjust_boundary_up(size_t change_in_bytes) {
63 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check");
64 size_t actual_change = low()->expand_into(high(), change_in_bytes);
65 return actual_change != 0;
66}
67
68bool AdjoiningVirtualSpaces::adjust_boundary_down(size_t change_in_bytes) {
69 assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check");
70 size_t actual_change = high()->expand_into(low(), change_in_bytes);
71 return actual_change != 0;
72}
73