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20337
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1 /*
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "gc_implementation/g1/g1PageBasedVirtualSpace.hpp"
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27 #include "oops/markOop.hpp"
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28 #include "oops/oop.inline.hpp"
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29 #include "services/memTracker.hpp"
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30 #ifdef TARGET_OS_FAMILY_linux
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31 # include "os_linux.inline.hpp"
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32 #endif
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33 #ifdef TARGET_OS_FAMILY_solaris
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34 # include "os_solaris.inline.hpp"
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35 #endif
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36 #ifdef TARGET_OS_FAMILY_windows
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37 # include "os_windows.inline.hpp"
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38 #endif
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39 #ifdef TARGET_OS_FAMILY_aix
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40 # include "os_aix.inline.hpp"
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41 #endif
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42 #ifdef TARGET_OS_FAMILY_bsd
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43 # include "os_bsd.inline.hpp"
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44 #endif
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45 #include "utilities/bitMap.inline.hpp"
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46
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47 G1PageBasedVirtualSpace::G1PageBasedVirtualSpace() : _low_boundary(NULL),
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48 _high_boundary(NULL), _committed(), _page_size(0), _special(false), _executable(false) {
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49 }
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50
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51 bool G1PageBasedVirtualSpace::initialize_with_granularity(ReservedSpace rs, size_t page_size) {
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52 if (!rs.is_reserved()) {
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53 return false; // Allocation failed.
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54 }
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55 assert(_low_boundary == NULL, "VirtualSpace already initialized");
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56 assert(page_size > 0, "Granularity must be non-zero.");
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57
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58 _low_boundary = rs.base();
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59 _high_boundary = _low_boundary + rs.size();
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60
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61 _special = rs.special();
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62 _executable = rs.executable();
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63
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64 _page_size = page_size;
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65
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66 assert(_committed.size() == 0, "virtual space initialized more than once");
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67 uintx size_in_bits = rs.size() / page_size;
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68 _committed.resize(size_in_bits, /* in_resource_area */ false);
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69
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70 return true;
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71 }
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72
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73
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74 G1PageBasedVirtualSpace::~G1PageBasedVirtualSpace() {
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75 release();
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76 }
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77
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78 void G1PageBasedVirtualSpace::release() {
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79 // This does not release memory it never reserved.
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80 // Caller must release via rs.release();
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81 _low_boundary = NULL;
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82 _high_boundary = NULL;
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83 _special = false;
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84 _executable = false;
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85 _page_size = 0;
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86 _committed.resize(0, false);
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87 }
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88
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89 size_t G1PageBasedVirtualSpace::committed_size() const {
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90 return _committed.count_one_bits() * _page_size;
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91 }
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92
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93 size_t G1PageBasedVirtualSpace::reserved_size() const {
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94 return pointer_delta(_high_boundary, _low_boundary, sizeof(char));
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95 }
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96
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97 size_t G1PageBasedVirtualSpace::uncommitted_size() const {
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98 return reserved_size() - committed_size();
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99 }
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100
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101 uintptr_t G1PageBasedVirtualSpace::addr_to_page_index(char* addr) const {
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102 return (addr - _low_boundary) / _page_size;
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103 }
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104
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105 bool G1PageBasedVirtualSpace::is_area_committed(uintptr_t start, size_t size_in_pages) const {
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106 uintptr_t end = start + size_in_pages;
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107 return _committed.get_next_zero_offset(start, end) >= end;
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108 }
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109
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110 bool G1PageBasedVirtualSpace::is_area_uncommitted(uintptr_t start, size_t size_in_pages) const {
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111 uintptr_t end = start + size_in_pages;
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112 return _committed.get_next_one_offset(start, end) >= end;
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113 }
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114
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115 char* G1PageBasedVirtualSpace::page_start(uintptr_t index) {
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116 return _low_boundary + index * _page_size;
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117 }
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118
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119 size_t G1PageBasedVirtualSpace::byte_size_for_pages(size_t num) {
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120 return num * _page_size;
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121 }
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122
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123 MemRegion G1PageBasedVirtualSpace::commit(uintptr_t start, size_t size_in_pages) {
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124 // We need to make sure to commit all pages covered by the given area.
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125 guarantee(is_area_uncommitted(start, size_in_pages), "Specified area is not uncommitted");
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126
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127 if (!_special) {
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128 os::commit_memory_or_exit(page_start(start), byte_size_for_pages(size_in_pages), _executable,
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129 err_msg("Failed to commit pages from "SIZE_FORMAT" of length "SIZE_FORMAT, start, size_in_pages));
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130 }
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131 _committed.set_range(start, start + size_in_pages);
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132
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133 MemRegion result((HeapWord*)page_start(start), byte_size_for_pages(size_in_pages) / HeapWordSize);
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134 return result;
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135 }
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136
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137 MemRegion G1PageBasedVirtualSpace::uncommit(uintptr_t start, size_t size_in_pages) {
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138 guarantee(is_area_committed(start, size_in_pages), "checking");
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139
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140 if (!_special) {
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141 os::uncommit_memory(page_start(start), byte_size_for_pages(size_in_pages));
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142 }
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143
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144 _committed.clear_range(start, start + size_in_pages);
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145
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146 MemRegion result((HeapWord*)page_start(start), byte_size_for_pages(size_in_pages) / HeapWordSize);
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147 return result;
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148 }
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149
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150 bool G1PageBasedVirtualSpace::contains(const void* p) const {
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151 return _low_boundary <= (const char*) p && (const char*) p < _high_boundary;
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152 }
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153
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154 #ifndef PRODUCT
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155 void G1PageBasedVirtualSpace::print_on(outputStream* out) {
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156 out->print ("Virtual space:");
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157 if (special()) out->print(" (pinned in memory)");
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158 out->cr();
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159 out->print_cr(" - committed: " SIZE_FORMAT, committed_size());
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160 out->print_cr(" - reserved: " SIZE_FORMAT, reserved_size());
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161 out->print_cr(" - [low_b, high_b]: [" INTPTR_FORMAT ", " INTPTR_FORMAT "]", p2i(_low_boundary), p2i(_high_boundary));
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162 }
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163
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164 void G1PageBasedVirtualSpace::print() {
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165 print_on(tty);
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166 }
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167 #endif
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