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0
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1 /*
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2 * Copyright 2003-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 #include "incls/_precompiled.incl"
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26 #include "incls/_psVirtualspace.cpp.incl"
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27
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28 // PSVirtualSpace
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29
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30 PSVirtualSpace::PSVirtualSpace(ReservedSpace rs, size_t alignment) :
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31 _alignment(alignment)
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32 {
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33 set_reserved(rs);
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34 set_committed(reserved_low_addr(), reserved_low_addr());
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35 DEBUG_ONLY(verify());
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36 }
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37
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38 PSVirtualSpace::PSVirtualSpace(ReservedSpace rs) :
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39 _alignment(os::vm_page_size())
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40 {
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41 set_reserved(rs);
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42 set_committed(reserved_low_addr(), reserved_low_addr());
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43 DEBUG_ONLY(verify());
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44 }
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45
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46 // Deprecated.
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47 PSVirtualSpace::PSVirtualSpace(): _alignment(os::vm_page_size()) {
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48 }
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49
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50 // Deprecated.
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51 bool PSVirtualSpace::initialize(ReservedSpace rs,
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52 size_t commit_size) {
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53 set_reserved(rs);
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54 set_committed(reserved_low_addr(), reserved_low_addr());
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55
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56 // Commit to initial size.
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57 assert(commit_size <= rs.size(), "commit_size too big");
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58 bool result = commit_size > 0 ? expand_by(commit_size) : true;
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59 DEBUG_ONLY(verify());
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60 return result;
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61 }
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62
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63 PSVirtualSpace::~PSVirtualSpace() {
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64 release();
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65 }
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66
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67 bool PSVirtualSpace::contains(void* p) const {
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68 char* const cp = (char*)p;
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69 return cp >= committed_low_addr() && cp < committed_high_addr();
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70 }
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71
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72 void PSVirtualSpace::release() {
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73 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
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74 if (reserved_low_addr() != NULL) {
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75 if (special()) {
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76 os::release_memory_special(reserved_low_addr(), reserved_size());
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77 } else {
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78 (void)os::release_memory(reserved_low_addr(), reserved_size());
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79 }
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80 }
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81 _reserved_low_addr = _reserved_high_addr = NULL;
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82 _committed_low_addr = _committed_high_addr = NULL;
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83 _special = false;
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84 }
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85
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86 bool PSVirtualSpace::expand_by(size_t bytes, bool pre_touch) {
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87 assert(is_aligned(bytes), "arg not aligned");
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88 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
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89
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90 if (uncommitted_size() < bytes) {
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91 return false;
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92 }
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93
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94 char* const base_addr = committed_high_addr();
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95 bool result = special() || os::commit_memory(base_addr, bytes, alignment());
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96 if (result) {
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97 _committed_high_addr += bytes;
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98 }
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99
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100 if (pre_touch || AlwaysPreTouch) {
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101 for (char* curr = base_addr;
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102 curr < _committed_high_addr;
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103 curr += os::vm_page_size()) {
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104 char tmp = *curr;
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105 *curr = 0;
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106 }
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107 }
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108
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109 return result;
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110 }
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111
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112 bool PSVirtualSpace::shrink_by(size_t bytes) {
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113 assert(is_aligned(bytes), "arg not aligned");
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114 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
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115
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116 if (committed_size() < bytes) {
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117 return false;
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118 }
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119
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120 char* const base_addr = committed_high_addr() - bytes;
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121 bool result = special() || os::uncommit_memory(base_addr, bytes);
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122 if (result) {
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123 _committed_high_addr -= bytes;
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124 }
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125
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126 return result;
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127 }
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128
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129 size_t
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130 PSVirtualSpace::expand_into(PSVirtualSpace* other_space, size_t bytes) {
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131 assert(is_aligned(bytes), "arg not aligned");
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132 assert(grows_up(), "this space must grow up");
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133 assert(other_space->grows_down(), "other space must grow down");
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134 assert(reserved_high_addr() == other_space->reserved_low_addr(),
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135 "spaces not contiguous");
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136 assert(special() == other_space->special(), "one space is special, the other is not");
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137 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
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138 DEBUG_ONLY(PSVirtualSpaceVerifier other_verifier(other_space));
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139
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140 size_t bytes_needed = bytes;
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141
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142 // First use the uncommitted region in this space.
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143 size_t tmp_bytes = MIN2(uncommitted_size(), bytes_needed);
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144 if (tmp_bytes > 0) {
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145 if (expand_by(tmp_bytes)) {
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146 bytes_needed -= tmp_bytes;
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147 } else {
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148 return 0;
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149 }
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150 }
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151
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152 // Next take from the uncommitted region in the other space, and commit it.
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153 tmp_bytes = MIN2(other_space->uncommitted_size(), bytes_needed);
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154 if (tmp_bytes > 0) {
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155 char* const commit_base = committed_high_addr();
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156 if (other_space->special() ||
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157 os::commit_memory(commit_base, tmp_bytes, alignment())) {
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158 // Reduce the reserved region in the other space.
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159 other_space->set_reserved(other_space->reserved_low_addr() + tmp_bytes,
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160 other_space->reserved_high_addr(),
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161 other_space->special());
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162
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163 // Grow both reserved and committed in this space.
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164 _reserved_high_addr += tmp_bytes;
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165 _committed_high_addr += tmp_bytes;
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166 bytes_needed -= tmp_bytes;
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167 } else {
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168 return bytes - bytes_needed;
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169 }
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170 }
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171
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172 // Finally take from the already committed region in the other space.
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173 tmp_bytes = bytes_needed;
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174 if (tmp_bytes > 0) {
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175 // Reduce both committed and reserved in the other space.
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176 other_space->set_committed(other_space->committed_low_addr() + tmp_bytes,
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177 other_space->committed_high_addr());
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178 other_space->set_reserved(other_space->reserved_low_addr() + tmp_bytes,
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179 other_space->reserved_high_addr(),
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180 other_space->special());
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181
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182 // Grow both reserved and committed in this space.
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183 _reserved_high_addr += tmp_bytes;
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184 _committed_high_addr += tmp_bytes;
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185 }
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186
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187 return bytes;
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188 }
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189
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190 #ifndef PRODUCT
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191 bool PSVirtualSpace::is_aligned(size_t value, size_t align) {
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192 const size_t tmp_value = value + align - 1;
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193 const size_t mask = ~(align - 1);
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194 return (tmp_value & mask) == value;
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195 }
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196
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197 bool PSVirtualSpace::is_aligned(size_t value) const {
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198 return is_aligned(value, alignment());
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199 }
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200
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201 bool PSVirtualSpace::is_aligned(char* value) const {
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202 return is_aligned((size_t)value);
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203 }
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204
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205 void PSVirtualSpace::verify() const {
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206 assert(is_aligned(alignment(), os::vm_page_size()), "bad alignment");
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207 assert(is_aligned(reserved_low_addr()), "bad reserved_low_addr");
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208 assert(is_aligned(reserved_high_addr()), "bad reserved_high_addr");
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209 assert(is_aligned(committed_low_addr()), "bad committed_low_addr");
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210 assert(is_aligned(committed_high_addr()), "bad committed_high_addr");
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211
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212 // Reserved region must be non-empty or both addrs must be 0.
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213 assert(reserved_low_addr() < reserved_high_addr() ||
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214 reserved_low_addr() == NULL && reserved_high_addr() == NULL,
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215 "bad reserved addrs");
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216 assert(committed_low_addr() <= committed_high_addr(), "bad committed addrs");
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217
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218 if (grows_up()) {
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219 assert(reserved_low_addr() == committed_low_addr(), "bad low addrs");
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220 assert(reserved_high_addr() >= committed_high_addr(), "bad high addrs");
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221 } else {
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222 assert(reserved_high_addr() == committed_high_addr(), "bad high addrs");
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223 assert(reserved_low_addr() <= committed_low_addr(), "bad low addrs");
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224 }
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225 }
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226
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227 void PSVirtualSpace::print() const {
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228 gclog_or_tty->print_cr("virtual space [" PTR_FORMAT "]: alignment="
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229 SIZE_FORMAT "K grows %s%s",
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230 this, alignment() / K, grows_up() ? "up" : "down",
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231 special() ? " (pinned in memory)" : "");
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232 gclog_or_tty->print_cr(" reserved=" SIZE_FORMAT "K"
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233 " [" PTR_FORMAT "," PTR_FORMAT "]"
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234 " committed=" SIZE_FORMAT "K"
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235 " [" PTR_FORMAT "," PTR_FORMAT "]",
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236 reserved_size() / K,
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237 reserved_low_addr(), reserved_high_addr(),
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238 committed_size() / K,
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239 committed_low_addr(), committed_high_addr());
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240 }
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241 #endif // #ifndef PRODUCT
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242
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243 void PSVirtualSpace::print_space_boundaries_on(outputStream* st) const {
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244 st->print_cr(" [" PTR_FORMAT ", " PTR_FORMAT ", " PTR_FORMAT ")",
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245 low_boundary(), high(), high_boundary());
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246 }
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247
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248 PSVirtualSpaceHighToLow::PSVirtualSpaceHighToLow(ReservedSpace rs,
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249 size_t alignment) :
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250 PSVirtualSpace(alignment)
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251 {
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252 set_reserved(rs);
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253 set_committed(reserved_high_addr(), reserved_high_addr());
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254 DEBUG_ONLY(verify());
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255 }
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256
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257 PSVirtualSpaceHighToLow::PSVirtualSpaceHighToLow(ReservedSpace rs) {
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258 set_reserved(rs);
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259 set_committed(reserved_high_addr(), reserved_high_addr());
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260 DEBUG_ONLY(verify());
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261 }
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262
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263 bool PSVirtualSpaceHighToLow::expand_by(size_t bytes, bool pre_touch) {
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264 assert(is_aligned(bytes), "arg not aligned");
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265 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
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266
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267 if (uncommitted_size() < bytes) {
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268 return false;
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269 }
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270
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271 char* const base_addr = committed_low_addr() - bytes;
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272 bool result = special() || os::commit_memory(base_addr, bytes, alignment());
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273 if (result) {
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274 _committed_low_addr -= bytes;
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275 }
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276
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277 if (pre_touch || AlwaysPreTouch) {
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278 for (char* curr = base_addr;
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279 curr < _committed_high_addr;
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280 curr += os::vm_page_size()) {
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281 char tmp = *curr;
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282 *curr = 0;
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283 }
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284 }
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285
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286 return result;
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287 }
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288
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289 bool PSVirtualSpaceHighToLow::shrink_by(size_t bytes) {
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290 assert(is_aligned(bytes), "arg not aligned");
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291 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
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292
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293 if (committed_size() < bytes) {
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294 return false;
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295 }
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296
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297 char* const base_addr = committed_low_addr();
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298 bool result = special() || os::uncommit_memory(base_addr, bytes);
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299 if (result) {
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300 _committed_low_addr += bytes;
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301 }
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302
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303 return result;
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304 }
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305
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306 size_t PSVirtualSpaceHighToLow::expand_into(PSVirtualSpace* other_space,
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307 size_t bytes) {
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308 assert(is_aligned(bytes), "arg not aligned");
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309 assert(grows_down(), "this space must grow down");
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310 assert(other_space->grows_up(), "other space must grow up");
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311 assert(reserved_low_addr() == other_space->reserved_high_addr(),
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312 "spaces not contiguous");
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313 assert(special() == other_space->special(), "one space is special in memory, the other is not");
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314 DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
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315 DEBUG_ONLY(PSVirtualSpaceVerifier other_verifier(other_space));
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316
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317 size_t bytes_needed = bytes;
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318
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319 // First use the uncommitted region in this space.
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320 size_t tmp_bytes = MIN2(uncommitted_size(), bytes_needed);
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321 if (tmp_bytes > 0) {
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322 if (expand_by(tmp_bytes)) {
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323 bytes_needed -= tmp_bytes;
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324 } else {
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325 return 0;
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326 }
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327 }
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328
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329 // Next take from the uncommitted region in the other space, and commit it.
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330 tmp_bytes = MIN2(other_space->uncommitted_size(), bytes_needed);
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331 if (tmp_bytes > 0) {
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332 char* const commit_base = committed_low_addr() - tmp_bytes;
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333 if (other_space->special() ||
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334 os::commit_memory(commit_base, tmp_bytes, alignment())) {
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335 // Reduce the reserved region in the other space.
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336 other_space->set_reserved(other_space->reserved_low_addr(),
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337 other_space->reserved_high_addr() - tmp_bytes,
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338 other_space->special());
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339
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340 // Grow both reserved and committed in this space.
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341 _reserved_low_addr -= tmp_bytes;
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342 _committed_low_addr -= tmp_bytes;
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343 bytes_needed -= tmp_bytes;
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344 } else {
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345 return bytes - bytes_needed;
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346 }
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347 }
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348
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349 // Finally take from the already committed region in the other space.
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350 tmp_bytes = bytes_needed;
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351 if (tmp_bytes > 0) {
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352 // Reduce both committed and reserved in the other space.
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353 other_space->set_committed(other_space->committed_low_addr(),
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354 other_space->committed_high_addr() - tmp_bytes);
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355 other_space->set_reserved(other_space->reserved_low_addr(),
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356 other_space->reserved_high_addr() - tmp_bytes,
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357 other_space->special());
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358
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359 // Grow both reserved and committed in this space.
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360 _reserved_low_addr -= tmp_bytes;
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361 _committed_low_addr -= tmp_bytes;
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362 }
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363
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364 return bytes;
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365 }
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366
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367 void
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368 PSVirtualSpaceHighToLow::print_space_boundaries_on(outputStream* st) const {
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369 st->print_cr(" (" PTR_FORMAT ", " PTR_FORMAT ", " PTR_FORMAT "]",
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370 high_boundary(), low(), low_boundary());
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371 }
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