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annotate src/share/vm/gc_implementation/g1/bufferingOopClosure.hpp @ 1552:c18cbe5936b8

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6941466: Oracle rebranding changes for Hotspot repositories Summary: Change all the Sun copyrights to Oracle copyright Reviewed-by: ohair
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date Thu, 27 May 2010 19:08:38 -0700
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1 /*
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2 * Copyright (c) 2001, 2007, 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 // A BufferingOops closure tries to separate out the cost of finding roots
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26 // from the cost of applying closures to them. It maintains an array of
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27 // ref-containing locations. Until the array is full, applying the closure
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28 // to an oop* merely records that location in the array. Since this
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29 // closure app cost is small, an elapsed timer can approximately attribute
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30 // all of this cost to the cost of finding the roots. When the array fills
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31 // up, the wrapped closure is applied to all elements, keeping track of
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32 // this elapsed time of this process, and leaving the array empty.
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33 // The caller must be sure to call "done" to process any unprocessed
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34 // buffered entriess.
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35
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36 class Generation;
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37 class HeapRegion;
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38
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39 class BufferingOopClosure: public OopClosure {
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40 protected:
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41 enum PrivateConstants {
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42 BufferLength = 1024
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43 };
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44
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45 StarTask _buffer[BufferLength];
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46 StarTask* _buffer_top;
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47 StarTask* _buffer_curr;
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48
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49 OopClosure* _oc;
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50 double _closure_app_seconds;
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51
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52 void process_buffer () {
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53 double start = os::elapsedTime();
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54 for (StarTask* curr = _buffer; curr < _buffer_curr; ++curr) {
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55 if (curr->is_narrow()) {
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56 assert(UseCompressedOops, "Error");
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57 _oc->do_oop((narrowOop*)(*curr));
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58 } else {
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59 _oc->do_oop((oop*)(*curr));
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60 }
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61 }
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62 _buffer_curr = _buffer;
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63 _closure_app_seconds += (os::elapsedTime() - start);
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64 }
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65
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66 template <class T> inline void do_oop_work(T* p) {
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67 if (_buffer_curr == _buffer_top) {
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68 process_buffer();
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69 }
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70 StarTask new_ref(p);
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71 *_buffer_curr = new_ref;
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72 ++_buffer_curr;
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73 }
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74
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75 public:
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76 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
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77 virtual void do_oop(oop* p) { do_oop_work(p); }
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78
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79 void done () {
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80 if (_buffer_curr > _buffer) {
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81 process_buffer();
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82 }
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83 }
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84 double closure_app_seconds () {
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85 return _closure_app_seconds;
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86 }
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87 BufferingOopClosure (OopClosure *oc) :
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88 _oc(oc),
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89 _buffer_curr(_buffer), _buffer_top(_buffer + BufferLength),
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90 _closure_app_seconds(0.0) { }
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91 };
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92
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93 class BufferingOopsInGenClosure: public OopsInGenClosure {
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94 BufferingOopClosure _boc;
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95 OopsInGenClosure* _oc;
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96 protected:
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97 template <class T> inline void do_oop_work(T* p) {
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98 assert(generation()->is_in_reserved((void*)p), "Must be in!");
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99 _boc.do_oop(p);
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100 }
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101 public:
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102 BufferingOopsInGenClosure(OopsInGenClosure *oc) :
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103 _boc(oc), _oc(oc) {}
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104
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105 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
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106 virtual void do_oop(oop* p) { do_oop_work(p); }
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107
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108 void done() {
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109 _boc.done();
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110 }
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111
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112 double closure_app_seconds () {
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113 return _boc.closure_app_seconds();
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114 }
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115
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116 void set_generation(Generation* gen) {
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117 OopsInGenClosure::set_generation(gen);
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118 _oc->set_generation(gen);
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119 }
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120
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121 void reset_generation() {
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122 // Make sure we finish the current work with the current generation.
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123 _boc.done();
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124 OopsInGenClosure::reset_generation();
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125 _oc->reset_generation();
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126 }
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127
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128 };
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129
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130
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131 class BufferingOopsInHeapRegionClosure: public OopsInHeapRegionClosure {
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132 private:
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133 enum PrivateConstants {
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134 BufferLength = 1024
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135 };
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136
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137 StarTask _buffer[BufferLength];
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138 StarTask* _buffer_top;
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139 StarTask* _buffer_curr;
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140
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141 HeapRegion* _hr_buffer[BufferLength];
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142 HeapRegion** _hr_curr;
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143
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144 OopsInHeapRegionClosure* _oc;
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145 double _closure_app_seconds;
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146
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147 void process_buffer () {
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148
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149 assert((_hr_curr - _hr_buffer) == (_buffer_curr - _buffer),
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150 "the two lengths should be the same");
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151
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152 double start = os::elapsedTime();
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153 HeapRegion** hr_curr = _hr_buffer;
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154 HeapRegion* hr_prev = NULL;
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155 for (StarTask* curr = _buffer; curr < _buffer_curr; ++curr) {
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156 HeapRegion* region = *hr_curr;
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157 if (region != hr_prev) {
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158 _oc->set_region(region);
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159 hr_prev = region;
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160 }
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161 if (curr->is_narrow()) {
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162 assert(UseCompressedOops, "Error");
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163 _oc->do_oop((narrowOop*)(*curr));
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164 } else {
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165 _oc->do_oop((oop*)(*curr));
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166 }
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167 ++hr_curr;
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168 }
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169 _buffer_curr = _buffer;
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170 _hr_curr = _hr_buffer;
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171 _closure_app_seconds += (os::elapsedTime() - start);
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172 }
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173
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174 public:
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175 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
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176 virtual void do_oop( oop* p) { do_oop_work(p); }
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177
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178 template <class T> void do_oop_work(T* p) {
342
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179 if (_buffer_curr == _buffer_top) {
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180 assert(_hr_curr > _hr_buffer, "_hr_curr should be consistent with _buffer_curr");
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181 process_buffer();
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182 }
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183 StarTask new_ref(p);
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184 *_buffer_curr = new_ref;
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185 ++_buffer_curr;
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186 *_hr_curr = _from;
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187 ++_hr_curr;
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188 }
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189 void done () {
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190 if (_buffer_curr > _buffer) {
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191 assert(_hr_curr > _hr_buffer, "_hr_curr should be consistent with _buffer_curr");
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192 process_buffer();
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193 }
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194 }
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195 double closure_app_seconds () {
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196 return _closure_app_seconds;
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197 }
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198 BufferingOopsInHeapRegionClosure (OopsInHeapRegionClosure *oc) :
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199 _oc(oc),
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200 _buffer_curr(_buffer), _buffer_top(_buffer + BufferLength),
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201 _hr_curr(_hr_buffer),
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202 _closure_app_seconds(0.0) { }
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203 };