Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/shared/markSweep.cpp @ 6197:d2a62e0f25eb
6995781: Native Memory Tracking (Phase 1)
7151532: DCmd for hotspot native memory tracking
Summary: Implementation of native memory tracking phase 1, which tracks VM native memory usage, and related DCmd
Reviewed-by: acorn, coleenp, fparain
| author | zgu |
|---|---|
| date | Thu, 28 Jun 2012 17:03:16 -0400 |
| parents | 1d1603768966 |
| children | da91efe96a93 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
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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. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "compiler/compileBroker.hpp" | |
| 27 #include "gc_implementation/shared/markSweep.inline.hpp" | |
| 28 #include "gc_interface/collectedHeap.inline.hpp" | |
| 29 #include "oops/methodDataOop.hpp" | |
| 30 #include "oops/objArrayKlass.inline.hpp" | |
| 31 #include "oops/oop.inline.hpp" | |
| 0 | 32 |
| 6197 | 33 Stack<oop, mtGC> MarkSweep::_marking_stack; |
| 34 Stack<DataLayout*, mtGC> MarkSweep::_revisit_mdo_stack; | |
| 35 Stack<Klass*, mtGC> MarkSweep::_revisit_klass_stack; | |
| 36 Stack<ObjArrayTask, mtGC> MarkSweep::_objarray_stack; | |
| 0 | 37 |
| 6197 | 38 Stack<oop, mtGC> MarkSweep::_preserved_oop_stack; |
| 39 Stack<markOop, mtGC> MarkSweep::_preserved_mark_stack; | |
| 0 | 40 size_t MarkSweep::_preserved_count = 0; |
| 41 size_t MarkSweep::_preserved_count_max = 0; | |
| 42 PreservedMark* MarkSweep::_preserved_marks = NULL; | |
| 43 ReferenceProcessor* MarkSweep::_ref_processor = NULL; | |
| 44 | |
| 45 #ifdef VALIDATE_MARK_SWEEP | |
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46 GrowableArray<void*>* MarkSweep::_root_refs_stack = NULL; |
| 0 | 47 GrowableArray<oop> * MarkSweep::_live_oops = NULL; |
| 48 GrowableArray<oop> * MarkSweep::_live_oops_moved_to = NULL; | |
| 49 GrowableArray<size_t>* MarkSweep::_live_oops_size = NULL; | |
| 50 size_t MarkSweep::_live_oops_index = 0; | |
| 51 size_t MarkSweep::_live_oops_index_at_perm = 0; | |
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52 GrowableArray<void*>* MarkSweep::_other_refs_stack = NULL; |
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53 GrowableArray<void*>* MarkSweep::_adjusted_pointers = NULL; |
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54 bool MarkSweep::_pointer_tracking = false; |
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55 bool MarkSweep::_root_tracking = true; |
| 0 | 56 |
| 57 GrowableArray<HeapWord*>* MarkSweep::_cur_gc_live_oops = NULL; | |
| 58 GrowableArray<HeapWord*>* MarkSweep::_cur_gc_live_oops_moved_to = NULL; | |
| 59 GrowableArray<size_t> * MarkSweep::_cur_gc_live_oops_size = NULL; | |
| 60 GrowableArray<HeapWord*>* MarkSweep::_last_gc_live_oops = NULL; | |
| 61 GrowableArray<HeapWord*>* MarkSweep::_last_gc_live_oops_moved_to = NULL; | |
| 62 GrowableArray<size_t> * MarkSweep::_last_gc_live_oops_size = NULL; | |
| 63 #endif | |
| 64 | |
| 65 void MarkSweep::revisit_weak_klass_link(Klass* k) { | |
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66 _revisit_klass_stack.push(k); |
| 0 | 67 } |
| 68 | |
| 69 void MarkSweep::follow_weak_klass_links() { | |
| 70 // All klasses on the revisit stack are marked at this point. | |
| 71 // Update and follow all subklass, sibling and implementor links. | |
| 941 | 72 if (PrintRevisitStats) { |
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73 gclog_or_tty->print_cr("#classes in system dictionary = %d", |
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74 SystemDictionary::number_of_classes()); |
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75 gclog_or_tty->print_cr("Revisit klass stack size = " SIZE_FORMAT, |
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76 _revisit_klass_stack.size()); |
| 941 | 77 } |
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78 while (!_revisit_klass_stack.is_empty()) { |
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79 Klass* const k = _revisit_klass_stack.pop(); |
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80 k->follow_weak_klass_links(&is_alive, &keep_alive); |
| 0 | 81 } |
| 82 follow_stack(); | |
| 83 } | |
| 84 | |
| 941 | 85 void MarkSweep::revisit_mdo(DataLayout* p) { |
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86 _revisit_mdo_stack.push(p); |
| 941 | 87 } |
| 88 | |
| 89 void MarkSweep::follow_mdo_weak_refs() { | |
| 90 // All strongly reachable oops have been marked at this point; | |
| 91 // we can visit and clear any weak references from MDO's which | |
| 92 // we memoized during the strong marking phase. | |
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93 assert(_marking_stack.is_empty(), "Marking stack should be empty"); |
| 941 | 94 if (PrintRevisitStats) { |
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95 gclog_or_tty->print_cr("#classes in system dictionary = %d", |
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96 SystemDictionary::number_of_classes()); |
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97 gclog_or_tty->print_cr("Revisit MDO stack size = " SIZE_FORMAT, |
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98 _revisit_mdo_stack.size()); |
| 941 | 99 } |
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100 while (!_revisit_mdo_stack.is_empty()) { |
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101 _revisit_mdo_stack.pop()->follow_weak_refs(&is_alive); |
| 941 | 102 } |
| 103 follow_stack(); | |
| 104 } | |
| 105 | |
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106 MarkSweep::FollowRootClosure MarkSweep::follow_root_closure; |
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107 CodeBlobToOopClosure MarkSweep::follow_code_root_closure(&MarkSweep::follow_root_closure, /*do_marking=*/ true); |
| 0 | 108 |
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109 void MarkSweep::FollowRootClosure::do_oop(oop* p) { follow_root(p); } |
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110 void MarkSweep::FollowRootClosure::do_oop(narrowOop* p) { follow_root(p); } |
| 0 | 111 |
| 112 MarkSweep::MarkAndPushClosure MarkSweep::mark_and_push_closure; | |
| 113 | |
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114 void MarkSweep::MarkAndPushClosure::do_oop(oop* p) { assert(*p == NULL || (*p)->is_oop(), ""); mark_and_push(p); } |
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115 void MarkSweep::MarkAndPushClosure::do_oop(narrowOop* p) { mark_and_push(p); } |
| 0 | 116 |
| 117 void MarkSweep::follow_stack() { | |
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118 do { |
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119 while (!_marking_stack.is_empty()) { |
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120 oop obj = _marking_stack.pop(); |
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121 assert (obj->is_gc_marked(), "p must be marked"); |
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122 obj->follow_contents(); |
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123 } |
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124 // Process ObjArrays one at a time to avoid marking stack bloat. |
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125 if (!_objarray_stack.is_empty()) { |
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126 ObjArrayTask task = _objarray_stack.pop(); |
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127 objArrayKlass* const k = (objArrayKlass*)task.obj()->blueprint(); |
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128 k->oop_follow_contents(task.obj(), task.index()); |
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129 } |
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130 } while (!_marking_stack.is_empty() || !_objarray_stack.is_empty()); |
| 0 | 131 } |
| 132 | |
| 133 MarkSweep::FollowStackClosure MarkSweep::follow_stack_closure; | |
| 134 | |
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135 void MarkSweep::FollowStackClosure::do_void() { follow_stack(); } |
| 0 | 136 |
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137 // We preserve the mark which should be replaced at the end and the location |
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138 // that it will go. Note that the object that this markOop belongs to isn't |
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139 // currently at that address but it will be after phase4 |
| 0 | 140 void MarkSweep::preserve_mark(oop obj, markOop mark) { |
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141 // We try to store preserved marks in the to space of the new generation since |
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142 // this is storage which should be available. Most of the time this should be |
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143 // sufficient space for the marks we need to preserve but if it isn't we fall |
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144 // back to using Stacks to keep track of the overflow. |
| 0 | 145 if (_preserved_count < _preserved_count_max) { |
| 146 _preserved_marks[_preserved_count++].init(obj, mark); | |
| 147 } else { | |
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148 _preserved_mark_stack.push(mark); |
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149 _preserved_oop_stack.push(obj); |
| 0 | 150 } |
| 151 } | |
| 152 | |
| 153 MarkSweep::AdjustPointerClosure MarkSweep::adjust_root_pointer_closure(true); | |
| 154 MarkSweep::AdjustPointerClosure MarkSweep::adjust_pointer_closure(false); | |
| 155 | |
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156 void MarkSweep::AdjustPointerClosure::do_oop(oop* p) { adjust_pointer(p, _is_root); } |
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157 void MarkSweep::AdjustPointerClosure::do_oop(narrowOop* p) { adjust_pointer(p, _is_root); } |
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158 |
| 0 | 159 void MarkSweep::adjust_marks() { |
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160 assert( _preserved_oop_stack.size() == _preserved_mark_stack.size(), |
| 0 | 161 "inconsistent preserved oop stacks"); |
| 162 | |
| 163 // adjust the oops we saved earlier | |
| 164 for (size_t i = 0; i < _preserved_count; i++) { | |
| 165 _preserved_marks[i].adjust_pointer(); | |
| 166 } | |
| 167 | |
| 168 // deal with the overflow stack | |
| 6197 | 169 StackIterator<oop, mtGC> iter(_preserved_oop_stack); |
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170 while (!iter.is_empty()) { |
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171 oop* p = iter.next_addr(); |
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172 adjust_pointer(p); |
| 0 | 173 } |
| 174 } | |
| 175 | |
| 176 void MarkSweep::restore_marks() { | |
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177 assert(_preserved_oop_stack.size() == _preserved_mark_stack.size(), |
| 0 | 178 "inconsistent preserved oop stacks"); |
| 179 if (PrintGC && Verbose) { | |
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180 gclog_or_tty->print_cr("Restoring %d marks", |
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181 _preserved_count + _preserved_oop_stack.size()); |
| 0 | 182 } |
| 183 | |
| 184 // restore the marks we saved earlier | |
| 185 for (size_t i = 0; i < _preserved_count; i++) { | |
| 186 _preserved_marks[i].restore(); | |
| 187 } | |
| 188 | |
| 189 // deal with the overflow | |
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190 while (!_preserved_oop_stack.is_empty()) { |
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191 oop obj = _preserved_oop_stack.pop(); |
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192 markOop mark = _preserved_mark_stack.pop(); |
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193 obj->set_mark(mark); |
| 0 | 194 } |
| 195 } | |
| 196 | |
| 197 #ifdef VALIDATE_MARK_SWEEP | |
| 198 | |
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199 void MarkSweep::track_adjusted_pointer(void* p, bool isroot) { |
| 0 | 200 if (!ValidateMarkSweep) |
| 201 return; | |
| 202 | |
| 203 if (!isroot) { | |
| 204 if (_pointer_tracking) { | |
| 205 guarantee(_adjusted_pointers->contains(p), "should have seen this pointer"); | |
| 206 _adjusted_pointers->remove(p); | |
| 207 } | |
| 208 } else { | |
| 209 ptrdiff_t index = _root_refs_stack->find(p); | |
| 210 if (index != -1) { | |
| 211 int l = _root_refs_stack->length(); | |
| 212 if (l > 0 && l - 1 != index) { | |
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213 void* last = _root_refs_stack->pop(); |
| 0 | 214 assert(last != p, "should be different"); |
| 215 _root_refs_stack->at_put(index, last); | |
| 216 } else { | |
| 217 _root_refs_stack->remove(p); | |
| 218 } | |
| 219 } | |
| 220 } | |
| 221 } | |
| 222 | |
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223 void MarkSweep::check_adjust_pointer(void* p) { |
| 0 | 224 _adjusted_pointers->push(p); |
| 225 } | |
| 226 | |
| 227 class AdjusterTracker: public OopClosure { | |
| 228 public: | |
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229 AdjusterTracker() {} |
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230 void do_oop(oop* o) { MarkSweep::check_adjust_pointer(o); } |
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231 void do_oop(narrowOop* o) { MarkSweep::check_adjust_pointer(o); } |
| 0 | 232 }; |
| 233 | |
| 234 void MarkSweep::track_interior_pointers(oop obj) { | |
| 235 if (ValidateMarkSweep) { | |
| 236 _adjusted_pointers->clear(); | |
| 237 _pointer_tracking = true; | |
| 238 | |
| 239 AdjusterTracker checker; | |
| 240 obj->oop_iterate(&checker); | |
| 241 } | |
| 242 } | |
| 243 | |
| 244 void MarkSweep::check_interior_pointers() { | |
| 245 if (ValidateMarkSweep) { | |
| 246 _pointer_tracking = false; | |
| 247 guarantee(_adjusted_pointers->length() == 0, "should have processed the same pointers"); | |
| 248 } | |
| 249 } | |
| 250 | |
| 251 void MarkSweep::reset_live_oop_tracking(bool at_perm) { | |
| 252 if (ValidateMarkSweep) { | |
| 253 guarantee((size_t)_live_oops->length() == _live_oops_index, "should be at end of live oops"); | |
| 254 _live_oops_index = at_perm ? _live_oops_index_at_perm : 0; | |
| 255 } | |
| 256 } | |
| 257 | |
| 258 void MarkSweep::register_live_oop(oop p, size_t size) { | |
| 259 if (ValidateMarkSweep) { | |
| 260 _live_oops->push(p); | |
| 261 _live_oops_size->push(size); | |
| 262 _live_oops_index++; | |
| 263 } | |
| 264 } | |
| 265 | |
| 266 void MarkSweep::validate_live_oop(oop p, size_t size) { | |
| 267 if (ValidateMarkSweep) { | |
| 268 oop obj = _live_oops->at((int)_live_oops_index); | |
| 269 guarantee(obj == p, "should be the same object"); | |
| 270 guarantee(_live_oops_size->at((int)_live_oops_index) == size, "should be the same size"); | |
| 271 _live_oops_index++; | |
| 272 } | |
| 273 } | |
| 274 | |
| 275 void MarkSweep::live_oop_moved_to(HeapWord* q, size_t size, | |
| 276 HeapWord* compaction_top) { | |
| 277 assert(oop(q)->forwardee() == NULL || oop(q)->forwardee() == oop(compaction_top), | |
| 278 "should be moved to forwarded location"); | |
| 279 if (ValidateMarkSweep) { | |
| 280 MarkSweep::validate_live_oop(oop(q), size); | |
| 281 _live_oops_moved_to->push(oop(compaction_top)); | |
| 282 } | |
| 283 if (RecordMarkSweepCompaction) { | |
| 284 _cur_gc_live_oops->push(q); | |
| 285 _cur_gc_live_oops_moved_to->push(compaction_top); | |
| 286 _cur_gc_live_oops_size->push(size); | |
| 287 } | |
| 288 } | |
| 289 | |
| 290 void MarkSweep::compaction_complete() { | |
| 291 if (RecordMarkSweepCompaction) { | |
| 292 GrowableArray<HeapWord*>* _tmp_live_oops = _cur_gc_live_oops; | |
| 293 GrowableArray<HeapWord*>* _tmp_live_oops_moved_to = _cur_gc_live_oops_moved_to; | |
| 294 GrowableArray<size_t> * _tmp_live_oops_size = _cur_gc_live_oops_size; | |
| 295 | |
| 296 _cur_gc_live_oops = _last_gc_live_oops; | |
| 297 _cur_gc_live_oops_moved_to = _last_gc_live_oops_moved_to; | |
| 298 _cur_gc_live_oops_size = _last_gc_live_oops_size; | |
| 299 _last_gc_live_oops = _tmp_live_oops; | |
| 300 _last_gc_live_oops_moved_to = _tmp_live_oops_moved_to; | |
| 301 _last_gc_live_oops_size = _tmp_live_oops_size; | |
| 302 } | |
| 303 } | |
| 304 | |
| 305 void MarkSweep::print_new_location_of_heap_address(HeapWord* q) { | |
| 306 if (!RecordMarkSweepCompaction) { | |
| 307 tty->print_cr("Requires RecordMarkSweepCompaction to be enabled"); | |
| 308 return; | |
| 309 } | |
| 310 | |
| 311 if (_last_gc_live_oops == NULL) { | |
| 312 tty->print_cr("No compaction information gathered yet"); | |
| 313 return; | |
| 314 } | |
| 315 | |
| 316 for (int i = 0; i < _last_gc_live_oops->length(); i++) { | |
| 317 HeapWord* old_oop = _last_gc_live_oops->at(i); | |
| 318 size_t sz = _last_gc_live_oops_size->at(i); | |
| 319 if (old_oop <= q && q < (old_oop + sz)) { | |
| 320 HeapWord* new_oop = _last_gc_live_oops_moved_to->at(i); | |
| 321 size_t offset = (q - old_oop); | |
| 322 tty->print_cr("Address " PTR_FORMAT, q); | |
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323 tty->print_cr(" Was in oop " PTR_FORMAT ", size " SIZE_FORMAT ", at offset " SIZE_FORMAT, old_oop, sz, offset); |
| 0 | 324 tty->print_cr(" Now in oop " PTR_FORMAT ", actual address " PTR_FORMAT, new_oop, new_oop + offset); |
| 325 return; | |
| 326 } | |
| 327 } | |
| 328 | |
| 329 tty->print_cr("Address " PTR_FORMAT " not found in live oop information from last GC", q); | |
| 330 } | |
| 331 #endif //VALIDATE_MARK_SWEEP | |
| 332 | |
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333 MarkSweep::IsAliveClosure MarkSweep::is_alive; |
| 0 | 334 |
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335 void MarkSweep::IsAliveClosure::do_object(oop p) { ShouldNotReachHere(); } |
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336 bool MarkSweep::IsAliveClosure::do_object_b(oop p) { return p->is_gc_marked(); } |
| 0 | 337 |
| 338 MarkSweep::KeepAliveClosure MarkSweep::keep_alive; | |
| 339 | |
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340 void MarkSweep::KeepAliveClosure::do_oop(oop* p) { MarkSweep::KeepAliveClosure::do_oop_work(p); } |
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341 void MarkSweep::KeepAliveClosure::do_oop(narrowOop* p) { MarkSweep::KeepAliveClosure::do_oop_work(p); } |
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342 |
| 0 | 343 void marksweep_init() { /* empty */ } |
| 344 | |
| 345 #ifndef PRODUCT | |
| 346 | |
| 347 void MarkSweep::trace(const char* msg) { | |
| 348 if (TraceMarkSweep) | |
| 349 gclog_or_tty->print("%s", msg); | |
| 350 } | |
| 351 | |
| 352 #endif |