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comparison src/share/vm/gc_implementation/g1/g1MarkSweep.cpp @ 1836:894b1d7c7e01

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6423256: GC stacks should use a better data structure 6942771: SEGV in ParScanThreadState::take_from_overflow_stack Reviewed-by: apetrusenko, ysr, pbk
author jcoomes
date Tue, 28 Sep 2010 15:56:15 -0700
parents c18cbe5936b8
children f95d63e2154a
comparison
equal deleted inserted replaced
1835:4805b9f4779e 1836:894b1d7c7e01
99 99
100 void G1MarkSweep::allocate_stacks() { 100 void G1MarkSweep::allocate_stacks() {
101 GenMarkSweep::_preserved_count_max = 0; 101 GenMarkSweep::_preserved_count_max = 0;
102 GenMarkSweep::_preserved_marks = NULL; 102 GenMarkSweep::_preserved_marks = NULL;
103 GenMarkSweep::_preserved_count = 0; 103 GenMarkSweep::_preserved_count = 0;
104 GenMarkSweep::_preserved_mark_stack = NULL;
105 GenMarkSweep::_preserved_oop_stack = NULL;
106
107 GenMarkSweep::_marking_stack =
108 new (ResourceObj::C_HEAP) GrowableArray<oop>(4000, true);
109 GenMarkSweep::_objarray_stack =
110 new (ResourceObj::C_HEAP) GrowableArray<ObjArrayTask>(50, true);
111
112 int size = SystemDictionary::number_of_classes() * 2;
113 GenMarkSweep::_revisit_klass_stack =
114 new (ResourceObj::C_HEAP) GrowableArray<Klass*>(size, true);
115 // (#klass/k)^2 for k ~ 10 appears a better fit, but this will have to do
116 // for now until we have a chance to work out a more optimal setting.
117 GenMarkSweep::_revisit_mdo_stack =
118 new (ResourceObj::C_HEAP) GrowableArray<DataLayout*>(size*2, true);
119
120 } 104 }
121 105
122 void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading, 106 void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading,
123 bool clear_all_softrefs) { 107 bool clear_all_softrefs) {
124 // Recursively traverse all live objects and mark them 108 // Recursively traverse all live objects and mark them
143 &GenMarkSweep::follow_stack_closure, 127 &GenMarkSweep::follow_stack_closure,
144 NULL); 128 NULL);
145 129
146 // Follow system dictionary roots and unload classes 130 // Follow system dictionary roots and unload classes
147 bool purged_class = SystemDictionary::do_unloading(&GenMarkSweep::is_alive); 131 bool purged_class = SystemDictionary::do_unloading(&GenMarkSweep::is_alive);
148 assert(GenMarkSweep::_marking_stack->is_empty(), 132 assert(GenMarkSweep::_marking_stack.is_empty(),
149 "stack should be empty by now"); 133 "stack should be empty by now");
150 134
151 // Follow code cache roots (has to be done after system dictionary, 135 // Follow code cache roots (has to be done after system dictionary,
152 // assumes all live klasses are marked) 136 // assumes all live klasses are marked)
153 CodeCache::do_unloading(&GenMarkSweep::is_alive, 137 CodeCache::do_unloading(&GenMarkSweep::is_alive,
155 purged_class); 139 purged_class);
156 GenMarkSweep::follow_stack(); 140 GenMarkSweep::follow_stack();
157 141
158 // Update subklass/sibling/implementor links of live klasses 142 // Update subklass/sibling/implementor links of live klasses
159 GenMarkSweep::follow_weak_klass_links(); 143 GenMarkSweep::follow_weak_klass_links();
160 assert(GenMarkSweep::_marking_stack->is_empty(), 144 assert(GenMarkSweep::_marking_stack.is_empty(),
161 "stack should be empty by now"); 145 "stack should be empty by now");
162 146
163 // Visit memoized MDO's and clear any unmarked weak refs 147 // Visit memoized MDO's and clear any unmarked weak refs
164 GenMarkSweep::follow_mdo_weak_refs(); 148 GenMarkSweep::follow_mdo_weak_refs();
165 assert(GenMarkSweep::_marking_stack->is_empty(), "just drained"); 149 assert(GenMarkSweep::_marking_stack.is_empty(), "just drained");
166 150
167 151
168 // Visit symbol and interned string tables and delete unmarked oops 152 // Visit symbol and interned string tables and delete unmarked oops
169 SymbolTable::unlink(&GenMarkSweep::is_alive); 153 SymbolTable::unlink(&GenMarkSweep::is_alive);
170 StringTable::unlink(&GenMarkSweep::is_alive); 154 StringTable::unlink(&GenMarkSweep::is_alive);
171 155
172 assert(GenMarkSweep::_marking_stack->is_empty(), 156 assert(GenMarkSweep::_marking_stack.is_empty(),
173 "stack should be empty by now"); 157 "stack should be empty by now");
174 } 158 }
175 159
176 class G1PrepareCompactClosure: public HeapRegionClosure { 160 class G1PrepareCompactClosure: public HeapRegionClosure {
177 ModRefBarrierSet* _mrbs; 161 ModRefBarrierSet* _mrbs;