25 #include "precompiled.hpp" |
25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" |
26 #include "classfile/symbolTable.hpp" |
27 #include "classfile/stringTable.hpp" |
27 #include "classfile/stringTable.hpp" |
28 #include "code/codeCache.hpp" |
28 #include "code/codeCache.hpp" |
29 #include "gc/shared/parallelCleaning.hpp" |
29 #include "gc/shared/parallelCleaning.hpp" |
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30 #include "logging/log.hpp" |
30 #include "memory/resourceArea.hpp" |
31 #include "memory/resourceArea.hpp" |
31 #include "logging/log.hpp" |
32 #include "logging/log.hpp" |
32 |
33 |
33 StringCleaningTask::StringCleaningTask(BoolObjectClosure* is_alive, StringDedupUnlinkOrOopsDoClosure* dedup_closure, bool process_strings) : |
34 StringCleaningTask::StringCleaningTask(BoolObjectClosure* is_alive, StringDedupUnlinkOrOopsDoClosure* dedup_closure, bool process_strings) : |
34 AbstractGangTask("String Unlinking"), |
35 AbstractGangTask("String Unlinking"), |
65 StringDedup::parallel_unlink(_dedup_closure, worker_id); |
66 StringDedup::parallel_unlink(_dedup_closure, worker_id); |
66 } |
67 } |
67 } |
68 } |
68 |
69 |
69 CodeCacheUnloadingTask::CodeCacheUnloadingTask(uint num_workers, BoolObjectClosure* is_alive, bool unloading_occurred) : |
70 CodeCacheUnloadingTask::CodeCacheUnloadingTask(uint num_workers, BoolObjectClosure* is_alive, bool unloading_occurred) : |
70 _is_alive(is_alive), |
71 _unloading_scope(is_alive), |
71 _unloading_occurred(unloading_occurred), |
72 _unloading_occurred(unloading_occurred), |
72 _num_workers(num_workers), |
73 _num_workers(num_workers), |
73 _first_nmethod(NULL), |
74 _first_nmethod(NULL), |
74 _claimed_nmethod(NULL), |
75 _claimed_nmethod(NULL) { |
75 _postponed_list(NULL), |
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76 _num_entered_barrier(0) { |
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77 CompiledMethod::increase_unloading_clock(); |
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78 // Get first alive nmethod |
76 // Get first alive nmethod |
79 CompiledMethodIterator iter = CompiledMethodIterator(); |
77 CompiledMethodIterator iter = CompiledMethodIterator(); |
80 if(iter.next_alive()) { |
78 if(iter.next_alive()) { |
81 _first_nmethod = iter.method(); |
79 _first_nmethod = iter.method(); |
82 } |
80 } |
84 } |
82 } |
85 |
83 |
86 CodeCacheUnloadingTask::~CodeCacheUnloadingTask() { |
84 CodeCacheUnloadingTask::~CodeCacheUnloadingTask() { |
87 CodeCache::verify_clean_inline_caches(); |
85 CodeCache::verify_clean_inline_caches(); |
88 |
86 |
89 CodeCache::set_needs_cache_clean(false); |
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90 guarantee(CodeCache::scavenge_root_nmethods() == NULL, "Must be"); |
87 guarantee(CodeCache::scavenge_root_nmethods() == NULL, "Must be"); |
91 |
88 |
92 CodeCache::verify_icholder_relocations(); |
89 CodeCache::verify_icholder_relocations(); |
93 } |
90 } |
94 |
91 |
95 Monitor* CodeCacheUnloadingTask::_lock = new Monitor(Mutex::leaf, "Code Cache Unload lock", false, Monitor::_safepoint_check_never); |
92 Monitor* CodeCacheUnloadingTask::_lock = new Monitor(Mutex::leaf, "Code Cache Unload lock", false, Monitor::_safepoint_check_never); |
96 |
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97 void CodeCacheUnloadingTask::add_to_postponed_list(CompiledMethod* nm) { |
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98 CompiledMethod* old; |
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99 do { |
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100 old = _postponed_list; |
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101 nm->set_unloading_next(old); |
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102 } while (Atomic::cmpxchg(nm, &_postponed_list, old) != old); |
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103 } |
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104 |
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105 void CodeCacheUnloadingTask::clean_nmethod(CompiledMethod* nm) { |
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106 bool postponed = nm->do_unloading_parallel(_is_alive, _unloading_occurred); |
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107 |
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108 if (postponed) { |
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109 // This nmethod referred to an nmethod that has not been cleaned/unloaded yet. |
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110 add_to_postponed_list(nm); |
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111 } |
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112 |
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113 // Mark that this nmethod has been cleaned/unloaded. |
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114 // After this call, it will be safe to ask if this nmethod was unloaded or not. |
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115 nm->set_unloading_clock(CompiledMethod::global_unloading_clock()); |
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116 } |
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117 |
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118 void CodeCacheUnloadingTask::clean_nmethod_postponed(CompiledMethod* nm) { |
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119 nm->do_unloading_parallel_postponed(); |
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120 } |
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121 |
93 |
122 void CodeCacheUnloadingTask::claim_nmethods(CompiledMethod** claimed_nmethods, int *num_claimed_nmethods) { |
94 void CodeCacheUnloadingTask::claim_nmethods(CompiledMethod** claimed_nmethods, int *num_claimed_nmethods) { |
123 CompiledMethod* first; |
95 CompiledMethod* first; |
124 CompiledMethodIterator last; |
96 CompiledMethodIterator last; |
125 |
97 |
141 } |
113 } |
142 |
114 |
143 } while (Atomic::cmpxchg(last.method(), &_claimed_nmethod, first) != first); |
115 } while (Atomic::cmpxchg(last.method(), &_claimed_nmethod, first) != first); |
144 } |
116 } |
145 |
117 |
146 CompiledMethod* CodeCacheUnloadingTask::claim_postponed_nmethod() { |
118 void CodeCacheUnloadingTask::work(uint worker_id) { |
147 CompiledMethod* claim; |
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148 CompiledMethod* next; |
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149 |
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150 do { |
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151 claim = _postponed_list; |
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152 if (claim == NULL) { |
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153 return NULL; |
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154 } |
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155 |
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156 next = claim->unloading_next(); |
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157 |
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158 } while (Atomic::cmpxchg(next, &_postponed_list, claim) != claim); |
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159 |
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160 return claim; |
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161 } |
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162 |
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163 void CodeCacheUnloadingTask::barrier_mark(uint worker_id) { |
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164 MonitorLockerEx ml(_lock, Mutex::_no_safepoint_check_flag); |
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165 _num_entered_barrier++; |
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166 if (_num_entered_barrier == _num_workers) { |
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167 ml.notify_all(); |
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168 } |
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169 } |
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170 |
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171 void CodeCacheUnloadingTask::barrier_wait(uint worker_id) { |
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172 if (_num_entered_barrier < _num_workers) { |
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173 MonitorLockerEx ml(_lock, Mutex::_no_safepoint_check_flag); |
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174 while (_num_entered_barrier < _num_workers) { |
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175 ml.wait(Mutex::_no_safepoint_check_flag, 0, false); |
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176 } |
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177 } |
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178 } |
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179 |
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180 void CodeCacheUnloadingTask::work_first_pass(uint worker_id) { |
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181 // The first nmethods is claimed by the first worker. |
119 // The first nmethods is claimed by the first worker. |
182 if (worker_id == 0 && _first_nmethod != NULL) { |
120 if (worker_id == 0 && _first_nmethod != NULL) { |
183 clean_nmethod(_first_nmethod); |
121 _first_nmethod->do_unloading(_unloading_occurred); |
184 _first_nmethod = NULL; |
122 _first_nmethod = NULL; |
185 } |
123 } |
186 |
124 |
187 int num_claimed_nmethods; |
125 int num_claimed_nmethods; |
188 CompiledMethod* claimed_nmethods[MaxClaimNmethods]; |
126 CompiledMethod* claimed_nmethods[MaxClaimNmethods]; |
193 if (num_claimed_nmethods == 0) { |
131 if (num_claimed_nmethods == 0) { |
194 break; |
132 break; |
195 } |
133 } |
196 |
134 |
197 for (int i = 0; i < num_claimed_nmethods; i++) { |
135 for (int i = 0; i < num_claimed_nmethods; i++) { |
198 clean_nmethod(claimed_nmethods[i]); |
136 claimed_nmethods[i]->do_unloading(_unloading_occurred); |
199 } |
137 } |
200 } |
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201 } |
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202 |
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203 void CodeCacheUnloadingTask::work_second_pass(uint worker_id) { |
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204 CompiledMethod* nm; |
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205 // Take care of postponed nmethods. |
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206 while ((nm = claim_postponed_nmethod()) != NULL) { |
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207 clean_nmethod_postponed(nm); |
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208 } |
138 } |
209 } |
139 } |
210 |
140 |
211 KlassCleaningTask::KlassCleaningTask() : |
141 KlassCleaningTask::KlassCleaningTask() : |
212 _clean_klass_tree_claimed(0), |
142 _clean_klass_tree_claimed(0), |
255 _klass_cleaning_task() { |
185 _klass_cleaning_task() { |
256 } |
186 } |
257 |
187 |
258 // The parallel work done by all worker threads. |
188 // The parallel work done by all worker threads. |
259 void ParallelCleaningTask::work(uint worker_id) { |
189 void ParallelCleaningTask::work(uint worker_id) { |
260 // Do first pass of code cache cleaning. |
190 // Do first pass of code cache cleaning. |
261 _code_cache_task.work_first_pass(worker_id); |
191 _code_cache_task.work(worker_id); |
262 |
192 |
263 // Let the threads mark that the first pass is done. |
193 // Clean the Strings and Symbols. |
264 _code_cache_task.barrier_mark(worker_id); |
194 _string_task.work(worker_id); |
265 |
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266 // Clean the Strings and Symbols. |
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267 _string_task.work(worker_id); |
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268 |
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269 // Wait for all workers to finish the first code cache cleaning pass. |
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270 _code_cache_task.barrier_wait(worker_id); |
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271 |
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272 // Do the second code cache cleaning work, which realize on |
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273 // the liveness information gathered during the first pass. |
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274 _code_cache_task.work_second_pass(worker_id); |
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275 |
195 |
276 // Clean all klasses that were not unloaded. |
196 // Clean all klasses that were not unloaded. |
277 // The weak metadata in klass doesn't need to be |
197 // The weak metadata in klass doesn't need to be |
278 // processed if there was no unloading. |
198 // processed if there was no unloading. |
279 if (_unloading_occurred) { |
199 if (_unloading_occurred) { |