42 #include "memory/allocation.inline.hpp" |
42 #include "memory/allocation.inline.hpp" |
43 #include "memory/universe.hpp" |
43 #include "memory/universe.hpp" |
44 #include "runtime/mutex.hpp" |
44 #include "runtime/mutex.hpp" |
45 #include "services/management.hpp" |
45 #include "services/management.hpp" |
46 #include "utilities/macros.hpp" |
46 #include "utilities/macros.hpp" |
47 #if INCLUDE_JVMCI |
47 |
48 #include "jvmci/jvmci.hpp" |
48 void G1RootProcessor::worker_has_discovered_all_strong_nmethods() { |
49 #endif |
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50 |
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51 void G1RootProcessor::worker_has_discovered_all_strong_classes() { |
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52 assert(ClassUnloadingWithConcurrentMark, "Currently only needed when doing G1 Class Unloading"); |
49 assert(ClassUnloadingWithConcurrentMark, "Currently only needed when doing G1 Class Unloading"); |
53 |
50 |
54 uint new_value = (uint)Atomic::add(1, &_n_workers_discovered_strong_classes); |
51 uint new_value = (uint)Atomic::add(1, &_n_workers_discovered_strong_classes); |
55 if (new_value == n_workers()) { |
52 if (new_value == n_workers()) { |
56 // This thread is last. Notify the others. |
53 // This thread is last. Notify the others. |
57 MonitorLocker ml(&_lock, Mutex::_no_safepoint_check_flag); |
54 MonitorLocker ml(&_lock, Mutex::_no_safepoint_check_flag); |
58 _lock.notify_all(); |
55 _lock.notify_all(); |
59 } |
56 } |
60 } |
57 } |
61 |
58 |
62 void G1RootProcessor::wait_until_all_strong_classes_discovered() { |
59 void G1RootProcessor::wait_until_all_strong_nmethods_discovered() { |
63 assert(ClassUnloadingWithConcurrentMark, "Currently only needed when doing G1 Class Unloading"); |
60 assert(ClassUnloadingWithConcurrentMark, "Currently only needed when doing G1 Class Unloading"); |
64 |
61 |
65 if ((uint)_n_workers_discovered_strong_classes != n_workers()) { |
62 if ((uint)_n_workers_discovered_strong_classes != n_workers()) { |
66 MonitorLocker ml(&_lock, Mutex::_no_safepoint_check_flag); |
63 MonitorLocker ml(&_lock, Mutex::_no_safepoint_check_flag); |
67 while ((uint)_n_workers_discovered_strong_classes != n_workers()) { |
64 while ((uint)_n_workers_discovered_strong_classes != n_workers()) { |
72 |
69 |
73 G1RootProcessor::G1RootProcessor(G1CollectedHeap* g1h, uint n_workers) : |
70 G1RootProcessor::G1RootProcessor(G1CollectedHeap* g1h, uint n_workers) : |
74 _g1h(g1h), |
71 _g1h(g1h), |
75 _process_strong_tasks(G1RP_PS_NumElements), |
72 _process_strong_tasks(G1RP_PS_NumElements), |
76 _srs(n_workers), |
73 _srs(n_workers), |
77 _lock(Mutex::leaf, "G1 Root Scanning barrier lock", false, Monitor::_safepoint_check_never), |
74 _lock(Mutex::leaf, "G1 Root Scan barrier lock", false, Mutex::_safepoint_check_never), |
78 _n_workers_discovered_strong_classes(0) {} |
75 _n_workers_discovered_strong_classes(0) {} |
79 |
76 |
80 void G1RootProcessor::evacuate_roots(G1ParScanThreadState* pss, uint worker_i) { |
77 void G1RootProcessor::evacuate_roots(G1ParScanThreadState* pss, uint worker_id) { |
81 G1GCPhaseTimes* phase_times = _g1h->phase_times(); |
78 G1GCPhaseTimes* phase_times = _g1h->phase_times(); |
82 |
79 |
83 G1EvacPhaseTimesTracker timer(phase_times, pss, G1GCPhaseTimes::ExtRootScan, worker_i); |
80 G1EvacPhaseTimesTracker timer(phase_times, pss, G1GCPhaseTimes::ExtRootScan, worker_id); |
84 |
81 |
85 G1EvacuationRootClosures* closures = pss->closures(); |
82 G1EvacuationRootClosures* closures = pss->closures(); |
86 process_java_roots(closures, phase_times, worker_i); |
83 process_java_roots(closures, phase_times, worker_id, closures->trace_metadata() /* notify_claimed_nmethods_done */); |
87 |
84 |
88 // This is the point where this worker thread will not find more strong CLDs/nmethods. |
85 process_vm_roots(closures, phase_times, worker_id); |
89 // Report this so G1 can synchronize the strong and weak CLDs/nmethods processing. |
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90 if (closures->trace_metadata()) { |
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91 worker_has_discovered_all_strong_classes(); |
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92 } |
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93 |
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94 process_vm_roots(closures, phase_times, worker_i); |
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95 |
86 |
96 { |
87 { |
97 // Now the CM ref_processor roots. |
88 // Now the CM ref_processor roots. |
98 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::CMRefRoots, worker_i); |
89 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::CMRefRoots, worker_id); |
99 if (_process_strong_tasks.try_claim_task(G1RP_PS_refProcessor_oops_do)) { |
90 if (_process_strong_tasks.try_claim_task(G1RP_PS_refProcessor_oops_do)) { |
100 // We need to treat the discovered reference lists of the |
91 // We need to treat the discovered reference lists of the |
101 // concurrent mark ref processor as roots and keep entries |
92 // concurrent mark ref processor as roots and keep entries |
102 // (which are added by the marking threads) on them live |
93 // (which are added by the marking threads) on them live |
103 // until they can be processed at the end of marking. |
94 // until they can be processed at the end of marking. |
104 _g1h->ref_processor_cm()->weak_oops_do(closures->strong_oops()); |
95 _g1h->ref_processor_cm()->weak_oops_do(closures->strong_oops()); |
105 } |
96 } |
106 } |
97 } |
107 |
98 |
108 if (closures->trace_metadata()) { |
99 if (closures->trace_metadata()) { |
109 { |
100 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::WaitForStrongRoots, worker_id); |
110 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::WaitForStrongCLD, worker_i); |
101 // Wait to make sure all workers passed the strong nmethods phase. |
111 // Barrier to make sure all workers passed |
102 wait_until_all_strong_nmethods_discovered(); |
112 // the strong CLD and strong nmethods phases. |
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113 wait_until_all_strong_classes_discovered(); |
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114 } |
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115 |
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116 // Now take the complement of the strong CLDs. |
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117 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::WeakCLDRoots, worker_i); |
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118 assert(closures->second_pass_weak_clds() != NULL, "Should be non-null if we are tracing metadata."); |
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119 ClassLoaderDataGraph::roots_cld_do(NULL, closures->second_pass_weak_clds()); |
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120 } else { |
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121 phase_times->record_time_secs(G1GCPhaseTimes::WaitForStrongCLD, worker_i, 0.0); |
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122 phase_times->record_time_secs(G1GCPhaseTimes::WeakCLDRoots, worker_i, 0.0); |
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123 assert(closures->second_pass_weak_clds() == NULL, "Should be null if not tracing metadata."); |
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124 } |
103 } |
125 |
104 |
126 _process_strong_tasks.all_tasks_completed(n_workers()); |
105 _process_strong_tasks.all_tasks_completed(n_workers()); |
127 } |
106 } |
128 |
107 |
190 _process_strong_tasks.all_tasks_completed(n_workers()); |
169 _process_strong_tasks.all_tasks_completed(n_workers()); |
191 } |
170 } |
192 |
171 |
193 void G1RootProcessor::process_java_roots(G1RootClosures* closures, |
172 void G1RootProcessor::process_java_roots(G1RootClosures* closures, |
194 G1GCPhaseTimes* phase_times, |
173 G1GCPhaseTimes* phase_times, |
195 uint worker_i) { |
174 uint worker_id, |
196 // Iterating over the CLDG and the Threads are done early to allow us to |
175 bool notify_claimed_nmethods_done) { |
197 // first process the strong CLDs and nmethods and then, after a barrier, |
176 // We need to make make sure that the "strong" nmethods are processed first |
198 // let the thread process the weak CLDs and nmethods. |
177 // using the strong closure. Only after that we process the weakly reachable |
199 { |
178 // nmethods. |
200 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::CLDGRoots, worker_i); |
179 // We need to strictly separate the strong and weak nmethod processing because |
201 if (_process_strong_tasks.try_claim_task(G1RP_PS_ClassLoaderDataGraph_oops_do)) { |
180 // any processing claims that nmethod, i.e. will not be iterated again. |
202 ClassLoaderDataGraph::roots_cld_do(closures->strong_clds(), closures->weak_clds()); |
181 // Which means if an nmethod is processed first and claimed, the strong processing |
203 } |
182 // will not happen, and the oops reachable by that nmethod will not be marked |
204 } |
183 // properly. |
205 |
184 // |
206 { |
185 // That is why we process strong nmethods first, synchronize all threads via a |
207 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::ThreadRoots, worker_i); |
186 // barrier, and only then allow weak processing. To minimize the wait time at |
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187 // that barrier we do the strong nmethod processing first, and immediately after- |
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188 // wards indicate that that thread is done. Hopefully other root processing after |
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189 // nmethod processing is enough so there is no need to wait. |
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190 // |
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191 // This is only required in the concurrent start pause with class unloading enabled. |
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192 { |
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193 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::ThreadRoots, worker_id); |
208 bool is_par = n_workers() > 1; |
194 bool is_par = n_workers() > 1; |
209 Threads::possibly_parallel_oops_do(is_par, |
195 Threads::possibly_parallel_oops_do(is_par, |
210 closures->strong_oops(), |
196 closures->strong_oops(), |
211 closures->strong_codeblobs()); |
197 closures->strong_codeblobs()); |
212 } |
198 } |
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199 |
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200 // This is the point where this worker thread will not find more strong nmethods. |
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201 // Report this so G1 can synchronize the strong and weak CLDs/nmethods processing. |
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202 if (notify_claimed_nmethods_done) { |
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203 worker_has_discovered_all_strong_nmethods(); |
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204 } |
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205 |
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206 { |
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207 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::CLDGRoots, worker_id); |
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208 if (_process_strong_tasks.try_claim_task(G1RP_PS_ClassLoaderDataGraph_oops_do)) { |
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209 ClassLoaderDataGraph::roots_cld_do(closures->strong_clds(), closures->weak_clds()); |
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210 } |
|
211 } |
213 } |
212 } |
214 |
213 |
215 void G1RootProcessor::process_vm_roots(G1RootClosures* closures, |
214 void G1RootProcessor::process_vm_roots(G1RootClosures* closures, |
216 G1GCPhaseTimes* phase_times, |
215 G1GCPhaseTimes* phase_times, |
217 uint worker_i) { |
216 uint worker_id) { |
218 OopClosure* strong_roots = closures->strong_oops(); |
217 OopClosure* strong_roots = closures->strong_oops(); |
219 |
218 |
220 { |
219 { |
221 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::UniverseRoots, worker_i); |
220 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::UniverseRoots, worker_id); |
222 if (_process_strong_tasks.try_claim_task(G1RP_PS_Universe_oops_do)) { |
221 if (_process_strong_tasks.try_claim_task(G1RP_PS_Universe_oops_do)) { |
223 Universe::oops_do(strong_roots); |
222 Universe::oops_do(strong_roots); |
224 } |
223 } |
225 } |
224 } |
226 |
225 |
227 { |
226 { |
228 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::JNIRoots, worker_i); |
227 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::JNIRoots, worker_id); |
229 if (_process_strong_tasks.try_claim_task(G1RP_PS_JNIHandles_oops_do)) { |
228 if (_process_strong_tasks.try_claim_task(G1RP_PS_JNIHandles_oops_do)) { |
230 JNIHandles::oops_do(strong_roots); |
229 JNIHandles::oops_do(strong_roots); |
231 } |
230 } |
232 } |
231 } |
233 |
232 |
234 { |
233 { |
235 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::ObjectSynchronizerRoots, worker_i); |
234 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::ObjectSynchronizerRoots, worker_id); |
236 if (_process_strong_tasks.try_claim_task(G1RP_PS_ObjectSynchronizer_oops_do)) { |
235 if (_process_strong_tasks.try_claim_task(G1RP_PS_ObjectSynchronizer_oops_do)) { |
237 ObjectSynchronizer::oops_do(strong_roots); |
236 ObjectSynchronizer::oops_do(strong_roots); |
238 } |
237 } |
239 } |
238 } |
240 |
239 |
241 { |
240 { |
242 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::ManagementRoots, worker_i); |
241 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::ManagementRoots, worker_id); |
243 if (_process_strong_tasks.try_claim_task(G1RP_PS_Management_oops_do)) { |
242 if (_process_strong_tasks.try_claim_task(G1RP_PS_Management_oops_do)) { |
244 Management::oops_do(strong_roots); |
243 Management::oops_do(strong_roots); |
245 } |
244 } |
246 } |
245 } |
247 |
246 |
248 { |
247 { |
249 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::JVMTIRoots, worker_i); |
248 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::JVMTIRoots, worker_id); |
250 if (_process_strong_tasks.try_claim_task(G1RP_PS_jvmti_oops_do)) { |
249 if (_process_strong_tasks.try_claim_task(G1RP_PS_jvmti_oops_do)) { |
251 JvmtiExport::oops_do(strong_roots); |
250 JvmtiExport::oops_do(strong_roots); |
252 } |
251 } |
253 } |
252 } |
254 |
253 |
255 #if INCLUDE_AOT |
254 #if INCLUDE_AOT |
256 if (UseAOT) { |
255 if (UseAOT) { |
257 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::AOTCodeRoots, worker_i); |
256 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::AOTCodeRoots, worker_id); |
258 if (_process_strong_tasks.try_claim_task(G1RP_PS_aot_oops_do)) { |
257 if (_process_strong_tasks.try_claim_task(G1RP_PS_aot_oops_do)) { |
259 AOTLoader::oops_do(strong_roots); |
258 AOTLoader::oops_do(strong_roots); |
260 } |
259 } |
261 } |
260 } |
262 #endif |
261 #endif |
263 |
262 |
264 #if INCLUDE_JVMCI |
263 { |
265 if (EnableJVMCI) { |
264 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::SystemDictionaryRoots, worker_id); |
266 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::JVMCIRoots, worker_i); |
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267 if (_process_strong_tasks.try_claim_task(G1RP_PS_JVMCI_oops_do)) { |
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268 JVMCI::oops_do(strong_roots); |
|
269 } |
|
270 } |
|
271 #endif |
|
272 |
|
273 { |
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274 G1GCParPhaseTimesTracker x(phase_times, G1GCPhaseTimes::SystemDictionaryRoots, worker_i); |
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275 if (_process_strong_tasks.try_claim_task(G1RP_PS_SystemDictionary_oops_do)) { |
265 if (_process_strong_tasks.try_claim_task(G1RP_PS_SystemDictionary_oops_do)) { |
276 SystemDictionary::oops_do(strong_roots); |
266 SystemDictionary::oops_do(strong_roots); |
277 } |
267 } |
278 } |
268 } |
279 } |
269 } |
280 |
270 |
281 void G1RootProcessor::process_code_cache_roots(CodeBlobClosure* code_closure, |
271 void G1RootProcessor::process_code_cache_roots(CodeBlobClosure* code_closure, |
282 G1GCPhaseTimes* phase_times, |
272 G1GCPhaseTimes* phase_times, |
283 uint worker_i) { |
273 uint worker_id) { |
284 if (_process_strong_tasks.try_claim_task(G1RP_PS_CodeCache_oops_do)) { |
274 if (_process_strong_tasks.try_claim_task(G1RP_PS_CodeCache_oops_do)) { |
285 CodeCache::blobs_do(code_closure); |
275 CodeCache::blobs_do(code_closure); |
286 } |
276 } |
287 } |
277 } |
288 |
278 |