Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parNew/parNewGeneration.cpp @ 20278:2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com
| author | stefank |
|---|---|
| date | Mon, 07 Jul 2014 10:12:40 +0200 |
| parents | 7426d8d76305 |
| children | ee019285a52c |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2001, 2014, 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 "gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp" | |
| 27 #include "gc_implementation/parNew/parNewGeneration.hpp" | |
| 28 #include "gc_implementation/parNew/parOopClosures.inline.hpp" | |
| 29 #include "gc_implementation/shared/adaptiveSizePolicy.hpp" | |
| 30 #include "gc_implementation/shared/ageTable.hpp" | |
| 6595 | 31 #include "gc_implementation/shared/parGCAllocBuffer.hpp" |
| 10405 | 32 #include "gc_implementation/shared/gcHeapSummary.hpp" |
| 33 #include "gc_implementation/shared/gcTimer.hpp" | |
| 34 #include "gc_implementation/shared/gcTrace.hpp" | |
| 35 #include "gc_implementation/shared/gcTraceTime.hpp" | |
| 36 #include "gc_implementation/shared/copyFailedInfo.hpp" | |
| 1972 | 37 #include "gc_implementation/shared/spaceDecorator.hpp" |
| 38 #include "memory/defNewGeneration.inline.hpp" | |
| 39 #include "memory/genCollectedHeap.hpp" | |
| 40 #include "memory/genOopClosures.inline.hpp" | |
| 41 #include "memory/generation.hpp" | |
| 42 #include "memory/generation.inline.hpp" | |
| 43 #include "memory/referencePolicy.hpp" | |
| 44 #include "memory/resourceArea.hpp" | |
| 45 #include "memory/sharedHeap.hpp" | |
| 46 #include "memory/space.hpp" | |
| 47 #include "oops/objArrayOop.hpp" | |
| 48 #include "oops/oop.inline.hpp" | |
| 49 #include "oops/oop.pcgc.inline.hpp" | |
| 50 #include "runtime/handles.hpp" | |
| 51 #include "runtime/handles.inline.hpp" | |
| 52 #include "runtime/java.hpp" | |
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53 #include "runtime/thread.inline.hpp" |
| 1972 | 54 #include "utilities/copy.hpp" |
| 55 #include "utilities/globalDefinitions.hpp" | |
| 56 #include "utilities/workgroup.hpp" | |
| 0 | 57 |
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58 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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59 |
| 0 | 60 #ifdef _MSC_VER |
| 61 #pragma warning( push ) | |
| 62 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 63 #endif | |
| 64 ParScanThreadState::ParScanThreadState(Space* to_space_, | |
| 65 ParNewGeneration* gen_, | |
| 66 Generation* old_gen_, | |
| 67 int thread_num_, | |
| 68 ObjToScanQueueSet* work_queue_set_, | |
| 6197 | 69 Stack<oop, mtGC>* overflow_stacks_, |
| 0 | 70 size_t desired_plab_sz_, |
| 71 ParallelTaskTerminator& term_) : | |
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72 _to_space(to_space_), _old_gen(old_gen_), _young_gen(gen_), _thread_num(thread_num_), |
| 0 | 73 _work_queue(work_queue_set_->queue(thread_num_)), _to_space_full(false), |
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74 _overflow_stack(overflow_stacks_ ? overflow_stacks_ + thread_num_ : NULL), |
| 0 | 75 _ageTable(false), // false ==> not the global age table, no perf data. |
| 76 _to_space_alloc_buffer(desired_plab_sz_), | |
| 77 _to_space_closure(gen_, this), _old_gen_closure(gen_, this), | |
| 78 _to_space_root_closure(gen_, this), _old_gen_root_closure(gen_, this), | |
| 79 _older_gen_closure(gen_, this), | |
| 80 _evacuate_followers(this, &_to_space_closure, &_old_gen_closure, | |
| 81 &_to_space_root_closure, gen_, &_old_gen_root_closure, | |
| 82 work_queue_set_, &term_), | |
| 83 _is_alive_closure(gen_), _scan_weak_ref_closure(gen_, this), | |
| 84 _keep_alive_closure(&_scan_weak_ref_closure), | |
| 85 _strong_roots_time(0.0), _term_time(0.0) | |
| 86 { | |
| 1710 | 87 #if TASKQUEUE_STATS |
| 88 _term_attempts = 0; | |
| 89 _overflow_refills = 0; | |
| 90 _overflow_refill_objs = 0; | |
| 91 #endif // TASKQUEUE_STATS | |
| 92 | |
| 0 | 93 _survivor_chunk_array = |
| 94 (ChunkArray*) old_gen()->get_data_recorder(thread_num()); | |
| 95 _hash_seed = 17; // Might want to take time-based random value. | |
| 96 _start = os::elapsedTime(); | |
| 97 _old_gen_closure.set_generation(old_gen_); | |
| 98 _old_gen_root_closure.set_generation(old_gen_); | |
| 99 } | |
| 100 #ifdef _MSC_VER | |
| 101 #pragma warning( pop ) | |
| 102 #endif | |
| 103 | |
| 104 void ParScanThreadState::record_survivor_plab(HeapWord* plab_start, | |
| 105 size_t plab_word_size) { | |
| 106 ChunkArray* sca = survivor_chunk_array(); | |
| 107 if (sca != NULL) { | |
| 108 // A non-null SCA implies that we want the PLAB data recorded. | |
| 109 sca->record_sample(plab_start, plab_word_size); | |
| 110 } | |
| 111 } | |
| 112 | |
| 113 bool ParScanThreadState::should_be_partially_scanned(oop new_obj, oop old_obj) const { | |
| 114 return new_obj->is_objArray() && | |
| 115 arrayOop(new_obj)->length() > ParGCArrayScanChunk && | |
| 116 new_obj != old_obj; | |
| 117 } | |
| 118 | |
| 119 void ParScanThreadState::scan_partial_array_and_push_remainder(oop old) { | |
| 120 assert(old->is_objArray(), "must be obj array"); | |
| 121 assert(old->is_forwarded(), "must be forwarded"); | |
| 122 assert(Universe::heap()->is_in_reserved(old), "must be in heap."); | |
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123 assert(!old_gen()->is_in(old), "must be in young generation."); |
| 0 | 124 |
| 125 objArrayOop obj = objArrayOop(old->forwardee()); | |
| 126 // Process ParGCArrayScanChunk elements now | |
| 127 // and push the remainder back onto queue | |
| 128 int start = arrayOop(old)->length(); | |
| 129 int end = obj->length(); | |
| 130 int remainder = end - start; | |
| 131 assert(start <= end, "just checking"); | |
| 132 if (remainder > 2 * ParGCArrayScanChunk) { | |
| 133 // Test above combines last partial chunk with a full chunk | |
| 134 end = start + ParGCArrayScanChunk; | |
| 135 arrayOop(old)->set_length(end); | |
| 136 // Push remainder. | |
| 137 bool ok = work_queue()->push(old); | |
| 138 assert(ok, "just popped, push must be okay"); | |
| 139 } else { | |
| 140 // Restore length so that it can be used if there | |
| 141 // is a promotion failure and forwarding pointers | |
| 142 // must be removed. | |
| 143 arrayOop(old)->set_length(end); | |
| 144 } | |
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145 |
| 0 | 146 // process our set of indices (include header in first chunk) |
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147 // should make sure end is even (aligned to HeapWord in case of compressed oops) |
| 0 | 148 if ((HeapWord *)obj < young_old_boundary()) { |
| 149 // object is in to_space | |
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150 obj->oop_iterate_range(&_to_space_closure, start, end); |
| 0 | 151 } else { |
| 152 // object is in old generation | |
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153 obj->oop_iterate_range(&_old_gen_closure, start, end); |
| 0 | 154 } |
| 155 } | |
| 156 | |
| 157 | |
| 158 void ParScanThreadState::trim_queues(int max_size) { | |
| 159 ObjToScanQueue* queue = work_queue(); | |
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160 do { |
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161 while (queue->size() > (juint)max_size) { |
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162 oop obj_to_scan; |
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163 if (queue->pop_local(obj_to_scan)) { |
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164 if ((HeapWord *)obj_to_scan < young_old_boundary()) { |
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165 if (obj_to_scan->is_objArray() && |
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166 obj_to_scan->is_forwarded() && |
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167 obj_to_scan->forwardee() != obj_to_scan) { |
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168 scan_partial_array_and_push_remainder(obj_to_scan); |
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169 } else { |
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170 // object is in to_space |
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171 obj_to_scan->oop_iterate(&_to_space_closure); |
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172 } |
| 0 | 173 } else { |
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174 // object is in old generation |
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175 obj_to_scan->oop_iterate(&_old_gen_closure); |
| 0 | 176 } |
| 177 } | |
| 178 } | |
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179 // For the case of compressed oops, we have a private, non-shared |
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180 // overflow stack, so we eagerly drain it so as to more evenly |
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181 // distribute load early. Note: this may be good to do in |
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182 // general rather than delay for the final stealing phase. |
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183 // If applicable, we'll transfer a set of objects over to our |
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184 // work queue, allowing them to be stolen and draining our |
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185 // private overflow stack. |
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186 } while (ParGCTrimOverflow && young_gen()->take_from_overflow_list(this)); |
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187 } |
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188 |
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189 bool ParScanThreadState::take_from_overflow_stack() { |
| 695 | 190 assert(ParGCUseLocalOverflow, "Else should not call"); |
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191 assert(young_gen()->overflow_list() == NULL, "Error"); |
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192 ObjToScanQueue* queue = work_queue(); |
| 6197 | 193 Stack<oop, mtGC>* const of_stack = overflow_stack(); |
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194 const size_t num_overflow_elems = of_stack->size(); |
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195 const size_t space_available = queue->max_elems() - queue->size(); |
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196 const size_t num_take_elems = MIN3(space_available / 4, |
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197 ParGCDesiredObjsFromOverflowList, |
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198 num_overflow_elems); |
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199 // Transfer the most recent num_take_elems from the overflow |
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200 // stack to our work queue. |
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201 for (size_t i = 0; i != num_take_elems; i++) { |
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202 oop cur = of_stack->pop(); |
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203 oop obj_to_push = cur->forwardee(); |
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204 assert(Universe::heap()->is_in_reserved(cur), "Should be in heap"); |
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205 assert(!old_gen()->is_in_reserved(cur), "Should be in young gen"); |
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206 assert(Universe::heap()->is_in_reserved(obj_to_push), "Should be in heap"); |
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207 if (should_be_partially_scanned(obj_to_push, cur)) { |
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208 assert(arrayOop(cur)->length() == 0, "entire array remaining to be scanned"); |
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209 obj_to_push = cur; |
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210 } |
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211 bool ok = queue->push(obj_to_push); |
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212 assert(ok, "Should have succeeded"); |
| 0 | 213 } |
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214 assert(young_gen()->overflow_list() == NULL, "Error"); |
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215 return num_take_elems > 0; // was something transferred? |
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216 } |
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217 |
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218 void ParScanThreadState::push_on_overflow_stack(oop p) { |
| 695 | 219 assert(ParGCUseLocalOverflow, "Else should not call"); |
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220 overflow_stack()->push(p); |
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221 assert(young_gen()->overflow_list() == NULL, "Error"); |
| 0 | 222 } |
| 223 | |
| 224 HeapWord* ParScanThreadState::alloc_in_to_space_slow(size_t word_sz) { | |
| 225 | |
| 226 // Otherwise, if the object is small enough, try to reallocate the | |
| 227 // buffer. | |
| 228 HeapWord* obj = NULL; | |
| 229 if (!_to_space_full) { | |
| 230 ParGCAllocBuffer* const plab = to_space_alloc_buffer(); | |
| 231 Space* const sp = to_space(); | |
| 232 if (word_sz * 100 < | |
| 233 ParallelGCBufferWastePct * plab->word_sz()) { | |
| 234 // Is small enough; abandon this buffer and start a new one. | |
| 235 plab->retire(false, false); | |
| 236 size_t buf_size = plab->word_sz(); | |
| 237 HeapWord* buf_space = sp->par_allocate(buf_size); | |
| 238 if (buf_space == NULL) { | |
| 239 const size_t min_bytes = | |
| 240 ParGCAllocBuffer::min_size() << LogHeapWordSize; | |
| 241 size_t free_bytes = sp->free(); | |
| 242 while(buf_space == NULL && free_bytes >= min_bytes) { | |
| 243 buf_size = free_bytes >> LogHeapWordSize; | |
| 244 assert(buf_size == (size_t)align_object_size(buf_size), | |
| 245 "Invariant"); | |
| 246 buf_space = sp->par_allocate(buf_size); | |
| 247 free_bytes = sp->free(); | |
| 248 } | |
| 249 } | |
| 250 if (buf_space != NULL) { | |
| 251 plab->set_word_size(buf_size); | |
| 252 plab->set_buf(buf_space); | |
| 253 record_survivor_plab(buf_space, buf_size); | |
| 254 obj = plab->allocate(word_sz); | |
| 255 // Note that we cannot compare buf_size < word_sz below | |
| 256 // because of AlignmentReserve (see ParGCAllocBuffer::allocate()). | |
| 257 assert(obj != NULL || plab->words_remaining() < word_sz, | |
| 258 "Else should have been able to allocate"); | |
| 259 // It's conceivable that we may be able to use the | |
| 260 // buffer we just grabbed for subsequent small requests | |
| 261 // even if not for this one. | |
| 262 } else { | |
| 263 // We're used up. | |
| 264 _to_space_full = true; | |
| 265 } | |
| 266 | |
| 267 } else { | |
| 268 // Too large; allocate the object individually. | |
| 269 obj = sp->par_allocate(word_sz); | |
| 270 } | |
| 271 } | |
| 272 return obj; | |
| 273 } | |
| 274 | |
| 275 | |
| 276 void ParScanThreadState::undo_alloc_in_to_space(HeapWord* obj, | |
| 277 size_t word_sz) { | |
| 278 // Is the alloc in the current alloc buffer? | |
| 279 if (to_space_alloc_buffer()->contains(obj)) { | |
| 280 assert(to_space_alloc_buffer()->contains(obj + word_sz - 1), | |
| 281 "Should contain whole object."); | |
| 282 to_space_alloc_buffer()->undo_allocation(obj, word_sz); | |
| 283 } else { | |
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284 CollectedHeap::fill_with_object(obj, word_sz); |
| 0 | 285 } |
| 286 } | |
| 287 | |
| 10405 | 288 void ParScanThreadState::print_promotion_failure_size() { |
| 289 if (_promotion_failed_info.has_failed() && PrintPromotionFailure) { | |
| 290 gclog_or_tty->print(" (%d: promotion failure size = " SIZE_FORMAT ") ", | |
| 291 _thread_num, _promotion_failed_info.first_size()); | |
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292 } |
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293 } |
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294 |
| 0 | 295 class ParScanThreadStateSet: private ResourceArray { |
| 296 public: | |
| 297 // Initializes states for the specified number of threads; | |
| 298 ParScanThreadStateSet(int num_threads, | |
| 299 Space& to_space, | |
| 300 ParNewGeneration& gen, | |
| 301 Generation& old_gen, | |
| 302 ObjToScanQueueSet& queue_set, | |
| 6197 | 303 Stack<oop, mtGC>* overflow_stacks_, |
| 0 | 304 size_t desired_plab_sz, |
| 305 ParallelTaskTerminator& term); | |
| 1710 | 306 |
| 307 ~ParScanThreadStateSet() { TASKQUEUE_STATS_ONLY(reset_stats()); } | |
| 308 | |
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309 inline ParScanThreadState& thread_state(int i); |
| 1710 | 310 |
| 10405 | 311 void trace_promotion_failed(YoungGCTracer& gc_tracer); |
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312 void reset(int active_workers, bool promotion_failed); |
| 0 | 313 void flush(); |
| 1710 | 314 |
| 315 #if TASKQUEUE_STATS | |
| 316 static void | |
| 317 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 318 void print_termination_stats(outputStream* const st = gclog_or_tty); | |
| 319 static void | |
| 320 print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 321 void print_taskqueue_stats(outputStream* const st = gclog_or_tty); | |
| 322 void reset_stats(); | |
| 323 #endif // TASKQUEUE_STATS | |
| 324 | |
| 0 | 325 private: |
| 326 ParallelTaskTerminator& _term; | |
| 327 ParNewGeneration& _gen; | |
| 328 Generation& _next_gen; | |
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329 public: |
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330 bool is_valid(int id) const { return id < length(); } |
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331 ParallelTaskTerminator* terminator() { return &_term; } |
| 0 | 332 }; |
| 333 | |
| 334 | |
| 335 ParScanThreadStateSet::ParScanThreadStateSet( | |
| 336 int num_threads, Space& to_space, ParNewGeneration& gen, | |
| 337 Generation& old_gen, ObjToScanQueueSet& queue_set, | |
| 6197 | 338 Stack<oop, mtGC>* overflow_stacks, |
| 0 | 339 size_t desired_plab_sz, ParallelTaskTerminator& term) |
| 340 : ResourceArray(sizeof(ParScanThreadState), num_threads), | |
| 1710 | 341 _gen(gen), _next_gen(old_gen), _term(term) |
| 0 | 342 { |
| 343 assert(num_threads > 0, "sanity check!"); | |
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344 assert(ParGCUseLocalOverflow == (overflow_stacks != NULL), |
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345 "overflow_stack allocation mismatch"); |
| 0 | 346 // Initialize states. |
| 347 for (int i = 0; i < num_threads; ++i) { | |
| 348 new ((ParScanThreadState*)_data + i) | |
| 349 ParScanThreadState(&to_space, &gen, &old_gen, i, &queue_set, | |
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350 overflow_stacks, desired_plab_sz, term); |
| 0 | 351 } |
| 352 } | |
| 353 | |
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354 inline ParScanThreadState& ParScanThreadStateSet::thread_state(int i) |
| 0 | 355 { |
| 356 assert(i >= 0 && i < length(), "sanity check!"); | |
| 357 return ((ParScanThreadState*)_data)[i]; | |
| 358 } | |
| 359 | |
| 10405 | 360 void ParScanThreadStateSet::trace_promotion_failed(YoungGCTracer& gc_tracer) { |
| 361 for (int i = 0; i < length(); ++i) { | |
| 362 if (thread_state(i).promotion_failed()) { | |
| 363 gc_tracer.report_promotion_failed(thread_state(i).promotion_failed_info()); | |
| 364 thread_state(i).promotion_failed_info().reset(); | |
| 365 } | |
| 366 } | |
| 367 } | |
| 0 | 368 |
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369 void ParScanThreadStateSet::reset(int active_threads, bool promotion_failed) |
| 0 | 370 { |
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371 _term.reset_for_reuse(active_threads); |
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372 if (promotion_failed) { |
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373 for (int i = 0; i < length(); ++i) { |
| 10405 | 374 thread_state(i).print_promotion_failure_size(); |
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375 } |
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376 } |
| 0 | 377 } |
| 378 | |
| 1710 | 379 #if TASKQUEUE_STATS |
| 380 void | |
| 381 ParScanThreadState::reset_stats() | |
| 382 { | |
| 383 taskqueue_stats().reset(); | |
| 384 _term_attempts = 0; | |
| 385 _overflow_refills = 0; | |
| 386 _overflow_refill_objs = 0; | |
| 387 } | |
| 388 | |
| 389 void ParScanThreadStateSet::reset_stats() | |
| 390 { | |
| 391 for (int i = 0; i < length(); ++i) { | |
| 392 thread_state(i).reset_stats(); | |
| 393 } | |
| 394 } | |
| 395 | |
| 396 void | |
| 397 ParScanThreadStateSet::print_termination_stats_hdr(outputStream* const st) | |
| 398 { | |
| 399 st->print_raw_cr("GC Termination Stats"); | |
| 400 st->print_raw_cr(" elapsed --strong roots-- " | |
| 401 "-------termination-------"); | |
| 402 st->print_raw_cr("thr ms ms % " | |
| 403 " ms % attempts"); | |
| 404 st->print_raw_cr("--- --------- --------- ------ " | |
| 405 "--------- ------ --------"); | |
| 406 } | |
| 407 | |
| 408 void ParScanThreadStateSet::print_termination_stats(outputStream* const st) | |
| 409 { | |
| 410 print_termination_stats_hdr(st); | |
| 411 | |
| 412 for (int i = 0; i < length(); ++i) { | |
| 413 const ParScanThreadState & pss = thread_state(i); | |
| 414 const double elapsed_ms = pss.elapsed_time() * 1000.0; | |
| 415 const double s_roots_ms = pss.strong_roots_time() * 1000.0; | |
| 416 const double term_ms = pss.term_time() * 1000.0; | |
| 417 st->print_cr("%3d %9.2f %9.2f %6.2f " | |
| 418 "%9.2f %6.2f " SIZE_FORMAT_W(8), | |
| 419 i, elapsed_ms, s_roots_ms, s_roots_ms * 100 / elapsed_ms, | |
| 420 term_ms, term_ms * 100 / elapsed_ms, pss.term_attempts()); | |
| 421 } | |
| 422 } | |
| 423 | |
| 424 // Print stats related to work queue activity. | |
| 425 void ParScanThreadStateSet::print_taskqueue_stats_hdr(outputStream* const st) | |
| 426 { | |
| 427 st->print_raw_cr("GC Task Stats"); | |
| 428 st->print_raw("thr "); TaskQueueStats::print_header(1, st); st->cr(); | |
| 429 st->print_raw("--- "); TaskQueueStats::print_header(2, st); st->cr(); | |
| 430 } | |
| 431 | |
| 432 void ParScanThreadStateSet::print_taskqueue_stats(outputStream* const st) | |
| 433 { | |
| 434 print_taskqueue_stats_hdr(st); | |
| 435 | |
| 436 TaskQueueStats totals; | |
| 437 for (int i = 0; i < length(); ++i) { | |
| 438 const ParScanThreadState & pss = thread_state(i); | |
| 439 const TaskQueueStats & stats = pss.taskqueue_stats(); | |
| 440 st->print("%3d ", i); stats.print(st); st->cr(); | |
| 441 totals += stats; | |
| 442 | |
| 443 if (pss.overflow_refills() > 0) { | |
| 444 st->print_cr(" " SIZE_FORMAT_W(10) " overflow refills " | |
| 445 SIZE_FORMAT_W(10) " overflow objects", | |
| 446 pss.overflow_refills(), pss.overflow_refill_objs()); | |
| 447 } | |
| 448 } | |
| 449 st->print("tot "); totals.print(st); st->cr(); | |
| 450 | |
| 451 DEBUG_ONLY(totals.verify()); | |
| 452 } | |
| 453 #endif // TASKQUEUE_STATS | |
| 454 | |
| 0 | 455 void ParScanThreadStateSet::flush() |
| 456 { | |
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457 // Work in this loop should be kept as lightweight as |
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458 // possible since this might otherwise become a bottleneck |
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459 // to scaling. Should we add heavy-weight work into this |
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460 // loop, consider parallelizing the loop into the worker threads. |
| 0 | 461 for (int i = 0; i < length(); ++i) { |
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462 ParScanThreadState& par_scan_state = thread_state(i); |
| 0 | 463 |
| 464 // Flush stats related to To-space PLAB activity and | |
| 465 // retire the last buffer. | |
| 466 par_scan_state.to_space_alloc_buffer()-> | |
| 467 flush_stats_and_retire(_gen.plab_stats(), | |
| 6595 | 468 true /* end_of_gc */, |
| 469 false /* retain */); | |
| 0 | 470 |
| 471 // Every thread has its own age table. We need to merge | |
| 472 // them all into one. | |
| 473 ageTable *local_table = par_scan_state.age_table(); | |
| 474 _gen.age_table()->merge(local_table); | |
| 475 | |
| 476 // Inform old gen that we're done. | |
| 477 _next_gen.par_promote_alloc_done(i); | |
| 478 _next_gen.par_oop_since_save_marks_iterate_done(i); | |
| 1710 | 479 } |
| 0 | 480 |
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481 if (UseConcMarkSweepGC && ParallelGCThreads > 0) { |
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482 // We need to call this even when ResizeOldPLAB is disabled |
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483 // so as to avoid breaking some asserts. While we may be able |
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484 // to avoid this by reorganizing the code a bit, I am loathe |
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485 // to do that unless we find cases where ergo leads to bad |
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486 // performance. |
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487 CFLS_LAB::compute_desired_plab_size(); |
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488 } |
| 0 | 489 } |
| 490 | |
| 491 ParScanClosure::ParScanClosure(ParNewGeneration* g, | |
| 492 ParScanThreadState* par_scan_state) : | |
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493 OopsInKlassOrGenClosure(g), _par_scan_state(par_scan_state), _g(g) |
| 0 | 494 { |
| 495 assert(_g->level() == 0, "Optimized for youngest generation"); | |
| 496 _boundary = _g->reserved().end(); | |
| 497 } | |
| 498 | |
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499 void ParScanWithBarrierClosure::do_oop(oop* p) { ParScanClosure::do_oop_work(p, true, false); } |
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500 void ParScanWithBarrierClosure::do_oop(narrowOop* p) { ParScanClosure::do_oop_work(p, true, false); } |
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501 |
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502 void ParScanWithoutBarrierClosure::do_oop(oop* p) { ParScanClosure::do_oop_work(p, false, false); } |
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503 void ParScanWithoutBarrierClosure::do_oop(narrowOop* p) { ParScanClosure::do_oop_work(p, false, false); } |
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504 |
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505 void ParRootScanWithBarrierTwoGensClosure::do_oop(oop* p) { ParScanClosure::do_oop_work(p, true, true); } |
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506 void ParRootScanWithBarrierTwoGensClosure::do_oop(narrowOop* p) { ParScanClosure::do_oop_work(p, true, true); } |
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507 |
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508 void ParRootScanWithoutBarrierClosure::do_oop(oop* p) { ParScanClosure::do_oop_work(p, false, true); } |
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509 void ParRootScanWithoutBarrierClosure::do_oop(narrowOop* p) { ParScanClosure::do_oop_work(p, false, true); } |
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510 |
| 0 | 511 ParScanWeakRefClosure::ParScanWeakRefClosure(ParNewGeneration* g, |
| 512 ParScanThreadState* par_scan_state) | |
| 513 : ScanWeakRefClosure(g), _par_scan_state(par_scan_state) | |
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514 {} |
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515 |
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516 void ParScanWeakRefClosure::do_oop(oop* p) { ParScanWeakRefClosure::do_oop_work(p); } |
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517 void ParScanWeakRefClosure::do_oop(narrowOop* p) { ParScanWeakRefClosure::do_oop_work(p); } |
| 0 | 518 |
| 519 #ifdef WIN32 | |
| 520 #pragma warning(disable: 4786) /* identifier was truncated to '255' characters in the browser information */ | |
| 521 #endif | |
| 522 | |
| 523 ParEvacuateFollowersClosure::ParEvacuateFollowersClosure( | |
| 524 ParScanThreadState* par_scan_state_, | |
| 525 ParScanWithoutBarrierClosure* to_space_closure_, | |
| 526 ParScanWithBarrierClosure* old_gen_closure_, | |
| 527 ParRootScanWithoutBarrierClosure* to_space_root_closure_, | |
| 528 ParNewGeneration* par_gen_, | |
| 529 ParRootScanWithBarrierTwoGensClosure* old_gen_root_closure_, | |
| 530 ObjToScanQueueSet* task_queues_, | |
| 531 ParallelTaskTerminator* terminator_) : | |
| 532 | |
| 533 _par_scan_state(par_scan_state_), | |
| 534 _to_space_closure(to_space_closure_), | |
| 535 _old_gen_closure(old_gen_closure_), | |
| 536 _to_space_root_closure(to_space_root_closure_), | |
| 537 _old_gen_root_closure(old_gen_root_closure_), | |
| 538 _par_gen(par_gen_), | |
| 539 _task_queues(task_queues_), | |
| 540 _terminator(terminator_) | |
| 541 {} | |
| 542 | |
| 543 void ParEvacuateFollowersClosure::do_void() { | |
| 544 ObjToScanQueue* work_q = par_scan_state()->work_queue(); | |
| 545 | |
| 546 while (true) { | |
| 547 | |
| 548 // Scan to-space and old-gen objs until we run out of both. | |
| 549 oop obj_to_scan; | |
| 550 par_scan_state()->trim_queues(0); | |
| 551 | |
| 552 // We have no local work, attempt to steal from other threads. | |
| 553 | |
| 554 // attempt to steal work from promoted. | |
| 555 if (task_queues()->steal(par_scan_state()->thread_num(), | |
| 556 par_scan_state()->hash_seed(), | |
| 557 obj_to_scan)) { | |
| 558 bool res = work_q->push(obj_to_scan); | |
| 559 assert(res, "Empty queue should have room for a push."); | |
| 560 | |
| 561 // if successful, goto Start. | |
| 562 continue; | |
| 563 | |
| 564 // try global overflow list. | |
| 565 } else if (par_gen()->take_from_overflow_list(par_scan_state())) { | |
| 566 continue; | |
| 567 } | |
| 568 | |
| 569 // Otherwise, offer termination. | |
| 570 par_scan_state()->start_term_time(); | |
| 571 if (terminator()->offer_termination()) break; | |
| 572 par_scan_state()->end_term_time(); | |
| 573 } | |
| 534 | 574 assert(par_gen()->_overflow_list == NULL && par_gen()->_num_par_pushes == 0, |
| 575 "Broken overflow list?"); | |
| 0 | 576 // Finish the last termination pause. |
| 577 par_scan_state()->end_term_time(); | |
| 578 } | |
| 579 | |
| 580 ParNewGenTask::ParNewGenTask(ParNewGeneration* gen, Generation* next_gen, | |
| 581 HeapWord* young_old_boundary, ParScanThreadStateSet* state_set) : | |
| 582 AbstractGangTask("ParNewGeneration collection"), | |
| 583 _gen(gen), _next_gen(next_gen), | |
| 584 _young_old_boundary(young_old_boundary), | |
| 585 _state_set(state_set) | |
| 586 {} | |
| 587 | |
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588 // Reset the terminator for the given number of |
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589 // active threads. |
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590 void ParNewGenTask::set_for_termination(int active_workers) { |
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591 _state_set->reset(active_workers, _gen->promotion_failed()); |
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592 // Should the heap be passed in? There's only 1 for now so |
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593 // grab it instead. |
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594 GenCollectedHeap* gch = GenCollectedHeap::heap(); |
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595 gch->set_n_termination(active_workers); |
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596 } |
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597 |
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598 void ParNewGenTask::work(uint worker_id) { |
| 0 | 599 GenCollectedHeap* gch = GenCollectedHeap::heap(); |
| 600 // Since this is being done in a separate thread, need new resource | |
| 601 // and handle marks. | |
| 602 ResourceMark rm; | |
| 603 HandleMark hm; | |
| 604 // We would need multiple old-gen queues otherwise. | |
|
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605 assert(gch->n_gens() == 2, "Par young collection currently only works with one older gen."); |
| 0 | 606 |
| 607 Generation* old_gen = gch->next_gen(_gen); | |
| 608 | |
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609 ParScanThreadState& par_scan_state = _state_set->thread_state(worker_id); |
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610 assert(_state_set->is_valid(worker_id), "Should not have been called"); |
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611 |
| 0 | 612 par_scan_state.set_young_old_boundary(_young_old_boundary); |
| 613 | |
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614 KlassScanClosure klass_scan_closure(&par_scan_state.to_space_root_closure(), |
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615 gch->rem_set()->klass_rem_set()); |
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616 CLDToKlassAndOopClosure cld_scan_closure(&klass_scan_closure, |
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617 &par_scan_state.to_space_root_closure(), |
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618 false); |
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619 |
| 0 | 620 par_scan_state.start_strong_roots(); |
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621 gch->gen_process_roots(_gen->level(), |
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622 true, // Process younger gens, if any, |
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623 // as strong roots. |
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624 false, // no scope; this is parallel code |
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625 SharedHeap::SO_ScavengeCodeCache, |
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626 GenCollectedHeap::StrongAndWeakRoots, |
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627 &par_scan_state.to_space_root_closure(), |
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628 &par_scan_state.older_gen_closure(), |
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629 &cld_scan_closure); |
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630 |
| 0 | 631 par_scan_state.end_strong_roots(); |
| 632 | |
| 633 // "evacuate followers". | |
| 634 par_scan_state.evacuate_followers_closure().do_void(); | |
| 635 } | |
| 636 | |
| 637 #ifdef _MSC_VER | |
| 638 #pragma warning( push ) | |
| 639 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 640 #endif | |
| 641 ParNewGeneration:: | |
| 642 ParNewGeneration(ReservedSpace rs, size_t initial_byte_size, int level) | |
| 643 : DefNewGeneration(rs, initial_byte_size, level, "PCopy"), | |
| 644 _overflow_list(NULL), | |
| 645 _is_alive_closure(this), | |
| 646 _plab_stats(YoungPLABSize, PLABWeight) | |
| 647 { | |
| 534 | 648 NOT_PRODUCT(_overflow_counter = ParGCWorkQueueOverflowInterval;) |
| 649 NOT_PRODUCT(_num_par_pushes = 0;) | |
| 0 | 650 _task_queues = new ObjToScanQueueSet(ParallelGCThreads); |
| 651 guarantee(_task_queues != NULL, "task_queues allocation failure."); | |
| 652 | |
| 653 for (uint i1 = 0; i1 < ParallelGCThreads; i1++) { | |
| 1665 | 654 ObjToScanQueue *q = new ObjToScanQueue(); |
| 655 guarantee(q != NULL, "work_queue Allocation failure."); | |
| 656 _task_queues->register_queue(i1, q); | |
| 0 | 657 } |
| 658 | |
| 659 for (uint i2 = 0; i2 < ParallelGCThreads; i2++) | |
| 660 _task_queues->queue(i2)->initialize(); | |
| 661 | |
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662 _overflow_stacks = NULL; |
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663 if (ParGCUseLocalOverflow) { |
| 6197 | 664 |
| 665 // typedef to workaround NEW_C_HEAP_ARRAY macro, which can not deal | |
| 666 // with ',' | |
| 667 typedef Stack<oop, mtGC> GCOopStack; | |
| 668 | |
| 669 _overflow_stacks = NEW_C_HEAP_ARRAY(GCOopStack, ParallelGCThreads, mtGC); | |
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670 for (size_t i = 0; i < ParallelGCThreads; ++i) { |
| 6197 | 671 new (_overflow_stacks + i) Stack<oop, mtGC>(); |
| 695 | 672 } |
| 673 } | |
| 674 | |
| 0 | 675 if (UsePerfData) { |
| 676 EXCEPTION_MARK; | |
| 677 ResourceMark rm; | |
| 678 | |
| 679 const char* cname = | |
| 680 PerfDataManager::counter_name(_gen_counters->name_space(), "threads"); | |
| 681 PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_None, | |
| 682 ParallelGCThreads, CHECK); | |
| 683 } | |
| 684 } | |
| 685 #ifdef _MSC_VER | |
| 686 #pragma warning( pop ) | |
| 687 #endif | |
| 688 | |
| 689 // ParNewGeneration:: | |
| 690 ParKeepAliveClosure::ParKeepAliveClosure(ParScanWeakRefClosure* cl) : | |
| 691 DefNewGeneration::KeepAliveClosure(cl), _par_cl(cl) {} | |
| 692 | |
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693 template <class T> |
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694 void /*ParNewGeneration::*/ParKeepAliveClosure::do_oop_work(T* p) { |
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695 #ifdef ASSERT |
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696 { |
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697 assert(!oopDesc::is_null(*p), "expected non-null ref"); |
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698 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
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699 // We never expect to see a null reference being processed |
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700 // as a weak reference. |
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701 assert(obj->is_oop(), "expected an oop while scanning weak refs"); |
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702 } |
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703 #endif // ASSERT |
| 0 | 704 |
| 705 _par_cl->do_oop_nv(p); | |
| 706 | |
| 707 if (Universe::heap()->is_in_reserved(p)) { | |
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708 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
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709 _rs->write_ref_field_gc_par(p, obj); |
| 0 | 710 } |
| 711 } | |
| 712 | |
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713 void /*ParNewGeneration::*/ParKeepAliveClosure::do_oop(oop* p) { ParKeepAliveClosure::do_oop_work(p); } |
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714 void /*ParNewGeneration::*/ParKeepAliveClosure::do_oop(narrowOop* p) { ParKeepAliveClosure::do_oop_work(p); } |
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715 |
| 0 | 716 // ParNewGeneration:: |
| 717 KeepAliveClosure::KeepAliveClosure(ScanWeakRefClosure* cl) : | |
| 718 DefNewGeneration::KeepAliveClosure(cl) {} | |
| 719 | |
|
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720 template <class T> |
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721 void /*ParNewGeneration::*/KeepAliveClosure::do_oop_work(T* p) { |
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722 #ifdef ASSERT |
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723 { |
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724 assert(!oopDesc::is_null(*p), "expected non-null ref"); |
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725 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
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726 // We never expect to see a null reference being processed |
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727 // as a weak reference. |
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728 assert(obj->is_oop(), "expected an oop while scanning weak refs"); |
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729 } |
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730 #endif // ASSERT |
| 0 | 731 |
| 732 _cl->do_oop_nv(p); | |
| 733 | |
| 734 if (Universe::heap()->is_in_reserved(p)) { | |
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735 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
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736 _rs->write_ref_field_gc_par(p, obj); |
| 0 | 737 } |
| 738 } | |
| 739 | |
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740 void /*ParNewGeneration::*/KeepAliveClosure::do_oop(oop* p) { KeepAliveClosure::do_oop_work(p); } |
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741 void /*ParNewGeneration::*/KeepAliveClosure::do_oop(narrowOop* p) { KeepAliveClosure::do_oop_work(p); } |
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742 |
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743 template <class T> void ScanClosureWithParBarrier::do_oop_work(T* p) { |
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744 T heap_oop = oopDesc::load_heap_oop(p); |
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745 if (!oopDesc::is_null(heap_oop)) { |
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746 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| 0 | 747 if ((HeapWord*)obj < _boundary) { |
| 748 assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?"); | |
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749 oop new_obj = obj->is_forwarded() |
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750 ? obj->forwardee() |
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751 : _g->DefNewGeneration::copy_to_survivor_space(obj); |
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752 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
| 0 | 753 } |
| 754 if (_gc_barrier) { | |
| 755 // If p points to a younger generation, mark the card. | |
| 756 if ((HeapWord*)obj < _gen_boundary) { | |
| 757 _rs->write_ref_field_gc_par(p, obj); | |
| 758 } | |
| 759 } | |
| 760 } | |
| 761 } | |
| 762 | |
|
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763 void ScanClosureWithParBarrier::do_oop(oop* p) { ScanClosureWithParBarrier::do_oop_work(p); } |
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764 void ScanClosureWithParBarrier::do_oop(narrowOop* p) { ScanClosureWithParBarrier::do_oop_work(p); } |
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765 |
| 0 | 766 class ParNewRefProcTaskProxy: public AbstractGangTask { |
| 767 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; | |
| 768 public: | |
| 769 ParNewRefProcTaskProxy(ProcessTask& task, ParNewGeneration& gen, | |
| 770 Generation& next_gen, | |
| 771 HeapWord* young_old_boundary, | |
| 772 ParScanThreadStateSet& state_set); | |
| 773 | |
| 774 private: | |
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775 virtual void work(uint worker_id); |
|
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776 virtual void set_for_termination(int active_workers) { |
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777 _state_set.terminator()->reset_for_reuse(active_workers); |
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778 } |
| 0 | 779 private: |
| 780 ParNewGeneration& _gen; | |
| 781 ProcessTask& _task; | |
| 782 Generation& _next_gen; | |
| 783 HeapWord* _young_old_boundary; | |
| 784 ParScanThreadStateSet& _state_set; | |
| 785 }; | |
| 786 | |
| 787 ParNewRefProcTaskProxy::ParNewRefProcTaskProxy( | |
| 788 ProcessTask& task, ParNewGeneration& gen, | |
| 789 Generation& next_gen, | |
| 790 HeapWord* young_old_boundary, | |
| 791 ParScanThreadStateSet& state_set) | |
| 792 : AbstractGangTask("ParNewGeneration parallel reference processing"), | |
| 793 _gen(gen), | |
| 794 _task(task), | |
| 795 _next_gen(next_gen), | |
| 796 _young_old_boundary(young_old_boundary), | |
| 797 _state_set(state_set) | |
| 798 { | |
| 799 } | |
| 800 | |
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801 void ParNewRefProcTaskProxy::work(uint worker_id) |
| 0 | 802 { |
| 803 ResourceMark rm; | |
| 804 HandleMark hm; | |
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805 ParScanThreadState& par_scan_state = _state_set.thread_state(worker_id); |
| 0 | 806 par_scan_state.set_young_old_boundary(_young_old_boundary); |
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807 _task.work(worker_id, par_scan_state.is_alive_closure(), |
| 0 | 808 par_scan_state.keep_alive_closure(), |
| 809 par_scan_state.evacuate_followers_closure()); | |
| 810 } | |
| 811 | |
| 812 class ParNewRefEnqueueTaskProxy: public AbstractGangTask { | |
| 813 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; | |
| 814 EnqueueTask& _task; | |
| 815 | |
| 816 public: | |
| 817 ParNewRefEnqueueTaskProxy(EnqueueTask& task) | |
| 818 : AbstractGangTask("ParNewGeneration parallel reference enqueue"), | |
| 819 _task(task) | |
| 820 { } | |
| 821 | |
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822 virtual void work(uint worker_id) |
| 0 | 823 { |
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824 _task.work(worker_id); |
| 0 | 825 } |
| 826 }; | |
| 827 | |
| 828 | |
| 829 void ParNewRefProcTaskExecutor::execute(ProcessTask& task) | |
| 830 { | |
| 831 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 832 assert(gch->kind() == CollectedHeap::GenCollectedHeap, | |
| 833 "not a generational heap"); | |
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834 FlexibleWorkGang* workers = gch->workers(); |
| 0 | 835 assert(workers != NULL, "Need parallel worker threads."); |
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836 _state_set.reset(workers->active_workers(), _generation.promotion_failed()); |
| 0 | 837 ParNewRefProcTaskProxy rp_task(task, _generation, *_generation.next_gen(), |
| 838 _generation.reserved().end(), _state_set); | |
| 839 workers->run_task(&rp_task); | |
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840 _state_set.reset(0 /* bad value in debug if not reset */, |
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841 _generation.promotion_failed()); |
| 0 | 842 } |
| 843 | |
| 844 void ParNewRefProcTaskExecutor::execute(EnqueueTask& task) | |
| 845 { | |
| 846 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
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847 FlexibleWorkGang* workers = gch->workers(); |
| 0 | 848 assert(workers != NULL, "Need parallel worker threads."); |
| 849 ParNewRefEnqueueTaskProxy enq_task(task); | |
| 850 workers->run_task(&enq_task); | |
| 851 } | |
| 852 | |
| 853 void ParNewRefProcTaskExecutor::set_single_threaded_mode() | |
| 854 { | |
| 855 _state_set.flush(); | |
| 856 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 857 gch->set_par_threads(0); // 0 ==> non-parallel. | |
| 858 gch->save_marks(); | |
| 859 } | |
| 860 | |
| 861 ScanClosureWithParBarrier:: | |
| 862 ScanClosureWithParBarrier(ParNewGeneration* g, bool gc_barrier) : | |
| 863 ScanClosure(g, gc_barrier) {} | |
| 864 | |
| 865 EvacuateFollowersClosureGeneral:: | |
| 866 EvacuateFollowersClosureGeneral(GenCollectedHeap* gch, int level, | |
| 867 OopsInGenClosure* cur, | |
| 868 OopsInGenClosure* older) : | |
| 869 _gch(gch), _level(level), | |
| 870 _scan_cur_or_nonheap(cur), _scan_older(older) | |
| 871 {} | |
| 872 | |
| 873 void EvacuateFollowersClosureGeneral::do_void() { | |
| 874 do { | |
| 875 // Beware: this call will lead to closure applications via virtual | |
| 876 // calls. | |
| 877 _gch->oop_since_save_marks_iterate(_level, | |
| 878 _scan_cur_or_nonheap, | |
| 879 _scan_older); | |
| 880 } while (!_gch->no_allocs_since_save_marks(_level)); | |
| 881 } | |
| 882 | |
| 883 | |
| 10405 | 884 // A Generation that does parallel young-gen collection. |
| 885 | |
| 0 | 886 bool ParNewGeneration::_avoid_promotion_undo = false; |
| 887 | |
| 10405 | 888 void ParNewGeneration::handle_promotion_failed(GenCollectedHeap* gch, ParScanThreadStateSet& thread_state_set, ParNewTracer& gc_tracer) { |
| 889 assert(_promo_failure_scan_stack.is_empty(), "post condition"); | |
| 890 _promo_failure_scan_stack.clear(true); // Clear cached segments. | |
| 891 | |
| 892 remove_forwarding_pointers(); | |
| 893 if (PrintGCDetails) { | |
| 894 gclog_or_tty->print(" (promotion failed)"); | |
| 895 } | |
| 896 // All the spaces are in play for mark-sweep. | |
| 897 swap_spaces(); // Make life simpler for CMS || rescan; see 6483690. | |
| 898 from()->set_next_compaction_space(to()); | |
| 899 gch->set_incremental_collection_failed(); | |
| 900 // Inform the next generation that a promotion failure occurred. | |
| 901 _next_gen->promotion_failure_occurred(); | |
| 902 | |
| 903 // Trace promotion failure in the parallel GC threads | |
| 904 thread_state_set.trace_promotion_failed(gc_tracer); | |
| 905 // Single threaded code may have reported promotion failure to the global state | |
| 906 if (_promotion_failed_info.has_failed()) { | |
| 907 gc_tracer.report_promotion_failed(_promotion_failed_info); | |
| 908 } | |
| 909 // Reset the PromotionFailureALot counters. | |
| 910 NOT_PRODUCT(Universe::heap()->reset_promotion_should_fail();) | |
| 911 } | |
| 0 | 912 |
| 913 void ParNewGeneration::collect(bool full, | |
| 914 bool clear_all_soft_refs, | |
| 915 size_t size, | |
| 916 bool is_tlab) { | |
| 917 assert(full || size > 0, "otherwise we don't want to collect"); | |
| 10405 | 918 |
| 0 | 919 GenCollectedHeap* gch = GenCollectedHeap::heap(); |
| 10405 | 920 |
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921 _gc_timer->register_gc_start(); |
| 10405 | 922 |
| 0 | 923 assert(gch->kind() == CollectedHeap::GenCollectedHeap, |
| 924 "not a CMS generational heap"); | |
| 925 AdaptiveSizePolicy* size_policy = gch->gen_policy()->size_policy(); | |
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926 FlexibleWorkGang* workers = gch->workers(); |
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927 assert(workers != NULL, "Need workgang for parallel work"); |
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928 int active_workers = |
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929 AdaptiveSizePolicy::calc_active_workers(workers->total_workers(), |
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930 workers->active_workers(), |
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931 Threads::number_of_non_daemon_threads()); |
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932 workers->set_active_workers(active_workers); |
| 0 | 933 assert(gch->n_gens() == 2, |
| 934 "Par collection currently only works with single older gen."); | |
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935 _next_gen = gch->next_gen(this); |
| 0 | 936 // Do we have to avoid promotion_undo? |
| 937 if (gch->collector_policy()->is_concurrent_mark_sweep_policy()) { | |
| 938 set_avoid_promotion_undo(true); | |
| 939 } | |
| 940 | |
| 10405 | 941 // If the next generation is too full to accommodate worst-case promotion |
| 0 | 942 // from this generation, pass on collection; let the next generation |
| 943 // do it. | |
| 944 if (!collection_attempt_is_safe()) { | |
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945 gch->set_incremental_collection_failed(); // slight lie, in that we did not even attempt one |
| 0 | 946 return; |
| 947 } | |
| 948 assert(to()->is_empty(), "Else not collection_attempt_is_safe"); | |
| 949 | |
| 10405 | 950 ParNewTracer gc_tracer; |
| 951 gc_tracer.report_gc_start(gch->gc_cause(), _gc_timer->gc_start()); | |
| 952 gch->trace_heap_before_gc(&gc_tracer); | |
| 953 | |
| 0 | 954 init_assuming_no_promotion_failure(); |
| 955 | |
| 956 if (UseAdaptiveSizePolicy) { | |
| 957 set_survivor_overflow(false); | |
| 958 size_policy->minor_collection_begin(); | |
| 959 } | |
| 960 | |
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961 GCTraceTime t1(GCCauseString("GC", gch->gc_cause()), PrintGC && !PrintGCDetails, true, NULL, gc_tracer.gc_id()); |
| 0 | 962 // Capture heap used before collection (for printing). |
| 963 size_t gch_prev_used = gch->used(); | |
| 964 | |
| 965 SpecializationStats::clear(); | |
| 966 | |
| 967 age_table()->clear(); | |
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968 to()->clear(SpaceDecorator::Mangle); |
| 0 | 969 |
| 970 gch->save_marks(); | |
| 971 assert(workers != NULL, "Need parallel worker threads."); | |
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972 int n_workers = active_workers; |
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973 |
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974 // Set the correct parallelism (number of queues) in the reference processor |
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975 ref_processor()->set_active_mt_degree(n_workers); |
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976 |
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977 // Always set the terminator for the active number of workers |
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978 // because only those workers go through the termination protocol. |
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979 ParallelTaskTerminator _term(n_workers, task_queues()); |
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980 ParScanThreadStateSet thread_state_set(workers->active_workers(), |
| 0 | 981 *to(), *this, *_next_gen, *task_queues(), |
| 695 | 982 _overflow_stacks, desired_plab_sz(), _term); |
| 0 | 983 |
| 984 ParNewGenTask tsk(this, _next_gen, reserved().end(), &thread_state_set); | |
| 985 gch->set_par_threads(n_workers); | |
| 986 gch->rem_set()->prepare_for_younger_refs_iterate(true); | |
| 987 // It turns out that even when we're using 1 thread, doing the work in a | |
| 988 // separate thread causes wide variance in run times. We can't help this | |
| 989 // in the multi-threaded case, but we special-case n=1 here to get | |
| 990 // repeatable measurements of the 1-thread overhead of the parallel code. | |
| 991 if (n_workers > 1) { | |
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992 GenCollectedHeap::StrongRootsScope srs(gch); |
| 0 | 993 workers->run_task(&tsk); |
| 994 } else { | |
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995 GenCollectedHeap::StrongRootsScope srs(gch); |
| 0 | 996 tsk.work(0); |
| 997 } | |
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998 thread_state_set.reset(0 /* Bad value in debug if not reset */, |
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999 promotion_failed()); |
| 0 | 1000 |
| 1001 // Process (weak) reference objects found during scavenge. | |
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1002 ReferenceProcessor* rp = ref_processor(); |
| 0 | 1003 IsAliveClosure is_alive(this); |
| 1004 ScanWeakRefClosure scan_weak_ref(this); | |
| 1005 KeepAliveClosure keep_alive(&scan_weak_ref); | |
| 1006 ScanClosure scan_without_gc_barrier(this, false); | |
| 1007 ScanClosureWithParBarrier scan_with_gc_barrier(this, true); | |
| 1008 set_promo_failure_scan_stack_closure(&scan_without_gc_barrier); | |
| 1009 EvacuateFollowersClosureGeneral evacuate_followers(gch, _level, | |
| 1010 &scan_without_gc_barrier, &scan_with_gc_barrier); | |
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1011 rp->setup_policy(clear_all_soft_refs); |
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1012 // Can the mt_degree be set later (at run_task() time would be best)? |
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1013 rp->set_active_mt_degree(active_workers); |
| 10405 | 1014 ReferenceProcessorStats stats; |
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1015 if (rp->processing_is_mt()) { |
| 0 | 1016 ParNewRefProcTaskExecutor task_executor(*this, thread_state_set); |
| 10405 | 1017 stats = rp->process_discovered_references(&is_alive, &keep_alive, |
| 1018 &evacuate_followers, &task_executor, | |
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1019 _gc_timer, gc_tracer.gc_id()); |
| 0 | 1020 } else { |
| 1021 thread_state_set.flush(); | |
| 1022 gch->set_par_threads(0); // 0 ==> non-parallel. | |
| 1023 gch->save_marks(); | |
| 10405 | 1024 stats = rp->process_discovered_references(&is_alive, &keep_alive, |
| 1025 &evacuate_followers, NULL, | |
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1026 _gc_timer, gc_tracer.gc_id()); |
| 0 | 1027 } |
| 10405 | 1028 gc_tracer.report_gc_reference_stats(stats); |
| 0 | 1029 if (!promotion_failed()) { |
| 1030 // Swap the survivor spaces. | |
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1031 eden()->clear(SpaceDecorator::Mangle); |
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1032 from()->clear(SpaceDecorator::Mangle); |
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1033 if (ZapUnusedHeapArea) { |
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1034 // This is now done here because of the piece-meal mangling which |
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1035 // can check for valid mangling at intermediate points in the |
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1036 // collection(s). When a minor collection fails to collect |
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1037 // sufficient space resizing of the young generation can occur |
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1038 // an redistribute the spaces in the young generation. Mangle |
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1039 // here so that unzapped regions don't get distributed to |
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1040 // other spaces. |
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1041 to()->mangle_unused_area(); |
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1042 } |
| 0 | 1043 swap_spaces(); |
| 1044 | |
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1045 // A successful scavenge should restart the GC time limit count which is |
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1046 // for full GC's. |
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1047 size_policy->reset_gc_overhead_limit_count(); |
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1048 |
| 0 | 1049 assert(to()->is_empty(), "to space should be empty now"); |
|
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1050 |
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1051 adjust_desired_tenuring_threshold(); |
| 0 | 1052 } else { |
| 10405 | 1053 handle_promotion_failed(gch, thread_state_set, gc_tracer); |
| 0 | 1054 } |
| 1055 // set new iteration safe limit for the survivor spaces | |
| 1056 from()->set_concurrent_iteration_safe_limit(from()->top()); | |
| 1057 to()->set_concurrent_iteration_safe_limit(to()->top()); | |
| 1058 | |
| 1059 if (ResizePLAB) { | |
| 6819 | 1060 plab_stats()->adjust_desired_plab_sz(n_workers); |
| 0 | 1061 } |
| 1062 | |
| 1063 if (PrintGC && !PrintGCDetails) { | |
| 1064 gch->print_heap_change(gch_prev_used); | |
| 1065 } | |
| 1066 | |
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1067 if (PrintGCDetails && ParallelGCVerbose) { |
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1068 TASKQUEUE_STATS_ONLY(thread_state_set.print_termination_stats()); |
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1069 TASKQUEUE_STATS_ONLY(thread_state_set.print_taskqueue_stats()); |
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1070 } |
| 1710 | 1071 |
| 0 | 1072 if (UseAdaptiveSizePolicy) { |
| 1073 size_policy->minor_collection_end(gch->gc_cause()); | |
| 1074 size_policy->avg_survived()->sample(from()->used()); | |
| 1075 } | |
| 1076 | |
| 4911 | 1077 // We need to use a monotonically non-deccreasing time in ms |
| 1078 // or we will see time-warp warnings and os::javaTimeMillis() | |
| 1079 // does not guarantee monotonicity. | |
| 1080 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; | |
| 1081 update_time_of_last_gc(now); | |
| 0 | 1082 |
| 1083 SpecializationStats::print(); | |
| 1084 | |
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1085 rp->set_enqueuing_is_done(true); |
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1086 if (rp->processing_is_mt()) { |
| 0 | 1087 ParNewRefProcTaskExecutor task_executor(*this, thread_state_set); |
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1088 rp->enqueue_discovered_references(&task_executor); |
| 0 | 1089 } else { |
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1090 rp->enqueue_discovered_references(NULL); |
| 0 | 1091 } |
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1092 rp->verify_no_references_recorded(); |
| 10405 | 1093 |
| 1094 gch->trace_heap_after_gc(&gc_tracer); | |
| 1095 gc_tracer.report_tenuring_threshold(tenuring_threshold()); | |
| 1096 | |
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1097 _gc_timer->register_gc_end(); |
| 10405 | 1098 |
| 1099 gc_tracer.report_gc_end(_gc_timer->gc_end(), _gc_timer->time_partitions()); | |
| 0 | 1100 } |
| 1101 | |
| 1102 static int sum; | |
| 1103 void ParNewGeneration::waste_some_time() { | |
| 1104 for (int i = 0; i < 100; i++) { | |
| 1105 sum += i; | |
| 1106 } | |
| 1107 } | |
| 1108 | |
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1109 static const oop ClaimedForwardPtr = cast_to_oop<intptr_t>(0x4); |
| 0 | 1110 |
| 1111 // Because of concurrency, there are times where an object for which | |
| 1112 // "is_forwarded()" is true contains an "interim" forwarding pointer | |
| 1113 // value. Such a value will soon be overwritten with a real value. | |
| 1114 // This method requires "obj" to have a forwarding pointer, and waits, if | |
| 1115 // necessary for a real one to be inserted, and returns it. | |
| 1116 | |
| 1117 oop ParNewGeneration::real_forwardee(oop obj) { | |
| 1118 oop forward_ptr = obj->forwardee(); | |
| 1119 if (forward_ptr != ClaimedForwardPtr) { | |
| 1120 return forward_ptr; | |
| 1121 } else { | |
| 1122 return real_forwardee_slow(obj); | |
| 1123 } | |
| 1124 } | |
| 1125 | |
| 1126 oop ParNewGeneration::real_forwardee_slow(oop obj) { | |
| 1127 // Spin-read if it is claimed but not yet written by another thread. | |
| 1128 oop forward_ptr = obj->forwardee(); | |
| 1129 while (forward_ptr == ClaimedForwardPtr) { | |
| 1130 waste_some_time(); | |
| 1131 assert(obj->is_forwarded(), "precondition"); | |
| 1132 forward_ptr = obj->forwardee(); | |
| 1133 } | |
| 1134 return forward_ptr; | |
| 1135 } | |
| 1136 | |
| 1137 #ifdef ASSERT | |
| 1138 bool ParNewGeneration::is_legal_forward_ptr(oop p) { | |
| 1139 return | |
| 1140 (_avoid_promotion_undo && p == ClaimedForwardPtr) | |
| 1141 || Universe::heap()->is_in_reserved(p); | |
| 1142 } | |
| 1143 #endif | |
| 1144 | |
| 1145 void ParNewGeneration::preserve_mark_if_necessary(oop obj, markOop m) { | |
|
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1146 if (m->must_be_preserved_for_promotion_failure(obj)) { |
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1147 // We should really have separate per-worker stacks, rather |
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1148 // than use locking of a common pair of stacks. |
| 0 | 1149 MutexLocker ml(ParGCRareEvent_lock); |
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1150 preserve_mark(obj, m); |
| 0 | 1151 } |
| 1152 } | |
| 1153 | |
| 1154 // Multiple GC threads may try to promote an object. If the object | |
| 1155 // is successfully promoted, a forwarding pointer will be installed in | |
| 1156 // the object in the young generation. This method claims the right | |
| 1157 // to install the forwarding pointer before it copies the object, | |
| 1158 // thus avoiding the need to undo the copy as in | |
| 1159 // copy_to_survivor_space_avoiding_with_undo. | |
| 1160 | |
| 1161 oop ParNewGeneration::copy_to_survivor_space_avoiding_promotion_undo( | |
| 1162 ParScanThreadState* par_scan_state, oop old, size_t sz, markOop m) { | |
| 1163 // In the sequential version, this assert also says that the object is | |
| 1164 // not forwarded. That might not be the case here. It is the case that | |
| 1165 // the caller observed it to be not forwarded at some time in the past. | |
| 1166 assert(is_in_reserved(old), "shouldn't be scavenging this oop"); | |
| 1167 | |
| 1168 // The sequential code read "old->age()" below. That doesn't work here, | |
| 1169 // since the age is in the mark word, and that might be overwritten with | |
| 1170 // a forwarding pointer by a parallel thread. So we must save the mark | |
| 1171 // word in a local and then analyze it. | |
| 1172 oopDesc dummyOld; | |
| 1173 dummyOld.set_mark(m); | |
| 1174 assert(!dummyOld.is_forwarded(), | |
| 1175 "should not be called with forwarding pointer mark word."); | |
| 1176 | |
| 1177 oop new_obj = NULL; | |
| 1178 oop forward_ptr; | |
| 1179 | |
| 1180 // Try allocating obj in to-space (unless too old) | |
| 1181 if (dummyOld.age() < tenuring_threshold()) { | |
| 1182 new_obj = (oop)par_scan_state->alloc_in_to_space(sz); | |
| 1183 if (new_obj == NULL) { | |
| 1184 set_survivor_overflow(true); | |
| 1185 } | |
| 1186 } | |
| 1187 | |
| 1188 if (new_obj == NULL) { | |
| 1189 // Either to-space is full or we decided to promote | |
| 1190 // try allocating obj tenured | |
| 1191 | |
| 1192 // Attempt to install a null forwarding pointer (atomically), | |
| 1193 // to claim the right to install the real forwarding pointer. | |
| 1194 forward_ptr = old->forward_to_atomic(ClaimedForwardPtr); | |
| 1195 if (forward_ptr != NULL) { | |
| 1196 // someone else beat us to it. | |
| 1197 return real_forwardee(old); | |
| 1198 } | |
| 1199 | |
| 1200 new_obj = _next_gen->par_promote(par_scan_state->thread_num(), | |
| 1201 old, m, sz); | |
| 1202 | |
| 1203 if (new_obj == NULL) { | |
| 1204 // promotion failed, forward to self | |
| 1205 _promotion_failed = true; | |
| 1206 new_obj = old; | |
| 1207 | |
| 1208 preserve_mark_if_necessary(old, m); | |
| 10405 | 1209 par_scan_state->register_promotion_failure(sz); |
| 0 | 1210 } |
| 1211 | |
| 1212 old->forward_to(new_obj); | |
| 1213 forward_ptr = NULL; | |
| 1214 } else { | |
| 1215 // Is in to-space; do copying ourselves. | |
| 1216 Copy::aligned_disjoint_words((HeapWord*)old, (HeapWord*)new_obj, sz); | |
| 1217 forward_ptr = old->forward_to_atomic(new_obj); | |
| 1218 // Restore the mark word copied above. | |
| 1219 new_obj->set_mark(m); | |
| 1220 // Increment age if obj still in new generation | |
| 1221 new_obj->incr_age(); | |
| 1222 par_scan_state->age_table()->add(new_obj, sz); | |
| 1223 } | |
| 1224 assert(new_obj != NULL, "just checking"); | |
| 1225 | |
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1226 #ifndef PRODUCT |
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1227 // This code must come after the CAS test, or it will print incorrect |
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1228 // information. |
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1229 if (TraceScavenge) { |
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1230 gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (%d)}", |
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1231 is_in_reserved(new_obj) ? "copying" : "tenuring", |
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1232 new_obj->klass()->internal_name(), (void *)old, (void *)new_obj, new_obj->size()); |
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1233 } |
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1234 #endif |
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1235 |
| 0 | 1236 if (forward_ptr == NULL) { |
| 1237 oop obj_to_push = new_obj; | |
| 1238 if (par_scan_state->should_be_partially_scanned(obj_to_push, old)) { | |
| 1239 // Length field used as index of next element to be scanned. | |
| 1240 // Real length can be obtained from real_forwardee() | |
| 1241 arrayOop(old)->set_length(0); | |
| 1242 obj_to_push = old; | |
| 1243 assert(obj_to_push->is_forwarded() && obj_to_push->forwardee() != obj_to_push, | |
| 1244 "push forwarded object"); | |
| 1245 } | |
| 1246 // Push it on one of the queues of to-be-scanned objects. | |
| 534 | 1247 bool simulate_overflow = false; |
| 1248 NOT_PRODUCT( | |
| 1249 if (ParGCWorkQueueOverflowALot && should_simulate_overflow()) { | |
| 1250 // simulate a stack overflow | |
| 1251 simulate_overflow = true; | |
| 1252 } | |
| 1253 ) | |
| 1254 if (simulate_overflow || !par_scan_state->work_queue()->push(obj_to_push)) { | |
| 0 | 1255 // Add stats for overflow pushes. |
| 1256 if (Verbose && PrintGCDetails) { | |
| 1257 gclog_or_tty->print("queue overflow!\n"); | |
| 1258 } | |
| 534 | 1259 push_on_overflow_list(old, par_scan_state); |
| 1710 | 1260 TASKQUEUE_STATS_ONLY(par_scan_state->taskqueue_stats().record_overflow(0)); |
| 0 | 1261 } |
| 1262 | |
| 1263 return new_obj; | |
| 1264 } | |
| 1265 | |
| 1266 // Oops. Someone beat us to it. Undo the allocation. Where did we | |
| 1267 // allocate it? | |
| 1268 if (is_in_reserved(new_obj)) { | |
| 1269 // Must be in to_space. | |
| 1270 assert(to()->is_in_reserved(new_obj), "Checking"); | |
| 1271 if (forward_ptr == ClaimedForwardPtr) { | |
| 1272 // Wait to get the real forwarding pointer value. | |
| 1273 forward_ptr = real_forwardee(old); | |
| 1274 } | |
| 1275 par_scan_state->undo_alloc_in_to_space((HeapWord*)new_obj, sz); | |
| 1276 } | |
| 1277 | |
| 1278 return forward_ptr; | |
| 1279 } | |
| 1280 | |
| 1281 | |
| 1282 // Multiple GC threads may try to promote the same object. If two | |
| 1283 // or more GC threads copy the object, only one wins the race to install | |
| 1284 // the forwarding pointer. The other threads have to undo their copy. | |
| 1285 | |
| 1286 oop ParNewGeneration::copy_to_survivor_space_with_undo( | |
| 1287 ParScanThreadState* par_scan_state, oop old, size_t sz, markOop m) { | |
| 1288 | |
| 1289 // In the sequential version, this assert also says that the object is | |
| 1290 // not forwarded. That might not be the case here. It is the case that | |
| 1291 // the caller observed it to be not forwarded at some time in the past. | |
| 1292 assert(is_in_reserved(old), "shouldn't be scavenging this oop"); | |
| 1293 | |
| 1294 // The sequential code read "old->age()" below. That doesn't work here, | |
| 1295 // since the age is in the mark word, and that might be overwritten with | |
| 1296 // a forwarding pointer by a parallel thread. So we must save the mark | |
| 1297 // word here, install it in a local oopDesc, and then analyze it. | |
| 1298 oopDesc dummyOld; | |
| 1299 dummyOld.set_mark(m); | |
| 1300 assert(!dummyOld.is_forwarded(), | |
| 1301 "should not be called with forwarding pointer mark word."); | |
| 1302 | |
| 1303 bool failed_to_promote = false; | |
| 1304 oop new_obj = NULL; | |
| 1305 oop forward_ptr; | |
| 1306 | |
| 1307 // Try allocating obj in to-space (unless too old) | |
| 1308 if (dummyOld.age() < tenuring_threshold()) { | |
| 1309 new_obj = (oop)par_scan_state->alloc_in_to_space(sz); | |
| 1310 if (new_obj == NULL) { | |
| 1311 set_survivor_overflow(true); | |
| 1312 } | |
| 1313 } | |
| 1314 | |
| 1315 if (new_obj == NULL) { | |
| 1316 // Either to-space is full or we decided to promote | |
| 1317 // try allocating obj tenured | |
| 1318 new_obj = _next_gen->par_promote(par_scan_state->thread_num(), | |
| 1319 old, m, sz); | |
| 1320 | |
| 1321 if (new_obj == NULL) { | |
| 1322 // promotion failed, forward to self | |
| 1323 forward_ptr = old->forward_to_atomic(old); | |
| 1324 new_obj = old; | |
| 1325 | |
| 1326 if (forward_ptr != NULL) { | |
| 1327 return forward_ptr; // someone else succeeded | |
| 1328 } | |
| 1329 | |
| 1330 _promotion_failed = true; | |
| 1331 failed_to_promote = true; | |
| 1332 | |
| 1333 preserve_mark_if_necessary(old, m); | |
| 10405 | 1334 par_scan_state->register_promotion_failure(sz); |
| 0 | 1335 } |
| 1336 } else { | |
| 1337 // Is in to-space; do copying ourselves. | |
| 1338 Copy::aligned_disjoint_words((HeapWord*)old, (HeapWord*)new_obj, sz); | |
| 1339 // Restore the mark word copied above. | |
| 1340 new_obj->set_mark(m); | |
| 1341 // Increment age if new_obj still in new generation | |
| 1342 new_obj->incr_age(); | |
| 1343 par_scan_state->age_table()->add(new_obj, sz); | |
| 1344 } | |
| 1345 assert(new_obj != NULL, "just checking"); | |
| 1346 | |
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1347 #ifndef PRODUCT |
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1348 // This code must come after the CAS test, or it will print incorrect |
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1349 // information. |
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1350 if (TraceScavenge) { |
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1351 gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (%d)}", |
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1352 is_in_reserved(new_obj) ? "copying" : "tenuring", |
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1353 new_obj->klass()->internal_name(), (void *)old, (void *)new_obj, new_obj->size()); |
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1354 } |
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1355 #endif |
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1356 |
| 0 | 1357 // Now attempt to install the forwarding pointer (atomically). |
| 1358 // We have to copy the mark word before overwriting with forwarding | |
| 1359 // ptr, so we can restore it below in the copy. | |
| 1360 if (!failed_to_promote) { | |
| 1361 forward_ptr = old->forward_to_atomic(new_obj); | |
| 1362 } | |
| 1363 | |
| 1364 if (forward_ptr == NULL) { | |
| 1365 oop obj_to_push = new_obj; | |
| 1366 if (par_scan_state->should_be_partially_scanned(obj_to_push, old)) { | |
| 1367 // Length field used as index of next element to be scanned. | |
| 1368 // Real length can be obtained from real_forwardee() | |
| 1369 arrayOop(old)->set_length(0); | |
| 1370 obj_to_push = old; | |
| 1371 assert(obj_to_push->is_forwarded() && obj_to_push->forwardee() != obj_to_push, | |
| 1372 "push forwarded object"); | |
| 1373 } | |
| 1374 // Push it on one of the queues of to-be-scanned objects. | |
| 534 | 1375 bool simulate_overflow = false; |
| 1376 NOT_PRODUCT( | |
| 1377 if (ParGCWorkQueueOverflowALot && should_simulate_overflow()) { | |
| 1378 // simulate a stack overflow | |
| 1379 simulate_overflow = true; | |
| 1380 } | |
| 1381 ) | |
| 1382 if (simulate_overflow || !par_scan_state->work_queue()->push(obj_to_push)) { | |
| 0 | 1383 // Add stats for overflow pushes. |
| 534 | 1384 push_on_overflow_list(old, par_scan_state); |
| 1710 | 1385 TASKQUEUE_STATS_ONLY(par_scan_state->taskqueue_stats().record_overflow(0)); |
| 0 | 1386 } |
| 1387 | |
| 1388 return new_obj; | |
| 1389 } | |
| 1390 | |
| 1391 // Oops. Someone beat us to it. Undo the allocation. Where did we | |
| 1392 // allocate it? | |
| 1393 if (is_in_reserved(new_obj)) { | |
| 1394 // Must be in to_space. | |
| 1395 assert(to()->is_in_reserved(new_obj), "Checking"); | |
| 1396 par_scan_state->undo_alloc_in_to_space((HeapWord*)new_obj, sz); | |
| 1397 } else { | |
| 1398 assert(!_avoid_promotion_undo, "Should not be here if avoiding."); | |
| 1399 _next_gen->par_promote_alloc_undo(par_scan_state->thread_num(), | |
| 1400 (HeapWord*)new_obj, sz); | |
| 1401 } | |
| 1402 | |
| 1403 return forward_ptr; | |
| 1404 } | |
| 1405 | |
| 534 | 1406 #ifndef PRODUCT |
| 1407 // It's OK to call this multi-threaded; the worst thing | |
| 1408 // that can happen is that we'll get a bunch of closely | |
| 1409 // spaced simulated oveflows, but that's OK, in fact | |
| 1410 // probably good as it would exercise the overflow code | |
| 1411 // under contention. | |
| 1412 bool ParNewGeneration::should_simulate_overflow() { | |
| 1413 if (_overflow_counter-- <= 0) { // just being defensive | |
| 1414 _overflow_counter = ParGCWorkQueueOverflowInterval; | |
| 1415 return true; | |
| 1416 } else { | |
| 1417 return false; | |
| 1418 } | |
| 1419 } | |
| 1420 #endif | |
| 1421 | |
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1422 // In case we are using compressed oops, we need to be careful. |
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1423 // If the object being pushed is an object array, then its length |
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1424 // field keeps track of the "grey boundary" at which the next |
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1425 // incremental scan will be done (see ParGCArrayScanChunk). |
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1426 // When using compressed oops, this length field is kept in the |
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1427 // lower 32 bits of the erstwhile klass word and cannot be used |
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1428 // for the overflow chaining pointer (OCP below). As such the OCP |
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1429 // would itself need to be compressed into the top 32-bits in this |
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1430 // case. Unfortunately, see below, in the event that we have a |
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1431 // promotion failure, the node to be pushed on the list can be |
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1432 // outside of the Java heap, so the heap-based pointer compression |
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1433 // would not work (we would have potential aliasing between C-heap |
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1434 // and Java-heap pointers). For this reason, when using compressed |
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1435 // oops, we simply use a worker-thread-local, non-shared overflow |
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1436 // list in the form of a growable array, with a slightly different |
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1437 // overflow stack draining strategy. If/when we start using fat |
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1438 // stacks here, we can go back to using (fat) pointer chains |
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1439 // (although some performance comparisons would be useful since |
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1440 // single global lists have their own performance disadvantages |
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1441 // as we were made painfully aware not long ago, see 6786503). |
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1442 #define BUSY (cast_to_oop<intptr_t>(0x1aff1aff)) |
| 534 | 1443 void ParNewGeneration::push_on_overflow_list(oop from_space_obj, ParScanThreadState* par_scan_state) { |
|
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1444 assert(is_in_reserved(from_space_obj), "Should be from this generation"); |
| 695 | 1445 if (ParGCUseLocalOverflow) { |
|
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1446 // In the case of compressed oops, we use a private, not-shared |
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1447 // overflow stack. |
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1448 par_scan_state->push_on_overflow_stack(from_space_obj); |
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1449 } else { |
| 695 | 1450 assert(!UseCompressedOops, "Error"); |
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1451 // if the object has been forwarded to itself, then we cannot |
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1452 // use the klass pointer for the linked list. Instead we have |
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1453 // to allocate an oopDesc in the C-Heap and use that for the linked list. |
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1454 // XXX This is horribly inefficient when a promotion failure occurs |
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1455 // and should be fixed. XXX FIX ME !!! |
| 534 | 1456 #ifndef PRODUCT |
|
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1457 Atomic::inc_ptr(&_num_par_pushes); |
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1458 assert(_num_par_pushes > 0, "Tautology"); |
| 534 | 1459 #endif |
|
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1460 if (from_space_obj->forwardee() == from_space_obj) { |
| 6197 | 1461 oopDesc* listhead = NEW_C_HEAP_ARRAY(oopDesc, 1, mtGC); |
|
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1462 listhead->forward_to(from_space_obj); |
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1463 from_space_obj = listhead; |
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1464 } |
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1465 oop observed_overflow_list = _overflow_list; |
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1466 oop cur_overflow_list; |
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1467 do { |
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1468 cur_overflow_list = observed_overflow_list; |
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1469 if (cur_overflow_list != BUSY) { |
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1470 from_space_obj->set_klass_to_list_ptr(cur_overflow_list); |
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1471 } else { |
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1472 from_space_obj->set_klass_to_list_ptr(NULL); |
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1473 } |
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1474 observed_overflow_list = |
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1475 (oop)Atomic::cmpxchg_ptr(from_space_obj, &_overflow_list, cur_overflow_list); |
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1476 } while (cur_overflow_list != observed_overflow_list); |
| 0 | 1477 } |
| 1478 } | |
| 1479 | |
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1480 bool ParNewGeneration::take_from_overflow_list(ParScanThreadState* par_scan_state) { |
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1481 bool res; |
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1482 |
| 695 | 1483 if (ParGCUseLocalOverflow) { |
|
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1484 res = par_scan_state->take_from_overflow_stack(); |
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1485 } else { |
| 695 | 1486 assert(!UseCompressedOops, "Error"); |
|
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1487 res = take_from_overflow_list_work(par_scan_state); |
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1488 } |
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1489 return res; |
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1490 } |
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1491 |
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1492 |
| 534 | 1493 // *NOTE*: The overflow list manipulation code here and |
| 1494 // in CMSCollector:: are very similar in shape, | |
| 1495 // except that in the CMS case we thread the objects | |
| 1496 // directly into the list via their mark word, and do | |
| 1497 // not need to deal with special cases below related | |
| 1498 // to chunking of object arrays and promotion failure | |
| 1499 // handling. | |
| 1500 // CR 6797058 has been filed to attempt consolidation of | |
| 1501 // the common code. | |
| 1502 // Because of the common code, if you make any changes in | |
| 1503 // the code below, please check the CMS version to see if | |
| 1504 // similar changes might be needed. | |
| 1505 // See CMSCollector::par_take_from_overflow_list() for | |
| 1506 // more extensive documentation comments. | |
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1507 bool ParNewGeneration::take_from_overflow_list_work(ParScanThreadState* par_scan_state) { |
| 0 | 1508 ObjToScanQueue* work_q = par_scan_state->work_queue(); |
| 1509 // How many to take? | |
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1510 size_t objsFromOverflow = MIN2((size_t)(work_q->max_elems() - work_q->size())/4, |
| 534 | 1511 (size_t)ParGCDesiredObjsFromOverflowList); |
| 0 | 1512 |
|
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1513 assert(!UseCompressedOops, "Error"); |
|
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1514 assert(par_scan_state->overflow_stack() == NULL, "Error"); |
| 0 | 1515 if (_overflow_list == NULL) return false; |
| 1516 | |
| 1517 // Otherwise, there was something there; try claiming the list. | |
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1518 oop prefix = cast_to_oop(Atomic::xchg_ptr(BUSY, &_overflow_list)); |
| 534 | 1519 // Trim off a prefix of at most objsFromOverflow items |
| 1520 Thread* tid = Thread::current(); | |
| 1521 size_t spin_count = (size_t)ParallelGCThreads; | |
| 1522 size_t sleep_time_millis = MAX2((size_t)1, objsFromOverflow/100); | |
| 1523 for (size_t spin = 0; prefix == BUSY && spin < spin_count; spin++) { | |
| 1524 // someone grabbed it before we did ... | |
| 1525 // ... we spin for a short while... | |
| 1526 os::sleep(tid, sleep_time_millis, false); | |
| 1527 if (_overflow_list == NULL) { | |
| 1528 // nothing left to take | |
| 1529 return false; | |
| 1530 } else if (_overflow_list != BUSY) { | |
| 1531 // try and grab the prefix | |
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1532 prefix = cast_to_oop(Atomic::xchg_ptr(BUSY, &_overflow_list)); |
| 534 | 1533 } |
| 0 | 1534 } |
| 534 | 1535 if (prefix == NULL || prefix == BUSY) { |
| 1536 // Nothing to take or waited long enough | |
| 1537 if (prefix == NULL) { | |
| 1538 // Write back the NULL in case we overwrote it with BUSY above | |
| 1539 // and it is still the same value. | |
| 1540 (void) Atomic::cmpxchg_ptr(NULL, &_overflow_list, BUSY); | |
| 1541 } | |
| 1542 return false; | |
| 1543 } | |
| 1544 assert(prefix != NULL && prefix != BUSY, "Error"); | |
| 1545 size_t i = 1; | |
| 0 | 1546 oop cur = prefix; |
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1547 while (i < objsFromOverflow && cur->klass_or_null() != NULL) { |
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1548 i++; cur = cur->list_ptr_from_klass(); |
| 0 | 1549 } |
| 1550 | |
| 1551 // Reattach remaining (suffix) to overflow list | |
| 534 | 1552 if (cur->klass_or_null() == NULL) { |
| 1553 // Write back the NULL in lieu of the BUSY we wrote | |
| 1554 // above and it is still the same value. | |
| 1555 if (_overflow_list == BUSY) { | |
| 1556 (void) Atomic::cmpxchg_ptr(NULL, &_overflow_list, BUSY); | |
| 0 | 1557 } |
| 534 | 1558 } else { |
|
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1559 assert(cur->klass_or_null() != (Klass*)(address)BUSY, "Error"); |
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1560 oop suffix = cur->list_ptr_from_klass(); // suffix will be put back on global list |
| 534 | 1561 cur->set_klass_to_list_ptr(NULL); // break off suffix |
| 1562 // It's possible that the list is still in the empty(busy) state | |
| 1563 // we left it in a short while ago; in that case we may be | |
| 1564 // able to place back the suffix. | |
| 1565 oop observed_overflow_list = _overflow_list; | |
| 1566 oop cur_overflow_list = observed_overflow_list; | |
| 1567 bool attached = false; | |
| 1568 while (observed_overflow_list == BUSY || observed_overflow_list == NULL) { | |
| 1569 observed_overflow_list = | |
| 1570 (oop) Atomic::cmpxchg_ptr(suffix, &_overflow_list, cur_overflow_list); | |
| 1571 if (cur_overflow_list == observed_overflow_list) { | |
| 1572 attached = true; | |
| 1573 break; | |
| 1574 } else cur_overflow_list = observed_overflow_list; | |
| 1575 } | |
| 1576 if (!attached) { | |
| 1577 // Too bad, someone else got in in between; we'll need to do a splice. | |
| 1578 // Find the last item of suffix list | |
| 1579 oop last = suffix; | |
| 1580 while (last->klass_or_null() != NULL) { | |
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1581 last = last->list_ptr_from_klass(); |
| 534 | 1582 } |
| 1583 // Atomically prepend suffix to current overflow list | |
| 1584 observed_overflow_list = _overflow_list; | |
| 1585 do { | |
| 1586 cur_overflow_list = observed_overflow_list; | |
| 1587 if (cur_overflow_list != BUSY) { | |
| 1588 // Do the splice ... | |
| 1589 last->set_klass_to_list_ptr(cur_overflow_list); | |
| 1590 } else { // cur_overflow_list == BUSY | |
| 1591 last->set_klass_to_list_ptr(NULL); | |
| 1592 } | |
| 1593 observed_overflow_list = | |
| 1594 (oop)Atomic::cmpxchg_ptr(suffix, &_overflow_list, cur_overflow_list); | |
| 1595 } while (cur_overflow_list != observed_overflow_list); | |
| 0 | 1596 } |
| 1597 } | |
| 1598 | |
| 1599 // Push objects on prefix list onto this thread's work queue | |
| 534 | 1600 assert(prefix != NULL && prefix != BUSY, "program logic"); |
| 0 | 1601 cur = prefix; |
| 534 | 1602 ssize_t n = 0; |
| 0 | 1603 while (cur != NULL) { |
| 1604 oop obj_to_push = cur->forwardee(); | |
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1605 oop next = cur->list_ptr_from_klass(); |
| 0 | 1606 cur->set_klass(obj_to_push->klass()); |
| 534 | 1607 // This may be an array object that is self-forwarded. In that case, the list pointer |
| 1608 // space, cur, is not in the Java heap, but rather in the C-heap and should be freed. | |
| 1609 if (!is_in_reserved(cur)) { | |
| 1610 // This can become a scaling bottleneck when there is work queue overflow coincident | |
| 1611 // with promotion failure. | |
| 1612 oopDesc* f = cur; | |
| 6197 | 1613 FREE_C_HEAP_ARRAY(oopDesc, f, mtGC); |
| 534 | 1614 } else if (par_scan_state->should_be_partially_scanned(obj_to_push, cur)) { |
| 0 | 1615 assert(arrayOop(cur)->length() == 0, "entire array remaining to be scanned"); |
| 534 | 1616 obj_to_push = cur; |
| 0 | 1617 } |
| 534 | 1618 bool ok = work_q->push(obj_to_push); |
| 1619 assert(ok, "Should have succeeded"); | |
| 0 | 1620 cur = next; |
| 1621 n++; | |
| 1622 } | |
| 1710 | 1623 TASKQUEUE_STATS_ONLY(par_scan_state->note_overflow_refill(n)); |
| 534 | 1624 #ifndef PRODUCT |
| 1625 assert(_num_par_pushes >= n, "Too many pops?"); | |
| 1626 Atomic::add_ptr(-(intptr_t)n, &_num_par_pushes); | |
| 1627 #endif | |
| 0 | 1628 return true; |
| 1629 } | |
| 534 | 1630 #undef BUSY |
| 0 | 1631 |
| 10405 | 1632 void ParNewGeneration::ref_processor_init() { |
| 0 | 1633 if (_ref_processor == NULL) { |
| 1634 // Allocate and initialize a reference processor | |
|
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1635 _ref_processor = |
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1636 new ReferenceProcessor(_reserved, // span |
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1637 ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing |
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1638 (int) ParallelGCThreads, // mt processing degree |
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1639 refs_discovery_is_mt(), // mt discovery |
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1640 (int) ParallelGCThreads, // mt discovery degree |
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1641 refs_discovery_is_atomic(), // atomic_discovery |
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8e20ef014b08
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
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1642 NULL); // is_alive_non_header |
| 0 | 1643 } |
| 1644 } | |
| 1645 | |
| 1646 const char* ParNewGeneration::name() const { | |
| 1647 return "par new generation"; | |
| 1648 } |