1 /* 2 * Copyright (c) 2013, 2017, Oracle and/or its affiliates. All rights reserved. 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 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "gc/g1/g1CollectedHeap.inline.hpp" 27 #include "gc/g1/g1GCPhaseTimes.hpp" 28 #include "gc/g1/g1HotCardCache.hpp" 29 #include "gc/g1/g1StringDedup.hpp" 30 #include "gc/shared/workerDataArray.inline.hpp" 31 #include "memory/resourceArea.hpp" 32 #include "logging/log.hpp" 33 #include "logging/logStream.hpp" 34 #include "runtime/timer.hpp" 35 #include "runtime/os.hpp" 36 #include "utilities/macros.hpp" 37 38 static const char* Indents[5] = {"", " ", " ", " ", " "}; 39 40 G1GCPhaseTimes::G1GCPhaseTimes(STWGCTimer* gc_timer, uint max_gc_threads) : 41 _max_gc_threads(max_gc_threads), 42 _gc_start_counter(0), 43 _gc_pause_time_ms(0.0), 44 _ref_phase_times((GCTimer*)gc_timer, max_gc_threads) 45 { 46 assert(max_gc_threads > 0, "Must have some GC threads"); 47 48 _gc_par_phases[GCWorkerStart] = new WorkerDataArray<double>(max_gc_threads, "GC Worker Start (ms):"); 49 _gc_par_phases[ExtRootScan] = new WorkerDataArray<double>(max_gc_threads, "Ext Root Scanning (ms):"); 50 51 // Root scanning phases 52 _gc_par_phases[ThreadRoots] = new WorkerDataArray<double>(max_gc_threads, "Thread Roots (ms):"); 53 _gc_par_phases[StringTableRoots] = new WorkerDataArray<double>(max_gc_threads, "StringTable Roots (ms):"); 54 _gc_par_phases[UniverseRoots] = new WorkerDataArray<double>(max_gc_threads, "Universe Roots (ms):"); 55 _gc_par_phases[JNIRoots] = new WorkerDataArray<double>(max_gc_threads, "JNI Handles Roots (ms):"); 56 _gc_par_phases[ObjectSynchronizerRoots] = new WorkerDataArray<double>(max_gc_threads, "ObjectSynchronizer Roots (ms):"); 57 _gc_par_phases[FlatProfilerRoots] = new WorkerDataArray<double>(max_gc_threads, "FlatProfiler Roots (ms):"); 58 _gc_par_phases[ManagementRoots] = new WorkerDataArray<double>(max_gc_threads, "Management Roots (ms):"); 59 _gc_par_phases[SystemDictionaryRoots] = new WorkerDataArray<double>(max_gc_threads, "SystemDictionary Roots (ms):"); 60 _gc_par_phases[CLDGRoots] = new WorkerDataArray<double>(max_gc_threads, "CLDG Roots (ms):"); 61 _gc_par_phases[JVMTIRoots] = new WorkerDataArray<double>(max_gc_threads, "JVMTI Roots (ms):"); 62 _gc_par_phases[CMRefRoots] = new WorkerDataArray<double>(max_gc_threads, "CM RefProcessor Roots (ms):"); 63 _gc_par_phases[WaitForStrongCLD] = new WorkerDataArray<double>(max_gc_threads, "Wait For Strong CLD (ms):"); 64 _gc_par_phases[WeakCLDRoots] = new WorkerDataArray<double>(max_gc_threads, "Weak CLD Roots (ms):"); 65 _gc_par_phases[SATBFiltering] = new WorkerDataArray<double>(max_gc_threads, "SATB Filtering (ms):"); 66 67 _gc_par_phases[UpdateRS] = new WorkerDataArray<double>(max_gc_threads, "Update RS (ms):"); 68 if (G1HotCardCache::default_use_cache()) { 69 _gc_par_phases[ScanHCC] = new WorkerDataArray<double>(max_gc_threads, "Scan HCC (ms):"); 70 } else { 71 _gc_par_phases[ScanHCC] = NULL; 72 } 73 _gc_par_phases[ScanRS] = new WorkerDataArray<double>(max_gc_threads, "Scan RS (ms):"); 74 _gc_par_phases[CodeRoots] = new WorkerDataArray<double>(max_gc_threads, "Code Root Scanning (ms):"); 75 #if INCLUDE_AOT 76 _gc_par_phases[AOTCodeRoots] = new WorkerDataArray<double>(max_gc_threads, "AOT Root Scanning (ms):"); 77 #endif 78 _gc_par_phases[ObjCopy] = new WorkerDataArray<double>(max_gc_threads, "Object Copy (ms):"); 79 _gc_par_phases[Termination] = new WorkerDataArray<double>(max_gc_threads, "Termination (ms):"); 80 _gc_par_phases[GCWorkerTotal] = new WorkerDataArray<double>(max_gc_threads, "GC Worker Total (ms):"); 81 _gc_par_phases[GCWorkerEnd] = new WorkerDataArray<double>(max_gc_threads, "GC Worker End (ms):"); 82 _gc_par_phases[Other] = new WorkerDataArray<double>(max_gc_threads, "GC Worker Other (ms):"); 83 84 _scan_rs_scanned_cards = new WorkerDataArray<size_t>(max_gc_threads, "Scanned Cards:"); 85 _gc_par_phases[ScanRS]->link_thread_work_items(_scan_rs_scanned_cards, ScannedCards); 86 _scan_rs_claimed_cards = new WorkerDataArray<size_t>(max_gc_threads, "Claimed Cards:"); 87 _gc_par_phases[ScanRS]->link_thread_work_items(_scan_rs_claimed_cards, ClaimedCards); 88 _scan_rs_skipped_cards = new WorkerDataArray<size_t>(max_gc_threads, "Skipped Cards:"); 89 _gc_par_phases[ScanRS]->link_thread_work_items(_scan_rs_skipped_cards, SkippedCards); 90 91 _update_rs_processed_buffers = new WorkerDataArray<size_t>(max_gc_threads, "Processed Buffers:"); 92 _gc_par_phases[UpdateRS]->link_thread_work_items(_update_rs_processed_buffers); 93 94 _termination_attempts = new WorkerDataArray<size_t>(max_gc_threads, "Termination Attempts:"); 95 _gc_par_phases[Termination]->link_thread_work_items(_termination_attempts); 96 97 if (UseStringDeduplication) { 98 _gc_par_phases[StringDedupQueueFixup] = new WorkerDataArray<double>(max_gc_threads, "Queue Fixup (ms):"); 99 _gc_par_phases[StringDedupTableFixup] = new WorkerDataArray<double>(max_gc_threads, "Table Fixup (ms):"); 100 } else { 101 _gc_par_phases[StringDedupQueueFixup] = NULL; 102 _gc_par_phases[StringDedupTableFixup] = NULL; 103 } 104 105 _gc_par_phases[RedirtyCards] = new WorkerDataArray<double>(max_gc_threads, "Parallel Redirty (ms):"); 106 _redirtied_cards = new WorkerDataArray<size_t>(max_gc_threads, "Redirtied Cards:"); 107 _gc_par_phases[RedirtyCards]->link_thread_work_items(_redirtied_cards); 108 109 _gc_par_phases[YoungFreeCSet] = new WorkerDataArray<double>(max_gc_threads, "Young Free Collection Set (ms):"); 110 _gc_par_phases[NonYoungFreeCSet] = new WorkerDataArray<double>(max_gc_threads, "Non-Young Free Collection Set (ms):"); 111 112 _gc_par_phases[PreserveCMReferents] = new WorkerDataArray<double>(max_gc_threads, "Parallel Preserve CM Refs (ms):"); 113 114 reset(); 115 } 116 117 void G1GCPhaseTimes::reset() { 118 _cur_collection_par_time_ms = 0.0; 119 _cur_collection_code_root_fixup_time_ms = 0.0; 120 _cur_strong_code_root_purge_time_ms = 0.0; 121 _cur_evac_fail_recalc_used = 0.0; 122 _cur_evac_fail_remove_self_forwards = 0.0; 123 _cur_string_dedup_fixup_time_ms = 0.0; 124 _cur_prepare_tlab_time_ms = 0.0; 125 _cur_resize_tlab_time_ms = 0.0; 126 _cur_derived_pointer_table_update_time_ms = 0.0; 127 _cur_clear_ct_time_ms = 0.0; 128 _cur_expand_heap_time_ms = 0.0; 129 _cur_ref_proc_time_ms = 0.0; 130 _cur_ref_enq_time_ms = 0.0; 131 _cur_collection_start_sec = 0.0; 132 _root_region_scan_wait_time_ms = 0.0; 133 _external_accounted_time_ms = 0.0; 134 _recorded_clear_claimed_marks_time_ms = 0.0; 135 _recorded_young_cset_choice_time_ms = 0.0; 136 _recorded_non_young_cset_choice_time_ms = 0.0; 137 _recorded_redirty_logged_cards_time_ms = 0.0; 138 _recorded_preserve_cm_referents_time_ms = 0.0; 139 _recorded_merge_pss_time_ms = 0.0; 140 _recorded_start_new_cset_time_ms = 0.0; 141 _recorded_total_free_cset_time_ms = 0.0; 142 _recorded_serial_free_cset_time_ms = 0.0; 143 _cur_fast_reclaim_humongous_time_ms = 0.0; 144 _cur_fast_reclaim_humongous_register_time_ms = 0.0; 145 _cur_fast_reclaim_humongous_total = 0; 146 _cur_fast_reclaim_humongous_candidates = 0; 147 _cur_fast_reclaim_humongous_reclaimed = 0; 148 _cur_verify_before_time_ms = 0.0; 149 _cur_verify_after_time_ms = 0.0; 150 151 for (int i = 0; i < GCParPhasesSentinel; i++) { 152 if (_gc_par_phases[i] != NULL) { 153 _gc_par_phases[i]->reset(); 154 } 155 } 156 157 _ref_phase_times.reset(); 158 } 159 160 void G1GCPhaseTimes::note_gc_start() { 161 _gc_start_counter = os::elapsed_counter(); 162 reset(); 163 } 164 165 #define ASSERT_PHASE_UNINITIALIZED(phase) \ 166 assert(_gc_par_phases[phase]->get(i) == uninitialized, "Phase " #phase " reported for thread that was not started"); 167 168 double G1GCPhaseTimes::worker_time(GCParPhases phase, uint worker) { 169 double value = _gc_par_phases[phase]->get(worker); 170 if (value != WorkerDataArray<double>::uninitialized()) { 171 return value; 172 } 173 return 0.0; 174 } 175 176 void G1GCPhaseTimes::note_gc_end() { 177 _gc_pause_time_ms = TimeHelper::counter_to_millis(os::elapsed_counter() - _gc_start_counter); 178 179 double uninitialized = WorkerDataArray<double>::uninitialized(); 180 181 for (uint i = 0; i < _max_gc_threads; i++) { 182 double worker_start = _gc_par_phases[GCWorkerStart]->get(i); 183 if (worker_start != uninitialized) { 184 assert(_gc_par_phases[GCWorkerEnd]->get(i) != uninitialized, "Worker started but not ended."); 185 double total_worker_time = _gc_par_phases[GCWorkerEnd]->get(i) - _gc_par_phases[GCWorkerStart]->get(i); 186 record_time_secs(GCWorkerTotal, i , total_worker_time); 187 188 double worker_known_time = 189 worker_time(ExtRootScan, i) 190 + worker_time(SATBFiltering, i) 191 + worker_time(UpdateRS, i) 192 + worker_time(ScanRS, i) 193 + worker_time(CodeRoots, i) 194 + worker_time(ObjCopy, i) 195 + worker_time(Termination, i); 196 197 record_time_secs(Other, i, total_worker_time - worker_known_time); 198 } else { 199 // Make sure all slots are uninitialized since this thread did not seem to have been started 200 ASSERT_PHASE_UNINITIALIZED(GCWorkerEnd); 201 ASSERT_PHASE_UNINITIALIZED(ExtRootScan); 202 ASSERT_PHASE_UNINITIALIZED(SATBFiltering); 203 ASSERT_PHASE_UNINITIALIZED(UpdateRS); 204 ASSERT_PHASE_UNINITIALIZED(ScanRS); 205 ASSERT_PHASE_UNINITIALIZED(CodeRoots); 206 ASSERT_PHASE_UNINITIALIZED(ObjCopy); 207 ASSERT_PHASE_UNINITIALIZED(Termination); 208 } 209 } 210 } 211 212 #undef ASSERT_PHASE_UNINITIALIZED 213 214 // record the time a phase took in seconds 215 void G1GCPhaseTimes::record_time_secs(GCParPhases phase, uint worker_i, double secs) { 216 _gc_par_phases[phase]->set(worker_i, secs); 217 } 218 219 // add a number of seconds to a phase 220 void G1GCPhaseTimes::add_time_secs(GCParPhases phase, uint worker_i, double secs) { 221 _gc_par_phases[phase]->add(worker_i, secs); 222 } 223 224 void G1GCPhaseTimes::record_thread_work_item(GCParPhases phase, uint worker_i, size_t count, uint index) { 225 _gc_par_phases[phase]->set_thread_work_item(worker_i, count, index); 226 } 227 228 // return the average time for a phase in milliseconds 229 double G1GCPhaseTimes::average_time_ms(GCParPhases phase) { 230 return _gc_par_phases[phase]->average() * 1000.0; 231 } 232 233 size_t G1GCPhaseTimes::sum_thread_work_items(GCParPhases phase, uint index) { 234 assert(_gc_par_phases[phase]->thread_work_items(index) != NULL, "No sub count"); 235 return _gc_par_phases[phase]->thread_work_items(index)->sum(); 236 } 237 238 template <class T> 239 void G1GCPhaseTimes::details(T* phase, const char* indent) const { 240 LogTarget(Trace, gc, phases, task) lt; 241 if (lt.is_enabled()) { 242 LogStream ls(lt); 243 ls.print("%s", indent); 244 phase->print_details_on(&ls); 245 } 246 } 247 248 void G1GCPhaseTimes::log_phase(WorkerDataArray<double>* phase, uint indent, outputStream* out, bool print_sum) const { 249 out->print("%s", Indents[indent]); 250 phase->print_summary_on(out, print_sum); 251 details(phase, Indents[indent]); 252 253 for (uint i = 0; i < phase->MaxThreadWorkItems; i++) { 254 WorkerDataArray<size_t>* work_items = phase->thread_work_items(i); 255 if (work_items != NULL) { 256 out->print("%s", Indents[indent + 1]); 257 work_items->print_summary_on(out, true); 258 details(work_items, Indents[indent + 1]); 259 } 260 } 261 } 262 263 void G1GCPhaseTimes::debug_phase(WorkerDataArray<double>* phase) const { 264 LogTarget(Debug, gc, phases) lt; 265 if (lt.is_enabled()) { 266 ResourceMark rm; 267 LogStream ls(lt); 268 log_phase(phase, 2, &ls, true); 269 } 270 } 271 272 void G1GCPhaseTimes::trace_phase(WorkerDataArray<double>* phase, bool print_sum) const { 273 LogTarget(Trace, gc, phases) lt; 274 if (lt.is_enabled()) { 275 LogStream ls(lt); 276 log_phase(phase, 3, &ls, print_sum); 277 } 278 } 279 280 #define TIME_FORMAT "%.1lfms" 281 282 void G1GCPhaseTimes::info_time(const char* name, double value) const { 283 log_info(gc, phases)("%s%s: " TIME_FORMAT, Indents[1], name, value); 284 } 285 286 void G1GCPhaseTimes::debug_time(const char* name, double value) const { 287 log_debug(gc, phases)("%s%s: " TIME_FORMAT, Indents[2], name, value); 288 } 289 290 void G1GCPhaseTimes::debug_time_for_reference(const char* name, double value) const { 291 LogTarget(Debug, gc, phases) lt; 292 LogTarget(Debug, gc, phases, ref) lt2; 293 294 if (lt.is_enabled()) { 295 LogStream ls(lt); 296 ls.print_cr("%s%s: " TIME_FORMAT, Indents[2], name, value); 297 } else if (lt2.is_enabled()) { 298 LogStream ls(lt2); 299 ls.print_cr("%s%s: " TIME_FORMAT, Indents[2], name, value); 300 } 301 } 302 303 void G1GCPhaseTimes::trace_time(const char* name, double value) const { 304 log_trace(gc, phases)("%s%s: " TIME_FORMAT, Indents[3], name, value); 305 } 306 307 void G1GCPhaseTimes::trace_count(const char* name, size_t value) const { 308 log_trace(gc, phases)("%s%s: " SIZE_FORMAT, Indents[3], name, value); 309 } 310 311 double G1GCPhaseTimes::print_pre_evacuate_collection_set() const { 312 const double sum_ms = _root_region_scan_wait_time_ms + 313 _recorded_young_cset_choice_time_ms + 314 _recorded_non_young_cset_choice_time_ms + 315 _cur_fast_reclaim_humongous_register_time_ms + 316 _recorded_clear_claimed_marks_time_ms; 317 318 info_time("Pre Evacuate Collection Set", sum_ms); 319 320 if (_root_region_scan_wait_time_ms > 0.0) { 321 debug_time("Root Region Scan Waiting", _root_region_scan_wait_time_ms); 322 } 323 debug_time("Prepare TLABs", _cur_prepare_tlab_time_ms); 324 debug_time("Choose Collection Set", (_recorded_young_cset_choice_time_ms + _recorded_non_young_cset_choice_time_ms)); 325 if (G1EagerReclaimHumongousObjects) { 326 debug_time("Humongous Register", _cur_fast_reclaim_humongous_register_time_ms); 327 trace_count("Humongous Total", _cur_fast_reclaim_humongous_total); 328 trace_count("Humongous Candidate", _cur_fast_reclaim_humongous_candidates); 329 } 330 331 if (_recorded_clear_claimed_marks_time_ms > 0.0) { 332 debug_time("Clear Claimed Marks", _recorded_clear_claimed_marks_time_ms); 333 } 334 return sum_ms; 335 } 336 337 double G1GCPhaseTimes::print_evacuate_collection_set() const { 338 const double sum_ms = _cur_collection_par_time_ms; 339 340 info_time("Evacuate Collection Set", sum_ms); 341 342 trace_phase(_gc_par_phases[GCWorkerStart], false); 343 debug_phase(_gc_par_phases[ExtRootScan]); 344 for (int i = ThreadRoots; i <= SATBFiltering; i++) { 345 trace_phase(_gc_par_phases[i]); 346 } 347 debug_phase(_gc_par_phases[UpdateRS]); 348 if (G1HotCardCache::default_use_cache()) { 349 trace_phase(_gc_par_phases[ScanHCC]); 350 } 351 debug_phase(_gc_par_phases[ScanRS]); 352 debug_phase(_gc_par_phases[CodeRoots]); 353 #if INCLUDE_AOT 354 debug_phase(_gc_par_phases[AOTCodeRoots]); 355 #endif 356 debug_phase(_gc_par_phases[ObjCopy]); 357 debug_phase(_gc_par_phases[Termination]); 358 debug_phase(_gc_par_phases[Other]); 359 debug_phase(_gc_par_phases[GCWorkerTotal]); 360 trace_phase(_gc_par_phases[GCWorkerEnd], false); 361 362 return sum_ms; 363 } 364 365 double G1GCPhaseTimes::print_post_evacuate_collection_set() const { 366 const double evac_fail_handling = _cur_evac_fail_recalc_used + 367 _cur_evac_fail_remove_self_forwards; 368 const double sum_ms = evac_fail_handling + 369 _cur_collection_code_root_fixup_time_ms + 370 _recorded_preserve_cm_referents_time_ms + 371 _cur_ref_proc_time_ms + 372 _cur_ref_enq_time_ms + 373 _cur_clear_ct_time_ms + 374 _recorded_merge_pss_time_ms + 375 _cur_strong_code_root_purge_time_ms + 376 _recorded_redirty_logged_cards_time_ms + 377 _recorded_total_free_cset_time_ms + 378 _cur_fast_reclaim_humongous_time_ms + 379 _cur_expand_heap_time_ms + 380 _cur_string_dedup_fixup_time_ms; 381 382 info_time("Post Evacuate Collection Set", sum_ms); 383 384 debug_time("Code Roots Fixup", _cur_collection_code_root_fixup_time_ms); 385 386 debug_time("Preserve CM Refs", _recorded_preserve_cm_referents_time_ms); 387 trace_phase(_gc_par_phases[PreserveCMReferents]); 388 389 debug_time_for_reference("Reference Processing", _cur_ref_proc_time_ms); 390 _ref_phase_times.print_all_references(2, false); 391 392 if (G1StringDedup::is_enabled()) { 393 debug_time("String Dedup Fixup", _cur_string_dedup_fixup_time_ms); 394 debug_phase(_gc_par_phases[StringDedupQueueFixup]); 395 debug_phase(_gc_par_phases[StringDedupTableFixup]); 396 } 397 398 debug_time("Clear Card Table", _cur_clear_ct_time_ms); 399 400 if (G1CollectedHeap::heap()->evacuation_failed()) { 401 debug_time("Evacuation Failure", evac_fail_handling); 402 trace_time("Recalculate Used", _cur_evac_fail_recalc_used); 403 trace_time("Remove Self Forwards",_cur_evac_fail_remove_self_forwards); 404 } 405 406 debug_time_for_reference("Reference Enqueuing", _cur_ref_enq_time_ms); 407 _ref_phase_times.print_enqueue_phase(2, false); 408 409 debug_time("Merge Per-Thread State", _recorded_merge_pss_time_ms); 410 debug_time("Code Roots Purge", _cur_strong_code_root_purge_time_ms); 411 412 debug_time("Redirty Cards", _recorded_redirty_logged_cards_time_ms); 413 trace_phase(_gc_par_phases[RedirtyCards]); 414 #if defined(COMPILER2) || INCLUDE_JVMCI 415 debug_time("DerivedPointerTable Update", _cur_derived_pointer_table_update_time_ms); 416 #endif 417 418 debug_time("Free Collection Set", _recorded_total_free_cset_time_ms); 419 trace_time("Free Collection Set Serial", _recorded_serial_free_cset_time_ms); 420 trace_phase(_gc_par_phases[YoungFreeCSet]); 421 trace_phase(_gc_par_phases[NonYoungFreeCSet]); 422 423 if (G1EagerReclaimHumongousObjects) { 424 debug_time("Humongous Reclaim", _cur_fast_reclaim_humongous_time_ms); 425 trace_count("Humongous Reclaimed", _cur_fast_reclaim_humongous_reclaimed); 426 } 427 debug_time("Start New Collection Set", _recorded_start_new_cset_time_ms); 428 if (UseTLAB && ResizeTLAB) { 429 debug_time("Resize TLABs", _cur_resize_tlab_time_ms); 430 } 431 debug_time("Expand Heap After Collection", _cur_expand_heap_time_ms); 432 433 434 return sum_ms; 435 } 436 437 void G1GCPhaseTimes::print_other(double accounted_ms) const { 438 info_time("Other", _gc_pause_time_ms - accounted_ms); 439 } 440 441 void G1GCPhaseTimes::print() { 442 note_gc_end(); 443 444 if (_cur_verify_before_time_ms > 0.0) { 445 debug_time("Verify Before", _cur_verify_before_time_ms); 446 } 447 448 double accounted_ms = 0.0; 449 accounted_ms += print_pre_evacuate_collection_set(); 450 accounted_ms += print_evacuate_collection_set(); 451 accounted_ms += print_post_evacuate_collection_set(); 452 print_other(accounted_ms); 453 454 if (_cur_verify_after_time_ms > 0.0) { 455 debug_time("Verify After", _cur_verify_after_time_ms); 456 } 457 } 458 459 G1GCParPhaseTimesTracker::G1GCParPhaseTimesTracker(G1GCPhaseTimes* phase_times, G1GCPhaseTimes::GCParPhases phase, uint worker_id) : 460 _phase_times(phase_times), _phase(phase), _worker_id(worker_id) { 461 if (_phase_times != NULL) { 462 _start_time = os::elapsedTime(); 463 } 464 } 465 466 G1GCParPhaseTimesTracker::~G1GCParPhaseTimesTracker() { 467 if (_phase_times != NULL) { 468 _phase_times->record_time_secs(_phase, _worker_id, os::elapsedTime() - _start_time); 469 } 470 } 471