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