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