1 /* 2 * Copyright (c) 2013, 2016, 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 { 41 assert(max_gc_threads > 0, "Must have some GC threads"); 42 43 _gc_par_phases[GCWorkerStart] = new WorkerDataArray<double>(max_gc_threads, "GC Worker Start (ms):"); 44 _gc_par_phases[ExtRootScan] = new WorkerDataArray<double>(max_gc_threads, "Ext Root Scanning (ms):"); 45 46 // Root scanning phases 47 _gc_par_phases[ThreadRoots] = new WorkerDataArray<double>(max_gc_threads, "Thread Roots (ms):"); 48 _gc_par_phases[StringTableRoots] = new WorkerDataArray<double>(max_gc_threads, "StringTable Roots (ms):"); 49 _gc_par_phases[UniverseRoots] = new WorkerDataArray<double>(max_gc_threads, "Universe Roots (ms):"); 50 _gc_par_phases[JNIRoots] = new WorkerDataArray<double>(max_gc_threads, "JNI Handles Roots (ms):"); 51 _gc_par_phases[ObjectSynchronizerRoots] = new WorkerDataArray<double>(max_gc_threads, "ObjectSynchronizer Roots (ms):"); 52 _gc_par_phases[FlatProfilerRoots] = new WorkerDataArray<double>(max_gc_threads, "FlatProfiler Roots (ms):"); 53 _gc_par_phases[ManagementRoots] = new WorkerDataArray<double>(max_gc_threads, "Management Roots (ms):"); 54 _gc_par_phases[SystemDictionaryRoots] = new WorkerDataArray<double>(max_gc_threads, "SystemDictionary Roots (ms):"); 55 _gc_par_phases[CLDGRoots] = new WorkerDataArray<double>(max_gc_threads, "CLDG Roots (ms):"); 56 _gc_par_phases[JVMTIRoots] = new WorkerDataArray<double>(max_gc_threads, "JVMTI Roots (ms):"); 57 _gc_par_phases[CMRefRoots] = new WorkerDataArray<double>(max_gc_threads, "CM RefProcessor Roots (ms):"); 58 _gc_par_phases[WaitForStrongCLD] = new WorkerDataArray<double>(max_gc_threads, "Wait For Strong CLD (ms):"); 59 _gc_par_phases[WeakCLDRoots] = new WorkerDataArray<double>(max_gc_threads, "Weak CLD Roots (ms):"); 60 _gc_par_phases[SATBFiltering] = new WorkerDataArray<double>(max_gc_threads, "SATB Filtering (ms):"); 61 62 _gc_par_phases[UpdateRS] = new WorkerDataArray<double>(max_gc_threads, "Update RS (ms):"); 63 if (G1HotCardCache::default_use_cache()) { 64 _gc_par_phases[ScanHCC] = new WorkerDataArray<double>(max_gc_threads, "Scan HCC (ms):"); 65 } else { 66 _gc_par_phases[ScanHCC] = NULL; 67 } 68 _gc_par_phases[ScanRS] = new WorkerDataArray<double>(max_gc_threads, "Scan RS (ms):"); 69 _gc_par_phases[CodeRoots] = new WorkerDataArray<double>(max_gc_threads, "Code Root Scanning (ms):"); 70 _gc_par_phases[ObjCopy] = new WorkerDataArray<double>(max_gc_threads, "Object Copy (ms):"); 71 _gc_par_phases[Termination] = new WorkerDataArray<double>(max_gc_threads, "Termination (ms):"); 72 _gc_par_phases[GCWorkerTotal] = new WorkerDataArray<double>(max_gc_threads, "GC Worker Total (ms):"); 73 _gc_par_phases[GCWorkerEnd] = new WorkerDataArray<double>(max_gc_threads, "GC Worker End (ms):"); 74 _gc_par_phases[Other] = new WorkerDataArray<double>(max_gc_threads, "GC Worker Other (ms):"); 75 76 _update_rs_processed_buffers = new WorkerDataArray<size_t>(max_gc_threads, "Processed Buffers:"); 77 _gc_par_phases[UpdateRS]->link_thread_work_items(_update_rs_processed_buffers); 78 79 _termination_attempts = new WorkerDataArray<size_t>(max_gc_threads, "Termination Attempts:"); 80 _gc_par_phases[Termination]->link_thread_work_items(_termination_attempts); 81 82 if (UseStringDeduplication) { 83 _gc_par_phases[StringDedupQueueFixup] = new WorkerDataArray<double>(max_gc_threads, "Queue Fixup (ms):"); 84 _gc_par_phases[StringDedupTableFixup] = new WorkerDataArray<double>(max_gc_threads, "Table Fixup (ms):"); 85 } else { 86 _gc_par_phases[StringDedupQueueFixup] = NULL; 87 _gc_par_phases[StringDedupTableFixup] = NULL; 88 } 89 90 _gc_par_phases[RedirtyCards] = new WorkerDataArray<double>(max_gc_threads, "Parallel Redirty (ms):"); 91 _redirtied_cards = new WorkerDataArray<size_t>(max_gc_threads, "Redirtied Cards:"); 92 _gc_par_phases[RedirtyCards]->link_thread_work_items(_redirtied_cards); 93 94 _gc_par_phases[YoungFreeCSet] = new WorkerDataArray<double>(max_gc_threads, "Young Free Collection Set (ms):"); 95 _gc_par_phases[NonYoungFreeCSet] = new WorkerDataArray<double>(max_gc_threads, "Non-Young Free Collection Set (ms):"); 96 97 _gc_par_phases[PreserveCMReferents] = new WorkerDataArray<double>(max_gc_threads, "Parallel Preserve CM Refs (ms):"); 98 } 99 100 void G1GCPhaseTimes::note_gc_start() { 101 _gc_start_counter = os::elapsed_counter(); 102 _cur_expand_heap_time_ms = 0.0; 103 _external_accounted_time_ms = 0.0; 104 105 for (int i = 0; i < GCParPhasesSentinel; i++) { 106 if (_gc_par_phases[i] != NULL) { 107 _gc_par_phases[i]->reset(); 108 } 109 } 110 } 111 112 #define ASSERT_PHASE_UNINITIALIZED(phase) \ 113 assert(_gc_par_phases[phase]->get(i) == uninitialized, "Phase " #phase " reported for thread that was not started"); 114 115 double G1GCPhaseTimes::worker_time(GCParPhases phase, uint worker) { 116 double value = _gc_par_phases[phase]->get(worker); 117 if (value != WorkerDataArray<double>::uninitialized()) { 118 return value; 119 } 120 return 0.0; 121 } 122 123 void G1GCPhaseTimes::note_gc_end() { 124 _gc_pause_time_ms = TimeHelper::counter_to_millis(os::elapsed_counter() - _gc_start_counter); 125 126 double uninitialized = WorkerDataArray<double>::uninitialized(); 127 128 for (uint i = 0; i < _max_gc_threads; i++) { 129 double worker_start = _gc_par_phases[GCWorkerStart]->get(i); 130 if (worker_start != uninitialized) { 131 assert(_gc_par_phases[GCWorkerEnd]->get(i) != uninitialized, "Worker started but not ended."); 132 double total_worker_time = _gc_par_phases[GCWorkerEnd]->get(i) - _gc_par_phases[GCWorkerStart]->get(i); 133 record_time_secs(GCWorkerTotal, i , total_worker_time); 134 135 double worker_known_time = 136 worker_time(ExtRootScan, i) 137 + worker_time(SATBFiltering, i) 138 + worker_time(UpdateRS, i) 139 + worker_time(ScanRS, i) 140 + worker_time(CodeRoots, i) 141 + worker_time(ObjCopy, i) 142 + worker_time(Termination, i); 143 144 record_time_secs(Other, i, total_worker_time - worker_known_time); 145 } else { 146 // Make sure all slots are uninitialized since this thread did not seem to have been started 147 ASSERT_PHASE_UNINITIALIZED(GCWorkerEnd); 148 ASSERT_PHASE_UNINITIALIZED(ExtRootScan); 149 ASSERT_PHASE_UNINITIALIZED(SATBFiltering); 150 ASSERT_PHASE_UNINITIALIZED(UpdateRS); 151 ASSERT_PHASE_UNINITIALIZED(ScanRS); 152 ASSERT_PHASE_UNINITIALIZED(CodeRoots); 153 ASSERT_PHASE_UNINITIALIZED(ObjCopy); 154 ASSERT_PHASE_UNINITIALIZED(Termination); 155 } 156 } 157 } 158 159 #undef ASSERT_PHASE_UNINITIALIZED 160 161 // record the time a phase took in seconds 162 void G1GCPhaseTimes::record_time_secs(GCParPhases phase, uint worker_i, double secs) { 163 _gc_par_phases[phase]->set(worker_i, secs); 164 } 165 166 // add a number of seconds to a phase 167 void G1GCPhaseTimes::add_time_secs(GCParPhases phase, uint worker_i, double secs) { 168 _gc_par_phases[phase]->add(worker_i, secs); 169 } 170 171 void G1GCPhaseTimes::record_thread_work_item(GCParPhases phase, uint worker_i, size_t count) { 172 _gc_par_phases[phase]->set_thread_work_item(worker_i, count); 173 } 174 175 // return the average time for a phase in milliseconds 176 double G1GCPhaseTimes::average_time_ms(GCParPhases phase) { 177 return _gc_par_phases[phase]->average() * 1000.0; 178 } 179 180 size_t G1GCPhaseTimes::sum_thread_work_items(GCParPhases phase) { 181 assert(_gc_par_phases[phase]->thread_work_items() != NULL, "No sub count"); 182 return _gc_par_phases[phase]->thread_work_items()->sum(); 183 } 184 185 template <class T> 186 void G1GCPhaseTimes::details(T* phase, const char* indent) { 187 Log(gc, phases, task) log; 188 if (log.is_level(LogLevel::Trace)) { 189 outputStream* trace_out = log.trace_stream(); 190 trace_out->print("%s", indent); 191 phase->print_details_on(trace_out); 192 } 193 } 194 195 void G1GCPhaseTimes::log_phase(WorkerDataArray<double>* phase, uint indent, outputStream* out, bool print_sum) { 196 out->print("%s", Indents[indent]); 197 phase->print_summary_on(out, print_sum); 198 details(phase, Indents[indent]); 199 200 WorkerDataArray<size_t>* work_items = phase->thread_work_items(); 201 if (work_items != NULL) { 202 out->print("%s", Indents[indent + 1]); 203 work_items->print_summary_on(out, true); 204 details(work_items, Indents[indent + 1]); 205 } 206 } 207 208 void G1GCPhaseTimes::debug_phase(WorkerDataArray<double>* phase) { 209 Log(gc, phases) log; 210 if (log.is_level(LogLevel::Debug)) { 211 ResourceMark rm; 212 log_phase(phase, 2, log.debug_stream(), true); 213 } 214 } 215 216 void G1GCPhaseTimes::trace_phase(WorkerDataArray<double>* phase, bool print_sum) { 217 Log(gc, phases) log; 218 if (log.is_level(LogLevel::Trace)) { 219 ResourceMark rm; 220 log_phase(phase, 3, log.trace_stream(), print_sum); 221 } 222 } 223 224 #define PHASE_DOUBLE_FORMAT "%s%s: %.1lfms" 225 #define PHASE_SIZE_FORMAT "%s%s: " SIZE_FORMAT 226 227 #define info_line(str, value) \ 228 log_info(gc, phases)(PHASE_DOUBLE_FORMAT, Indents[1], str, value); 229 230 #define debug_line(str, value) \ 231 log_debug(gc, phases)(PHASE_DOUBLE_FORMAT, Indents[2], str, value); 232 233 #define trace_line(str, value) \ 234 log_trace(gc, phases)(PHASE_DOUBLE_FORMAT, Indents[3], str, value); 235 236 #define trace_line_sz(str, value) \ 237 log_trace(gc, phases)(PHASE_SIZE_FORMAT, Indents[3], str, value); 238 239 #define trace_line_ms(str, value) \ 240 log_trace(gc, phases)(PHASE_SIZE_FORMAT, Indents[3], str, value); 241 242 #define info_line_and_account(str, value) \ 243 info_line(str, value); \ 244 accounted_time_ms += value; 245 246 void G1GCPhaseTimes::print() { 247 note_gc_end(); 248 249 double accounted_time_ms = _external_accounted_time_ms; 250 if (_root_region_scan_wait_time_ms > 0.0) { 251 info_line_and_account("Root Region Scan Waiting", _root_region_scan_wait_time_ms); 252 } 253 254 info_line_and_account("Evacuate Collection Set", _cur_collection_par_time_ms); 255 trace_phase(_gc_par_phases[GCWorkerStart], false); 256 debug_phase(_gc_par_phases[ExtRootScan]); 257 for (int i = ThreadRoots; i <= SATBFiltering; i++) { 258 trace_phase(_gc_par_phases[i]); 259 } 260 debug_phase(_gc_par_phases[UpdateRS]); 261 if (G1HotCardCache::default_use_cache()) { 262 trace_phase(_gc_par_phases[ScanHCC]); 263 } 264 debug_phase(_gc_par_phases[ScanRS]); 265 debug_phase(_gc_par_phases[CodeRoots]); 266 debug_phase(_gc_par_phases[ObjCopy]); 267 debug_phase(_gc_par_phases[Termination]); 268 debug_phase(_gc_par_phases[Other]); 269 debug_phase(_gc_par_phases[GCWorkerTotal]); 270 trace_phase(_gc_par_phases[GCWorkerEnd], false); 271 272 info_line_and_account("Code Roots", _cur_collection_code_root_fixup_time_ms + _cur_strong_code_root_purge_time_ms); 273 debug_line("Code Roots Fixup", _cur_collection_code_root_fixup_time_ms); 274 debug_line("Code Roots Purge", _cur_strong_code_root_purge_time_ms); 275 276 if (G1StringDedup::is_enabled()) { 277 info_line_and_account("String Dedup Fixup", _cur_string_dedup_fixup_time_ms); 278 debug_phase(_gc_par_phases[StringDedupQueueFixup]); 279 debug_phase(_gc_par_phases[StringDedupTableFixup]); 280 } 281 info_line_and_account("Clear Card Table", _cur_clear_ct_time_ms); 282 info_line_and_account("Expand Heap After Collection", _cur_expand_heap_time_ms); 283 284 info_line_and_account("Free Collection Set", _recorded_total_free_cset_time_ms); 285 debug_line("Free Collection Set Serial", _recorded_serial_free_cset_time_ms); 286 debug_phase(_gc_par_phases[YoungFreeCSet]); 287 debug_phase(_gc_par_phases[NonYoungFreeCSet]); 288 289 info_line_and_account("Merge Per-Thread State", _recorded_merge_pss_time_ms); 290 291 info_line("Other", _gc_pause_time_ms - accounted_time_ms); 292 if (_cur_verify_before_time_ms > 0.0) { 293 debug_line("Verify Before", _cur_verify_before_time_ms); 294 } 295 if (G1CollectedHeap::heap()->evacuation_failed()) { 296 double evac_fail_handling = _cur_evac_fail_recalc_used + _cur_evac_fail_remove_self_forwards + 297 _cur_evac_fail_restore_remsets; 298 debug_line("Evacuation Failure", evac_fail_handling); 299 trace_line("Recalculate Used", _cur_evac_fail_recalc_used); 300 trace_line("Remove Self Forwards",_cur_evac_fail_remove_self_forwards); 301 trace_line("Restore RemSet", _cur_evac_fail_restore_remsets); 302 } 303 debug_line("Choose CSet", (_recorded_young_cset_choice_time_ms + _recorded_non_young_cset_choice_time_ms)); 304 debug_line("Preserve CM Refs", _recorded_preserve_cm_referents_time_ms); 305 trace_phase(_gc_par_phases[PreserveCMReferents]); 306 debug_line("Reference Processing", _cur_ref_proc_time_ms); 307 debug_line("Reference Enqueuing", _cur_ref_enq_time_ms); 308 debug_line("Redirty Cards", _recorded_redirty_logged_cards_time_ms); 309 trace_phase(_gc_par_phases[RedirtyCards]); 310 if (G1EagerReclaimHumongousObjects) { 311 debug_line("Humongous Register", _cur_fast_reclaim_humongous_register_time_ms); 312 trace_line_sz("Humongous Total", _cur_fast_reclaim_humongous_total); 313 trace_line_sz("Humongous Candidate", _cur_fast_reclaim_humongous_candidates); 314 debug_line("Humongous Reclaim", _cur_fast_reclaim_humongous_time_ms); 315 trace_line_sz("Humongous Reclaimed", _cur_fast_reclaim_humongous_reclaimed); 316 } 317 if (_cur_verify_after_time_ms > 0.0) { 318 debug_line("Verify After", _cur_verify_after_time_ms); 319 } 320 } 321 322 G1GCParPhaseTimesTracker::G1GCParPhaseTimesTracker(G1GCPhaseTimes* phase_times, G1GCPhaseTimes::GCParPhases phase, uint worker_id) : 323 _phase_times(phase_times), _phase(phase), _worker_id(worker_id) { 324 if (_phase_times != NULL) { 325 _start_time = os::elapsedTime(); 326 } 327 } 328 329 G1GCParPhaseTimesTracker::~G1GCParPhaseTimesTracker() { 330 if (_phase_times != NULL) { 331 _phase_times->record_time_secs(_phase, _worker_id, os::elapsedTime() - _start_time); 332 } 333 } 334