1 /* 2 * Copyright (c) 2013, 2015 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 26 #include "precompiled.hpp" 27 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 28 #include "gc_implementation/g1/g1GCPhaseTimes.hpp" 29 #include "gc_implementation/g1/g1Log.hpp" 30 #include "gc_implementation/g1/g1StringDedup.hpp" 31 #include "runtime/atomic.inline.hpp" 32 33 // Helper class for avoiding interleaved logging 34 class LineBuffer: public StackObj { 35 36 private: 37 static const int BUFFER_LEN = 1024; 38 static const int INDENT_CHARS = 3; 39 char _buffer[BUFFER_LEN]; 40 int _indent_level; 41 int _cur; 42 43 void vappend(const char* format, va_list ap) ATTRIBUTE_PRINTF(2, 0) { 44 int res = vsnprintf(&_buffer[_cur], BUFFER_LEN - _cur, format, ap); 45 if (res != -1) { 46 _cur += res; 47 } else { 48 DEBUG_ONLY(warning("buffer too small in LineBuffer");) 49 _buffer[BUFFER_LEN -1] = 0; 50 _cur = BUFFER_LEN; // vsnprintf above should not add to _buffer if we are called again 51 } 52 } 53 54 public: 55 explicit LineBuffer(int indent_level): _indent_level(indent_level), _cur(0) { 56 for (; (_cur < BUFFER_LEN && _cur < (_indent_level * INDENT_CHARS)); _cur++) { 57 _buffer[_cur] = ' '; 58 } 59 } 60 61 #ifndef PRODUCT 62 ~LineBuffer() { 63 assert(_cur == _indent_level * INDENT_CHARS, "pending data in buffer - append_and_print_cr() not called?"); 64 } 65 #endif 66 67 void append(const char* format, ...) ATTRIBUTE_PRINTF(2, 3) { 68 va_list ap; 69 va_start(ap, format); 70 vappend(format, ap); 71 va_end(ap); 72 } 73 74 void append_and_print_cr(const char* format, ...) ATTRIBUTE_PRINTF(2, 3) { 75 va_list ap; 76 va_start(ap, format); 77 vappend(format, ap); 78 va_end(ap); 79 gclog_or_tty->print_cr("%s", _buffer); 80 _cur = _indent_level * INDENT_CHARS; 81 } 82 }; 83 84 PRAGMA_DIAG_PUSH 85 PRAGMA_FORMAT_NONLITERAL_IGNORED 86 template <class T> 87 void WorkerDataArray<T>::print(int level, const char* title) { 88 if (_length == 1) { 89 // No need for min, max, average and sum for only one worker 90 LineBuffer buf(level); 91 buf.append("[%s: ", title); 92 buf.append(_print_format, _data[0]); 93 buf.append_and_print_cr("]"); 94 return; 95 } 96 97 T min = _data[0]; 98 T max = _data[0]; 99 T sum = 0; 100 101 LineBuffer buf(level); 102 buf.append("[%s:", title); 103 for (uint i = 0; i < _length; ++i) { 104 T val = _data[i]; 105 min = MIN2(val, min); 106 max = MAX2(val, max); 107 sum += val; 108 if (G1Log::finest()) { 109 buf.append(" "); 110 buf.append(_print_format, val); 111 } 112 } 113 114 if (G1Log::finest()) { 115 buf.append_and_print_cr("%s", ""); 116 } 117 118 double avg = (double)sum / (double)_length; 119 buf.append(" Min: "); 120 buf.append(_print_format, min); 121 buf.append(", Avg: "); 122 buf.append("%.1lf", avg); // Always print average as a double 123 buf.append(", Max: "); 124 buf.append(_print_format, max); 125 buf.append(", Diff: "); 126 buf.append(_print_format, max - min); 127 if (_print_sum) { 128 // for things like the start and end times the sum is not 129 // that relevant 130 buf.append(", Sum: "); 131 buf.append(_print_format, sum); 132 } 133 buf.append_and_print_cr("]"); 134 } 135 PRAGMA_DIAG_POP 136 137 #ifndef PRODUCT 138 139 template <> const int WorkerDataArray<int>::_uninitialized = -1; 140 template <> const double WorkerDataArray<double>::_uninitialized = -1.0; 141 template <> const size_t WorkerDataArray<size_t>::_uninitialized = (size_t)-1; 142 143 template <class T> 144 void WorkerDataArray<T>::reset() { 145 for (uint i = 0; i < _length; i++) { 146 _data[i] = (T)_uninitialized; 147 } 148 } 149 150 template <class T> 151 void WorkerDataArray<T>::verify() { 152 for (uint i = 0; i < _length; i++) { 153 assert(_data[i] != _uninitialized, 154 err_msg("Invalid data for worker %u, data: %lf, uninitialized: %lf", 155 i, (double)_data[i], (double)_uninitialized)); 156 } 157 } 158 159 #endif 160 161 G1GCPhaseTimes::G1GCPhaseTimes(uint max_gc_threads, uint num_ext_root_scan_phases) : 162 _max_gc_threads(max_gc_threads), 163 _num_ext_root_scan_phases(num_ext_root_scan_phases), 164 _last_gc_worker_start_times_ms(_max_gc_threads, "%.1lf", false), 165 _last_ext_root_scan_times_ms(_max_gc_threads, "%.1lf"), 166 _last_ext_root_scan_phase_times_ms(NULL), 167 _last_satb_filtering_times_ms(_max_gc_threads, "%.1lf"), 168 _last_update_rs_times_ms(_max_gc_threads, "%.1lf"), 169 _last_update_rs_processed_buffers(_max_gc_threads, "%d"), 170 _last_scan_rs_times_ms(_max_gc_threads, "%.1lf"), 171 _last_strong_code_root_scan_times_ms(_max_gc_threads, "%.1lf"), 172 _last_obj_copy_times_ms(_max_gc_threads, "%.1lf"), 173 _last_termination_times_ms(_max_gc_threads, "%.1lf"), 174 _last_termination_attempts(_max_gc_threads, SIZE_FORMAT), 175 _last_gc_worker_end_times_ms(_max_gc_threads, "%.1lf", false), 176 _last_gc_worker_times_ms(_max_gc_threads, "%.1lf"), 177 _last_gc_worker_other_times_ms(_max_gc_threads, "%.1lf"), 178 _last_redirty_logged_cards_time_ms(_max_gc_threads, "%.1lf"), 179 _last_redirty_logged_cards_processed_cards(_max_gc_threads, SIZE_FORMAT), 180 _cur_string_dedup_queue_fixup_worker_times_ms(_max_gc_threads, "%.1lf"), 181 _cur_string_dedup_table_fixup_worker_times_ms(_max_gc_threads, "%.1lf") 182 { 183 assert(max_gc_threads > 0, "Must have some GC threads"); 184 if (track_ext_root_scan_phases()) { 185 _last_ext_root_scan_phase_times_ms = NEW_C_HEAP_ARRAY(WorkerDataArray<double>*, num_ext_root_scan_phases, mtGC); 186 for (uint i = 0; i < num_ext_root_scan_phases; i++) { 187 _last_ext_root_scan_phase_times_ms[i] = new WorkerDataArray<double>(_max_gc_threads, "%.1lf"); 188 } 189 } 190 } 191 192 G1GCPhaseTimes::~G1GCPhaseTimes() { 193 if (track_ext_root_scan_phases()) { 194 for (uint i = 0; i < _num_ext_root_scan_phases; i++) { 195 delete _last_ext_root_scan_phase_times_ms[i]; 196 } 197 FREE_C_HEAP_ARRAY(WorkerDataArray<double>*, _last_ext_root_scan_phase_times_ms); 198 } 199 } 200 201 void G1GCPhaseTimes::note_gc_start(uint active_gc_threads) { 202 assert(active_gc_threads > 0, "The number of threads must be > 0"); 203 assert(active_gc_threads <= _max_gc_threads, "The number of active threads must be <= the max nubmer of threads"); 204 _active_gc_threads = active_gc_threads; 205 206 _last_gc_worker_start_times_ms.reset(); 207 _last_ext_root_scan_times_ms.reset(); 208 _last_satb_filtering_times_ms.reset(); 209 _last_update_rs_times_ms.reset(); 210 _last_update_rs_processed_buffers.reset(); 211 _last_scan_rs_times_ms.reset(); 212 _last_strong_code_root_scan_times_ms.reset(); 213 _last_obj_copy_times_ms.reset(); 214 _last_termination_times_ms.reset(); 215 _last_termination_attempts.reset(); 216 _last_gc_worker_end_times_ms.reset(); 217 _last_gc_worker_times_ms.reset(); 218 _last_gc_worker_other_times_ms.reset(); 219 220 _last_redirty_logged_cards_time_ms.reset(); 221 _last_redirty_logged_cards_processed_cards.reset(); 222 223 for (uint i = 0; i < _num_ext_root_scan_phases; i++) { 224 _last_ext_root_scan_phase_times_ms[i]->reset(); 225 } 226 } 227 228 void G1GCPhaseTimes::note_gc_end() { 229 _last_gc_worker_start_times_ms.verify(); 230 _last_ext_root_scan_times_ms.verify(); 231 _last_satb_filtering_times_ms.verify(); 232 _last_update_rs_times_ms.verify(); 233 _last_update_rs_processed_buffers.verify(); 234 _last_scan_rs_times_ms.verify(); 235 _last_strong_code_root_scan_times_ms.verify(); 236 _last_obj_copy_times_ms.verify(); 237 _last_termination_times_ms.verify(); 238 _last_termination_attempts.verify(); 239 _last_gc_worker_end_times_ms.verify(); 240 241 for (uint i = 0; i < _active_gc_threads; i++) { 242 double worker_time = _last_gc_worker_end_times_ms.get(i) - _last_gc_worker_start_times_ms.get(i); 243 _last_gc_worker_times_ms.set(i, worker_time); 244 245 double worker_known_time = _last_ext_root_scan_times_ms.get(i) + 246 _last_satb_filtering_times_ms.get(i) + 247 _last_update_rs_times_ms.get(i) + 248 _last_scan_rs_times_ms.get(i) + 249 _last_strong_code_root_scan_times_ms.get(i) + 250 _last_obj_copy_times_ms.get(i) + 251 _last_termination_times_ms.get(i); 252 253 double worker_other_time = worker_time - worker_known_time; 254 _last_gc_worker_other_times_ms.set(i, worker_other_time); 255 } 256 257 _last_gc_worker_times_ms.verify(); 258 _last_gc_worker_other_times_ms.verify(); 259 260 _last_redirty_logged_cards_time_ms.verify(); 261 _last_redirty_logged_cards_processed_cards.verify(); 262 } 263 264 void G1GCPhaseTimes::note_string_dedup_fixup_start() { 265 _cur_string_dedup_queue_fixup_worker_times_ms.reset(); 266 _cur_string_dedup_table_fixup_worker_times_ms.reset(); 267 } 268 269 void G1GCPhaseTimes::note_string_dedup_fixup_end() { 270 _cur_string_dedup_queue_fixup_worker_times_ms.verify(); 271 _cur_string_dedup_table_fixup_worker_times_ms.verify(); 272 } 273 274 void G1GCPhaseTimes::print_stats(int level, const char* str, double value) { 275 LineBuffer(level).append_and_print_cr("[%s: %.1lf ms]", str, value); 276 } 277 278 void G1GCPhaseTimes::print_stats(int level, const char* str, size_t value) { 279 LineBuffer(level).append_and_print_cr("[%s: "SIZE_FORMAT"]", str, value); 280 } 281 282 void G1GCPhaseTimes::print_stats(int level, const char* str, double value, uint workers) { 283 LineBuffer(level).append_and_print_cr("[%s: %.1lf ms, GC Workers: %u]", str, value, workers); 284 } 285 286 double G1GCPhaseTimes::accounted_time_ms() { 287 // Subtract the root region scanning wait time. It's initialized to 288 // zero at the start of the pause. 289 double misc_time_ms = _root_region_scan_wait_time_ms; 290 291 misc_time_ms += _cur_collection_par_time_ms; 292 293 // Now subtract the time taken to fix up roots in generated code 294 misc_time_ms += _cur_collection_code_root_fixup_time_ms; 295 296 // Strong code root purge time 297 misc_time_ms += _cur_strong_code_root_purge_time_ms; 298 299 if (G1StringDedup::is_enabled()) { 300 // String dedup fixup time 301 misc_time_ms += _cur_string_dedup_fixup_time_ms; 302 } 303 304 // Subtract the time taken to clean the card table from the 305 // current value of "other time" 306 misc_time_ms += _cur_clear_ct_time_ms; 307 308 return misc_time_ms; 309 } 310 311 void G1GCPhaseTimes::print(double pause_time_sec) { 312 if (_root_region_scan_wait_time_ms > 0.0) { 313 print_stats(1, "Root Region Scan Waiting", _root_region_scan_wait_time_ms); 314 } 315 print_stats(1, "Parallel Time", _cur_collection_par_time_ms, _active_gc_threads); 316 _last_gc_worker_start_times_ms.print(2, "GC Worker Start (ms)"); 317 _last_ext_root_scan_times_ms.print(2, "Ext Root Scanning (ms)"); 318 if (track_ext_root_scan_phases()) { 319 for (uint i = 0; i < _num_ext_root_scan_phases; i++) { 320 WorkerDataArray<double>* data = _last_ext_root_scan_phase_times_ms[i]; 321 data->print(3, G1CollectedHeap::ext_roots_task_string(i)); 322 } 323 } 324 if (_last_satb_filtering_times_ms.sum() > 0.0) { 325 _last_satb_filtering_times_ms.print(2, "SATB Filtering (ms)"); 326 } 327 _last_update_rs_times_ms.print(2, "Update RS (ms)"); 328 _last_update_rs_processed_buffers.print(3, "Processed Buffers"); 329 _last_scan_rs_times_ms.print(2, "Scan RS (ms)"); 330 _last_strong_code_root_scan_times_ms.print(2, "Code Root Scanning (ms)"); 331 _last_obj_copy_times_ms.print(2, "Object Copy (ms)"); 332 _last_termination_times_ms.print(2, "Termination (ms)"); 333 if (G1Log::finest()) { 334 _last_termination_attempts.print(3, "Termination Attempts"); 335 } 336 _last_gc_worker_other_times_ms.print(2, "GC Worker Other (ms)"); 337 _last_gc_worker_times_ms.print(2, "GC Worker Total (ms)"); 338 _last_gc_worker_end_times_ms.print(2, "GC Worker End (ms)"); 339 340 print_stats(1, "Code Root Fixup", _cur_collection_code_root_fixup_time_ms); 341 print_stats(1, "Code Root Purge", _cur_strong_code_root_purge_time_ms); 342 if (G1StringDedup::is_enabled()) { 343 print_stats(1, "String Dedup Fixup", _cur_string_dedup_fixup_time_ms, _active_gc_threads); 344 _cur_string_dedup_queue_fixup_worker_times_ms.print(2, "Queue Fixup (ms)"); 345 _cur_string_dedup_table_fixup_worker_times_ms.print(2, "Table Fixup (ms)"); 346 } 347 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); 348 double misc_time_ms = pause_time_sec * MILLIUNITS - accounted_time_ms(); 349 print_stats(1, "Other", misc_time_ms); 350 if (_cur_verify_before_time_ms > 0.0) { 351 print_stats(2, "Verify Before", _cur_verify_before_time_ms); 352 } 353 if (G1CollectedHeap::heap()->evacuation_failed()) { 354 double evac_fail_handling = _cur_evac_fail_recalc_used + _cur_evac_fail_remove_self_forwards + 355 _cur_evac_fail_restore_remsets; 356 print_stats(2, "Evacuation Failure", evac_fail_handling); 357 if (G1Log::finest()) { 358 print_stats(3, "Recalculate Used", _cur_evac_fail_recalc_used); 359 print_stats(3, "Remove Self Forwards", _cur_evac_fail_remove_self_forwards); 360 print_stats(3, "Restore RemSet", _cur_evac_fail_restore_remsets); 361 } 362 } 363 print_stats(2, "Choose CSet", 364 (_recorded_young_cset_choice_time_ms + 365 _recorded_non_young_cset_choice_time_ms)); 366 print_stats(2, "Ref Proc", _cur_ref_proc_time_ms); 367 print_stats(2, "Ref Enq", _cur_ref_enq_time_ms); 368 print_stats(2, "Redirty Cards", _recorded_redirty_logged_cards_time_ms); 369 if (G1Log::finest()) { 370 _last_redirty_logged_cards_time_ms.print(3, "Parallel Redirty"); 371 _last_redirty_logged_cards_processed_cards.print(3, "Redirtied Cards"); 372 } 373 if (G1EagerReclaimHumongousObjects) { 374 print_stats(2, "Humongous Register", _cur_fast_reclaim_humongous_register_time_ms); 375 if (G1Log::finest()) { 376 print_stats(3, "Humongous Total", _cur_fast_reclaim_humongous_total); 377 print_stats(3, "Humongous Candidate", _cur_fast_reclaim_humongous_candidates); 378 } 379 print_stats(2, "Humongous Reclaim", _cur_fast_reclaim_humongous_time_ms); 380 if (G1Log::finest()) { 381 print_stats(3, "Humongous Reclaimed", _cur_fast_reclaim_humongous_reclaimed); 382 } 383 } 384 print_stats(2, "Free CSet", 385 (_recorded_young_free_cset_time_ms + 386 _recorded_non_young_free_cset_time_ms)); 387 if (G1Log::finest()) { 388 print_stats(3, "Young Free CSet", _recorded_young_free_cset_time_ms); 389 print_stats(3, "Non-Young Free CSet", _recorded_non_young_free_cset_time_ms); 390 } 391 if (_cur_verify_after_time_ms > 0.0) { 392 print_stats(2, "Verify After", _cur_verify_after_time_ms); 393 } 394 }