1 /* 2 * Copyright (c) 2012, 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 31 // Helper class for avoiding interleaved logging 32 class LineBuffer: public StackObj { 33 34 private: 35 static const int BUFFER_LEN = 1024; 36 static const int INDENT_CHARS = 3; 37 char _buffer[BUFFER_LEN]; 38 int _indent_level; 39 int _cur; 40 41 void vappend(const char* format, va_list ap) { 42 int res = vsnprintf(&_buffer[_cur], BUFFER_LEN - _cur, format, ap); 43 if (res != -1) { 44 _cur += res; 45 } else { 46 DEBUG_ONLY(warning("buffer too small in LineBuffer");) 47 _buffer[BUFFER_LEN -1] = 0; 48 _cur = BUFFER_LEN; // vsnprintf above should not add to _buffer if we are called again 49 } 50 } 51 52 public: 53 explicit LineBuffer(int indent_level): _indent_level(indent_level), _cur(0) { 54 for (; (_cur < BUFFER_LEN && _cur < (_indent_level * INDENT_CHARS)); _cur++) { 55 _buffer[_cur] = ' '; 56 } 57 } 58 59 #ifndef PRODUCT 60 ~LineBuffer() { 61 assert(_cur == _indent_level * INDENT_CHARS, "pending data in buffer - append_and_print_cr() not called?"); 62 } 63 #endif 64 65 void append(const char* format, ...) { 66 va_list ap; 67 va_start(ap, format); 68 vappend(format, ap); 69 va_end(ap); 70 } 71 72 void append_and_print_cr(const char* format, ...) { 73 va_list ap; 74 va_start(ap, format); 75 vappend(format, ap); 76 va_end(ap); 77 gclog_or_tty->print_cr("%s", _buffer); 78 _cur = _indent_level * INDENT_CHARS; 79 } 80 }; 81 82 template <class T> 83 void WorkerDataArray<T>::print(int level, const char* title) { 84 if (_length == 1) { 85 // No need for min, max, average and sum for only one worker 86 LineBuffer buf(level); 87 buf.append("[%s: ", title); 88 buf.append(_print_format, _data[0]); 89 buf.append_and_print_cr("]"); 90 return; 91 } 92 93 T min = _data[0]; 94 T max = _data[0]; 95 T sum = 0; 96 97 LineBuffer buf(level); 98 buf.append("[%s:", title); 99 for (uint i = 0; i < _length; ++i) { 100 T val = _data[i]; 101 min = MIN2(val, min); 102 max = MAX2(val, max); 103 sum += val; 104 if (G1Log::finest()) { 105 buf.append(" "); 106 buf.append(_print_format, val); 107 } 108 } 109 110 if (G1Log::finest()) { 111 buf.append_and_print_cr(""); 112 } 113 114 double avg = (double)sum / (double)_length; 115 buf.append(" Min: "); 116 buf.append(_print_format, min); 117 buf.append(", Avg: "); 118 buf.append("%.1lf", avg); // Always print average as a double 119 buf.append(", Max: "); 120 buf.append(_print_format, max); 121 buf.append(", Diff: "); 122 buf.append(_print_format, max - min); 123 if (_print_sum) { 124 // for things like the start and end times the sum is not 125 // that relevant 126 buf.append(", Sum: "); 127 buf.append(_print_format, sum); 128 } 129 buf.append_and_print_cr("]"); 130 } 131 132 #ifndef PRODUCT 133 134 template <class T> 135 void WorkerDataArray<T>::reset() { 136 for (uint i = 0; i < _length; i++) { 137 _data[i] = (T)-1; 138 } 139 } 140 141 template <class T> 142 void WorkerDataArray<T>::verify() { 143 for (uint i = 0; i < _length; i++) { 144 assert(_data[i] >= (T)0, err_msg("Invalid data for worker %d", i)); 145 } 146 } 147 148 #endif 149 150 G1GCPhaseTimes::G1GCPhaseTimes(uint max_gc_threads) : 151 _max_gc_threads(max_gc_threads), 152 _min_clear_cc_time_ms(-1.0), 153 _max_clear_cc_time_ms(-1.0), 154 _cur_clear_cc_time_ms(0.0), 155 _cum_clear_cc_time_ms(0.0), 156 _num_cc_clears(0L), 157 _last_gc_worker_start_times_ms(_max_gc_threads, "%.1lf", false), 158 _last_ext_root_scan_times_ms(_max_gc_threads, "%.1lf"), 159 _last_satb_filtering_times_ms(_max_gc_threads, "%.1lf"), 160 _last_update_rs_times_ms(_max_gc_threads, "%.1lf"), 161 _last_update_rs_processed_buffers(_max_gc_threads, "%d"), 162 _last_scan_rs_times_ms(_max_gc_threads, "%.1lf"), 163 _last_obj_copy_times_ms(_max_gc_threads, "%.1lf"), 164 _last_termination_times_ms(_max_gc_threads, "%.1lf"), 165 _last_termination_attempts(_max_gc_threads, SIZE_FORMAT), 166 _last_gc_worker_end_times_ms(_max_gc_threads, "%.1lf", false), 167 _last_gc_worker_times_ms(_max_gc_threads, "%.1lf"), 168 _last_gc_worker_other_times_ms(_max_gc_threads, "%.1lf") 169 { 170 assert(max_gc_threads > 0, "Must have some GC threads"); 171 } 172 173 void G1GCPhaseTimes::note_gc_start(uint active_gc_threads) { 174 assert(active_gc_threads > 0, "The number of threads must be > 0"); 175 assert(active_gc_threads <= _max_gc_threads, "The number of active threads must be <= the max nubmer of threads"); 176 _active_gc_threads = active_gc_threads; 177 178 _last_gc_worker_start_times_ms.reset(); 179 _last_ext_root_scan_times_ms.reset(); 180 _last_satb_filtering_times_ms.reset(); 181 _last_update_rs_times_ms.reset(); 182 _last_update_rs_processed_buffers.reset(); 183 _last_scan_rs_times_ms.reset(); 184 _last_obj_copy_times_ms.reset(); 185 _last_termination_times_ms.reset(); 186 _last_termination_attempts.reset(); 187 _last_gc_worker_end_times_ms.reset(); 188 _last_gc_worker_times_ms.reset(); 189 _last_gc_worker_other_times_ms.reset(); 190 } 191 192 void G1GCPhaseTimes::note_gc_end() { 193 _last_gc_worker_start_times_ms.verify(); 194 _last_ext_root_scan_times_ms.verify(); 195 _last_satb_filtering_times_ms.verify(); 196 _last_update_rs_times_ms.verify(); 197 _last_update_rs_processed_buffers.verify(); 198 _last_scan_rs_times_ms.verify(); 199 _last_obj_copy_times_ms.verify(); 200 _last_termination_times_ms.verify(); 201 _last_termination_attempts.verify(); 202 _last_gc_worker_end_times_ms.verify(); 203 204 for (uint i = 0; i < _active_gc_threads; i++) { 205 double worker_time = _last_gc_worker_end_times_ms.get(i) - _last_gc_worker_start_times_ms.get(i); 206 _last_gc_worker_times_ms.set(i, worker_time); 207 208 double worker_known_time = _last_ext_root_scan_times_ms.get(i) + 209 _last_satb_filtering_times_ms.get(i) + 210 _last_update_rs_times_ms.get(i) + 211 _last_scan_rs_times_ms.get(i) + 212 _last_obj_copy_times_ms.get(i) + 213 _last_termination_times_ms.get(i); 214 215 double worker_other_time = worker_time - worker_known_time; 216 _last_gc_worker_other_times_ms.set(i, worker_other_time); 217 } 218 219 _last_gc_worker_times_ms.verify(); 220 _last_gc_worker_other_times_ms.verify(); 221 } 222 223 void G1GCPhaseTimes::print_stats(int level, const char* str, double value) { 224 LineBuffer(level).append_and_print_cr("[%s: %.1lf ms]", str, value); 225 } 226 227 void G1GCPhaseTimes::print_stats(int level, const char* str, double value, int workers) { 228 LineBuffer(level).append_and_print_cr("[%s: %.1lf ms, GC Workers: %d]", str, value, workers); 229 } 230 231 double G1GCPhaseTimes::accounted_time_ms() { 232 // Subtract the root region scanning wait time. It's initialized to 233 // zero at the start of the pause. 234 double misc_time_ms = _root_region_scan_wait_time_ms; 235 236 misc_time_ms += _cur_collection_par_time_ms; 237 238 // Now subtract the time taken to fix up roots in generated code 239 misc_time_ms += _cur_collection_code_root_fixup_time_ms; 240 241 // Subtract the time taken to clean the card table from the 242 // current value of "other time" 243 misc_time_ms += _cur_clear_ct_time_ms; 244 245 return misc_time_ms; 246 } 247 248 void G1GCPhaseTimes::print(double pause_time_sec) { 249 if (_root_region_scan_wait_time_ms > 0.0) { 250 print_stats(1, "Root Region Scan Waiting", _root_region_scan_wait_time_ms); 251 } 252 if (G1CollectedHeap::use_parallel_gc_threads()) { 253 print_stats(1, "Parallel Time", _cur_collection_par_time_ms, _active_gc_threads); 254 _last_gc_worker_start_times_ms.print(2, "GC Worker Start (ms)"); 255 _last_ext_root_scan_times_ms.print(2, "Ext Root Scanning (ms)"); 256 if (_last_satb_filtering_times_ms.sum() > 0.0) { 257 _last_satb_filtering_times_ms.print(2, "SATB Filtering (ms)"); 258 } 259 _last_update_rs_times_ms.print(2, "Update RS (ms)"); 260 _last_update_rs_processed_buffers.print(3, "Processed Buffers"); 261 _last_scan_rs_times_ms.print(2, "Scan RS (ms)"); 262 _last_obj_copy_times_ms.print(2, "Object Copy (ms)"); 263 _last_termination_times_ms.print(2, "Termination (ms)"); 264 if (G1Log::finest()) { 265 _last_termination_attempts.print(3, "Termination Attempts"); 266 } 267 _last_gc_worker_other_times_ms.print(2, "GC Worker Other (ms)"); 268 _last_gc_worker_times_ms.print(2, "GC Worker Total (ms)"); 269 _last_gc_worker_end_times_ms.print(2, "GC Worker End (ms)"); 270 } else { 271 _last_ext_root_scan_times_ms.print(1, "Ext Root Scanning (ms)"); 272 if (_last_satb_filtering_times_ms.sum() > 0.0) { 273 _last_satb_filtering_times_ms.print(1, "SATB Filtering (ms)"); 274 } 275 _last_update_rs_times_ms.print(1, "Update RS (ms)"); 276 _last_update_rs_processed_buffers.print(2, "Processed Buffers"); 277 _last_scan_rs_times_ms.print(1, "Scan RS (ms)"); 278 _last_obj_copy_times_ms.print(1, "Object Copy (ms)"); 279 } 280 print_stats(1, "Code Root Fixup", _cur_collection_code_root_fixup_time_ms); 281 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); 282 if (Verbose && G1Log::finest()) { 283 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); 284 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); 285 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); 286 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); 287 if (_num_cc_clears > 0) { 288 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); 289 } 290 } 291 double misc_time_ms = pause_time_sec * MILLIUNITS - accounted_time_ms(); 292 print_stats(1, "Other", misc_time_ms); 293 if (_cur_verify_before_time_ms > 0.0) { 294 print_stats(2, "Verify Before", _cur_verify_before_time_ms); 295 } 296 print_stats(2, "Choose CSet", 297 (_recorded_young_cset_choice_time_ms + 298 _recorded_non_young_cset_choice_time_ms)); 299 print_stats(2, "Ref Proc", _cur_ref_proc_time_ms); 300 print_stats(2, "Ref Enq", _cur_ref_enq_time_ms); 301 print_stats(2, "Free CSet", 302 (_recorded_young_free_cset_time_ms + 303 _recorded_non_young_free_cset_time_ms)); 304 if (_cur_verify_after_time_ms > 0.0) { 305 print_stats(2, "Verify After", _cur_verify_after_time_ms); 306 } 307 } 308 309 void G1GCPhaseTimes::record_cc_clear_time_ms(double ms) { 310 if (!(Verbose && G1Log::finest())) { 311 return; 312 } 313 314 if (_min_clear_cc_time_ms < 0.0 || ms <= _min_clear_cc_time_ms) { 315 _min_clear_cc_time_ms = ms; 316 } 317 if (_max_clear_cc_time_ms < 0.0 || ms >= _max_clear_cc_time_ms) { 318 _max_clear_cc_time_ms = ms; 319 } 320 _cur_clear_cc_time_ms = ms; 321 _cum_clear_cc_time_ms += ms; 322 _num_cc_clears++; 323 }