1 /* 2 * Copyright (c) 2011, 2019, 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/g1MonitoringSupport.hpp" 28 #include "gc/g1/g1Policy.hpp" 29 #include "gc/g1/g1MemoryPool.hpp" 30 #include "gc/shared/hSpaceCounters.hpp" 31 #include "memory/metaspaceCounters.hpp" 32 #include "services/memoryPool.hpp" 33 34 class G1GenerationCounters : public GenerationCounters { 35 protected: 36 G1MonitoringSupport* _g1mm; 37 38 public: 39 G1GenerationCounters(G1MonitoringSupport* g1mm, 40 const char* name, int ordinal, int spaces, 41 size_t min_capacity, size_t max_capacity, 42 size_t curr_capacity) 43 : GenerationCounters(name, ordinal, spaces, min_capacity, 44 max_capacity, curr_capacity), _g1mm(g1mm) { } 45 }; 46 47 class G1YoungGenerationCounters : public G1GenerationCounters { 48 public: 49 // We pad the capacity three times given that the young generation 50 // contains three spaces (eden and two survivors). 51 G1YoungGenerationCounters(G1MonitoringSupport* g1mm, const char* name, size_t max_size) 52 : G1GenerationCounters(g1mm, name, 0 /* ordinal */, 3 /* spaces */, 53 G1MonitoringSupport::pad_capacity(0, 3) /* min_capacity */, 54 G1MonitoringSupport::pad_capacity(max_size, 3), 55 G1MonitoringSupport::pad_capacity(0, 3) /* curr_capacity */) { 56 if (UsePerfData) { 57 update_all(); 58 } 59 } 60 61 virtual void update_all() { 62 size_t committed = 63 G1MonitoringSupport::pad_capacity(_g1mm->young_gen_committed(), 3); 64 _current_size->set_value(committed); 65 } 66 }; 67 68 class G1OldGenerationCounters : public G1GenerationCounters { 69 public: 70 G1OldGenerationCounters(G1MonitoringSupport* g1mm, const char* name, size_t max_size) 71 : G1GenerationCounters(g1mm, name, 1 /* ordinal */, 1 /* spaces */, 72 G1MonitoringSupport::pad_capacity(0) /* min_capacity */, 73 G1MonitoringSupport::pad_capacity(max_size), 74 G1MonitoringSupport::pad_capacity(0) /* curr_capacity */) { 75 if (UsePerfData) { 76 update_all(); 77 } 78 } 79 80 virtual void update_all() { 81 size_t committed = 82 G1MonitoringSupport::pad_capacity(_g1mm->old_gen_committed()); 83 _current_size->set_value(committed); 84 } 85 }; 86 87 G1MonitoringSupport::G1MonitoringSupport(G1CollectedHeap* g1h) : 88 _g1h(g1h), 89 _incremental_memory_manager("G1 Young Generation", "end of minor GC"), 90 _full_gc_memory_manager("G1 Old Generation", "end of major GC"), 91 _eden_space_pool(NULL), 92 _survivor_space_pool(NULL), 93 _old_gen_pool(NULL), 94 _incremental_collection_counters(NULL), 95 _full_collection_counters(NULL), 96 _conc_collection_counters(NULL), 97 _young_gen_counters(NULL), 98 _old_gen_counters(NULL), 99 _old_space_counters(NULL), 100 _eden_space_counters(NULL), 101 _from_space_counters(NULL), 102 _to_space_counters(NULL), 103 104 _overall_committed(0), 105 _overall_used(0), 106 _young_gen_committed(0), 107 _old_gen_committed(0), 108 109 _eden_space_committed(0), 110 _eden_space_used(0), 111 _survivor_space_committed(0), 112 _survivor_space_used(0), 113 _old_gen_used(0) { 114 115 recalculate_sizes(); 116 117 // Counters for garbage collections 118 // 119 // name "collector.0". In a generational collector this would be the 120 // young generation collection. 121 _incremental_collection_counters = 122 new CollectorCounters("G1 young collection pauses", 0); 123 // name "collector.1". In a generational collector this would be the 124 // old generation collection. 125 _full_collection_counters = 126 new CollectorCounters("G1 full collection pauses", 1); 127 // name "collector.2". In a generational collector this would be the 128 // STW phases in concurrent collection. 129 _conc_collection_counters = 130 new CollectorCounters("G1 concurrent cycle pauses", 2); 131 132 // "Generation" and "Space" counters. 133 // 134 // name "generation.1" This is logically the old generation in 135 // generational GC terms. The "1, 1" parameters are for 136 // the n-th generation (=1) with 1 space. 137 // Counters are created from minCapacity, maxCapacity, and capacity 138 _old_gen_counters = new G1OldGenerationCounters(this, "old", _g1h->max_capacity()); 139 140 // name "generation.1.space.0" 141 // Counters are created from maxCapacity, capacity, initCapacity, 142 // and used. 143 _old_space_counters = new HSpaceCounters(_old_gen_counters->name_space(), 144 "space", 0 /* ordinal */, 145 pad_capacity(g1h->max_capacity()) /* max_capacity */, 146 pad_capacity(_old_gen_committed) /* init_capacity */); 147 148 // Young collection set 149 // name "generation.0". This is logically the young generation. 150 // The "0, 3" are parameters for the n-th generation (=0) with 3 spaces. 151 // See _old_collection_counters for additional counters 152 _young_gen_counters = new G1YoungGenerationCounters(this, "young", _g1h->max_capacity()); 153 154 const char* young_collection_name_space = _young_gen_counters->name_space(); 155 156 // name "generation.0.space.0" 157 // See _old_space_counters for additional counters 158 _eden_space_counters = new HSpaceCounters(young_collection_name_space, 159 "eden", 0 /* ordinal */, 160 pad_capacity(g1h->max_capacity()) /* max_capacity */, 161 pad_capacity(_eden_space_committed) /* init_capacity */); 162 163 // name "generation.0.space.1" 164 // See _old_space_counters for additional counters 165 // Set the arguments to indicate that this survivor space is not used. 166 _from_space_counters = new HSpaceCounters(young_collection_name_space, 167 "s0", 1 /* ordinal */, 168 pad_capacity(0) /* max_capacity */, 169 pad_capacity(0) /* init_capacity */); 170 // Given that this survivor space is not used, we update it here 171 // once to reflect that its used space is 0 so that we don't have to 172 // worry about updating it again later. 173 if (UsePerfData) { 174 _from_space_counters->update_used(0); 175 } 176 177 // name "generation.0.space.2" 178 // See _old_space_counters for additional counters 179 _to_space_counters = new HSpaceCounters(young_collection_name_space, 180 "s1", 2 /* ordinal */, 181 pad_capacity(g1h->max_capacity()) /* max_capacity */, 182 pad_capacity(_survivor_space_committed) /* init_capacity */); 183 } 184 185 G1MonitoringSupport::~G1MonitoringSupport() { 186 delete _eden_space_pool; 187 delete _survivor_space_pool; 188 delete _old_gen_pool; 189 } 190 191 void G1MonitoringSupport::initialize_serviceability() { 192 _eden_space_pool = new G1EdenPool(_g1h, _eden_space_committed); 193 _survivor_space_pool = new G1SurvivorPool(_g1h, _survivor_space_committed); 194 _old_gen_pool = new G1OldGenPool(_g1h, _old_gen_committed, _g1h->max_capacity()); 195 196 _full_gc_memory_manager.add_pool(_eden_space_pool); 197 _full_gc_memory_manager.add_pool(_survivor_space_pool); 198 _full_gc_memory_manager.add_pool(_old_gen_pool); 199 200 _incremental_memory_manager.add_pool(_eden_space_pool); 201 _incremental_memory_manager.add_pool(_survivor_space_pool); 202 _incremental_memory_manager.add_pool(_old_gen_pool, false /* always_affected_by_gc */); 203 } 204 205 MemoryUsage G1MonitoringSupport::memory_usage() { 206 MutexLocker x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag); 207 return MemoryUsage(InitialHeapSize, _overall_used, _overall_committed, _g1h->max_capacity()); 208 } 209 210 GrowableArray<GCMemoryManager*> G1MonitoringSupport::memory_managers() { 211 GrowableArray<GCMemoryManager*> memory_managers(2); 212 memory_managers.append(&_incremental_memory_manager); 213 memory_managers.append(&_full_gc_memory_manager); 214 return memory_managers; 215 } 216 217 GrowableArray<MemoryPool*> G1MonitoringSupport::memory_pools() { 218 GrowableArray<MemoryPool*> memory_pools(3); 219 memory_pools.append(_eden_space_pool); 220 memory_pools.append(_survivor_space_pool); 221 memory_pools.append(_old_gen_pool); 222 return memory_pools; 223 } 224 225 void G1MonitoringSupport::recalculate_sizes() { 226 assert_heap_locked_or_at_safepoint(true); 227 228 MutexLocker x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag); 229 // Recalculate all the sizes from scratch. 230 231 // This never includes used bytes of current allocating heap region. 232 _overall_used = _g1h->used_unlocked(); 233 _eden_space_used = _g1h->eden_regions_used_bytes(); 234 _survivor_space_used = _g1h->survivor_regions_used_bytes(); 235 236 // _overall_used and _eden_space_used are obtained concurrently so 237 // may be inconsistent with each other. To prevent _old_gen_used going negative, 238 // use smaller value to substract. 239 _old_gen_used = _overall_used - MIN2(_overall_used, _eden_space_used + _survivor_space_used); 240 241 uint survivor_list_length = _g1h->survivor_regions_count(); 242 // Max length includes any potential extensions to the young gen 243 // we'll do when the GC locker is active. 244 uint young_list_max_length = _g1h->policy()->young_list_max_length(); 245 assert(young_list_max_length >= survivor_list_length, "Max young gen (%u) should be " 246 "larger than or equal to survivor count (%u)", 247 young_list_max_length, survivor_list_length); 248 uint eden_list_max_length = young_list_max_length - survivor_list_length; 249 250 // First calculate the committed sizes that can be calculated independently. 251 _survivor_space_committed = survivor_list_length * HeapRegion::GrainBytes; 252 _old_gen_committed = HeapRegion::align_up_to_region_byte_size(_old_gen_used); 253 254 // Next, start with the overall committed size. 255 _overall_committed = _g1h->capacity(); 256 size_t committed = _overall_committed; 257 258 // Remove the committed size we have calculated so far (for the 259 // survivor and old space). 260 assert(committed >= (_survivor_space_committed + _old_gen_committed), 261 "Committed (" SIZE_FORMAT ") should be larger than or equal to sum (" SIZE_FORMAT 262 ") of survivor committed (" SIZE_FORMAT ") and old gen committed (" SIZE_FORMAT ")", 263 committed, _survivor_space_committed + _old_gen_committed, 264 _survivor_space_committed, _old_gen_committed); 265 committed -= _survivor_space_committed + _old_gen_committed; 266 267 // Next, calculate and remove the committed size for the eden. 268 _eden_space_committed = (size_t) eden_list_max_length * HeapRegion::GrainBytes; 269 // Somewhat defensive: be robust in case there are inaccuracies in 270 // the calculations 271 _eden_space_committed = MIN2(_eden_space_committed, committed); 272 committed -= _eden_space_committed; 273 274 // Finally, give the rest to the old space... 275 _old_gen_committed += committed; 276 // ..and calculate the young gen committed. 277 _young_gen_committed = _eden_space_committed + _survivor_space_committed; 278 279 assert(_overall_committed == 280 (_eden_space_committed + _survivor_space_committed + _old_gen_committed), 281 "the committed sizes should add up"); 282 // Somewhat defensive: cap the eden used size to make sure it 283 // never exceeds the committed size. 284 _eden_space_used = MIN2(_eden_space_used, _eden_space_committed); 285 // _survivor_space_used is calculated during a safepoint and _survivor_space_committed 286 // is calculated from survivor region count * heap region size. 287 assert(_survivor_space_used <= _survivor_space_committed, "Survivor used bytes(" SIZE_FORMAT 288 ") should be less than or equal to survivor committed(" SIZE_FORMAT ")", 289 _survivor_space_used, _survivor_space_committed); 290 // _old_gen_committed is calculated in terms of _old_gen_used value. 291 assert(_old_gen_used <= _old_gen_committed, "Old gen used bytes(" SIZE_FORMAT 292 ") should be less than or equal to old gen committed(" SIZE_FORMAT ")", 293 _old_gen_used, _old_gen_committed); 294 } 295 296 void G1MonitoringSupport::update_sizes() { 297 recalculate_sizes(); 298 if (UsePerfData) { 299 _eden_space_counters->update_capacity(pad_capacity(_eden_space_committed)); 300 _eden_space_counters->update_used(_eden_space_used); 301 // only the "to" survivor space is active, so we don't need to 302 // update the counters for the "from" survivor space 303 _to_space_counters->update_capacity(pad_capacity(_survivor_space_committed)); 304 _to_space_counters->update_used(_survivor_space_used); 305 _old_space_counters->update_capacity(pad_capacity(_old_gen_committed)); 306 _old_space_counters->update_used(_old_gen_used); 307 308 _young_gen_counters->update_all(); 309 _old_gen_counters->update_all(); 310 311 MetaspaceCounters::update_performance_counters(); 312 CompressedClassSpaceCounters::update_performance_counters(); 313 } 314 } 315 316 void G1MonitoringSupport::update_eden_size() { 317 // Recalculate everything - this should be fast enough and we are sure that we do not 318 // miss anything. 319 recalculate_sizes(); 320 if (UsePerfData) { 321 _eden_space_counters->update_used(_eden_space_used); 322 } 323 } 324 325 MemoryUsage G1MonitoringSupport::eden_space_memory_usage(size_t initial_size, size_t max_size) { 326 MutexLocker x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag); 327 328 return MemoryUsage(initial_size, 329 _eden_space_used, 330 _eden_space_committed, 331 max_size); 332 } 333 334 MemoryUsage G1MonitoringSupport::survivor_space_memory_usage(size_t initial_size, size_t max_size) { 335 MutexLocker x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag); 336 337 return MemoryUsage(initial_size, 338 _survivor_space_used, 339 _survivor_space_committed, 340 max_size); 341 } 342 343 MemoryUsage G1MonitoringSupport::old_gen_memory_usage(size_t initial_size, size_t max_size) { 344 MutexLocker x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag); 345 346 return MemoryUsage(initial_size, 347 _old_gen_used, 348 _old_gen_committed, 349 max_size); 350 } 351 352 G1MonitoringScope::G1MonitoringScope(G1MonitoringSupport* g1mm, bool full_gc, bool all_memory_pools_affected) : 353 _tcs(full_gc ? g1mm->_full_collection_counters : g1mm->_incremental_collection_counters), 354 _tms(full_gc ? &g1mm->_full_gc_memory_manager : &g1mm->_incremental_memory_manager, 355 G1CollectedHeap::heap()->gc_cause(), all_memory_pools_affected) { 356 }