1 /* 2 * Copyright (c) 2003, 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 "classfile/systemDictionary.hpp" 27 #include "classfile/vmSymbols.hpp" 28 #include "gc/serial/defNewGeneration.hpp" 29 #include "gc/shared/space.hpp" 30 #include "memory/metaspace.hpp" 31 #include "oops/oop.inline.hpp" 32 #include "runtime/handles.inline.hpp" 33 #include "runtime/javaCalls.hpp" 34 #include "runtime/orderAccess.inline.hpp" 35 #include "services/lowMemoryDetector.hpp" 36 #include "services/management.hpp" 37 #include "services/memoryManager.hpp" 38 #include "services/memoryPool.hpp" 39 #include "utilities/globalDefinitions.hpp" 40 #include "utilities/macros.hpp" 41 42 MemoryPool::MemoryPool(const char* name, 43 PoolType type, 44 size_t init_size, 45 size_t max_size, 46 bool support_usage_threshold, 47 bool support_gc_threshold) { 48 _name = name; 49 _initial_size = init_size; 50 _max_size = max_size; 51 (void)const_cast<instanceOop&>(_memory_pool_obj = instanceOop(NULL)); 52 _available_for_allocation = true; 53 _num_managers = 0; 54 _type = type; 55 56 // initialize the max and init size of collection usage 57 _after_gc_usage = MemoryUsage(_initial_size, 0, 0, _max_size); 58 59 _usage_sensor = NULL; 60 _gc_usage_sensor = NULL; 61 // usage threshold supports both high and low threshold 62 _usage_threshold = new ThresholdSupport(support_usage_threshold, support_usage_threshold); 63 // gc usage threshold supports only high threshold 64 _gc_usage_threshold = new ThresholdSupport(support_gc_threshold, support_gc_threshold); 65 } 66 67 void MemoryPool::add_manager(MemoryManager* mgr) { 68 assert(_num_managers < MemoryPool::max_num_managers, "_num_managers exceeds the max"); 69 if (_num_managers < MemoryPool::max_num_managers) { 70 _managers[_num_managers] = mgr; 71 _num_managers++; 72 } 73 } 74 75 76 // Returns an instanceHandle of a MemoryPool object. 77 // It creates a MemoryPool instance when the first time 78 // this function is called. 79 instanceOop MemoryPool::get_memory_pool_instance(TRAPS) { 80 // Must do an acquire so as to force ordering of subsequent 81 // loads from anything _memory_pool_obj points to or implies. 82 instanceOop pool_obj = OrderAccess::load_acquire(&_memory_pool_obj); 83 if (pool_obj == NULL) { 84 // It's ok for more than one thread to execute the code up to the locked region. 85 // Extra pool instances will just be gc'ed. 86 InstanceKlass* ik = Management::sun_management_ManagementFactoryHelper_klass(CHECK_NULL); 87 88 Handle pool_name = java_lang_String::create_from_str(_name, CHECK_NULL); 89 jlong usage_threshold_value = (_usage_threshold->is_high_threshold_supported() ? 0 : -1L); 90 jlong gc_usage_threshold_value = (_gc_usage_threshold->is_high_threshold_supported() ? 0 : -1L); 91 92 JavaValue result(T_OBJECT); 93 JavaCallArguments args; 94 args.push_oop(pool_name); // Argument 1 95 args.push_int((int) is_heap()); // Argument 2 96 97 Symbol* method_name = vmSymbols::createMemoryPool_name(); 98 Symbol* signature = vmSymbols::createMemoryPool_signature(); 99 100 args.push_long(usage_threshold_value); // Argument 3 101 args.push_long(gc_usage_threshold_value); // Argument 4 102 103 JavaCalls::call_static(&result, 104 ik, 105 method_name, 106 signature, 107 &args, 108 CHECK_NULL); 109 110 instanceOop p = (instanceOop) result.get_jobject(); 111 instanceHandle pool(THREAD, p); 112 113 { 114 // Get lock since another thread may have create the instance 115 MutexLocker ml(Management_lock); 116 117 // Check if another thread has created the pool. We reload 118 // _memory_pool_obj here because some other thread may have 119 // initialized it while we were executing the code before the lock. 120 // 121 // The lock has done an acquire, so the load can't float above it, 122 // but we need to do a load_acquire as above. 123 pool_obj = OrderAccess::load_acquire(&_memory_pool_obj); 124 if (pool_obj != NULL) { 125 return pool_obj; 126 } 127 128 // Get the address of the object we created via call_special. 129 pool_obj = pool(); 130 131 // Use store barrier to make sure the memory accesses associated 132 // with creating the pool are visible before publishing its address. 133 // The unlock will publish the store to _memory_pool_obj because 134 // it does a release first. 135 OrderAccess::release_store(&_memory_pool_obj, pool_obj); 136 } 137 } 138 139 return pool_obj; 140 } 141 142 inline static size_t get_max_value(size_t val1, size_t val2) { 143 return (val1 > val2 ? val1 : val2); 144 } 145 146 void MemoryPool::record_peak_memory_usage() { 147 // Caller in JDK is responsible for synchronization - 148 // acquire the lock for this memory pool before calling VM 149 MemoryUsage usage = get_memory_usage(); 150 size_t peak_used = get_max_value(usage.used(), _peak_usage.used()); 151 size_t peak_committed = get_max_value(usage.committed(), _peak_usage.committed()); 152 size_t peak_max_size = get_max_value(usage.max_size(), _peak_usage.max_size()); 153 154 _peak_usage = MemoryUsage(initial_size(), peak_used, peak_committed, peak_max_size); 155 } 156 157 static void set_sensor_obj_at(SensorInfo** sensor_ptr, instanceHandle sh) { 158 assert(*sensor_ptr == NULL, "Should be called only once"); 159 SensorInfo* sensor = new SensorInfo(); 160 sensor->set_sensor(sh()); 161 *sensor_ptr = sensor; 162 } 163 164 void MemoryPool::set_usage_sensor_obj(instanceHandle sh) { 165 set_sensor_obj_at(&_usage_sensor, sh); 166 } 167 168 void MemoryPool::set_gc_usage_sensor_obj(instanceHandle sh) { 169 set_sensor_obj_at(&_gc_usage_sensor, sh); 170 } 171 172 void MemoryPool::oops_do(OopClosure* f) { 173 f->do_oop((oop*) &_memory_pool_obj); 174 if (_usage_sensor != NULL) { 175 _usage_sensor->oops_do(f); 176 } 177 if (_gc_usage_sensor != NULL) { 178 _gc_usage_sensor->oops_do(f); 179 } 180 } 181 182 ContiguousSpacePool::ContiguousSpacePool(ContiguousSpace* space, 183 const char* name, 184 PoolType type, 185 size_t max_size, 186 bool support_usage_threshold) : 187 CollectedMemoryPool(name, type, space->capacity(), max_size, 188 support_usage_threshold), _space(space) { 189 } 190 191 size_t ContiguousSpacePool::used_in_bytes() { 192 return space()->used(); 193 } 194 195 MemoryUsage ContiguousSpacePool::get_memory_usage() { 196 size_t maxSize = (available_for_allocation() ? max_size() : 0); 197 size_t used = used_in_bytes(); 198 size_t committed = _space->capacity(); 199 200 return MemoryUsage(initial_size(), used, committed, maxSize); 201 } 202 203 SurvivorContiguousSpacePool::SurvivorContiguousSpacePool(DefNewGeneration* young_gen, 204 const char* name, 205 PoolType type, 206 size_t max_size, 207 bool support_usage_threshold) : 208 CollectedMemoryPool(name, type, young_gen->from()->capacity(), max_size, 209 support_usage_threshold), _young_gen(young_gen) { 210 } 211 212 size_t SurvivorContiguousSpacePool::used_in_bytes() { 213 return _young_gen->from()->used(); 214 } 215 216 size_t SurvivorContiguousSpacePool::committed_in_bytes() { 217 return _young_gen->from()->capacity(); 218 } 219 220 MemoryUsage SurvivorContiguousSpacePool::get_memory_usage() { 221 size_t maxSize = (available_for_allocation() ? max_size() : 0); 222 size_t used = used_in_bytes(); 223 size_t committed = committed_in_bytes(); 224 225 return MemoryUsage(initial_size(), used, committed, maxSize); 226 } 227 228 GenerationPool::GenerationPool(Generation* gen, 229 const char* name, 230 PoolType type, 231 bool support_usage_threshold) : 232 CollectedMemoryPool(name, type, gen->capacity(), gen->max_capacity(), 233 support_usage_threshold), _gen(gen) { 234 } 235 236 size_t GenerationPool::used_in_bytes() { 237 return _gen->used(); 238 } 239 240 MemoryUsage GenerationPool::get_memory_usage() { 241 size_t used = used_in_bytes(); 242 size_t committed = _gen->capacity(); 243 size_t maxSize = (available_for_allocation() ? max_size() : 0); 244 245 return MemoryUsage(initial_size(), used, committed, maxSize); 246 } 247 248 CodeHeapPool::CodeHeapPool(CodeHeap* codeHeap, const char* name, bool support_usage_threshold) : 249 MemoryPool(name, NonHeap, codeHeap->capacity(), codeHeap->max_capacity(), 250 support_usage_threshold, false), _codeHeap(codeHeap) { 251 } 252 253 MemoryUsage CodeHeapPool::get_memory_usage() { 254 size_t used = used_in_bytes(); 255 size_t committed = _codeHeap->capacity(); 256 size_t maxSize = (available_for_allocation() ? max_size() : 0); 257 258 return MemoryUsage(initial_size(), used, committed, maxSize); 259 } 260 261 MetaspacePool::MetaspacePool() : 262 MemoryPool("Metaspace", NonHeap, 0, calculate_max_size(), true, false) { } 263 264 MemoryUsage MetaspacePool::get_memory_usage() { 265 size_t committed = MetaspaceAux::committed_bytes(); 266 return MemoryUsage(initial_size(), used_in_bytes(), committed, max_size()); 267 } 268 269 size_t MetaspacePool::used_in_bytes() { 270 return MetaspaceAux::used_bytes(); 271 } 272 273 size_t MetaspacePool::calculate_max_size() const { 274 return FLAG_IS_CMDLINE(MaxMetaspaceSize) ? MaxMetaspaceSize : 275 MemoryUsage::undefined_size(); 276 } 277 278 CompressedKlassSpacePool::CompressedKlassSpacePool() : 279 MemoryPool("Compressed Class Space", NonHeap, 0, CompressedClassSpaceSize, true, false) { } 280 281 size_t CompressedKlassSpacePool::used_in_bytes() { 282 return MetaspaceAux::used_bytes(Metaspace::ClassType); 283 } 284 285 MemoryUsage CompressedKlassSpacePool::get_memory_usage() { 286 size_t committed = MetaspaceAux::committed_bytes(Metaspace::ClassType); 287 return MemoryUsage(initial_size(), used_in_bytes(), committed, max_size()); 288 }