1 /* 2 * Copyright (c) 2003, 2014, 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 "memory/metaspace.hpp" 29 #include "oops/oop.inline.hpp" 30 #include "runtime/handles.inline.hpp" 31 #include "runtime/javaCalls.hpp" 32 #include "runtime/orderAccess.inline.hpp" 33 #include "services/lowMemoryDetector.hpp" 34 #include "services/management.hpp" 35 #include "services/memoryManager.hpp" 36 #include "services/memoryPool.hpp" 37 #include "utilities/macros.hpp" 38 #include "utilities/globalDefinitions.hpp" 39 40 MemoryPool::MemoryPool(const char* name, 41 PoolType type, 42 size_t init_size, 43 size_t max_size, 44 bool support_usage_threshold, 45 bool support_gc_threshold) { 46 _name = name; 47 _initial_size = init_size; 48 _max_size = max_size; 49 (void)const_cast<instanceOop&>(_memory_pool_obj = instanceOop(NULL)); 50 _available_for_allocation = true; 51 _num_managers = 0; 52 _type = type; 53 54 // initialize the max and init size of collection usage 55 _after_gc_usage = MemoryUsage(_initial_size, 0, 0, _max_size); 56 57 _usage_sensor = NULL; 58 _gc_usage_sensor = NULL; 59 // usage threshold supports both high and low threshold 60 _usage_threshold = new ThresholdSupport(support_usage_threshold, support_usage_threshold); 61 // gc usage threshold supports only high threshold 62 _gc_usage_threshold = new ThresholdSupport(support_gc_threshold, support_gc_threshold); 63 } 64 65 void MemoryPool::add_manager(MemoryManager* mgr) { 66 assert(_num_managers < MemoryPool::max_num_managers, "_num_managers exceeds the max"); 67 if (_num_managers < MemoryPool::max_num_managers) { 68 _managers[_num_managers] = mgr; 69 _num_managers++; 70 } 71 } 72 73 74 // Returns an instanceHandle of a MemoryPool object. 75 // It creates a MemoryPool instance when the first time 76 // this function is called. 77 instanceOop MemoryPool::get_memory_pool_instance(TRAPS) { 78 // Must do an acquire so as to force ordering of subsequent 79 // loads from anything _memory_pool_obj points to or implies. 80 instanceOop pool_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_pool_obj); 81 if (pool_obj == NULL) { 82 // It's ok for more than one thread to execute the code up to the locked region. 83 // Extra pool instances will just be gc'ed. 84 Klass* k = Management::sun_management_ManagementFactory_klass(CHECK_NULL); 85 instanceKlassHandle ik(THREAD, k); 86 87 Handle pool_name = java_lang_String::create_from_str(_name, CHECK_NULL); 88 jlong usage_threshold_value = (_usage_threshold->is_high_threshold_supported() ? 0 : -1L); 89 jlong gc_usage_threshold_value = (_gc_usage_threshold->is_high_threshold_supported() ? 0 : -1L); 90 91 JavaValue result(T_OBJECT); 92 JavaCallArguments args; 93 args.push_oop(pool_name); // Argument 1 94 args.push_int((int) is_heap()); // Argument 2 95 96 Symbol* method_name = vmSymbols::createMemoryPool_name(); 97 Symbol* signature = vmSymbols::createMemoryPool_signature(); 98 99 args.push_long(usage_threshold_value); // Argument 3 100 args.push_long(gc_usage_threshold_value); // Argument 4 101 102 JavaCalls::call_static(&result, 103 ik, 104 method_name, 105 signature, 106 &args, 107 CHECK_NULL); 108 109 instanceOop p = (instanceOop) result.get_jobject(); 110 instanceHandle pool(THREAD, p); 111 112 { 113 // Get lock since another thread may have create the instance 114 MutexLocker ml(Management_lock); 115 116 // Check if another thread has created the pool. We reload 117 // _memory_pool_obj here because some other thread may have 118 // initialized it while we were executing the code before the lock. 119 // 120 // The lock has done an acquire, so the load can't float above it, 121 // but we need to do a load_acquire as above. 122 pool_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_pool_obj); 123 if (pool_obj != NULL) { 124 return pool_obj; 125 } 126 127 // Get the address of the object we created via call_special. 128 pool_obj = pool(); 129 130 // Use store barrier to make sure the memory accesses associated 131 // with creating the pool are visible before publishing its address. 132 // The unlock will publish the store to _memory_pool_obj because 133 // it does a release first. 134 OrderAccess::release_store_ptr(&_memory_pool_obj, pool_obj); 135 } 136 } 137 138 return pool_obj; 139 } 140 141 inline static size_t get_max_value(size_t val1, size_t val2) { 142 return (val1 > val2 ? val1 : val2); 143 } 144 145 void MemoryPool::record_peak_memory_usage() { 146 // Caller in JDK is responsible for synchronization - 147 // acquire the lock for this memory pool before calling VM 148 MemoryUsage usage = get_memory_usage(); 149 size_t peak_used = get_max_value(usage.used(), _peak_usage.used()); 150 size_t peak_committed = get_max_value(usage.committed(), _peak_usage.committed()); 151 size_t peak_max_size = get_max_value(usage.max_size(), _peak_usage.max_size()); 152 153 _peak_usage = MemoryUsage(initial_size(), peak_used, peak_committed, peak_max_size); 154 } 155 156 static void set_sensor_obj_at(SensorInfo** sensor_ptr, instanceHandle sh) { 157 assert(*sensor_ptr == NULL, "Should be called only once"); 158 SensorInfo* sensor = new SensorInfo(); 159 sensor->set_sensor(sh()); 160 *sensor_ptr = sensor; 161 } 162 163 void MemoryPool::set_usage_sensor_obj(instanceHandle sh) { 164 set_sensor_obj_at(&_usage_sensor, sh); 165 } 166 167 void MemoryPool::set_gc_usage_sensor_obj(instanceHandle sh) { 168 set_sensor_obj_at(&_gc_usage_sensor, sh); 169 } 170 171 void MemoryPool::oops_do(OopClosure* f) { 172 f->do_oop((oop*) &_memory_pool_obj); 173 if (_usage_sensor != NULL) { 174 _usage_sensor->oops_do(f); 175 } 176 if (_gc_usage_sensor != NULL) { 177 _gc_usage_sensor->oops_do(f); 178 } 179 } 180 181 ContiguousSpacePool::ContiguousSpacePool(ContiguousSpace* space, 182 const char* name, 183 PoolType type, 184 size_t max_size, 185 bool support_usage_threshold) : 186 CollectedMemoryPool(name, type, space->capacity(), max_size, 187 support_usage_threshold), _space(space) { 188 } 189 190 MemoryUsage ContiguousSpacePool::get_memory_usage() { 191 size_t maxSize = (available_for_allocation() ? max_size() : 0); 192 size_t used = used_in_bytes(); 193 size_t committed = _space->capacity(); 194 195 return MemoryUsage(initial_size(), used, committed, maxSize); 196 } 197 198 SurvivorContiguousSpacePool::SurvivorContiguousSpacePool(DefNewGeneration* gen, 199 const char* name, 200 PoolType type, 201 size_t max_size, 202 bool support_usage_threshold) : 203 CollectedMemoryPool(name, type, gen->from()->capacity(), max_size, 204 support_usage_threshold), _gen(gen) { 205 } 206 207 MemoryUsage SurvivorContiguousSpacePool::get_memory_usage() { 208 size_t maxSize = (available_for_allocation() ? max_size() : 0); 209 size_t used = used_in_bytes(); 210 size_t committed = committed_in_bytes(); 211 212 return MemoryUsage(initial_size(), used, committed, maxSize); 213 } 214 215 #if INCLUDE_ALL_GCS 216 CompactibleFreeListSpacePool::CompactibleFreeListSpacePool(CompactibleFreeListSpace* space, 217 const char* name, 218 PoolType type, 219 size_t max_size, 220 bool support_usage_threshold) : 221 CollectedMemoryPool(name, type, space->capacity(), max_size, 222 support_usage_threshold), _space(space) { 223 } 224 225 MemoryUsage CompactibleFreeListSpacePool::get_memory_usage() { 226 size_t maxSize = (available_for_allocation() ? max_size() : 0); 227 size_t used = used_in_bytes(); 228 size_t committed = _space->capacity(); 229 230 return MemoryUsage(initial_size(), used, committed, maxSize); 231 } 232 #endif // INCLUDE_ALL_GCS 233 234 GenerationPool::GenerationPool(Generation* gen, 235 const char* name, 236 PoolType type, 237 bool support_usage_threshold) : 238 CollectedMemoryPool(name, type, gen->capacity(), gen->max_capacity(), 239 support_usage_threshold), _gen(gen) { 240 } 241 242 MemoryUsage GenerationPool::get_memory_usage() { 243 size_t used = used_in_bytes(); 244 size_t committed = _gen->capacity(); 245 size_t maxSize = (available_for_allocation() ? max_size() : 0); 246 247 return MemoryUsage(initial_size(), used, committed, maxSize); 248 } 249 250 CodeHeapPool::CodeHeapPool(CodeHeap* codeHeap, const char* name, bool support_usage_threshold) : 251 MemoryPool(name, NonHeap, codeHeap->capacity(), codeHeap->max_capacity(), 252 support_usage_threshold, false), _codeHeap(codeHeap) { 253 } 254 255 MemoryUsage CodeHeapPool::get_memory_usage() { 256 size_t used = used_in_bytes(); 257 size_t committed = _codeHeap->capacity(); 258 size_t maxSize = (available_for_allocation() ? max_size() : 0); 259 260 return MemoryUsage(initial_size(), used, committed, maxSize); 261 } 262 263 MetaspacePool::MetaspacePool() : 264 MemoryPool("Metaspace", NonHeap, 0, calculate_max_size(), true, false) { } 265 266 MemoryUsage MetaspacePool::get_memory_usage() { 267 size_t committed = MetaspaceAux::committed_bytes(); 268 return MemoryUsage(initial_size(), used_in_bytes(), committed, max_size()); 269 } 270 271 size_t MetaspacePool::used_in_bytes() { 272 return MetaspaceAux::used_bytes(); 273 } 274 275 size_t MetaspacePool::calculate_max_size() const { 276 return FLAG_IS_CMDLINE(MaxMetaspaceSize) ? MaxMetaspaceSize : 277 MemoryUsage::undefined_size(); 278 } 279 280 CompressedKlassSpacePool::CompressedKlassSpacePool() : 281 MemoryPool("Compressed Class Space", NonHeap, 0, CompressedClassSpaceSize, true, false) { } 282 283 size_t CompressedKlassSpacePool::used_in_bytes() { 284 return MetaspaceAux::used_bytes(Metaspace::ClassType); 285 } 286 287 MemoryUsage CompressedKlassSpacePool::get_memory_usage() { 288 size_t committed = MetaspaceAux::committed_bytes(Metaspace::ClassType); 289 return MemoryUsage(initial_size(), used_in_bytes(), committed, max_size()); 290 }