1 /* 2 * Copyright (c) 2003, 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 #include "precompiled.hpp" 26 #include "classfile/systemDictionary.hpp" 27 #include "classfile/vmSymbols.hpp" 28 #include "oops/oop.inline.hpp" 29 #include "runtime/handles.inline.hpp" 30 #include "runtime/javaCalls.hpp" 31 #include "services/lowMemoryDetector.hpp" 32 #include "services/management.hpp" 33 #include "services/memoryManager.hpp" 34 #include "services/memoryPool.hpp" 35 #include "utilities/macros.hpp" 36 37 MemoryPool::MemoryPool(const char* name, 38 PoolType type, 39 size_t init_size, 40 size_t max_size, 41 bool support_usage_threshold, 42 bool support_gc_threshold) { 43 _name = name; 44 _initial_size = init_size; 45 _max_size = max_size; 46 _memory_pool_obj = NULL; 47 _available_for_allocation = true; 48 _num_managers = 0; 49 _type = type; 50 51 // initialize the max and init size of collection usage 52 _after_gc_usage = MemoryUsage(_initial_size, 0, 0, _max_size); 53 54 _usage_sensor = NULL; 55 _gc_usage_sensor = NULL; 56 // usage threshold supports both high and low threshold 57 _usage_threshold = new ThresholdSupport(support_usage_threshold, support_usage_threshold); 58 // gc usage threshold supports only high threshold 59 _gc_usage_threshold = new ThresholdSupport(support_gc_threshold, support_gc_threshold); 60 } 61 62 void MemoryPool::add_manager(MemoryManager* mgr) { 63 assert(_num_managers < MemoryPool::max_num_managers, "_num_managers exceeds the max"); 64 if (_num_managers < MemoryPool::max_num_managers) { 65 _managers[_num_managers] = mgr; 66 _num_managers++; 67 } 68 } 69 70 71 // Returns an instanceHandle of a MemoryPool object. 72 // It creates a MemoryPool instance when the first time 73 // this function is called. 74 instanceOop MemoryPool::get_memory_pool_instance(TRAPS) { 75 // Must do an acquire so as to force ordering of subsequent 76 // loads from anything _memory_pool_obj points to or implies. 77 instanceOop pool_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_pool_obj); 78 if (pool_obj == NULL) { 79 // It's ok for more than one thread to execute the code up to the locked region. 80 // Extra pool instances will just be gc'ed. 81 Klass* k = Management::sun_management_ManagementFactory_klass(CHECK_NULL); 82 instanceKlassHandle ik(THREAD, k); 83 84 Handle pool_name = java_lang_String::create_from_str(_name, CHECK_NULL); 85 jlong usage_threshold_value = (_usage_threshold->is_high_threshold_supported() ? 0 : -1L); 86 jlong gc_usage_threshold_value = (_gc_usage_threshold->is_high_threshold_supported() ? 0 : -1L); 87 88 JavaValue result(T_OBJECT); 89 JavaCallArguments args; 90 args.push_oop(pool_name); // Argument 1 91 args.push_int((int) is_heap()); // Argument 2 92 93 Symbol* method_name = vmSymbols::createMemoryPool_name(); 94 Symbol* signature = vmSymbols::createMemoryPool_signature(); 95 96 args.push_long(usage_threshold_value); // Argument 3 97 args.push_long(gc_usage_threshold_value); // Argument 4 98 99 JavaCalls::call_static(&result, 100 ik, 101 method_name, 102 signature, 103 &args, 104 CHECK_NULL); 105 106 instanceOop p = (instanceOop) result.get_jobject(); 107 instanceHandle pool(THREAD, p); 108 109 { 110 // Get lock since another thread may have create the instance 111 MutexLocker ml(Management_lock); 112 113 // Check if another thread has created the pool. We reload 114 // _memory_pool_obj here because some other thread may have 115 // initialized it while we were executing the code before the lock. 116 // 117 // The lock has done an acquire, so the load can't float above it, 118 // but we need to do a load_acquire as above. 119 pool_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_pool_obj); 120 if (pool_obj != NULL) { 121 return pool_obj; 122 } 123 124 // Get the address of the object we created via call_special. 125 pool_obj = pool(); 126 127 // Use store barrier to make sure the memory accesses associated 128 // with creating the pool are visible before publishing its address. 129 // The unlock will publish the store to _memory_pool_obj because 130 // it does a release first. 131 OrderAccess::release_store_ptr(&_memory_pool_obj, pool_obj); 132 } 133 } 134 135 return pool_obj; 136 } 137 138 inline static size_t get_max_value(size_t val1, size_t val2) { 139 return (val1 > val2 ? val1 : val2); 140 } 141 142 void MemoryPool::record_peak_memory_usage() { 143 // Caller in JDK is responsible for synchronization - 144 // acquire the lock for this memory pool before calling VM 145 MemoryUsage usage = get_memory_usage(); 146 size_t peak_used = get_max_value(usage.used(), _peak_usage.used()); 147 size_t peak_committed = get_max_value(usage.committed(), _peak_usage.committed()); 148 size_t peak_max_size = get_max_value(usage.max_size(), _peak_usage.max_size()); 149 150 _peak_usage = MemoryUsage(initial_size(), peak_used, peak_committed, peak_max_size); 151 } 152 153 static void set_sensor_obj_at(SensorInfo** sensor_ptr, instanceHandle sh) { 154 assert(*sensor_ptr == NULL, "Should be called only once"); 155 SensorInfo* sensor = new SensorInfo(); 156 sensor->set_sensor(sh()); 157 *sensor_ptr = sensor; 158 } 159 160 void MemoryPool::set_usage_sensor_obj(instanceHandle sh) { 161 set_sensor_obj_at(&_usage_sensor, sh); 162 } 163 164 void MemoryPool::set_gc_usage_sensor_obj(instanceHandle sh) { 165 set_sensor_obj_at(&_gc_usage_sensor, sh); 166 } 167 168 void MemoryPool::oops_do(OopClosure* f) { 169 f->do_oop((oop*) &_memory_pool_obj); 170 if (_usage_sensor != NULL) { 171 _usage_sensor->oops_do(f); 172 } 173 if (_gc_usage_sensor != NULL) { 174 _gc_usage_sensor->oops_do(f); 175 } 176 } 177 178 ContiguousSpacePool::ContiguousSpacePool(ContiguousSpace* space, 179 const char* name, 180 PoolType type, 181 size_t max_size, 182 bool support_usage_threshold) : 183 CollectedMemoryPool(name, type, space->capacity(), max_size, 184 support_usage_threshold), _space(space) { 185 } 186 187 MemoryUsage ContiguousSpacePool::get_memory_usage() { 188 size_t maxSize = (available_for_allocation() ? max_size() : 0); 189 size_t used = used_in_bytes(); 190 size_t committed = _space->capacity(); 191 192 return MemoryUsage(initial_size(), used, committed, maxSize); 193 } 194 195 SurvivorContiguousSpacePool::SurvivorContiguousSpacePool(DefNewGeneration* gen, 196 const char* name, 197 PoolType type, 198 size_t max_size, 199 bool support_usage_threshold) : 200 CollectedMemoryPool(name, type, gen->from()->capacity(), max_size, 201 support_usage_threshold), _gen(gen) { 202 } 203 204 MemoryUsage SurvivorContiguousSpacePool::get_memory_usage() { 205 size_t maxSize = (available_for_allocation() ? max_size() : 0); 206 size_t used = used_in_bytes(); 207 size_t committed = committed_in_bytes(); 208 209 return MemoryUsage(initial_size(), used, committed, maxSize); 210 } 211 212 #if INCLUDE_ALL_GCS 213 CompactibleFreeListSpacePool::CompactibleFreeListSpacePool(CompactibleFreeListSpace* space, 214 const char* name, 215 PoolType type, 216 size_t max_size, 217 bool support_usage_threshold) : 218 CollectedMemoryPool(name, type, space->capacity(), max_size, 219 support_usage_threshold), _space(space) { 220 } 221 222 MemoryUsage CompactibleFreeListSpacePool::get_memory_usage() { 223 size_t maxSize = (available_for_allocation() ? max_size() : 0); 224 size_t used = used_in_bytes(); 225 size_t committed = _space->capacity(); 226 227 return MemoryUsage(initial_size(), used, committed, maxSize); 228 } 229 #endif // INCLUDE_ALL_GCS 230 231 GenerationPool::GenerationPool(Generation* gen, 232 const char* name, 233 PoolType type, 234 bool support_usage_threshold) : 235 CollectedMemoryPool(name, type, gen->capacity(), gen->max_capacity(), 236 support_usage_threshold), _gen(gen) { 237 } 238 239 MemoryUsage GenerationPool::get_memory_usage() { 240 size_t used = used_in_bytes(); 241 size_t committed = _gen->capacity(); 242 size_t maxSize = (available_for_allocation() ? max_size() : 0); 243 244 return MemoryUsage(initial_size(), used, committed, maxSize); 245 } 246 247 CodeHeapPool::CodeHeapPool(CodeHeap* codeHeap, const char* name, bool support_usage_threshold) : 248 MemoryPool(name, NonHeap, codeHeap->capacity(), codeHeap->max_capacity(), 249 support_usage_threshold, false), _codeHeap(codeHeap) { 250 } 251 252 MemoryUsage CodeHeapPool::get_memory_usage() { 253 size_t used = used_in_bytes(); 254 size_t committed = _codeHeap->capacity(); 255 size_t maxSize = (available_for_allocation() ? max_size() : 0); 256 257 return MemoryUsage(initial_size(), used, committed, maxSize); 258 }