1 /* 2 * Copyright (c) 2003, 2010, 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 36 MemoryPool::MemoryPool(const char* name, 37 PoolType type, 38 size_t init_size, 39 size_t max_size, 40 bool support_usage_threshold, 41 bool support_gc_threshold) { 42 _name = name; 43 _initial_size = init_size; 44 _max_size = max_size; 45 _memory_pool_obj = NULL; 46 _available_for_allocation = true; 47 _num_managers = 0; 48 _type = type; 49 50 // initialize the max and init size of collection usage 51 _after_gc_usage = MemoryUsage(_initial_size, 0, 0, _max_size); 52 53 _usage_sensor = NULL; 54 _gc_usage_sensor = NULL; 55 // usage threshold supports both high and low threshold 56 _usage_threshold = new ThresholdSupport(support_usage_threshold, support_usage_threshold); 57 // gc usage threshold supports only high threshold 58 _gc_usage_threshold = new ThresholdSupport(support_gc_threshold, support_gc_threshold); 59 } 60 61 void MemoryPool::add_manager(MemoryManager* mgr) { 62 assert(_num_managers < MemoryPool::max_num_managers, "_num_managers exceeds the max"); 63 if (_num_managers < MemoryPool::max_num_managers) { 64 _managers[_num_managers] = mgr; 65 _num_managers++; 66 } 67 } 68 69 70 // Returns an instanceHandle of a MemoryPool object. 71 // It creates a MemoryPool instance when the first time 72 // this function is called. 73 instanceOop MemoryPool::get_memory_pool_instance(TRAPS) { 74 // Must do an acquire so as to force ordering of subsequent 75 // loads from anything _memory_pool_obj points to or implies. 76 instanceOop pool_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_pool_obj); 77 if (pool_obj == NULL) { 78 // It's ok for more than one thread to execute the code up to the locked region. 79 // Extra pool instances will just be gc'ed. 80 klassOop k = Management::sun_management_ManagementFactory_klass(CHECK_NULL); 81 instanceKlassHandle ik(THREAD, k); 82 83 Handle pool_name = java_lang_String::create_from_str(_name, CHECK_NULL); 84 jlong usage_threshold_value = (_usage_threshold->is_high_threshold_supported() ? 0 : -1L); 85 jlong gc_usage_threshold_value = (_gc_usage_threshold->is_high_threshold_supported() ? 0 : -1L); 86 87 JavaValue result(T_OBJECT); 88 JavaCallArguments args; 89 args.push_oop(pool_name); // Argument 1 90 args.push_int((int) is_heap()); // Argument 2 91 92 symbolHandle method_name = vmSymbolHandles::createMemoryPool_name(); 93 symbolHandle signature = vmSymbolHandles::createMemoryPool_signature(); 94 95 args.push_long(usage_threshold_value); // Argument 3 96 args.push_long(gc_usage_threshold_value); // Argument 4 97 98 JavaCalls::call_static(&result, 99 ik, 100 method_name, 101 signature, 102 &args, 103 CHECK_NULL); 104 105 instanceOop p = (instanceOop) result.get_jobject(); 106 instanceHandle pool(THREAD, p); 107 108 { 109 // Get lock since another thread may have create the instance 110 MutexLocker ml(Management_lock); 111 112 // Check if another thread has created the pool. We reload 113 // _memory_pool_obj here because some other thread may have 114 // initialized it while we were executing the code before the lock. 115 // 116 // The lock has done an acquire, so the load can't float above it, 117 // but we need to do a load_acquire as above. 118 pool_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_pool_obj); 119 if (pool_obj != NULL) { 120 return pool_obj; 121 } 122 123 // Get the address of the object we created via call_special. 124 pool_obj = pool(); 125 126 // Use store barrier to make sure the memory accesses associated 127 // with creating the pool are visible before publishing its address. 128 // The unlock will publish the store to _memory_pool_obj because 129 // it does a release first. 130 OrderAccess::release_store_ptr(&_memory_pool_obj, pool_obj); 131 } 132 } 133 134 return pool_obj; 135 } 136 137 inline static size_t get_max_value(size_t val1, size_t val2) { 138 return (val1 > val2 ? val1 : val2); 139 } 140 141 void MemoryPool::record_peak_memory_usage() { 142 // Caller in JDK is responsible for synchronization - 143 // acquire the lock for this memory pool before calling VM 144 MemoryUsage usage = get_memory_usage(); 145 size_t peak_used = get_max_value(usage.used(), _peak_usage.used()); 146 size_t peak_committed = get_max_value(usage.committed(), _peak_usage.committed()); 147 size_t peak_max_size = get_max_value(usage.max_size(), _peak_usage.max_size()); 148 149 _peak_usage = MemoryUsage(initial_size(), peak_used, peak_committed, peak_max_size); 150 } 151 152 static void set_sensor_obj_at(SensorInfo** sensor_ptr, instanceHandle sh) { 153 assert(*sensor_ptr == NULL, "Should be called only once"); 154 SensorInfo* sensor = new SensorInfo(); 155 sensor->set_sensor(sh()); 156 *sensor_ptr = sensor; 157 } 158 159 void MemoryPool::set_usage_sensor_obj(instanceHandle sh) { 160 set_sensor_obj_at(&_usage_sensor, sh); 161 } 162 163 void MemoryPool::set_gc_usage_sensor_obj(instanceHandle sh) { 164 set_sensor_obj_at(&_gc_usage_sensor, sh); 165 } 166 167 void MemoryPool::oops_do(OopClosure* f) { 168 f->do_oop((oop*) &_memory_pool_obj); 169 if (_usage_sensor != NULL) { 170 _usage_sensor->oops_do(f); 171 } 172 if (_gc_usage_sensor != NULL) { 173 _gc_usage_sensor->oops_do(f); 174 } 175 } 176 177 ContiguousSpacePool::ContiguousSpacePool(ContiguousSpace* space, 178 const char* name, 179 PoolType type, 180 size_t max_size, 181 bool support_usage_threshold) : 182 CollectedMemoryPool(name, type, space->capacity(), max_size, 183 support_usage_threshold), _space(space) { 184 } 185 186 MemoryUsage ContiguousSpacePool::get_memory_usage() { 187 size_t maxSize = (available_for_allocation() ? max_size() : 0); 188 size_t used = used_in_bytes(); 189 size_t committed = _space->capacity(); 190 191 return MemoryUsage(initial_size(), used, committed, maxSize); 192 } 193 194 SurvivorContiguousSpacePool::SurvivorContiguousSpacePool(DefNewGeneration* gen, 195 const char* name, 196 PoolType type, 197 size_t max_size, 198 bool support_usage_threshold) : 199 CollectedMemoryPool(name, type, gen->from()->capacity(), max_size, 200 support_usage_threshold), _gen(gen) { 201 } 202 203 MemoryUsage SurvivorContiguousSpacePool::get_memory_usage() { 204 size_t maxSize = (available_for_allocation() ? max_size() : 0); 205 size_t used = used_in_bytes(); 206 size_t committed = committed_in_bytes(); 207 208 return MemoryUsage(initial_size(), used, committed, maxSize); 209 } 210 211 #ifndef SERIALGC 212 CompactibleFreeListSpacePool::CompactibleFreeListSpacePool(CompactibleFreeListSpace* space, 213 const char* name, 214 PoolType type, 215 size_t max_size, 216 bool support_usage_threshold) : 217 CollectedMemoryPool(name, type, space->capacity(), max_size, 218 support_usage_threshold), _space(space) { 219 } 220 221 MemoryUsage CompactibleFreeListSpacePool::get_memory_usage() { 222 size_t maxSize = (available_for_allocation() ? max_size() : 0); 223 size_t used = used_in_bytes(); 224 size_t committed = _space->capacity(); 225 226 return MemoryUsage(initial_size(), used, committed, maxSize); 227 } 228 #endif // SERIALGC 229 230 GenerationPool::GenerationPool(Generation* gen, 231 const char* name, 232 PoolType type, 233 bool support_usage_threshold) : 234 CollectedMemoryPool(name, type, gen->capacity(), gen->max_capacity(), 235 support_usage_threshold), _gen(gen) { 236 } 237 238 MemoryUsage GenerationPool::get_memory_usage() { 239 size_t used = used_in_bytes(); 240 size_t committed = _gen->capacity(); 241 size_t maxSize = (available_for_allocation() ? max_size() : 0); 242 243 return MemoryUsage(initial_size(), used, committed, maxSize); 244 } 245 246 CodeHeapPool::CodeHeapPool(CodeHeap* codeHeap, const char* name, bool support_usage_threshold) : 247 MemoryPool(name, NonHeap, codeHeap->capacity(), codeHeap->max_capacity(), 248 support_usage_threshold, false), _codeHeap(codeHeap) { 249 } 250 251 MemoryUsage CodeHeapPool::get_memory_usage() { 252 size_t used = used_in_bytes(); 253 size_t committed = _codeHeap->capacity(); 254 size_t maxSize = (available_for_allocation() ? max_size() : 0); 255 256 return MemoryUsage(initial_size(), used, committed, maxSize); 257 }