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 "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/globalDefinitions.hpp" 38 #include "utilities/macros.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 = OrderAccess::load_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 InstanceKlass* ik = Management::sun_management_ManagementFactoryHelper_klass(CHECK_NULL); 85 86 Handle pool_name = java_lang_String::create_from_str(_name, CHECK_NULL); 87 jlong usage_threshold_value = (_usage_threshold->is_high_threshold_supported() ? 0 : -1L); 88 jlong gc_usage_threshold_value = (_gc_usage_threshold->is_high_threshold_supported() ? 0 : -1L); 89 90 JavaValue result(T_OBJECT); 91 JavaCallArguments args; 92 args.push_oop(pool_name); // Argument 1 93 args.push_int((int) is_heap()); // Argument 2 94 95 Symbol* method_name = vmSymbols::createMemoryPool_name(); 96 Symbol* signature = vmSymbols::createMemoryPool_signature(); 97 98 args.push_long(usage_threshold_value); // Argument 3 99 args.push_long(gc_usage_threshold_value); // Argument 4 100 101 JavaCalls::call_static(&result, 102 ik, 103 method_name, 104 signature, 105 &args, 106 CHECK_NULL); 107 108 instanceOop p = (instanceOop) result.get_jobject(); 109 instanceHandle pool(THREAD, p); 110 111 { 112 // Get lock since another thread may have create the instance 113 MutexLocker ml(Management_lock); 114 115 // Check if another thread has created the pool. We reload 116 // _memory_pool_obj here because some other thread may have 117 // initialized it while we were executing the code before the lock. 118 // 119 // The lock has done an acquire, so the load can't float above it, 120 // but we need to do a load_acquire as above. 121 pool_obj = OrderAccess::load_acquire(&_memory_pool_obj); 122 if (pool_obj != NULL) { 123 return pool_obj; 124 } 125 126 // Get the address of the object we created via call_special. 127 pool_obj = pool(); 128 129 // Use store barrier to make sure the memory accesses associated 130 // with creating the pool are visible before publishing its address. 131 // The unlock will publish the store to _memory_pool_obj because 132 // it does a release first. 133 OrderAccess::release_store(&_memory_pool_obj, pool_obj); 134 } 135 } 136 137 return pool_obj; 138 } 139 140 inline static size_t get_max_value(size_t val1, size_t val2) { 141 return (val1 > val2 ? val1 : val2); 142 } 143 144 void MemoryPool::record_peak_memory_usage() { 145 // Caller in JDK is responsible for synchronization - 146 // acquire the lock for this memory pool before calling VM 147 MemoryUsage usage = get_memory_usage(); 148 size_t peak_used = get_max_value(usage.used(), _peak_usage.used()); 149 size_t peak_committed = get_max_value(usage.committed(), _peak_usage.committed()); 150 size_t peak_max_size = get_max_value(usage.max_size(), _peak_usage.max_size()); 151 152 _peak_usage = MemoryUsage(initial_size(), peak_used, peak_committed, peak_max_size); 153 } 154 155 static void set_sensor_obj_at(SensorInfo** sensor_ptr, instanceHandle sh) { 156 assert(*sensor_ptr == NULL, "Should be called only once"); 157 SensorInfo* sensor = new SensorInfo(); 158 sensor->set_sensor(sh()); 159 *sensor_ptr = sensor; 160 } 161 162 void MemoryPool::set_usage_sensor_obj(instanceHandle sh) { 163 set_sensor_obj_at(&_usage_sensor, sh); 164 } 165 166 void MemoryPool::set_gc_usage_sensor_obj(instanceHandle sh) { 167 set_sensor_obj_at(&_gc_usage_sensor, sh); 168 } 169 170 void MemoryPool::oops_do(OopClosure* f) { 171 f->do_oop((oop*) &_memory_pool_obj); 172 if (_usage_sensor != NULL) { 173 _usage_sensor->oops_do(f); 174 } 175 if (_gc_usage_sensor != NULL) { 176 _gc_usage_sensor->oops_do(f); 177 } 178 } 179 180 CodeHeapPool::CodeHeapPool(CodeHeap* codeHeap, const char* name, bool support_usage_threshold) : 181 MemoryPool(name, NonHeap, codeHeap->capacity(), codeHeap->max_capacity(), 182 support_usage_threshold, false), _codeHeap(codeHeap) { 183 } 184 185 MemoryUsage CodeHeapPool::get_memory_usage() { 186 size_t used = used_in_bytes(); 187 size_t committed = _codeHeap->capacity(); 188 size_t maxSize = (available_for_allocation() ? max_size() : 0); 189 190 return MemoryUsage(initial_size(), used, committed, maxSize); 191 } 192 193 MetaspacePool::MetaspacePool() : 194 MemoryPool("Metaspace", NonHeap, 0, calculate_max_size(), true, false) { } 195 196 MemoryUsage MetaspacePool::get_memory_usage() { 197 size_t committed = MetaspaceAux::committed_bytes(); 198 return MemoryUsage(initial_size(), used_in_bytes(), committed, max_size()); 199 } 200 201 size_t MetaspacePool::used_in_bytes() { 202 return MetaspaceAux::used_bytes(); 203 } 204 205 size_t MetaspacePool::calculate_max_size() const { 206 return FLAG_IS_CMDLINE(MaxMetaspaceSize) ? MaxMetaspaceSize : 207 MemoryUsage::undefined_size(); 208 } 209 210 CompressedKlassSpacePool::CompressedKlassSpacePool() : 211 MemoryPool("Compressed Class Space", NonHeap, 0, CompressedClassSpaceSize, true, false) { } 212 213 size_t CompressedKlassSpacePool::used_in_bytes() { 214 return MetaspaceAux::used_bytes(Metaspace::ClassType); 215 } 216 217 MemoryUsage CompressedKlassSpacePool::get_memory_usage() { 218 size_t committed = MetaspaceAux::committed_bytes(Metaspace::ClassType); 219 return MemoryUsage(initial_size(), used_in_bytes(), committed, max_size()); 220 }