1 /* 2 * Copyright (c) 2003, 2016, 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 "memory/allocation.hpp" 28 #include "memory/resourceArea.hpp" 29 #include "memory/universe.hpp" 30 #include "oops/oop.inline.hpp" 31 #include "runtime/mutexLocker.hpp" 32 #include "services/classLoadingService.hpp" 33 #include "services/memoryService.hpp" 34 #include "utilities/dtrace.hpp" 35 #include "utilities/macros.hpp" 36 #include "utilities/defaultStream.hpp" 37 #include "logging/log.hpp" 38 #include "logging/logConfiguration.hpp" 39 40 #ifdef DTRACE_ENABLED 41 42 // Only bother with this argument setup if dtrace is available 43 44 #define HOTSPOT_CLASS_unloaded HOTSPOT_CLASS_UNLOADED 45 #define HOTSPOT_CLASS_loaded HOTSPOT_CLASS_LOADED 46 #define DTRACE_CLASSLOAD_PROBE(type, clss, shared) \ 47 { \ 48 char* data = NULL; \ 49 int len = 0; \ 50 Symbol* name = (clss)->name(); \ 51 if (name != NULL) { \ 52 data = (char*)name->bytes(); \ 53 len = name->utf8_length(); \ 54 } \ 55 HOTSPOT_CLASS_##type( /* type = unloaded, loaded */ \ 56 data, len, (clss)->class_loader(), (shared)); \ 57 } 58 59 #else // ndef DTRACE_ENABLED 60 61 #define DTRACE_CLASSLOAD_PROBE(type, clss, shared) 62 63 #endif 64 65 #if INCLUDE_MANAGEMENT 66 // counters for classes loaded from class files 67 PerfCounter* ClassLoadingService::_classes_loaded_count = NULL; 68 PerfCounter* ClassLoadingService::_classes_unloaded_count = NULL; 69 PerfCounter* ClassLoadingService::_classbytes_loaded = NULL; 70 PerfCounter* ClassLoadingService::_classbytes_unloaded = NULL; 71 72 // counters for classes loaded from shared archive 73 PerfCounter* ClassLoadingService::_shared_classes_loaded_count = NULL; 74 PerfCounter* ClassLoadingService::_shared_classes_unloaded_count = NULL; 75 PerfCounter* ClassLoadingService::_shared_classbytes_loaded = NULL; 76 PerfCounter* ClassLoadingService::_shared_classbytes_unloaded = NULL; 77 PerfVariable* ClassLoadingService::_class_methods_size = NULL; 78 79 void ClassLoadingService::init() { 80 EXCEPTION_MARK; 81 82 // These counters are for java.lang.management API support. 83 // They are created even if -XX:-UsePerfData is set and in 84 // that case, they will be allocated on C heap. 85 _classes_loaded_count = 86 PerfDataManager::create_counter(JAVA_CLS, "loadedClasses", 87 PerfData::U_Events, CHECK); 88 89 _classes_unloaded_count = 90 PerfDataManager::create_counter(JAVA_CLS, "unloadedClasses", 91 PerfData::U_Events, CHECK); 92 93 _shared_classes_loaded_count = 94 PerfDataManager::create_counter(JAVA_CLS, "sharedLoadedClasses", 95 PerfData::U_Events, CHECK); 96 97 _shared_classes_unloaded_count = 98 PerfDataManager::create_counter(JAVA_CLS, "sharedUnloadedClasses", 99 PerfData::U_Events, CHECK); 100 101 if (UsePerfData) { 102 _classbytes_loaded = 103 PerfDataManager::create_counter(SUN_CLS, "loadedBytes", 104 PerfData::U_Bytes, CHECK); 105 106 _classbytes_unloaded = 107 PerfDataManager::create_counter(SUN_CLS, "unloadedBytes", 108 PerfData::U_Bytes, CHECK); 109 _shared_classbytes_loaded = 110 PerfDataManager::create_counter(SUN_CLS, "sharedLoadedBytes", 111 PerfData::U_Bytes, CHECK); 112 113 _shared_classbytes_unloaded = 114 PerfDataManager::create_counter(SUN_CLS, "sharedUnloadedBytes", 115 PerfData::U_Bytes, CHECK); 116 _class_methods_size = 117 PerfDataManager::create_variable(SUN_CLS, "methodBytes", 118 PerfData::U_Bytes, CHECK); 119 } 120 } 121 122 void ClassLoadingService::notify_class_unloaded(InstanceKlass* k) { 123 DTRACE_CLASSLOAD_PROBE(unloaded, k, false); 124 // Classes that can be unloaded must be non-shared 125 _classes_unloaded_count->inc(); 126 127 if (UsePerfData) { 128 // add the class size 129 size_t size = compute_class_size(k); 130 _classbytes_unloaded->inc(size); 131 132 // Compute method size & subtract from running total. 133 // We are called during phase 1 of mark sweep, so it's 134 // still ok to iterate through Method*s here. 135 Array<Method*>* methods = k->methods(); 136 for (int i = 0; i < methods->length(); i++) { 137 _class_methods_size->inc(-methods->at(i)->size()); 138 } 139 } 140 141 if (log_is_enabled(Info, class, unload)) { 142 ResourceMark rm; 143 log_info(class, unload)("unloading class %s " INTPTR_FORMAT , k->external_name(), p2i(k)); 144 } 145 } 146 147 void ClassLoadingService::notify_class_loaded(InstanceKlass* k, bool shared_class) { 148 DTRACE_CLASSLOAD_PROBE(loaded, k, shared_class); 149 PerfCounter* classes_counter = (shared_class ? _shared_classes_loaded_count 150 : _classes_loaded_count); 151 // increment the count 152 classes_counter->inc(); 153 154 if (UsePerfData) { 155 PerfCounter* classbytes_counter = (shared_class ? _shared_classbytes_loaded 156 : _classbytes_loaded); 157 // add the class size 158 size_t size = compute_class_size(k); 159 classbytes_counter->inc(size); 160 } 161 } 162 163 size_t ClassLoadingService::compute_class_size(InstanceKlass* k) { 164 // lifted from ClassStatistics.do_class(Klass* k) 165 166 size_t class_size = 0; 167 168 class_size += k->size(); 169 170 if (k->is_instance_klass()) { 171 class_size += k->methods()->size(); 172 // FIXME: Need to count the contents of methods 173 class_size += k->constants()->size(); 174 class_size += k->local_interfaces()->size(); 175 class_size += k->transitive_interfaces()->size(); 176 // We do not have to count implementors, since we only store one! 177 // FIXME: How should these be accounted for, now when they have moved. 178 //class_size += k->fields()->size(); 179 } 180 return class_size * oopSize; 181 } 182 183 bool ClassLoadingService::set_verbose(bool verbose) { 184 MutexLocker m(Management_lock); 185 // verbose will be set to the previous value 186 LogLevelType level = verbose ? LogLevel::Info : LogLevel::Off; 187 LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, load)); 188 reset_trace_class_unloading(); 189 return verbose; 190 } 191 192 // Caller to this function must own Management_lock 193 void ClassLoadingService::reset_trace_class_unloading() { 194 assert(Management_lock->owned_by_self(), "Must own the Management_lock"); 195 bool value = MemoryService::get_verbose() || ClassLoadingService::get_verbose(); 196 LogLevelType level = value ? LogLevel::Info : LogLevel::Off; 197 LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, unload)); 198 } 199 200 GrowableArray<KlassHandle>* LoadedClassesEnumerator::_loaded_classes = NULL; 201 Thread* LoadedClassesEnumerator::_current_thread = NULL; 202 203 LoadedClassesEnumerator::LoadedClassesEnumerator(Thread* cur_thread) { 204 assert(cur_thread == Thread::current(), "Check current thread"); 205 206 int init_size = ClassLoadingService::loaded_class_count(); 207 _klass_handle_array = new GrowableArray<KlassHandle>(init_size); 208 209 // For consistency of the loaded classes, grab the SystemDictionary lock 210 MutexLocker sd_mutex(SystemDictionary_lock); 211 212 // Set _loaded_classes and _current_thread and begin enumerating all classes. 213 // Only one thread will do the enumeration at a time. 214 // These static variables are needed and they are used by the static method 215 // add_loaded_class called from classes_do(). 216 _loaded_classes = _klass_handle_array; 217 _current_thread = cur_thread; 218 219 SystemDictionary::classes_do(&add_loaded_class); 220 221 // FIXME: Exclude array klasses for now 222 // Universe::basic_type_classes_do(&add_loaded_class); 223 } 224 225 #endif // INCLUDE_MANAGEMENT