Mercurial > hg > truffle
annotate src/share/vm/services/classLoadingService.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | 436b4a3231bf |
| children | fb19af007ffc |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/systemDictionary.hpp" | |
| 27 #include "memory/allocation.hpp" | |
| 28 #include "memory/universe.hpp" | |
| 29 #include "oops/oop.inline.hpp" | |
| 30 #include "runtime/mutexLocker.hpp" | |
| 31 #include "services/classLoadingService.hpp" | |
| 32 #include "services/memoryService.hpp" | |
| 33 #include "utilities/dtrace.hpp" | |
| 0 | 34 |
| 35 #ifdef DTRACE_ENABLED | |
| 36 | |
| 37 // Only bother with this argument setup if dtrace is available | |
| 38 | |
| 4006 | 39 #ifndef USDT2 |
| 40 | |
| 0 | 41 HS_DTRACE_PROBE_DECL4(hotspot, class__loaded, char*, int, oop, bool); |
| 42 HS_DTRACE_PROBE_DECL4(hotspot, class__unloaded, char*, int, oop, bool); | |
| 43 | |
| 44 #define DTRACE_CLASSLOAD_PROBE(type, clss, shared) \ | |
| 45 { \ | |
| 46 char* data = NULL; \ | |
| 47 int len = 0; \ | |
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48 Symbol* name = (clss)->name(); \ |
| 0 | 49 if (name != NULL) { \ |
| 50 data = (char*)name->bytes(); \ | |
| 51 len = name->utf8_length(); \ | |
| 52 } \ | |
| 53 HS_DTRACE_PROBE4(hotspot, class__##type, \ | |
| 54 data, len, (clss)->class_loader(), (shared)); \ | |
| 55 } | |
| 56 | |
| 4006 | 57 #else /* USDT2 */ |
| 58 | |
| 59 #define HOTSPOT_CLASS_unloaded HOTSPOT_CLASS_UNLOADED | |
| 60 #define HOTSPOT_CLASS_loaded HOTSPOT_CLASS_LOADED | |
| 61 #define DTRACE_CLASSLOAD_PROBE(type, clss, shared) \ | |
| 62 { \ | |
| 63 char* data = NULL; \ | |
| 64 int len = 0; \ | |
| 65 Symbol* name = (clss)->name(); \ | |
| 66 if (name != NULL) { \ | |
| 67 data = (char*)name->bytes(); \ | |
| 68 len = name->utf8_length(); \ | |
| 69 } \ | |
| 70 HOTSPOT_CLASS_##type( /* type = unloaded, loaded */ \ | |
| 71 data, len, (clss)->class_loader(), (shared)); \ | |
| 72 } | |
| 73 | |
| 74 #endif /* USDT2 */ | |
| 0 | 75 #else // ndef DTRACE_ENABLED |
| 76 | |
| 77 #define DTRACE_CLASSLOAD_PROBE(type, clss, shared) | |
| 78 | |
| 79 #endif | |
| 80 | |
| 81 // counters for classes loaded from class files | |
| 82 PerfCounter* ClassLoadingService::_classes_loaded_count = NULL; | |
| 83 PerfCounter* ClassLoadingService::_classes_unloaded_count = NULL; | |
| 84 PerfCounter* ClassLoadingService::_classbytes_loaded = NULL; | |
| 85 PerfCounter* ClassLoadingService::_classbytes_unloaded = NULL; | |
| 86 | |
| 87 // counters for classes loaded from shared archive | |
| 88 PerfCounter* ClassLoadingService::_shared_classes_loaded_count = NULL; | |
| 89 PerfCounter* ClassLoadingService::_shared_classes_unloaded_count = NULL; | |
| 90 PerfCounter* ClassLoadingService::_shared_classbytes_loaded = NULL; | |
| 91 PerfCounter* ClassLoadingService::_shared_classbytes_unloaded = NULL; | |
| 92 PerfVariable* ClassLoadingService::_class_methods_size = NULL; | |
| 93 | |
| 94 void ClassLoadingService::init() { | |
| 95 EXCEPTION_MARK; | |
| 96 | |
| 97 // These counters are for java.lang.management API support. | |
| 98 // They are created even if -XX:-UsePerfData is set and in | |
| 99 // that case, they will be allocated on C heap. | |
| 100 _classes_loaded_count = | |
| 101 PerfDataManager::create_counter(JAVA_CLS, "loadedClasses", | |
| 102 PerfData::U_Events, CHECK); | |
| 103 | |
| 104 _classes_unloaded_count = | |
| 105 PerfDataManager::create_counter(JAVA_CLS, "unloadedClasses", | |
| 106 PerfData::U_Events, CHECK); | |
| 107 | |
| 108 _shared_classes_loaded_count = | |
| 109 PerfDataManager::create_counter(JAVA_CLS, "sharedLoadedClasses", | |
| 110 PerfData::U_Events, CHECK); | |
| 111 | |
| 112 _shared_classes_unloaded_count = | |
| 113 PerfDataManager::create_counter(JAVA_CLS, "sharedUnloadedClasses", | |
| 114 PerfData::U_Events, CHECK); | |
| 115 | |
| 116 if (UsePerfData) { | |
| 117 _classbytes_loaded = | |
| 118 PerfDataManager::create_counter(SUN_CLS, "loadedBytes", | |
| 119 PerfData::U_Bytes, CHECK); | |
| 120 | |
| 121 _classbytes_unloaded = | |
| 122 PerfDataManager::create_counter(SUN_CLS, "unloadedBytes", | |
| 123 PerfData::U_Bytes, CHECK); | |
| 124 _shared_classbytes_loaded = | |
| 125 PerfDataManager::create_counter(SUN_CLS, "sharedLoadedBytes", | |
| 126 PerfData::U_Bytes, CHECK); | |
| 127 | |
| 128 _shared_classbytes_unloaded = | |
| 129 PerfDataManager::create_counter(SUN_CLS, "sharedUnloadedBytes", | |
| 130 PerfData::U_Bytes, CHECK); | |
| 131 _class_methods_size = | |
| 132 PerfDataManager::create_variable(SUN_CLS, "methodBytes", | |
| 133 PerfData::U_Bytes, CHECK); | |
| 134 } | |
| 135 } | |
| 136 | |
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137 void ClassLoadingService::notify_class_unloaded(InstanceKlass* k) { |
| 0 | 138 DTRACE_CLASSLOAD_PROBE(unloaded, k, false); |
| 139 // Classes that can be unloaded must be non-shared | |
| 140 _classes_unloaded_count->inc(); | |
| 141 | |
| 142 if (UsePerfData) { | |
| 143 // add the class size | |
| 144 size_t size = compute_class_size(k); | |
| 145 _classbytes_unloaded->inc(size); | |
| 146 | |
| 147 // Compute method size & subtract from running total. | |
| 148 // We are called during phase 1 of mark sweep, so it's | |
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149 // still ok to iterate through Method*s here. |
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150 Array<Method*>* methods = k->methods(); |
| 0 | 151 for (int i = 0; i < methods->length(); i++) { |
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152 _class_methods_size->inc(-methods->at(i)->size()); |
| 0 | 153 } |
| 154 } | |
| 155 | |
| 156 if (TraceClassUnloading) { | |
| 157 ResourceMark rm; | |
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158 tty->print_cr("[Unloading class %s " INTPTR_FORMAT "]", k->external_name(), k); |
| 0 | 159 } |
| 160 } | |
| 161 | |
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162 void ClassLoadingService::notify_class_loaded(InstanceKlass* k, bool shared_class) { |
| 0 | 163 DTRACE_CLASSLOAD_PROBE(loaded, k, shared_class); |
| 164 PerfCounter* classes_counter = (shared_class ? _shared_classes_loaded_count | |
| 165 : _classes_loaded_count); | |
| 166 // increment the count | |
| 167 classes_counter->inc(); | |
| 168 | |
| 169 if (UsePerfData) { | |
| 170 PerfCounter* classbytes_counter = (shared_class ? _shared_classbytes_loaded | |
| 171 : _classbytes_loaded); | |
| 172 // add the class size | |
| 173 size_t size = compute_class_size(k); | |
| 174 classbytes_counter->inc(size); | |
| 175 } | |
| 176 } | |
| 177 | |
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178 size_t ClassLoadingService::compute_class_size(InstanceKlass* k) { |
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179 // lifted from ClassStatistics.do_class(Klass* k) |
| 0 | 180 |
| 181 size_t class_size = 0; | |
| 182 | |
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183 class_size += k->size(); |
| 0 | 184 |
| 185 if (k->oop_is_instance()) { | |
| 186 class_size += k->methods()->size(); | |
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187 // FIXME: Need to count the contents of methods |
| 0 | 188 class_size += k->constants()->size(); |
| 189 class_size += k->local_interfaces()->size(); | |
| 190 class_size += k->transitive_interfaces()->size(); | |
| 191 // We do not have to count implementors, since we only store one! | |
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192 // FIXME: How should these be accounted for, now when they have moved. |
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193 //class_size += k->fields()->size(); |
| 0 | 194 } |
| 195 return class_size * oopSize; | |
| 196 } | |
| 197 | |
| 198 | |
| 199 bool ClassLoadingService::set_verbose(bool verbose) { | |
| 200 MutexLocker m(Management_lock); | |
| 201 | |
| 202 // verbose will be set to the previous value | |
| 203 bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassLoading", &verbose, MANAGEMENT); | |
| 204 assert(succeed, "Setting TraceClassLoading flag fails"); | |
| 205 reset_trace_class_unloading(); | |
| 206 | |
| 207 return verbose; | |
| 208 } | |
| 209 | |
| 210 // Caller to this function must own Management_lock | |
| 211 void ClassLoadingService::reset_trace_class_unloading() { | |
| 212 assert(Management_lock->owned_by_self(), "Must own the Management_lock"); | |
| 213 bool value = MemoryService::get_verbose() || ClassLoadingService::get_verbose(); | |
| 214 bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassUnloading", &value, MANAGEMENT); | |
| 215 assert(succeed, "Setting TraceClassUnLoading flag fails"); | |
| 216 } | |
| 217 | |
| 218 GrowableArray<KlassHandle>* LoadedClassesEnumerator::_loaded_classes = NULL; | |
| 219 Thread* LoadedClassesEnumerator::_current_thread = NULL; | |
| 220 | |
| 221 LoadedClassesEnumerator::LoadedClassesEnumerator(Thread* cur_thread) { | |
| 222 assert(cur_thread == Thread::current(), "Check current thread"); | |
| 223 | |
| 224 int init_size = ClassLoadingService::loaded_class_count(); | |
| 225 _klass_handle_array = new GrowableArray<KlassHandle>(init_size); | |
| 226 | |
| 227 // For consistency of the loaded classes, grab the SystemDictionary lock | |
| 228 MutexLocker sd_mutex(SystemDictionary_lock); | |
| 229 | |
| 230 // Set _loaded_classes and _current_thread and begin enumerating all classes. | |
| 231 // Only one thread will do the enumeration at a time. | |
| 232 // These static variables are needed and they are used by the static method | |
| 233 // add_loaded_class called from classes_do(). | |
| 234 _loaded_classes = _klass_handle_array; | |
| 235 _current_thread = cur_thread; | |
| 236 | |
| 237 SystemDictionary::classes_do(&add_loaded_class); | |
| 238 | |
| 239 // FIXME: Exclude array klasses for now | |
| 240 // Universe::basic_type_classes_do(&add_loaded_class); | |
| 241 } |