Fri, 11 Feb 2011 14:15:16 +0100
7018257: jmm_DumpThreads allocates into permgen
Summary: Don't allocate in permgen
Reviewed-by: ysr, sla
duke@435 | 1 | /* |
stefank@2314 | 2 | * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
stefank@2314 | 25 | #include "precompiled.hpp" |
stefank@2314 | 26 | #include "classfile/systemDictionary.hpp" |
stefank@2314 | 27 | #include "memory/allocation.hpp" |
stefank@2314 | 28 | #include "memory/universe.hpp" |
stefank@2314 | 29 | #include "oops/oop.inline.hpp" |
stefank@2314 | 30 | #include "runtime/mutexLocker.hpp" |
stefank@2314 | 31 | #include "services/classLoadingService.hpp" |
stefank@2314 | 32 | #include "services/memoryService.hpp" |
stefank@2314 | 33 | #include "utilities/dtrace.hpp" |
duke@435 | 34 | |
duke@435 | 35 | #ifdef DTRACE_ENABLED |
duke@435 | 36 | |
duke@435 | 37 | // Only bother with this argument setup if dtrace is available |
duke@435 | 38 | |
duke@435 | 39 | HS_DTRACE_PROBE_DECL4(hotspot, class__loaded, char*, int, oop, bool); |
duke@435 | 40 | HS_DTRACE_PROBE_DECL4(hotspot, class__unloaded, char*, int, oop, bool); |
duke@435 | 41 | |
duke@435 | 42 | #define DTRACE_CLASSLOAD_PROBE(type, clss, shared) \ |
duke@435 | 43 | { \ |
duke@435 | 44 | char* data = NULL; \ |
duke@435 | 45 | int len = 0; \ |
coleenp@2497 | 46 | Symbol* name = (clss)->name(); \ |
duke@435 | 47 | if (name != NULL) { \ |
duke@435 | 48 | data = (char*)name->bytes(); \ |
duke@435 | 49 | len = name->utf8_length(); \ |
duke@435 | 50 | } \ |
duke@435 | 51 | HS_DTRACE_PROBE4(hotspot, class__##type, \ |
duke@435 | 52 | data, len, (clss)->class_loader(), (shared)); \ |
duke@435 | 53 | } |
duke@435 | 54 | |
duke@435 | 55 | #else // ndef DTRACE_ENABLED |
duke@435 | 56 | |
duke@435 | 57 | #define DTRACE_CLASSLOAD_PROBE(type, clss, shared) |
duke@435 | 58 | |
duke@435 | 59 | #endif |
duke@435 | 60 | |
duke@435 | 61 | // counters for classes loaded from class files |
duke@435 | 62 | PerfCounter* ClassLoadingService::_classes_loaded_count = NULL; |
duke@435 | 63 | PerfCounter* ClassLoadingService::_classes_unloaded_count = NULL; |
duke@435 | 64 | PerfCounter* ClassLoadingService::_classbytes_loaded = NULL; |
duke@435 | 65 | PerfCounter* ClassLoadingService::_classbytes_unloaded = NULL; |
duke@435 | 66 | |
duke@435 | 67 | // counters for classes loaded from shared archive |
duke@435 | 68 | PerfCounter* ClassLoadingService::_shared_classes_loaded_count = NULL; |
duke@435 | 69 | PerfCounter* ClassLoadingService::_shared_classes_unloaded_count = NULL; |
duke@435 | 70 | PerfCounter* ClassLoadingService::_shared_classbytes_loaded = NULL; |
duke@435 | 71 | PerfCounter* ClassLoadingService::_shared_classbytes_unloaded = NULL; |
duke@435 | 72 | PerfVariable* ClassLoadingService::_class_methods_size = NULL; |
duke@435 | 73 | |
duke@435 | 74 | void ClassLoadingService::init() { |
duke@435 | 75 | EXCEPTION_MARK; |
duke@435 | 76 | |
duke@435 | 77 | // These counters are for java.lang.management API support. |
duke@435 | 78 | // They are created even if -XX:-UsePerfData is set and in |
duke@435 | 79 | // that case, they will be allocated on C heap. |
duke@435 | 80 | _classes_loaded_count = |
duke@435 | 81 | PerfDataManager::create_counter(JAVA_CLS, "loadedClasses", |
duke@435 | 82 | PerfData::U_Events, CHECK); |
duke@435 | 83 | |
duke@435 | 84 | _classes_unloaded_count = |
duke@435 | 85 | PerfDataManager::create_counter(JAVA_CLS, "unloadedClasses", |
duke@435 | 86 | PerfData::U_Events, CHECK); |
duke@435 | 87 | |
duke@435 | 88 | _shared_classes_loaded_count = |
duke@435 | 89 | PerfDataManager::create_counter(JAVA_CLS, "sharedLoadedClasses", |
duke@435 | 90 | PerfData::U_Events, CHECK); |
duke@435 | 91 | |
duke@435 | 92 | _shared_classes_unloaded_count = |
duke@435 | 93 | PerfDataManager::create_counter(JAVA_CLS, "sharedUnloadedClasses", |
duke@435 | 94 | PerfData::U_Events, CHECK); |
duke@435 | 95 | |
duke@435 | 96 | if (UsePerfData) { |
duke@435 | 97 | _classbytes_loaded = |
duke@435 | 98 | PerfDataManager::create_counter(SUN_CLS, "loadedBytes", |
duke@435 | 99 | PerfData::U_Bytes, CHECK); |
duke@435 | 100 | |
duke@435 | 101 | _classbytes_unloaded = |
duke@435 | 102 | PerfDataManager::create_counter(SUN_CLS, "unloadedBytes", |
duke@435 | 103 | PerfData::U_Bytes, CHECK); |
duke@435 | 104 | _shared_classbytes_loaded = |
duke@435 | 105 | PerfDataManager::create_counter(SUN_CLS, "sharedLoadedBytes", |
duke@435 | 106 | PerfData::U_Bytes, CHECK); |
duke@435 | 107 | |
duke@435 | 108 | _shared_classbytes_unloaded = |
duke@435 | 109 | PerfDataManager::create_counter(SUN_CLS, "sharedUnloadedBytes", |
duke@435 | 110 | PerfData::U_Bytes, CHECK); |
duke@435 | 111 | _class_methods_size = |
duke@435 | 112 | PerfDataManager::create_variable(SUN_CLS, "methodBytes", |
duke@435 | 113 | PerfData::U_Bytes, CHECK); |
duke@435 | 114 | } |
duke@435 | 115 | } |
duke@435 | 116 | |
duke@435 | 117 | void ClassLoadingService::notify_class_unloaded(instanceKlass* k) { |
duke@435 | 118 | DTRACE_CLASSLOAD_PROBE(unloaded, k, false); |
duke@435 | 119 | // Classes that can be unloaded must be non-shared |
duke@435 | 120 | _classes_unloaded_count->inc(); |
duke@435 | 121 | |
duke@435 | 122 | if (UsePerfData) { |
duke@435 | 123 | // add the class size |
duke@435 | 124 | size_t size = compute_class_size(k); |
duke@435 | 125 | _classbytes_unloaded->inc(size); |
duke@435 | 126 | |
duke@435 | 127 | // Compute method size & subtract from running total. |
duke@435 | 128 | // We are called during phase 1 of mark sweep, so it's |
duke@435 | 129 | // still ok to iterate through methodOops here. |
duke@435 | 130 | objArrayOop methods = k->methods(); |
duke@435 | 131 | for (int i = 0; i < methods->length(); i++) { |
duke@435 | 132 | _class_methods_size->inc(-methods->obj_at(i)->size()); |
duke@435 | 133 | } |
duke@435 | 134 | } |
duke@435 | 135 | |
duke@435 | 136 | if (TraceClassUnloading) { |
duke@435 | 137 | ResourceMark rm; |
ysr@1582 | 138 | tty->print_cr("[Unloading class %s]", k->external_name()); |
duke@435 | 139 | } |
duke@435 | 140 | } |
duke@435 | 141 | |
duke@435 | 142 | void ClassLoadingService::notify_class_loaded(instanceKlass* k, bool shared_class) { |
duke@435 | 143 | DTRACE_CLASSLOAD_PROBE(loaded, k, shared_class); |
duke@435 | 144 | PerfCounter* classes_counter = (shared_class ? _shared_classes_loaded_count |
duke@435 | 145 | : _classes_loaded_count); |
duke@435 | 146 | // increment the count |
duke@435 | 147 | classes_counter->inc(); |
duke@435 | 148 | |
duke@435 | 149 | if (UsePerfData) { |
duke@435 | 150 | PerfCounter* classbytes_counter = (shared_class ? _shared_classbytes_loaded |
duke@435 | 151 | : _classbytes_loaded); |
duke@435 | 152 | // add the class size |
duke@435 | 153 | size_t size = compute_class_size(k); |
duke@435 | 154 | classbytes_counter->inc(size); |
duke@435 | 155 | } |
duke@435 | 156 | } |
duke@435 | 157 | |
duke@435 | 158 | size_t ClassLoadingService::compute_class_size(instanceKlass* k) { |
duke@435 | 159 | // lifted from ClassStatistics.do_class(klassOop k) |
duke@435 | 160 | |
duke@435 | 161 | size_t class_size = 0; |
duke@435 | 162 | |
duke@435 | 163 | class_size += k->as_klassOop()->size(); |
duke@435 | 164 | |
duke@435 | 165 | if (k->oop_is_instance()) { |
duke@435 | 166 | class_size += k->methods()->size(); |
duke@435 | 167 | class_size += k->constants()->size(); |
duke@435 | 168 | class_size += k->local_interfaces()->size(); |
duke@435 | 169 | class_size += k->transitive_interfaces()->size(); |
duke@435 | 170 | // We do not have to count implementors, since we only store one! |
duke@435 | 171 | class_size += k->fields()->size(); |
duke@435 | 172 | } |
duke@435 | 173 | return class_size * oopSize; |
duke@435 | 174 | } |
duke@435 | 175 | |
duke@435 | 176 | |
duke@435 | 177 | bool ClassLoadingService::set_verbose(bool verbose) { |
duke@435 | 178 | MutexLocker m(Management_lock); |
duke@435 | 179 | |
duke@435 | 180 | // verbose will be set to the previous value |
duke@435 | 181 | bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassLoading", &verbose, MANAGEMENT); |
duke@435 | 182 | assert(succeed, "Setting TraceClassLoading flag fails"); |
duke@435 | 183 | reset_trace_class_unloading(); |
duke@435 | 184 | |
duke@435 | 185 | return verbose; |
duke@435 | 186 | } |
duke@435 | 187 | |
duke@435 | 188 | // Caller to this function must own Management_lock |
duke@435 | 189 | void ClassLoadingService::reset_trace_class_unloading() { |
duke@435 | 190 | assert(Management_lock->owned_by_self(), "Must own the Management_lock"); |
duke@435 | 191 | bool value = MemoryService::get_verbose() || ClassLoadingService::get_verbose(); |
duke@435 | 192 | bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassUnloading", &value, MANAGEMENT); |
duke@435 | 193 | assert(succeed, "Setting TraceClassUnLoading flag fails"); |
duke@435 | 194 | } |
duke@435 | 195 | |
duke@435 | 196 | GrowableArray<KlassHandle>* LoadedClassesEnumerator::_loaded_classes = NULL; |
duke@435 | 197 | Thread* LoadedClassesEnumerator::_current_thread = NULL; |
duke@435 | 198 | |
duke@435 | 199 | LoadedClassesEnumerator::LoadedClassesEnumerator(Thread* cur_thread) { |
duke@435 | 200 | assert(cur_thread == Thread::current(), "Check current thread"); |
duke@435 | 201 | |
duke@435 | 202 | int init_size = ClassLoadingService::loaded_class_count(); |
duke@435 | 203 | _klass_handle_array = new GrowableArray<KlassHandle>(init_size); |
duke@435 | 204 | |
duke@435 | 205 | // For consistency of the loaded classes, grab the SystemDictionary lock |
duke@435 | 206 | MutexLocker sd_mutex(SystemDictionary_lock); |
duke@435 | 207 | |
duke@435 | 208 | // Set _loaded_classes and _current_thread and begin enumerating all classes. |
duke@435 | 209 | // Only one thread will do the enumeration at a time. |
duke@435 | 210 | // These static variables are needed and they are used by the static method |
duke@435 | 211 | // add_loaded_class called from classes_do(). |
duke@435 | 212 | _loaded_classes = _klass_handle_array; |
duke@435 | 213 | _current_thread = cur_thread; |
duke@435 | 214 | |
duke@435 | 215 | SystemDictionary::classes_do(&add_loaded_class); |
duke@435 | 216 | |
duke@435 | 217 | // FIXME: Exclude array klasses for now |
duke@435 | 218 | // Universe::basic_type_classes_do(&add_loaded_class); |
duke@435 | 219 | } |