author | sla |
Tue, 18 Feb 2014 09:15:40 +0100 | |
changeset 22796 | bb0ea482a99e |
parent 20300 | fe4818444117 |
child 24424 | 2658d7834c6e |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "classfile/systemDictionary.hpp" |
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#include "memory/allocation.hpp" |
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#include "memory/universe.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/mutexLocker.hpp" |
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#include "services/classLoadingService.hpp" |
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#include "services/memoryService.hpp" |
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#include "utilities/dtrace.hpp" |
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#include "utilities/macros.hpp" |
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#ifdef DTRACE_ENABLED |
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// Only bother with this argument setup if dtrace is available |
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#define HOTSPOT_CLASS_unloaded HOTSPOT_CLASS_UNLOADED |
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#define HOTSPOT_CLASS_loaded HOTSPOT_CLASS_LOADED |
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#define DTRACE_CLASSLOAD_PROBE(type, clss, shared) \ |
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{ \ |
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char* data = NULL; \ |
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int len = 0; \ |
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Symbol* name = (clss)->name(); \ |
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if (name != NULL) { \ |
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data = (char*)name->bytes(); \ |
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len = name->utf8_length(); \ |
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} \ |
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HOTSPOT_CLASS_##type( /* type = unloaded, loaded */ \ |
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data, len, (clss)->class_loader(), (shared)); \ |
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} |
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#else // ndef DTRACE_ENABLED |
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#define DTRACE_CLASSLOAD_PROBE(type, clss, shared) |
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#endif |
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#if INCLUDE_MANAGEMENT |
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// counters for classes loaded from class files |
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PerfCounter* ClassLoadingService::_classes_loaded_count = NULL; |
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PerfCounter* ClassLoadingService::_classes_unloaded_count = NULL; |
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PerfCounter* ClassLoadingService::_classbytes_loaded = NULL; |
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PerfCounter* ClassLoadingService::_classbytes_unloaded = NULL; |
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// counters for classes loaded from shared archive |
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PerfCounter* ClassLoadingService::_shared_classes_loaded_count = NULL; |
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PerfCounter* ClassLoadingService::_shared_classes_unloaded_count = NULL; |
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PerfCounter* ClassLoadingService::_shared_classbytes_loaded = NULL; |
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PerfCounter* ClassLoadingService::_shared_classbytes_unloaded = NULL; |
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PerfVariable* ClassLoadingService::_class_methods_size = NULL; |
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void ClassLoadingService::init() { |
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EXCEPTION_MARK; |
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// These counters are for java.lang.management API support. |
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// They are created even if -XX:-UsePerfData is set and in |
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// that case, they will be allocated on C heap. |
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_classes_loaded_count = |
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PerfDataManager::create_counter(JAVA_CLS, "loadedClasses", |
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PerfData::U_Events, CHECK); |
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_classes_unloaded_count = |
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PerfDataManager::create_counter(JAVA_CLS, "unloadedClasses", |
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PerfData::U_Events, CHECK); |
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_shared_classes_loaded_count = |
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PerfDataManager::create_counter(JAVA_CLS, "sharedLoadedClasses", |
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PerfData::U_Events, CHECK); |
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_shared_classes_unloaded_count = |
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PerfDataManager::create_counter(JAVA_CLS, "sharedUnloadedClasses", |
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PerfData::U_Events, CHECK); |
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if (UsePerfData) { |
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_classbytes_loaded = |
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PerfDataManager::create_counter(SUN_CLS, "loadedBytes", |
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PerfData::U_Bytes, CHECK); |
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_classbytes_unloaded = |
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PerfDataManager::create_counter(SUN_CLS, "unloadedBytes", |
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PerfData::U_Bytes, CHECK); |
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_shared_classbytes_loaded = |
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PerfDataManager::create_counter(SUN_CLS, "sharedLoadedBytes", |
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PerfData::U_Bytes, CHECK); |
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_shared_classbytes_unloaded = |
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PerfDataManager::create_counter(SUN_CLS, "sharedUnloadedBytes", |
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PerfData::U_Bytes, CHECK); |
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_class_methods_size = |
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PerfDataManager::create_variable(SUN_CLS, "methodBytes", |
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PerfData::U_Bytes, CHECK); |
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} |
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} |
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void ClassLoadingService::notify_class_unloaded(InstanceKlass* k) { |
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DTRACE_CLASSLOAD_PROBE(unloaded, k, false); |
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// Classes that can be unloaded must be non-shared |
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_classes_unloaded_count->inc(); |
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if (UsePerfData) { |
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// add the class size |
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size_t size = compute_class_size(k); |
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_classbytes_unloaded->inc(size); |
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// Compute method size & subtract from running total. |
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// We are called during phase 1 of mark sweep, so it's |
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// still ok to iterate through Method*s here. |
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Array<Method*>* methods = k->methods(); |
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for (int i = 0; i < methods->length(); i++) { |
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_class_methods_size->inc(-methods->at(i)->size()); |
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} |
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} |
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if (TraceClassUnloading) { |
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ResourceMark rm; |
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tty->print_cr("[Unloading class %s " INTPTR_FORMAT "]", k->external_name(), k); |
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} |
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} |
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void ClassLoadingService::notify_class_loaded(InstanceKlass* k, bool shared_class) { |
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DTRACE_CLASSLOAD_PROBE(loaded, k, shared_class); |
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PerfCounter* classes_counter = (shared_class ? _shared_classes_loaded_count |
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: _classes_loaded_count); |
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// increment the count |
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classes_counter->inc(); |
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if (UsePerfData) { |
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PerfCounter* classbytes_counter = (shared_class ? _shared_classbytes_loaded |
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: _classbytes_loaded); |
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// add the class size |
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size_t size = compute_class_size(k); |
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classbytes_counter->inc(size); |
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} |
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} |
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size_t ClassLoadingService::compute_class_size(InstanceKlass* k) { |
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// lifted from ClassStatistics.do_class(Klass* k) |
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size_t class_size = 0; |
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class_size += k->size(); |
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if (k->oop_is_instance()) { |
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class_size += k->methods()->size(); |
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// FIXME: Need to count the contents of methods |
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class_size += k->constants()->size(); |
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class_size += k->local_interfaces()->size(); |
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class_size += k->transitive_interfaces()->size(); |
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// We do not have to count implementors, since we only store one! |
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// FIXME: How should these be accounted for, now when they have moved. |
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//class_size += k->fields()->size(); |
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} |
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return class_size * oopSize; |
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} |
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bool ClassLoadingService::set_verbose(bool verbose) { |
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MutexLocker m(Management_lock); |
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// verbose will be set to the previous value |
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bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassLoading", &verbose, Flag::MANAGEMENT); |
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assert(succeed, "Setting TraceClassLoading flag fails"); |
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reset_trace_class_unloading(); |
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return verbose; |
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} |
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// Caller to this function must own Management_lock |
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void ClassLoadingService::reset_trace_class_unloading() { |
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assert(Management_lock->owned_by_self(), "Must own the Management_lock"); |
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bool value = MemoryService::get_verbose() || ClassLoadingService::get_verbose(); |
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bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassUnloading", &value, Flag::MANAGEMENT); |
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assert(succeed, "Setting TraceClassUnLoading flag fails"); |
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} |
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GrowableArray<KlassHandle>* LoadedClassesEnumerator::_loaded_classes = NULL; |
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Thread* LoadedClassesEnumerator::_current_thread = NULL; |
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LoadedClassesEnumerator::LoadedClassesEnumerator(Thread* cur_thread) { |
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assert(cur_thread == Thread::current(), "Check current thread"); |
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int init_size = ClassLoadingService::loaded_class_count(); |
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_klass_handle_array = new GrowableArray<KlassHandle>(init_size); |
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// For consistency of the loaded classes, grab the SystemDictionary lock |
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MutexLocker sd_mutex(SystemDictionary_lock); |
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// Set _loaded_classes and _current_thread and begin enumerating all classes. |
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// Only one thread will do the enumeration at a time. |
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// These static variables are needed and they are used by the static method |
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// add_loaded_class called from classes_do(). |
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_loaded_classes = _klass_handle_array; |
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_current_thread = cur_thread; |
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SystemDictionary::classes_do(&add_loaded_class); |
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// FIXME: Exclude array klasses for now |
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// Universe::basic_type_classes_do(&add_loaded_class); |
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} |
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#endif // INCLUDE_MANAGEMENT |