diff -r 4ebc2e2fb97c -r 71c04702a3d5 src/hotspot/share/services/classLoadingService.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/hotspot/share/services/classLoadingService.cpp Tue Sep 12 19:03:39 2017 +0200 @@ -0,0 +1,200 @@ +/* + * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +#include "precompiled.hpp" +#include "classfile/systemDictionary.hpp" +#include "memory/allocation.hpp" +#include "memory/resourceArea.hpp" +#include "memory/universe.hpp" +#include "oops/oop.inline.hpp" +#include "runtime/mutexLocker.hpp" +#include "services/classLoadingService.hpp" +#include "services/memoryService.hpp" +#include "utilities/dtrace.hpp" +#include "utilities/macros.hpp" +#include "utilities/defaultStream.hpp" +#include "logging/log.hpp" +#include "logging/logConfiguration.hpp" + +#ifdef DTRACE_ENABLED + +// Only bother with this argument setup if dtrace is available + +#define HOTSPOT_CLASS_unloaded HOTSPOT_CLASS_UNLOADED +#define HOTSPOT_CLASS_loaded HOTSPOT_CLASS_LOADED +#define DTRACE_CLASSLOAD_PROBE(type, clss, shared) \ + { \ + char* data = NULL; \ + int len = 0; \ + Symbol* name = (clss)->name(); \ + if (name != NULL) { \ + data = (char*)name->bytes(); \ + len = name->utf8_length(); \ + } \ + HOTSPOT_CLASS_##type( /* type = unloaded, loaded */ \ + data, len, (void*)(clss)->class_loader(), (shared)); \ + } + +#else // ndef DTRACE_ENABLED + +#define DTRACE_CLASSLOAD_PROBE(type, clss, shared) + +#endif + +#if INCLUDE_MANAGEMENT +// counters for classes loaded from class files +PerfCounter* ClassLoadingService::_classes_loaded_count = NULL; +PerfCounter* ClassLoadingService::_classes_unloaded_count = NULL; +PerfCounter* ClassLoadingService::_classbytes_loaded = NULL; +PerfCounter* ClassLoadingService::_classbytes_unloaded = NULL; + +// counters for classes loaded from shared archive +PerfCounter* ClassLoadingService::_shared_classes_loaded_count = NULL; +PerfCounter* ClassLoadingService::_shared_classes_unloaded_count = NULL; +PerfCounter* ClassLoadingService::_shared_classbytes_loaded = NULL; +PerfCounter* ClassLoadingService::_shared_classbytes_unloaded = NULL; +PerfVariable* ClassLoadingService::_class_methods_size = NULL; + +void ClassLoadingService::init() { + EXCEPTION_MARK; + + // These counters are for java.lang.management API support. + // They are created even if -XX:-UsePerfData is set and in + // that case, they will be allocated on C heap. + _classes_loaded_count = + PerfDataManager::create_counter(JAVA_CLS, "loadedClasses", + PerfData::U_Events, CHECK); + + _classes_unloaded_count = + PerfDataManager::create_counter(JAVA_CLS, "unloadedClasses", + PerfData::U_Events, CHECK); + + _shared_classes_loaded_count = + PerfDataManager::create_counter(JAVA_CLS, "sharedLoadedClasses", + PerfData::U_Events, CHECK); + + _shared_classes_unloaded_count = + PerfDataManager::create_counter(JAVA_CLS, "sharedUnloadedClasses", + PerfData::U_Events, CHECK); + + if (UsePerfData) { + _classbytes_loaded = + PerfDataManager::create_counter(SUN_CLS, "loadedBytes", + PerfData::U_Bytes, CHECK); + + _classbytes_unloaded = + PerfDataManager::create_counter(SUN_CLS, "unloadedBytes", + PerfData::U_Bytes, CHECK); + _shared_classbytes_loaded = + PerfDataManager::create_counter(SUN_CLS, "sharedLoadedBytes", + PerfData::U_Bytes, CHECK); + + _shared_classbytes_unloaded = + PerfDataManager::create_counter(SUN_CLS, "sharedUnloadedBytes", + PerfData::U_Bytes, CHECK); + _class_methods_size = + PerfDataManager::create_variable(SUN_CLS, "methodBytes", + PerfData::U_Bytes, CHECK); + } +} + +void ClassLoadingService::notify_class_unloaded(InstanceKlass* k) { + DTRACE_CLASSLOAD_PROBE(unloaded, k, false); + // Classes that can be unloaded must be non-shared + _classes_unloaded_count->inc(); + + if (UsePerfData) { + // add the class size + size_t size = compute_class_size(k); + _classbytes_unloaded->inc(size); + + // Compute method size & subtract from running total. + // We are called during phase 1 of mark sweep, so it's + // still ok to iterate through Method*s here. + Array* methods = k->methods(); + for (int i = 0; i < methods->length(); i++) { + _class_methods_size->inc(-methods->at(i)->size()); + } + } + + if (log_is_enabled(Info, class, unload)) { + ResourceMark rm; + log_info(class, unload)("unloading class %s " INTPTR_FORMAT , k->external_name(), p2i(k)); + } +} + +void ClassLoadingService::notify_class_loaded(InstanceKlass* k, bool shared_class) { + DTRACE_CLASSLOAD_PROBE(loaded, k, shared_class); + PerfCounter* classes_counter = (shared_class ? _shared_classes_loaded_count + : _classes_loaded_count); + // increment the count + classes_counter->inc(); + + if (UsePerfData) { + PerfCounter* classbytes_counter = (shared_class ? _shared_classbytes_loaded + : _classbytes_loaded); + // add the class size + size_t size = compute_class_size(k); + classbytes_counter->inc(size); + } +} + +size_t ClassLoadingService::compute_class_size(InstanceKlass* k) { + // lifted from ClassStatistics.do_class(Klass* k) + + size_t class_size = 0; + + class_size += k->size(); + + if (k->is_instance_klass()) { + class_size += k->methods()->size(); + // FIXME: Need to count the contents of methods + class_size += k->constants()->size(); + class_size += k->local_interfaces()->size(); + class_size += k->transitive_interfaces()->size(); + // We do not have to count implementors, since we only store one! + // FIXME: How should these be accounted for, now when they have moved. + //class_size += k->fields()->size(); + } + return class_size * oopSize; +} + +bool ClassLoadingService::set_verbose(bool verbose) { + MutexLocker m(Management_lock); + // verbose will be set to the previous value + LogLevelType level = verbose ? LogLevel::Info : LogLevel::Off; + LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, load)); + reset_trace_class_unloading(); + return verbose; +} + +// Caller to this function must own Management_lock +void ClassLoadingService::reset_trace_class_unloading() { + assert(Management_lock->owned_by_self(), "Must own the Management_lock"); + bool value = MemoryService::get_verbose() || ClassLoadingService::get_verbose(); + LogLevelType level = value ? LogLevel::Info : LogLevel::Off; + LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, unload)); +} + +#endif // INCLUDE_MANAGEMENT