--- /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<Method*>* 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