Mercurial > hg > graal-compiler
view src/share/vm/services/classLoadingService.cpp @ 2149:7e37af9d69ef
7011379: G1: overly long concurrent marking cycles
Summary: This changeset introduces filtering of SATB buffers at the point when they are about to be enqueued. If this filtering clears enough entries on each buffer, the buffer can then be re-used and not enqueued. This cuts down the number of SATB buffers that need to be processed by the concurrent marking threads.
Reviewed-by: johnc, ysr
author | tonyp |
---|---|
date | Wed, 19 Jan 2011 09:35:17 -0500 |
parents | f95d63e2154a |
children | 3582bf76420e |
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/* * Copyright (c) 2003, 2010, 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/universe.hpp" #include "oops/oop.inline.hpp" #include "runtime/mutexLocker.hpp" #include "services/classLoadingService.hpp" #include "services/memoryService.hpp" #include "utilities/dtrace.hpp" #ifdef DTRACE_ENABLED // Only bother with this argument setup if dtrace is available HS_DTRACE_PROBE_DECL4(hotspot, class__loaded, char*, int, oop, bool); HS_DTRACE_PROBE_DECL4(hotspot, class__unloaded, char*, int, oop, bool); #define DTRACE_CLASSLOAD_PROBE(type, clss, shared) \ { \ char* data = NULL; \ int len = 0; \ symbolOop name = (clss)->name(); \ if (name != NULL) { \ data = (char*)name->bytes(); \ len = name->utf8_length(); \ } \ HS_DTRACE_PROBE4(hotspot, class__##type, \ data, len, (clss)->class_loader(), (shared)); \ } #else // ndef DTRACE_ENABLED #define DTRACE_CLASSLOAD_PROBE(type, clss, shared) #endif // 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 methodOops here. objArrayOop methods = k->methods(); for (int i = 0; i < methods->length(); i++) { _class_methods_size->inc(-methods->obj_at(i)->size()); } } if (TraceClassUnloading) { ResourceMark rm; tty->print_cr("[Unloading class %s]", k->external_name()); } } 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(klassOop k) size_t class_size = 0; class_size += k->as_klassOop()->size(); if (k->oop_is_instance()) { class_size += k->methods()->size(); 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! 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 bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassLoading", &verbose, MANAGEMENT); assert(succeed, "Setting TraceClassLoading flag fails"); 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(); bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassUnloading", &value, MANAGEMENT); assert(succeed, "Setting TraceClassUnLoading flag fails"); } GrowableArray<KlassHandle>* LoadedClassesEnumerator::_loaded_classes = NULL; Thread* LoadedClassesEnumerator::_current_thread = NULL; LoadedClassesEnumerator::LoadedClassesEnumerator(Thread* cur_thread) { assert(cur_thread == Thread::current(), "Check current thread"); int init_size = ClassLoadingService::loaded_class_count(); _klass_handle_array = new GrowableArray<KlassHandle>(init_size); // For consistency of the loaded classes, grab the SystemDictionary lock MutexLocker sd_mutex(SystemDictionary_lock); // Set _loaded_classes and _current_thread and begin enumerating all classes. // Only one thread will do the enumeration at a time. // These static variables are needed and they are used by the static method // add_loaded_class called from classes_do(). _loaded_classes = _klass_handle_array; _current_thread = cur_thread; SystemDictionary::classes_do(&add_loaded_class); // FIXME: Exclude array klasses for now // Universe::basic_type_classes_do(&add_loaded_class); }