Mercurial > hg > graal-compiler
view src/share/vm/runtime/statSampler.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) 2001, 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 "classfile/vmSymbols.hpp" #include "memory/allocation.inline.hpp" #include "memory/resourceArea.hpp" #include "oops/oop.inline.hpp" #include "runtime/arguments.hpp" #include "runtime/java.hpp" #include "runtime/javaCalls.hpp" #include "runtime/os.hpp" #include "runtime/statSampler.hpp" #ifdef TARGET_ARCH_x86 # include "vm_version_x86.hpp" #endif #ifdef TARGET_ARCH_sparc # include "vm_version_sparc.hpp" #endif #ifdef TARGET_ARCH_zero # include "vm_version_zero.hpp" #endif // -------------------------------------------------------- // StatSamplerTask class StatSamplerTask : public PeriodicTask { public: StatSamplerTask(int interval_time) : PeriodicTask(interval_time) {} void task() { StatSampler::collect_sample(); } }; //---------------------------------------------------------- // Implementation of StatSampler StatSamplerTask* StatSampler::_task = NULL; PerfDataList* StatSampler::_sampled = NULL; /* * the initialize method is called from the engage() method * and is responsible for initializing various global variables. */ void StatSampler::initialize() { if (!UsePerfData) return; // create performance data that could not be created prior // to vm_init_globals() or otherwise have no logical home. create_misc_perfdata(); // get copy of the sampled list _sampled = PerfDataManager::sampled(); } /* * The engage() method is called at initialization time via * Thread::create_vm() to initialize the StatSampler and * register it with the WatcherThread as a periodic task. */ void StatSampler::engage() { if (!UsePerfData) return; if (!is_active()) { initialize(); // start up the periodic task _task = new StatSamplerTask(PerfDataSamplingInterval); _task->enroll(); } } /* * the disengage() method is responsible for deactivating the periodic * task and, if logging was enabled, for logging the final sample. This * method is called from before_exit() in java.cpp and is only called * after the WatcherThread has been stopped. */ void StatSampler::disengage() { if (!UsePerfData) return; if (!is_active()) return; // remove StatSamplerTask _task->disenroll(); delete _task; _task = NULL; // force a final sample sample_data(_sampled); } /* * the destroy method is responsible for releasing any resources used by * the StatSampler prior to shutdown of the VM. this method is called from * before_exit() in java.cpp and is only called after the WatcherThread * has stopped. */ void StatSampler::destroy() { if (!UsePerfData) return; if (_sampled != NULL) { delete(_sampled); _sampled = NULL; } } /* * The sample_data() method is responsible for sampling the * the data value for each PerfData instance in the given list. */ void StatSampler::sample_data(PerfDataList* list) { assert(list != NULL, "null list unexpected"); for (int index = 0; index < list->length(); index++) { PerfData* item = list->at(index); item->sample(); } } /* * the collect_sample() method is the method invoked by the * WatcherThread via the PeriodicTask::task() method. This method * is responsible for collecting data samples from sampled * PerfData instances every PerfDataSamplingInterval milliseconds. * It is also responsible for logging the requested set of * PerfData instances every _sample_count milliseconds. While * logging data, it will output a column header after every _print_header * rows of data have been logged. */ void StatSampler::collect_sample() { // future - check for new PerfData objects. PerfData objects might // get added to the PerfDataManager lists after we have already // built our local copies. // // if (PerfDataManager::count() > previous) { // // get a new copy of the sampled list // if (_sampled != NULL) { // delete(_sampled); // _sampled = NULL; // } // _sampled = PerfDataManager::sampled(); // } assert(_sampled != NULL, "list not initialized"); sample_data(_sampled); } /* * method to upcall into Java to return the value of the specified * property as a utf8 string, or NULL if does not exist. The caller * is responsible for setting a ResourceMark for proper cleanup of * the utf8 strings. */ const char* StatSampler::get_system_property(const char* name, TRAPS) { // setup the arguments to getProperty Handle key_str = java_lang_String::create_from_str(name, CHECK_NULL); // return value JavaValue result(T_OBJECT); // public static String getProperty(String key, String def); JavaCalls::call_static(&result, KlassHandle(THREAD, SystemDictionary::System_klass()), vmSymbolHandles::getProperty_name(), vmSymbolHandles::string_string_signature(), key_str, CHECK_NULL); oop value_oop = (oop)result.get_jobject(); if (value_oop == NULL) { return NULL; } // convert Java String to utf8 string char* value = java_lang_String::as_utf8_string(value_oop); return value; } /* * The list of System Properties that have corresponding PerfData * string instrumentation created by retrieving the named property's * value from System.getProperty() and unconditionally creating a * PerfStringConstant object initialized to the retreived value. This * is not an exhustive list of Java properties with corresponding string * instrumentation as the create_system_property_instrumentation() method * creates other property based instrumentation conditionally. */ // stable interface, supported counters static const char* property_counters_ss[] = { "java.vm.specification.version", "java.vm.specification.name", "java.vm.specification.vendor", "java.vm.version", "java.vm.name", "java.vm.vendor", "java.vm.info", "java.library.path", "java.class.path", "java.endorsed.dirs", "java.ext.dirs", "java.version", "java.home", NULL }; // unstable interface, supported counters static const char* property_counters_us[] = { NULL }; // unstable interface, unsupported counters static const char* property_counters_uu[] = { "sun.boot.class.path", "sun.boot.library.path", NULL }; typedef struct { const char** property_list; CounterNS name_space; } PropertyCounters; static PropertyCounters property_counters[] = { { property_counters_ss, JAVA_PROPERTY }, { property_counters_us, COM_PROPERTY }, { property_counters_uu, SUN_PROPERTY }, { NULL, SUN_PROPERTY } }; /* * Method to create PerfData string instruments that contain the values * of various system properties. String instruments are created for each * property specified in the property lists provided in property_counters[]. * Property counters have a counter name space prefix prepended to the * property name as indicated in property_counters[]. */ void StatSampler::create_system_property_instrumentation(TRAPS) { ResourceMark rm; for (int i = 0; property_counters[i].property_list != NULL; i++) { for (int j = 0; property_counters[i].property_list[j] != NULL; j++) { const char* property_name = property_counters[i].property_list[j]; assert(property_name != NULL, "property name should not be NULL"); const char* value = get_system_property(property_name, CHECK); // the property must exist assert(value != NULL, "property name should be valid"); if (value != NULL) { // create the property counter PerfDataManager::create_string_constant(property_counters[i].name_space, property_name, value, CHECK); } } } } /* * The create_misc_perfdata() method provides a place to create * PerfData instances that would otherwise have no better place * to exist. */ void StatSampler::create_misc_perfdata() { ResourceMark rm; EXCEPTION_MARK; // numeric constants // frequency of the native high resolution timer PerfDataManager::create_constant(SUN_OS, "hrt.frequency", PerfData::U_Hertz, os::elapsed_frequency(), CHECK); // string constants // create string instrumentation for various Java properties. create_system_property_instrumentation(CHECK); // hotspot flags (from .hotspotrc) and args (from command line) // PerfDataManager::create_string_constant(JAVA_RT, "vmFlags", Arguments::jvm_flags(), CHECK); PerfDataManager::create_string_constant(JAVA_RT, "vmArgs", Arguments::jvm_args(), CHECK); // java class name/jar file and arguments to main class // note: name is cooridnated with launcher and Arguments.cpp PerfDataManager::create_string_constant(SUN_RT, "javaCommand", Arguments::java_command(), CHECK); // the Java VM Internal version string PerfDataManager::create_string_constant(SUN_RT, "internalVersion", VM_Version::internal_vm_info_string(), CHECK); // create sampled instrumentation objects create_sampled_perfdata(); } /* * helper class to provide for sampling of the elapsed_counter value * maintained in the OS class. */ class HighResTimeSampler : public PerfSampleHelper { public: jlong take_sample() { return os::elapsed_counter(); } }; /* * the create_sampled_perdata() method provides a place to instantiate * sampled PerfData instances that would otherwise have no better place * to exist. */ void StatSampler::create_sampled_perfdata() { EXCEPTION_MARK; // setup sampling of the elapsed time counter maintained in the // the os class. This counter can be used as either a time stamp // for each logged entry or as a liveness indicator for the VM. PerfSampleHelper* psh = new HighResTimeSampler(); PerfDataManager::create_counter(SUN_OS, "hrt.ticks", PerfData::U_Ticks, psh, CHECK); } /* * the statSampler_exit() function is called from os_init.cpp on * exit of the vm. */ void statSampler_exit() { if (!UsePerfData) return; StatSampler::destroy(); }