Quelle classLoadingService.cpp Sprache: C

/*
* Copyright (c) 2003, 2021, 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 "memory/allocation.hpp"
#include "memory/resourceArea.hpp"
#include "oops/oop.inline.hpp"
#include "oops/instanceKlass.hpp"
#include "oops/method.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_data(), (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);
  }
}

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));
}

jlong ClassLoadingService::loaded_class_count() {
  return _classes_loaded_count->get_value() + _shared_classes_loaded_count->get_value();
}

jlong ClassLoadingService::unloaded_class_count() {
  return _classes_unloaded_count->get_value() + _shared_classes_unloaded_count->get_value();
}

jlong ClassLoadingService::loaded_class_bytes() {
  return UsePerfData ? _classbytes_loaded->get_value() + _shared_classbytes_loaded->get_value() : -1;
}

jlong ClassLoadingService::unloaded_class_bytes() {
  return UsePerfData ? _classbytes_unloaded->get_value() + _shared_classbytes_unloaded->get_value() : -1;
}

jlong ClassLoadingService::loaded_shared_class_count() {
  return _shared_classes_loaded_count->get_value();
}

jlong ClassLoadingService::unloaded_shared_class_count() {
  return _shared_classes_unloaded_count->get_value();
}

jlong ClassLoadingService::loaded_shared_class_bytes() {
  return UsePerfData ? _shared_classbytes_loaded->get_value() : -1;
}

jlong ClassLoadingService::unloaded_shared_class_bytes() {
  return UsePerfData ? _shared_classbytes_unloaded->get_value() : -1;
}

jlong ClassLoadingService::class_method_data_size() {
  return UsePerfData ? _class_methods_size->get_value() : -1;
}

static size_t compute_class_size(InstanceKlass* k) {
  // lifted from ClassStatistics.do_class(Klass* k)
  size_t 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();
    if (k->transitive_interfaces() != NULL) {
      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;
}

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);
  }
}

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());
    }
  }
}

#endif // INCLUDE_MANAGEMENT

quality95%

¤ Dauer der Verarbeitung: 0.15 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.