view src/share/vm/services/management.hpp @ 3602:da91efe96a93

6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <>, stefank <>, mgerdin <>, never <>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents 2e0ef19fc891
children fb19af007ffc
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 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
 * 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 if you need additional information or have any
 * questions.


#include "memory/allocation.hpp"
#include "runtime/handles.hpp"
#include "runtime/timer.hpp"
#include "services/jmm.h"

class OopClosure;
class ThreadSnapshot;

class Management : public AllStatic {
  static PerfVariable*      _begin_vm_creation_time;
  static PerfVariable*      _end_vm_creation_time;
  static PerfVariable*      _vm_init_done_time;
  static jmmOptionalSupport _optional_support;
  static TimeStamp          _stamp; // Timestamp since vm init done time

  // Management klasses
  static Klass*             _sensor_klass;
  static Klass*             _threadInfo_klass;
  static Klass*             _memoryUsage_klass;
  static Klass*             _memoryPoolMXBean_klass;
  static Klass*             _memoryManagerMXBean_klass;
  static Klass*             _garbageCollectorMXBean_klass;
  static Klass*             _managementFactory_klass;
  static Klass*             _garbageCollectorImpl_klass;
  static Klass*             _gcInfo_klass;

  static Klass* load_and_initialize_klass(Symbol* sh, TRAPS);

  static void init();
  static void initialize(TRAPS);

  static jlong ticks_to_ms(jlong ticks);
  static jlong timestamp();

  static void  oops_do(OopClosure* f);
  static void* get_jmm_interface(int version);
  static void  get_optional_support(jmmOptionalSupport* support);

  static void get_loaded_classes(JavaThread* cur_thread, GrowableArray<KlassHandle>* klass_handle_array);

  static void  record_vm_startup_time(jlong begin, jlong duration);
  static void  record_vm_init_completed() {
    // Initialize the timestamp to get the current time

    // Update the timestamp to the vm init done time

  static jlong begin_vm_creation_time() {
    return _begin_vm_creation_time->get_value();
  static jlong vm_init_done_time() {
    return _vm_init_done_time->get_value();

  // methods to return a Klass*.
  static Klass* java_lang_management_ThreadInfo_klass(TRAPS);
  static Klass* java_lang_management_MemoryUsage_klass(TRAPS);
  static Klass* java_lang_management_MemoryPoolMXBean_klass(TRAPS);
  static Klass* java_lang_management_MemoryManagerMXBean_klass(TRAPS);
  static Klass* java_lang_management_GarbageCollectorMXBean_klass(TRAPS);
  static Klass* sun_management_Sensor_klass(TRAPS);
  static Klass* sun_management_ManagementFactory_klass(TRAPS);
  static Klass* sun_management_GarbageCollectorImpl_klass(TRAPS);
  static Klass* com_sun_management_GcInfo_klass(TRAPS);

  static instanceOop create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS);
  static instanceOop create_thread_info_instance(ThreadSnapshot* snapshot, objArrayHandle monitors_array, typeArrayHandle depths_array, objArrayHandle synchronizers_array, TRAPS);

class TraceVmCreationTime : public StackObj {
  TimeStamp _timer;
  jlong     _begin_time;

  TraceVmCreationTime() {}
  ~TraceVmCreationTime() {}

  void start()
  { _timer.update_to(0); _begin_time = os::javaTimeMillis(); }

   * Only call this if initialization completes successfully; it will
   * crash if PerfMemory_exit() has already been called (usually by
   * os::shutdown() when there was an initialization failure).
  void end()
  { Management::record_vm_startup_time(_begin_time, _timer.milliseconds()); }