src/hotspot/share/runtime/serviceThread.cpp
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
changeset 47216 71c04702a3d5
parent 46329 hotspot/src/share/vm/runtime/serviceThread.cpp@53ccc37bda19
child 49054 fa4c8865a4ff
permissions -rw-r--r--
8187443: Forest Consolidation: Move files to unified layout Reviewed-by: darcy, ihse
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/*
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 * Copyright (c) 2012, 2017, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "runtime/interfaceSupport.hpp"
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#include "runtime/javaCalls.hpp"
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#include "runtime/serviceThread.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/os.hpp"
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#include "prims/jvmtiImpl.hpp"
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#include "services/allocationContextService.hpp"
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#include "services/diagnosticArgument.hpp"
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#include "services/diagnosticFramework.hpp"
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#include "services/gcNotifier.hpp"
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#include "services/lowMemoryDetector.hpp"
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ServiceThread* ServiceThread::_instance = NULL;
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void ServiceThread::initialize() {
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  EXCEPTION_MARK;
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  InstanceKlass* klass = SystemDictionary::Thread_klass();
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  instanceHandle thread_oop = klass->allocate_instance_handle(CHECK);
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  const char* name = "Service Thread";
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  Handle string = java_lang_String::create_from_str(name, CHECK);
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  // Initialize thread_oop to put it into the system threadGroup
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  Handle thread_group (THREAD, Universe::system_thread_group());
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  JavaValue result(T_VOID);
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  JavaCalls::call_special(&result, thread_oop,
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                          klass,
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                          vmSymbols::object_initializer_name(),
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                          vmSymbols::threadgroup_string_void_signature(),
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                          thread_group,
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                          string,
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                          CHECK);
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  {
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    MutexLocker mu(Threads_lock);
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    ServiceThread* thread =  new ServiceThread(&service_thread_entry);
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    // At this point it may be possible that no osthread was created for the
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    // JavaThread due to lack of memory. We would have to throw an exception
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    // in that case. However, since this must work and we do not allow
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    // exceptions anyway, check and abort if this fails.
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    if (thread == NULL || thread->osthread() == NULL) {
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      vm_exit_during_initialization("java.lang.OutOfMemoryError",
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                                    os::native_thread_creation_failed_msg());
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    }
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    java_lang_Thread::set_thread(thread_oop(), thread);
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    java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
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    java_lang_Thread::set_daemon(thread_oop());
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    thread->set_threadObj(thread_oop());
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    _instance = thread;
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    Threads::add(thread);
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    Thread::start(thread);
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  }
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}
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void ServiceThread::service_thread_entry(JavaThread* jt, TRAPS) {
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  while (true) {
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    bool sensors_changed = false;
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    bool has_jvmti_events = false;
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    bool has_gc_notification_event = false;
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    bool has_dcmd_notification_event = false;
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    bool acs_notify = false;
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    JvmtiDeferredEvent jvmti_event;
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    {
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      // Need state transition ThreadBlockInVM so that this thread
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      // will be handled by safepoint correctly when this thread is
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      // notified at a safepoint.
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      // This ThreadBlockInVM object is not also considered to be
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      // suspend-equivalent because ServiceThread is not visible to
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      // external suspension.
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      ThreadBlockInVM tbivm(jt);
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      MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
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      while (!(sensors_changed = LowMemoryDetector::has_pending_requests()) &&
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             !(has_jvmti_events = JvmtiDeferredEventQueue::has_events()) &&
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              !(has_gc_notification_event = GCNotifier::has_event()) &&
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              !(has_dcmd_notification_event = DCmdFactory::has_pending_jmx_notification()) &&
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             !(acs_notify = AllocationContextService::should_notify())) {
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        // wait until one of the sensors has pending requests, or there is a
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        // pending JVMTI event or JMX GC notification to post
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        Service_lock->wait(Mutex::_no_safepoint_check_flag);
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      }
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      if (has_jvmti_events) {
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        jvmti_event = JvmtiDeferredEventQueue::dequeue();
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      }
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    }
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    if (has_jvmti_events) {
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      jvmti_event.post();
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    }
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    if (sensors_changed) {
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      LowMemoryDetector::process_sensor_changes(jt);
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    }
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    if(has_gc_notification_event) {
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        GCNotifier::sendNotification(CHECK);
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    }
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    if(has_dcmd_notification_event) {
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      DCmdFactory::send_notification(CHECK);
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    }
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    if (acs_notify) {
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      AllocationContextService::notify(CHECK);
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    }
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  }
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}
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bool ServiceThread::is_service_thread(Thread* thread) {
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  return thread == _instance;
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}