jdk8-mips64-public/hotspot: src/share/vm/jfr/recorder/repository/jfrEmergencyDump.cpp@45c8de52649c

8246310: Clean commented-out code about ModuleEntry andPackageEntry in JFR
Reviewed-by: adinn

     1 /*

     2  * Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #include "precompiled.hpp"

    26 #include "jfr/jfrEvents.hpp"

    27 #include "jfr/leakprofiler/leakProfiler.hpp"

    28 #include "jfr/recorder/repository/jfrEmergencyDump.hpp"

    29 #include "jfr/recorder/service/jfrPostBox.hpp"

    30 #include "jfr/recorder/service/jfrRecorderService.hpp"

    31 #include "jfr/utilities/jfrTypes.hpp"

    32 #include "memory/resourceArea.hpp"

    33 #include "runtime/atomic.hpp"

    34 #include "runtime/handles.hpp"

    35 #include "runtime/globals.hpp"

    36 #include "runtime/mutexLocker.hpp"

    37 #include "runtime/thread.hpp"

    39 /*

    40 * We are just about to exit the VM, so we will be very aggressive

    41 * at this point in order to increase overall success of dumping jfr data:

    42 *

    43 * 1. if the thread state is not "_thread_in_vm", we will quick transition

    44 *    it to "_thread_in_vm".

    45 * 2. the nesting state for both resource and handle areas are unknown,

    46 *    so we allocate new fresh arenas, discarding the old ones.

    47 * 3. if the thread is the owner of some critical lock(s), unlock them.

    48 *

    49 * If we end up deadlocking in the attempt of dumping out jfr data,

    50 * we rely on the WatcherThread task "is_error_reported()",

    51 * to exit the VM after a hard-coded timeout.

    52 * This "safety net" somewhat explains the aggressiveness in this attempt.

    53 *

    54 */

    55 static void prepare_for_emergency_dump(Thread* thread) {

    56   if (thread->is_Java_thread()) {

    57     ((JavaThread*)thread)->set_thread_state(_thread_in_vm);

    58   }

    60 #ifdef ASSERT

    61   Monitor* owned_lock = thread->owned_locks();

    62   while (owned_lock != NULL) {

    63     Monitor* next = owned_lock->next();

    64     owned_lock->unlock();

    65     owned_lock = next;

    66   }

    67 #endif // ASSERT

    69   if (Threads_lock->owned_by_self()) {

    70     Threads_lock->unlock();

    71   }

    73   if (PackageTable_lock->owned_by_self()) {

    74     PackageTable_lock->unlock();

    75   }

    77   if (Heap_lock->owned_by_self()) {

    78     Heap_lock->unlock();

    79   }

    81   if (Safepoint_lock->owned_by_self()) {

    82     Safepoint_lock->unlock();

    83   }

    85   if (VMOperationQueue_lock->owned_by_self()) {

    86     VMOperationQueue_lock->unlock();

    87   }

    89   if (VMOperationRequest_lock->owned_by_self()) {

    90     VMOperationRequest_lock->unlock();

    91   }

    94   if (Service_lock->owned_by_self()) {

    95     Service_lock->unlock();

    96   }

    98   if (CodeCache_lock->owned_by_self()) {

    99     CodeCache_lock->unlock();

   100   }

   102   if (PeriodicTask_lock->owned_by_self()) {

   103     PeriodicTask_lock->unlock();

   104   }

   106   if (JfrMsg_lock->owned_by_self()) {

   107     JfrMsg_lock->unlock();

   108   }

   110   if (JfrBuffer_lock->owned_by_self()) {

   111     JfrBuffer_lock->unlock();

   112   }

   114   if (JfrStream_lock->owned_by_self()) {

   115     JfrStream_lock->unlock();

   116   }

   118   if (JfrStacktrace_lock->owned_by_self()) {

   119     JfrStacktrace_lock->unlock();

   120   }

   121 }

   123 static volatile int jfr_shutdown_lock = 0;

   125 static bool guard_reentrancy() {

   126   return Atomic::cmpxchg(1, &jfr_shutdown_lock, 0) == 0;

   127 }

   129 void JfrEmergencyDump::on_vm_shutdown(bool exception_handler) {

   130   if (!guard_reentrancy()) {

   131     return;

   132   }

   133   // function made non-reentrant

   134   Thread* thread = Thread::current();

   135   if (exception_handler) {

   136     // we are crashing

   137     if (thread->is_Watcher_thread()) {

   138       // The Watcher thread runs the periodic thread sampling task.

   139       // If it has crashed, it is likely that another thread is

   140       // left in a suspended state. This would mean the system

   141       // will not be able to ever move to a safepoint. We try

   142       // to avoid issuing safepoint operations when attempting

   143       // an emergency dump, but a safepoint might be already pending.

   144       return;

   145     }

   146     prepare_for_emergency_dump(thread);

   147   }

   148   EventDumpReason event;

   149   if (event.should_commit()) {

   150     event.set_reason(exception_handler ? "Crash" : "Out of Memory");

   151     event.set_recordingId(-1);

   152     event.commit();

   153   }

   154   if (!exception_handler) {

   155     // OOM

   156     LeakProfiler::emit_events(max_jlong, false);

   157   }

   158   const int messages = MSGBIT(MSG_VM_ERROR);

   159   ResourceMark rm(thread);

   160   HandleMark hm(thread);

   161   JfrRecorderService service;

   162   service.rotate(messages);

   163 }

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