1 /*
   2  * Copyright (c) 2005, 2015, 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  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/classLoader.hpp"
  27 #include "classfile/javaClasses.hpp"
  28 #include "gc/shared/allocTracer.hpp"
  29 #include "gc/shared/gcId.hpp"
  30 #include "gc/shared/gcLocker.inline.hpp"
  31 #include "gc/shared/genCollectedHeap.hpp"
  32 #include "gc/shared/vmGCOperations.hpp"
  33 #include "memory/oopFactory.hpp"
  34 #include "logging/log.hpp"
  35 #include "oops/instanceKlass.hpp"
  36 #include "oops/instanceRefKlass.hpp"
  37 #include "runtime/handles.inline.hpp"
  38 #include "runtime/init.hpp"
  39 #include "runtime/interfaceSupport.hpp"
  40 #include "utilities/dtrace.hpp"
  41 #include "utilities/macros.hpp"
  42 #include "utilities/preserveException.hpp"
  43 #if INCLUDE_ALL_GCS
  44 #include "gc/g1/g1CollectedHeap.inline.hpp"
  45 #endif // INCLUDE_ALL_GCS
  46 
  47 VM_GC_Operation::~VM_GC_Operation() {
  48   CollectedHeap* ch = Universe::heap();
  49   ch->collector_policy()->set_all_soft_refs_clear(false);
  50 }
  51 
  52 // The same dtrace probe can't be inserted in two different files, so we
  53 // have to call it here, so it's only in one file.  Can't create new probes
  54 // for the other file anymore.   The dtrace probes have to remain stable.
  55 void VM_GC_Operation::notify_gc_begin(bool full) {
  56   HOTSPOT_GC_BEGIN(
  57                    full);
  58   HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
  59 }
  60 
  61 void VM_GC_Operation::notify_gc_end() {
  62   HOTSPOT_GC_END();
  63   HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
  64 }
  65 
  66 void VM_GC_Operation::acquire_pending_list_lock() {
  67   // we may enter this with pending exception set
  68   InstanceRefKlass::acquire_pending_list_lock(&_pending_list_basic_lock);
  69 }
  70 
  71 
  72 void VM_GC_Operation::release_and_notify_pending_list_lock() {
  73 
  74   InstanceRefKlass::release_and_notify_pending_list_lock(&_pending_list_basic_lock);
  75 }
  76 
  77 // Allocations may fail in several threads at about the same time,
  78 // resulting in multiple gc requests.  We only want to do one of them.
  79 // In case a GC locker is active and the need for a GC is already signaled,
  80 // we want to skip this GC attempt altogether, without doing a futile
  81 // safepoint operation.
  82 bool VM_GC_Operation::skip_operation() const {
  83   bool skip = (_gc_count_before != Universe::heap()->total_collections());
  84   if (_full && skip) {
  85     skip = (_full_gc_count_before != Universe::heap()->total_full_collections());
  86   }
  87   if (!skip && GCLocker::is_active_and_needs_gc()) {
  88     skip = Universe::heap()->is_maximal_no_gc();
  89     assert(!(skip && (_gc_cause == GCCause::_gc_locker)),
  90            "GCLocker cannot be active when initiating GC");
  91   }
  92   return skip;
  93 }
  94 

   1 /*
   2  * Copyright (c) 2005, 2016, 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  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/classLoader.hpp"
  27 #include "classfile/javaClasses.hpp"
  28 #include "gc/shared/allocTracer.hpp"
  29 #include "gc/shared/gcId.hpp"
  30 #include "gc/shared/gcLocker.inline.hpp"
  31 #include "gc/shared/genCollectedHeap.hpp"
  32 #include "gc/shared/vmGCOperations.hpp"

  33 #include "logging/log.hpp"
  34 #include "memory/oopFactory.hpp"

  35 #include "runtime/handles.inline.hpp"
  36 #include "runtime/init.hpp"
  37 #include "runtime/interfaceSupport.hpp"
  38 #include "utilities/dtrace.hpp"
  39 #include "utilities/macros.hpp"
  40 #include "utilities/preserveException.hpp"
  41 #if INCLUDE_ALL_GCS
  42 #include "gc/g1/g1CollectedHeap.inline.hpp"
  43 #endif // INCLUDE_ALL_GCS
  44 
  45 VM_GC_Operation::~VM_GC_Operation() {
  46   CollectedHeap* ch = Universe::heap();
  47   ch->collector_policy()->set_all_soft_refs_clear(false);
  48 }
  49 
  50 // The same dtrace probe can't be inserted in two different files, so we
  51 // have to call it here, so it's only in one file.  Can't create new probes
  52 // for the other file anymore.   The dtrace probes have to remain stable.
  53 void VM_GC_Operation::notify_gc_begin(bool full) {
  54   HOTSPOT_GC_BEGIN(
  55                    full);
  56   HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
  57 }
  58 
  59 void VM_GC_Operation::notify_gc_end() {
  60   HOTSPOT_GC_END();
  61   HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
  62 }
  63 
  64 void VM_GC_Operation::acquire_pending_list_lock() {
  65   _pending_list_locker.lock();

  66 }
  67 

  68 void VM_GC_Operation::release_and_notify_pending_list_lock() {
  69   _pending_list_locker.unlock();

  70 }
  71 
  72 // Allocations may fail in several threads at about the same time,
  73 // resulting in multiple gc requests.  We only want to do one of them.
  74 // In case a GC locker is active and the need for a GC is already signaled,
  75 // we want to skip this GC attempt altogether, without doing a futile
  76 // safepoint operation.
  77 bool VM_GC_Operation::skip_operation() const {
  78   bool skip = (_gc_count_before != Universe::heap()->total_collections());
  79   if (_full && skip) {
  80     skip = (_full_gc_count_before != Universe::heap()->total_full_collections());
  81   }
  82   if (!skip && GCLocker::is_active_and_needs_gc()) {
  83     skip = Universe::heap()->is_maximal_no_gc();
  84     assert(!(skip && (_gc_cause == GCCause::_gc_locker)),
  85            "GCLocker cannot be active when initiating GC");
  86   }
  87   return skip;
  88 }
  89