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1 /*
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2 * Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24 # include "incls/_precompiled.incl"
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25 # include "incls/_vmGCOperations.cpp.incl"
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26
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27 HS_DTRACE_PROBE_DECL1(hotspot, gc__begin, bool);
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28 HS_DTRACE_PROBE_DECL(hotspot, gc__end);
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29
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30 // The same dtrace probe can't be inserted in two different files, so we
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31 // have to call it here, so it's only in one file. Can't create new probes
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32 // for the other file anymore. The dtrace probes have to remain stable.
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33 void VM_GC_Operation::notify_gc_begin(bool full) {
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34 HS_DTRACE_PROBE1(hotspot, gc__begin, full);
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35 }
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36
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37 void VM_GC_Operation::notify_gc_end() {
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38 HS_DTRACE_PROBE(hotspot, gc__end);
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39 }
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40
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41 void VM_GC_Operation::acquire_pending_list_lock() {
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42 // we may enter this with pending exception set
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43 instanceRefKlass::acquire_pending_list_lock(&_pending_list_basic_lock);
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44 }
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45
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46
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47 void VM_GC_Operation::release_and_notify_pending_list_lock() {
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48
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49 instanceRefKlass::release_and_notify_pending_list_lock(&_pending_list_basic_lock);
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50 }
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51
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52 // Allocations may fail in several threads at about the same time,
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53 // resulting in multiple gc requests. We only want to do one of them.
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54 // In case a GC locker is active and the need for a GC is already signalled,
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55 // we want to skip this GC attempt altogether, without doing a futile
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56 // safepoint operation.
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57 bool VM_GC_Operation::skip_operation() const {
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58 bool skip = (_gc_count_before != Universe::heap()->total_collections());
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59 if (_full && skip) {
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60 skip = (_full_gc_count_before != Universe::heap()->total_full_collections());
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61 }
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62 if (!skip && GC_locker::is_active_and_needs_gc()) {
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63 skip = Universe::heap()->is_maximal_no_gc();
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64 assert(!(skip && (_gc_cause == GCCause::_gc_locker)),
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65 "GC_locker cannot be active when initiating GC");
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66 }
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67 return skip;
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68 }
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69
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70 bool VM_GC_Operation::doit_prologue() {
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71 assert(Thread::current()->is_Java_thread(), "just checking");
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72
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73 acquire_pending_list_lock();
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74 // If the GC count has changed someone beat us to the collection
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75 // Get the Heap_lock after the pending_list_lock.
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76 Heap_lock->lock();
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77 // Check invocations
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78 if (skip_operation()) {
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79 // skip collection
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80 Heap_lock->unlock();
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81 release_and_notify_pending_list_lock();
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82 _prologue_succeeded = false;
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83 } else {
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84 _prologue_succeeded = true;
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85 }
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86 return _prologue_succeeded;
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87 }
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88
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89
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90 void VM_GC_Operation::doit_epilogue() {
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91 assert(Thread::current()->is_Java_thread(), "just checking");
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92 // Release the Heap_lock first.
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93 Heap_lock->unlock();
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94 release_and_notify_pending_list_lock();
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95 }
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96
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97 bool VM_GC_HeapInspection::doit_prologue() {
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98 if (Universe::heap()->supports_heap_inspection()) {
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99 return VM_GC_Operation::doit_prologue();
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100 } else {
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101 return false;
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102 }
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103 }
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104
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105 bool VM_GC_HeapInspection::skip_operation() const {
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106 assert(Universe::heap()->supports_heap_inspection(), "huh?");
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107 return false;
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108 }
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109
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110 void VM_GC_HeapInspection::doit() {
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111 HandleMark hm;
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112 CollectedHeap* ch = Universe::heap();
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113 if (_full_gc) {
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114 ch->collect_as_vm_thread(GCCause::_heap_inspection);
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115 } else {
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116 // make the heap parsable (no need to retire TLABs)
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117 ch->ensure_parsability(false);
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118 }
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119 HeapInspection::heap_inspection(_out);
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120 }
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121
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122
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123 void VM_GenCollectForAllocation::doit() {
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124 JvmtiGCForAllocationMarker jgcm;
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125 notify_gc_begin(false);
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126
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127 GenCollectedHeap* gch = GenCollectedHeap::heap();
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128 GCCauseSetter gccs(gch, _gc_cause);
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129 _res = gch->satisfy_failed_allocation(_size, _tlab);
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130 assert(gch->is_in_reserved_or_null(_res), "result not in heap");
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131
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132 if (_res == NULL && GC_locker::is_active_and_needs_gc()) {
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133 set_gc_locked();
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134 }
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135 notify_gc_end();
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136 }
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137
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138 void VM_GenCollectFull::doit() {
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139 JvmtiGCFullMarker jgcm;
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140 notify_gc_begin(true);
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141
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142 GenCollectedHeap* gch = GenCollectedHeap::heap();
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143 GCCauseSetter gccs(gch, _gc_cause);
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144 gch->do_full_collection(gch->must_clear_all_soft_refs(), _max_level);
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145 notify_gc_end();
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146 }
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