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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
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25 // The following class hierarchy represents
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26 // a set of operations (VM_Operation) related to GC.
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27 //
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28 // VM_Operation
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29 // VM_GC_Operation
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30 // VM_GC_HeapInspection
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31 // VM_GenCollectForAllocation
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32 // VM_GenCollectFull
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33 // VM_GenCollectFullConcurrent
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34 // VM_ParallelGCFailedAllocation
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35 // VM_ParallelGCFailedPermanentAllocation
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36 // VM_ParallelGCSystemGC
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37 // VM_GC_Operation
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38 // - implements methods common to all classes in the hierarchy:
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39 // prevents multiple gc requests and manages lock on heap;
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40 //
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41 // VM_GC_HeapInspection
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42 // - prints class histogram on SIGBREAK if PrintClassHistogram
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43 // is specified; and also the attach "inspectheap" operation
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44 //
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45 // VM_GenCollectForAllocation
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46 // VM_ParallelGCFailedAllocation
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47 // VM_ParallelGCFailedPermanentAllocation
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48 // - this operation is invoked when allocation is failed;
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49 // operation performs garbage collection and tries to
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50 // allocate afterwards;
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51 //
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52 // VM_GenCollectFull
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53 // VM_GenCollectFullConcurrent
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54 // VM_ParallelGCSystemGC
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55 // - these operations preform full collection of heaps of
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56 // different kind
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57 //
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58
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59 class VM_GC_Operation: public VM_Operation {
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60 protected:
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61 BasicLock _pending_list_basic_lock; // for refs pending list notification (PLL)
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62 unsigned int _gc_count_before; // gc count before acquiring PLL
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63 unsigned int _full_gc_count_before; // full gc count before acquiring PLL
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64 bool _full; // whether a "full" collection
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65 bool _prologue_succeeded; // whether doit_prologue succeeded
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66 GCCause::Cause _gc_cause; // the putative cause for this gc op
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67 bool _gc_locked; // will be set if gc was locked
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68
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69 virtual bool skip_operation() const;
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70
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71 // java.lang.ref.Reference support
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72 void acquire_pending_list_lock();
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73 void release_and_notify_pending_list_lock();
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74
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75 public:
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76 VM_GC_Operation(unsigned int gc_count_before,
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77 unsigned int full_gc_count_before = 0,
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78 bool full = false) {
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79 _full = full;
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80 _prologue_succeeded = false;
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81 _gc_count_before = gc_count_before;
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82
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83 // A subclass constructor will likely overwrite the following
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84 _gc_cause = GCCause::_no_cause_specified;
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85
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86 _gc_locked = false;
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87
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88 if (full) {
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89 _full_gc_count_before = full_gc_count_before;
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90 }
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91 }
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92 ~VM_GC_Operation() {}
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93
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94 // Acquire the reference synchronization lock
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95 virtual bool doit_prologue();
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96 // Do notifyAll (if needed) and release held lock
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97 virtual void doit_epilogue();
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98
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99 virtual bool allow_nested_vm_operations() const { return true; }
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100 bool prologue_succeeded() const { return _prologue_succeeded; }
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101
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102 void set_gc_locked() { _gc_locked = true; }
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103 bool gc_locked() const { return _gc_locked; }
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104
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105 static void notify_gc_begin(bool full = false);
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106 static void notify_gc_end();
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107 };
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108
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109
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110 class VM_GC_HeapInspection: public VM_GC_Operation {
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111 private:
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112 outputStream* _out;
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113 bool _full_gc;
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114 public:
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115 VM_GC_HeapInspection(outputStream* out, bool request_full_gc) :
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116 VM_GC_Operation(0 /* total collections, dummy, ignored */,
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117 0 /* total full collections, dummy, ignored */,
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118 request_full_gc) {
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119 _out = out;
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120 _full_gc = request_full_gc;
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121 }
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122
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123 ~VM_GC_HeapInspection() {}
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124 virtual VMOp_Type type() const { return VMOp_GC_HeapInspection; }
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125 virtual bool skip_operation() const;
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126 virtual bool doit_prologue();
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127 virtual void doit();
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128 };
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129
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130
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131 class VM_GenCollectForAllocation: public VM_GC_Operation {
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132 private:
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133 HeapWord* _res;
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134 size_t _size; // size of object to be allocated.
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135 bool _tlab; // alloc is of a tlab.
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136 public:
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137 VM_GenCollectForAllocation(size_t size,
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138 bool tlab,
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139 unsigned int gc_count_before)
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140 : VM_GC_Operation(gc_count_before),
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141 _size(size),
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142 _tlab(tlab) {
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143 _res = NULL;
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144 }
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145 ~VM_GenCollectForAllocation() {}
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146 virtual VMOp_Type type() const { return VMOp_GenCollectForAllocation; }
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147 virtual void doit();
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148 HeapWord* result() const { return _res; }
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149 };
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150
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151
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152 // VM operation to invoke a collection of the heap as a
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153 // GenCollectedHeap heap.
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154 class VM_GenCollectFull: public VM_GC_Operation {
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155 private:
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156 int _max_level;
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157 public:
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158 VM_GenCollectFull(unsigned int gc_count_before,
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159 unsigned int full_gc_count_before,
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160 GCCause::Cause gc_cause,
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161 int max_level)
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162 : VM_GC_Operation(gc_count_before, full_gc_count_before, true /* full */),
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163 _max_level(max_level)
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164 { _gc_cause = gc_cause; }
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165 ~VM_GenCollectFull() {}
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166 virtual VMOp_Type type() const { return VMOp_GenCollectFull; }
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167 virtual void doit();
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168 };
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