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annotate src/share/vm/gc_implementation/g1/satbQueue.hpp @ 12343:d55c004e1d4d

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8025305: Cleanup CardTableModRefBS usage in G1 Summary: Move some G1 specific code from CardTableModRefBS to G1SATBCardTableModRefBS. Reviewed-by: brutisso, tschatzl, ehelin
author mgerdin
date Tue, 24 Sep 2013 14:46:29 +0200
parents 2ace1c4ee8da
children 89ac31a5a7a7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP
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27
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28 #include "gc_implementation/g1/ptrQueue.hpp"
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29
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30 class ObjectClosure;
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31 class JavaThread;
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32 class SATBMarkQueueSet;
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33
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34 // A ptrQueue whose elements are "oops", pointers to object heads.
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35 class ObjPtrQueue: public PtrQueue {
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36 friend class SATBMarkQueueSet;
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37
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38 private:
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39 // Filter out unwanted entries from the buffer.
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40 void filter();
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41
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42 // Apply the closure to all elements.
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43 void apply_closure(ObjectClosure* cl);
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44
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45 // Apply the closure to all elements and empty the buffer;
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46 void apply_closure_and_empty(ObjectClosure* cl);
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47
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48 // Apply the closure to all elements of "buf", down to "index" (inclusive.)
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49 static void apply_closure_to_buffer(ObjectClosure* cl,
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50 void** buf, size_t index, size_t sz);
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51
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52 public:
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53 ObjPtrQueue(PtrQueueSet* qset, bool perm = false) :
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54 // SATB queues are only active during marking cycles. We create
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55 // them with their active field set to false. If a thread is
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56 // created during a cycle and its SATB queue needs to be activated
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57 // before the thread starts running, we'll need to set its active
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58 // field to true. This is done in JavaThread::initialize_queues().
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59 PtrQueue(qset, perm, false /* active */) { }
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60
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61 // Overrides PtrQueue::flush() so that it can filter the buffer
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62 // before it is flushed.
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63 virtual void flush();
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64
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65 // Overrides PtrQueue::should_enqueue_buffer(). See the method's
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66 // definition for more information.
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67 virtual bool should_enqueue_buffer();
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68
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69 #ifndef PRODUCT
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70 // Helpful for debugging
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71 void print(const char* name);
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72 static void print(const char* name, void** buf, size_t index, size_t sz);
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73 #endif // PRODUCT
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74
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75 void verify_oops_in_buffer() NOT_DEBUG_RETURN;
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76 };
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77
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78 class SATBMarkQueueSet: public PtrQueueSet {
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79 ObjectClosure* _closure;
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80 ObjectClosure** _par_closures; // One per ParGCThread.
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81
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82 ObjPtrQueue _shared_satb_queue;
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83
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84 // Utility function to support sequential and parallel versions. If
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85 // "par" is true, then "worker" is the par thread id; if "false", worker
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86 // is ignored.
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87 bool apply_closure_to_completed_buffer_work(bool par, int worker);
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88
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89 #ifdef ASSERT
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90 void dump_active_values(JavaThread* first, bool expected_active);
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91 #endif // ASSERT
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92
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93 public:
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94 SATBMarkQueueSet();
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95
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96 void initialize(Monitor* cbl_mon, Mutex* fl_lock,
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97 int process_completed_threshold,
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98 Mutex* lock);
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99
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100 static void handle_zero_index_for_thread(JavaThread* t);
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101
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102 // Apply "set_active(b)" to all Java threads' SATB queues. It should be
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103 // called only with the world stopped. The method will assert that the
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104 // SATB queues of all threads it visits, as well as the SATB queue
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105 // set itself, has an active value same as expected_active.
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106 void set_active_all_threads(bool b, bool expected_active);
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107
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108 // Filter all the currently-active SATB buffers.
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109 void filter_thread_buffers();
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110
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111 // Register "blk" as "the closure" for all queues. Only one such closure
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112 // is allowed. The "apply_closure_to_completed_buffer" method will apply
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113 // this closure to a completed buffer, and "iterate_closure_all_threads"
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114 // applies it to partially-filled buffers (the latter should only be done
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115 // with the world stopped).
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116 void set_closure(ObjectClosure* closure);
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117 // Set the parallel closures: pointer is an array of pointers to
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118 // closures, one for each parallel GC thread.
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119 void set_par_closure(int i, ObjectClosure* closure);
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120
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121 // Apply the registered closure to all entries on each
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122 // currently-active buffer and then empty the buffer. It should only
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123 // be called serially and at a safepoint.
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124 void iterate_closure_all_threads();
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125 // Parallel version of the above.
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126 void par_iterate_closure_all_threads(int worker);
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127
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128 // If there exists some completed buffer, pop it, then apply the
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129 // registered closure to all its elements, and return true. If no
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130 // completed buffers exist, return false.
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131 bool apply_closure_to_completed_buffer() {
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132 return apply_closure_to_completed_buffer_work(false, 0);
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133 }
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134 // Parallel version of the above.
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135 bool par_apply_closure_to_completed_buffer(int worker) {
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136 return apply_closure_to_completed_buffer_work(true, worker);
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137 }
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138
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139 // Apply the given closure on enqueued and currently-active buffers
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140 // respectively. Both methods are read-only, i.e., they do not
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141 // modify any of the buffers.
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142 void iterate_completed_buffers_read_only(ObjectClosure* cl);
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143 void iterate_thread_buffers_read_only(ObjectClosure* cl);
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144
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145 #ifndef PRODUCT
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146 // Helpful for debugging
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147 void print_all(const char* msg);
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148 #endif // PRODUCT
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149
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150 ObjPtrQueue* shared_satb_queue() { return &_shared_satb_queue; }
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151
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152 // If a marking is being abandoned, reset any unprocessed log buffers.
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153 void abandon_partial_marking();
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154 };
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155
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156 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP