annotate src/share/vm/gc_implementation/g1/satbQueue.cpp @ 3888:4fe626cbf0bf

7066841: remove MacroAssembler::br_on_reg_cond() on sparc Summary: Remove the macro assembler routine br_on_reg_cond() and replace the remaining calls to that routine with an equivalent. Reviewed-by: kvn, iveresov
author johnc
date Wed, 31 Aug 2011 10:16:02 -0700
parents 7e37af9d69ef
children 4dfb2df418f2
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1 /*
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2 * Copyright (c) 2001, 2011, 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 #include "precompiled.hpp"
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26 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
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27 #include "gc_implementation/g1/satbQueue.hpp"
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28 #include "memory/allocation.inline.hpp"
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29 #include "memory/sharedHeap.hpp"
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30 #include "runtime/mutexLocker.hpp"
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31 #include "runtime/thread.hpp"
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32
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33 // This method removes entries from an SATB buffer that will not be
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34 // useful to the concurrent marking threads. An entry is removed if it
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35 // satisfies one of the following conditions:
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36 //
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37 // * it points to an object outside the G1 heap (G1's concurrent
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38 // marking only visits objects inside the G1 heap),
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39 // * it points to an object that has been allocated since marking
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40 // started (according to SATB those objects do not need to be
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41 // visited during marking), or
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42 // * it points to an object that has already been marked (no need to
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43 // process it again).
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44 //
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45 // The rest of the entries will be retained and are compacted towards
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46 // the top of the buffer. If with this filtering we clear a large
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47 // enough chunk of the buffer we can re-use it (instead of enqueueing
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48 // it) and we can just allow the mutator to carry on executing.
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49
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50 bool ObjPtrQueue::should_enqueue_buffer() {
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51 assert(_lock == NULL || _lock->owned_by_self(),
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52 "we should have taken the lock before calling this");
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53
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54 // A value of 0 means "don't filter SATB buffers".
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55 if (G1SATBBufferEnqueueingThresholdPercent == 0) {
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56 return true;
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57 }
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58
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59 G1CollectedHeap* g1h = G1CollectedHeap::heap();
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60
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61 // This method should only be called if there is a non-NULL buffer
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62 // that is full.
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63 assert(_index == 0, "pre-condition");
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64 assert(_buf != NULL, "pre-condition");
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65
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66 void** buf = _buf;
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67 size_t sz = _sz;
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68
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69 // Used for sanity checking at the end of the loop.
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70 debug_only(size_t entries = 0; size_t retained = 0;)
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71
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72 size_t i = sz;
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73 size_t new_index = sz;
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74
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75 // Given that we are expecting _index == 0, we could have changed
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76 // the loop condition to (i > 0). But we are using _index for
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77 // generality.
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78 while (i > _index) {
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79 assert(i > 0, "we should have at least one more entry to process");
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80 i -= oopSize;
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81 debug_only(entries += 1;)
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82 oop* p = (oop*) &buf[byte_index_to_index((int) i)];
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83 oop obj = *p;
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84 // NULL the entry so that unused parts of the buffer contain NULLs
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85 // at the end. If we are going to retain it we will copy it to its
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86 // final place. If we have retained all entries we have visited so
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87 // far, we'll just end up copying it to the same place.
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88 *p = NULL;
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89
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90 bool retain = g1h->is_obj_ill(obj);
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91 if (retain) {
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92 assert(new_index > 0, "we should not have already filled up the buffer");
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93 new_index -= oopSize;
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94 assert(new_index >= i,
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95 "new_index should never be below i, as we alwaysr compact 'up'");
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96 oop* new_p = (oop*) &buf[byte_index_to_index((int) new_index)];
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97 assert(new_p >= p, "the destination location should never be below "
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98 "the source as we always compact 'up'");
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99 assert(*new_p == NULL,
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100 "we should have already cleared the destination location");
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101 *new_p = obj;
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102 debug_only(retained += 1;)
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103 }
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104 }
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105 size_t entries_calc = (sz - _index) / oopSize;
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106 assert(entries == entries_calc, "the number of entries we counted "
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107 "should match the number of entries we calculated");
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108 size_t retained_calc = (sz - new_index) / oopSize;
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109 assert(retained == retained_calc, "the number of retained entries we counted "
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110 "should match the number of retained entries we calculated");
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111 size_t perc = retained_calc * 100 / entries_calc;
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112 bool should_enqueue = perc > (size_t) G1SATBBufferEnqueueingThresholdPercent;
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113 _index = new_index;
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114
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115 return should_enqueue;
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116 }
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117
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118 void ObjPtrQueue::apply_closure(ObjectClosure* cl) {
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119 if (_buf != NULL) {
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120 apply_closure_to_buffer(cl, _buf, _index, _sz);
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121 _index = _sz;
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122 }
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123 }
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124
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125 void ObjPtrQueue::apply_closure_to_buffer(ObjectClosure* cl,
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126 void** buf, size_t index, size_t sz) {
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127 if (cl == NULL) return;
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128 for (size_t i = index; i < sz; i += oopSize) {
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129 oop obj = (oop)buf[byte_index_to_index((int)i)];
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130 // There can be NULL entries because of destructors.
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131 if (obj != NULL) {
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132 cl->do_object(obj);
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133 }
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134 }
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135 }
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136
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137 #ifdef ASSERT
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138 void ObjPtrQueue::verify_oops_in_buffer() {
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139 if (_buf == NULL) return;
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140 for (size_t i = _index; i < _sz; i += oopSize) {
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141 oop obj = (oop)_buf[byte_index_to_index((int)i)];
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142 assert(obj != NULL && obj->is_oop(true /* ignore mark word */),
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143 "Not an oop");
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144 }
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145 }
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146 #endif
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147
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148 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away
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149 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list
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150 #endif // _MSC_VER
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151
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152
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153 SATBMarkQueueSet::SATBMarkQueueSet() :
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154 PtrQueueSet(),
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155 _closure(NULL), _par_closures(NULL),
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156 _shared_satb_queue(this, true /*perm*/)
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157 {}
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158
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159 void SATBMarkQueueSet::initialize(Monitor* cbl_mon, Mutex* fl_lock,
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160 int process_completed_threshold,
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161 Mutex* lock) {
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162 PtrQueueSet::initialize(cbl_mon, fl_lock, process_completed_threshold, -1);
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163 _shared_satb_queue.set_lock(lock);
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164 if (ParallelGCThreads > 0) {
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165 _par_closures = NEW_C_HEAP_ARRAY(ObjectClosure*, ParallelGCThreads);
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166 }
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167 }
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168
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169
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170 void SATBMarkQueueSet::handle_zero_index_for_thread(JavaThread* t) {
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171 DEBUG_ONLY(t->satb_mark_queue().verify_oops_in_buffer();)
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172 t->satb_mark_queue().handle_zero_index();
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173 }
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174
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175 #ifdef ASSERT
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176 void SATBMarkQueueSet::dump_active_values(JavaThread* first,
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177 bool expected_active) {
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178 gclog_or_tty->print_cr("SATB queue active values for Java Threads");
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179 gclog_or_tty->print_cr(" SATB queue set: active is %s",
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180 (is_active()) ? "TRUE" : "FALSE");
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181 gclog_or_tty->print_cr(" expected_active is %s",
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182 (expected_active) ? "TRUE" : "FALSE");
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183 for (JavaThread* t = first; t; t = t->next()) {
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184 bool active = t->satb_mark_queue().is_active();
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185 gclog_or_tty->print_cr(" thread %s, active is %s",
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186 t->name(), (active) ? "TRUE" : "FALSE");
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187 }
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188 }
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189 #endif // ASSERT
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190
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191 void SATBMarkQueueSet::set_active_all_threads(bool b,
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192 bool expected_active) {
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193 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint.");
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194 JavaThread* first = Threads::first();
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195
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196 #ifdef ASSERT
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197 if (_all_active != expected_active) {
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198 dump_active_values(first, expected_active);
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199
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200 // I leave this here as a guarantee, instead of an assert, so
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201 // that it will still be compiled in if we choose to uncomment
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202 // the #ifdef ASSERT in a product build. The whole block is
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203 // within an #ifdef ASSERT so the guarantee will not be compiled
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204 // in a product build anyway.
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205 guarantee(false,
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206 "SATB queue set has an unexpected active value");
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207 }
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208 #endif // ASSERT
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209 _all_active = b;
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210
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211 for (JavaThread* t = first; t; t = t->next()) {
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212 #ifdef ASSERT
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213 bool active = t->satb_mark_queue().is_active();
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214 if (active != expected_active) {
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215 dump_active_values(first, expected_active);
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216
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217 // I leave this here as a guarantee, instead of an assert, so
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218 // that it will still be compiled in if we choose to uncomment
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219 // the #ifdef ASSERT in a product build. The whole block is
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220 // within an #ifdef ASSERT so the guarantee will not be compiled
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221 // in a product build anyway.
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222 guarantee(false,
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223 "thread has an unexpected active value in its SATB queue");
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224 }
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225 #endif // ASSERT
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226 t->satb_mark_queue().set_active(b);
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227 }
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228 }
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229
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230 void SATBMarkQueueSet::set_closure(ObjectClosure* closure) {
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231 _closure = closure;
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232 }
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233
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234 void SATBMarkQueueSet::set_par_closure(int i, ObjectClosure* par_closure) {
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235 assert(ParallelGCThreads > 0 && _par_closures != NULL, "Precondition");
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236 _par_closures[i] = par_closure;
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237 }
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238
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239 void SATBMarkQueueSet::iterate_closure_all_threads() {
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240 for(JavaThread* t = Threads::first(); t; t = t->next()) {
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241 t->satb_mark_queue().apply_closure(_closure);
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242 }
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243 shared_satb_queue()->apply_closure(_closure);
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244 }
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245
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246 void SATBMarkQueueSet::par_iterate_closure_all_threads(int worker) {
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247 SharedHeap* sh = SharedHeap::heap();
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248 int parity = sh->strong_roots_parity();
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249
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250 for(JavaThread* t = Threads::first(); t; t = t->next()) {
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251 if (t->claim_oops_do(true, parity)) {
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252 t->satb_mark_queue().apply_closure(_par_closures[worker]);
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253 }
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254 }
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255 // We'll have worker 0 do this one.
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256 if (worker == 0) {
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257 shared_satb_queue()->apply_closure(_par_closures[0]);
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258 }
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259 }
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260
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261 bool SATBMarkQueueSet::apply_closure_to_completed_buffer_work(bool par,
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262 int worker) {
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263 BufferNode* nd = NULL;
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264 {
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265 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag);
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266 if (_completed_buffers_head != NULL) {
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267 nd = _completed_buffers_head;
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268 _completed_buffers_head = nd->next();
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269 if (_completed_buffers_head == NULL) _completed_buffers_tail = NULL;
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270 _n_completed_buffers--;
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271 if (_n_completed_buffers == 0) _process_completed = false;
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272 }
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273 }
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274 ObjectClosure* cl = (par ? _par_closures[worker] : _closure);
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275 if (nd != NULL) {
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276 void **buf = BufferNode::make_buffer_from_node(nd);
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277 ObjPtrQueue::apply_closure_to_buffer(cl, buf, 0, _sz);
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278 deallocate_buffer(buf);
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279 return true;
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280 } else {
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281 return false;
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282 }
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283 }
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284
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285 void SATBMarkQueueSet::abandon_partial_marking() {
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286 BufferNode* buffers_to_delete = NULL;
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287 {
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288 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag);
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289 while (_completed_buffers_head != NULL) {
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290 BufferNode* nd = _completed_buffers_head;
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291 _completed_buffers_head = nd->next();
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292 nd->set_next(buffers_to_delete);
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293 buffers_to_delete = nd;
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294 }
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295 _completed_buffers_tail = NULL;
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296 _n_completed_buffers = 0;
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297 DEBUG_ONLY(assert_completed_buffer_list_len_correct_locked());
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298 }
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299 while (buffers_to_delete != NULL) {
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300 BufferNode* nd = buffers_to_delete;
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301 buffers_to_delete = nd->next();
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302 deallocate_buffer(BufferNode::make_buffer_from_node(nd));
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303 }
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304 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint.");
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305 // So we can safely manipulate these queues.
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306 for (JavaThread* t = Threads::first(); t; t = t->next()) {
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307 t->satb_mark_queue().reset();
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308 }
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309 shared_satb_queue()->reset();
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310 }