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1 /*
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2 * Copyright 2001-2007 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 # include "incls/_precompiled.incl"
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26 # include "incls/_dirtyCardQueue.cpp.incl"
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27
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28 bool DirtyCardQueue::apply_closure(CardTableEntryClosure* cl,
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29 bool consume,
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30 size_t worker_i) {
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31 bool res = true;
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32 if (_buf != NULL) {
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33 res = apply_closure_to_buffer(cl, _buf, _index, _sz,
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34 consume,
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35 (int) worker_i);
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36 if (res && consume) _index = _sz;
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37 }
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38 return res;
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39 }
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40
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41 bool DirtyCardQueue::apply_closure_to_buffer(CardTableEntryClosure* cl,
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42 void** buf,
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43 size_t index, size_t sz,
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44 bool consume,
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45 int worker_i) {
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46 if (cl == NULL) return true;
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47 for (size_t i = index; i < sz; i += oopSize) {
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48 int ind = byte_index_to_index((int)i);
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49 jbyte* card_ptr = (jbyte*)buf[ind];
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50 if (card_ptr != NULL) {
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51 // Set the entry to null, so we don't do it again (via the test
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52 // above) if we reconsider this buffer.
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53 if (consume) buf[ind] = NULL;
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54 if (!cl->do_card_ptr(card_ptr, worker_i)) return false;
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55 }
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56 }
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57 return true;
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58 }
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59
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60 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away
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61 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list
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62 #endif // _MSC_VER
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63
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64 DirtyCardQueueSet::DirtyCardQueueSet() :
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65 PtrQueueSet(true /*notify_when_complete*/),
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66 _closure(NULL),
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67 _shared_dirty_card_queue(this, true /*perm*/),
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68 _free_ids(NULL),
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69 _processed_buffers_mut(0), _processed_buffers_rs_thread(0)
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70 {
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71 _all_active = true;
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72 }
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73
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74 size_t DirtyCardQueueSet::num_par_ids() {
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75 return MAX2(ParallelGCThreads, (size_t)2);
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76 }
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77
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78
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79 void DirtyCardQueueSet::initialize(Monitor* cbl_mon, Mutex* fl_lock,
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80 int max_completed_queue,
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81 Mutex* lock) {
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82 PtrQueueSet::initialize(cbl_mon, fl_lock, max_completed_queue);
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83 set_buffer_size(DCQBarrierQueueBufferSize);
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84 set_process_completed_threshold(DCQBarrierProcessCompletedThreshold);
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85
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86 _shared_dirty_card_queue.set_lock(lock);
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87 _free_ids = new FreeIdSet((int) num_par_ids(), _cbl_mon);
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88 bool b = _free_ids->claim_perm_id(0);
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89 guarantee(b, "Must reserve id zero for concurrent refinement thread.");
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90 }
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91
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92 void DirtyCardQueueSet::handle_zero_index_for_thread(JavaThread* t) {
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93 t->dirty_card_queue().handle_zero_index();
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94 }
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95
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96 void DirtyCardQueueSet::set_closure(CardTableEntryClosure* closure) {
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97 _closure = closure;
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98 }
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99
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100 void DirtyCardQueueSet::iterate_closure_all_threads(bool consume,
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101 size_t worker_i) {
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102 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint.");
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103 for(JavaThread* t = Threads::first(); t; t = t->next()) {
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104 bool b = t->dirty_card_queue().apply_closure(_closure, consume);
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105 guarantee(b, "Should not be interrupted.");
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106 }
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107 bool b = shared_dirty_card_queue()->apply_closure(_closure,
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108 consume,
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109 worker_i);
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110 guarantee(b, "Should not be interrupted.");
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111 }
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112
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113 bool DirtyCardQueueSet::mut_process_buffer(void** buf) {
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114
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115 // Used to determine if we had already claimed a par_id
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116 // before entering this method.
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117 bool already_claimed = false;
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118
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119 // We grab the current JavaThread.
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120 JavaThread* thread = JavaThread::current();
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121
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122 // We get the the number of any par_id that this thread
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123 // might have already claimed.
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124 int worker_i = thread->get_claimed_par_id();
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125
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126 // If worker_i is not -1 then the thread has already claimed
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127 // a par_id. We make note of it using the already_claimed value
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128 if (worker_i != -1) {
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129 already_claimed = true;
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130 } else {
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131
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132 // Otherwise we need to claim a par id
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133 worker_i = _free_ids->claim_par_id();
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134
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135 // And store the par_id value in the thread
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136 thread->set_claimed_par_id(worker_i);
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137 }
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138
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139 bool b = false;
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140 if (worker_i != -1) {
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141 b = DirtyCardQueue::apply_closure_to_buffer(_closure, buf, 0,
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142 _sz, true, worker_i);
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143 if (b) Atomic::inc(&_processed_buffers_mut);
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144
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145 // If we had not claimed an id before entering the method
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146 // then we must release the id.
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147 if (!already_claimed) {
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148
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149 // we release the id
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150 _free_ids->release_par_id(worker_i);
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151
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152 // and set the claimed_id in the thread to -1
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153 thread->set_claimed_par_id(-1);
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154 }
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155 }
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156 return b;
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157 }
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158
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159 DirtyCardQueueSet::CompletedBufferNode*
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160 DirtyCardQueueSet::get_completed_buffer_lock(int stop_at) {
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161 CompletedBufferNode* nd = NULL;
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162 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag);
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163
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164 if ((int)_n_completed_buffers <= stop_at) {
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165 _process_completed = false;
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166 return NULL;
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167 }
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168
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169 if (_completed_buffers_head != NULL) {
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170 nd = _completed_buffers_head;
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171 _completed_buffers_head = nd->next;
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172 if (_completed_buffers_head == NULL)
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173 _completed_buffers_tail = NULL;
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174 _n_completed_buffers--;
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175 }
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176 debug_only(assert_completed_buffer_list_len_correct_locked());
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177 return nd;
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178 }
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179
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180 // We only do this in contexts where there is no concurrent enqueueing.
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181 DirtyCardQueueSet::CompletedBufferNode*
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182 DirtyCardQueueSet::get_completed_buffer_CAS() {
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183 CompletedBufferNode* nd = _completed_buffers_head;
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184
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185 while (nd != NULL) {
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186 CompletedBufferNode* next = nd->next;
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187 CompletedBufferNode* result =
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188 (CompletedBufferNode*)Atomic::cmpxchg_ptr(next,
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189 &_completed_buffers_head,
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190 nd);
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191 if (result == nd) {
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192 return result;
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193 } else {
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194 nd = _completed_buffers_head;
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195 }
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196 }
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197 assert(_completed_buffers_head == NULL, "Loop post");
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198 _completed_buffers_tail = NULL;
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199 return NULL;
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200 }
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201
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202 bool DirtyCardQueueSet::
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203 apply_closure_to_completed_buffer_helper(int worker_i,
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204 CompletedBufferNode* nd) {
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205 if (nd != NULL) {
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206 bool b =
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207 DirtyCardQueue::apply_closure_to_buffer(_closure, nd->buf,
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208 nd->index, _sz,
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209 true, worker_i);
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210 void** buf = nd->buf;
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211 delete nd;
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212 if (b) {
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213 deallocate_buffer(buf);
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214 return true; // In normal case, go on to next buffer.
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215 } else {
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216 enqueue_complete_buffer(buf, nd->index, true);
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217 return false;
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218 }
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219 } else {
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220 return false;
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221 }
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222 }
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223
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224 bool DirtyCardQueueSet::apply_closure_to_completed_buffer(int worker_i,
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225 int stop_at,
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226 bool with_CAS)
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227 {
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228 CompletedBufferNode* nd = NULL;
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229 if (with_CAS) {
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230 guarantee(stop_at == 0, "Precondition");
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231 nd = get_completed_buffer_CAS();
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232 } else {
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233 nd = get_completed_buffer_lock(stop_at);
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234 }
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235 bool res = apply_closure_to_completed_buffer_helper(worker_i, nd);
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236 if (res) _processed_buffers_rs_thread++;
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237 return res;
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238 }
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239
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240 void DirtyCardQueueSet::apply_closure_to_all_completed_buffers() {
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241 CompletedBufferNode* nd = _completed_buffers_head;
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242 while (nd != NULL) {
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243 bool b =
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244 DirtyCardQueue::apply_closure_to_buffer(_closure, nd->buf, 0, _sz,
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245 false);
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246 guarantee(b, "Should not stop early.");
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247 nd = nd->next;
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248 }
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249 }
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250
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251 void DirtyCardQueueSet::abandon_logs() {
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252 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint.");
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253 CompletedBufferNode* buffers_to_delete = NULL;
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254 {
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255 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag);
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256 while (_completed_buffers_head != NULL) {
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257 CompletedBufferNode* nd = _completed_buffers_head;
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258 _completed_buffers_head = nd->next;
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259 nd->next = buffers_to_delete;
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260 buffers_to_delete = nd;
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261 }
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262 _n_completed_buffers = 0;
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263 _completed_buffers_tail = NULL;
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264 debug_only(assert_completed_buffer_list_len_correct_locked());
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265 }
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266 while (buffers_to_delete != NULL) {
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267 CompletedBufferNode* nd = buffers_to_delete;
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268 buffers_to_delete = nd->next;
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269 deallocate_buffer(nd->buf);
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270 delete nd;
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271 }
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272 // Since abandon is done only at safepoints, we can safely manipulate
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273 // these queues.
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274 for (JavaThread* t = Threads::first(); t; t = t->next()) {
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275 t->dirty_card_queue().reset();
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276 }
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277 shared_dirty_card_queue()->reset();
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278 }
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279
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280
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281 void DirtyCardQueueSet::concatenate_logs() {
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282 // Iterate over all the threads, if we find a partial log add it to
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283 // the global list of logs. Temporarily turn off the limit on the number
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284 // of outstanding buffers.
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285 int save_max_completed_queue = _max_completed_queue;
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286 _max_completed_queue = max_jint;
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287 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint.");
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288 for (JavaThread* t = Threads::first(); t; t = t->next()) {
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289 DirtyCardQueue& dcq = t->dirty_card_queue();
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290 if (dcq.size() != 0) {
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291 void **buf = t->dirty_card_queue().get_buf();
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292 // We must NULL out the unused entries, then enqueue.
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293 for (size_t i = 0; i < t->dirty_card_queue().get_index(); i += oopSize) {
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294 buf[PtrQueue::byte_index_to_index((int)i)] = NULL;
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295 }
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296 enqueue_complete_buffer(dcq.get_buf(), dcq.get_index());
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297 dcq.reinitialize();
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298 }
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299 }
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300 if (_shared_dirty_card_queue.size() != 0) {
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301 enqueue_complete_buffer(_shared_dirty_card_queue.get_buf(),
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302 _shared_dirty_card_queue.get_index());
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303 _shared_dirty_card_queue.reinitialize();
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304 }
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305 // Restore the completed buffer queue limit.
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306 _max_completed_queue = save_max_completed_queue;
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307 }
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