Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/satbQueue.cpp @ 8090:2af22eb04623
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author | vladidan |
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date | Thu, 21 Feb 2013 09:08:04 -0800 |
parents | da91efe96a93 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
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. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
2149 | 26 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
1972 | 27 #include "gc_implementation/g1/satbQueue.hpp" |
28 #include "memory/allocation.inline.hpp" | |
29 #include "memory/sharedHeap.hpp" | |
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30 #include "oops/oop.inline.hpp" |
1972 | 31 #include "runtime/mutexLocker.hpp" |
32 #include "runtime/thread.hpp" | |
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33 #include "runtime/vmThread.hpp" |
342 | 34 |
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35 void ObjPtrQueue::flush() { |
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36 // The buffer might contain refs into the CSet. We have to filter it |
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37 // first before we flush it, otherwise we might end up with an |
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38 // enqueued buffer with refs into the CSet which breaks our invariants. |
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39 filter(); |
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40 PtrQueue::flush(); |
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41 } |
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42 |
2149 | 43 // This method removes entries from an SATB buffer that will not be |
44 // useful to the concurrent marking threads. An entry is removed if it | |
45 // satisfies one of the following conditions: | |
46 // | |
47 // * it points to an object outside the G1 heap (G1's concurrent | |
48 // marking only visits objects inside the G1 heap), | |
49 // * it points to an object that has been allocated since marking | |
50 // started (according to SATB those objects do not need to be | |
51 // visited during marking), or | |
52 // * it points to an object that has already been marked (no need to | |
53 // process it again). | |
54 // | |
55 // The rest of the entries will be retained and are compacted towards | |
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56 // the top of the buffer. Note that, because we do not allow old |
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57 // regions in the CSet during marking, all objects on the CSet regions |
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58 // are young (eden or survivors) and therefore implicitly live. So any |
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59 // references into the CSet will be removed during filtering. |
2149 | 60 |
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61 void ObjPtrQueue::filter() { |
2149 | 62 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
63 void** buf = _buf; | |
64 size_t sz = _sz; | |
65 | |
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66 if (buf == NULL) { |
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67 // nothing to do |
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68 return; |
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69 } |
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70 |
2149 | 71 // Used for sanity checking at the end of the loop. |
72 debug_only(size_t entries = 0; size_t retained = 0;) | |
73 | |
74 size_t i = sz; | |
75 size_t new_index = sz; | |
76 | |
77 while (i > _index) { | |
78 assert(i > 0, "we should have at least one more entry to process"); | |
79 i -= oopSize; | |
80 debug_only(entries += 1;) | |
81 oop* p = (oop*) &buf[byte_index_to_index((int) i)]; | |
82 oop obj = *p; | |
83 // NULL the entry so that unused parts of the buffer contain NULLs | |
84 // at the end. If we are going to retain it we will copy it to its | |
85 // final place. If we have retained all entries we have visited so | |
86 // far, we'll just end up copying it to the same place. | |
87 *p = NULL; | |
88 | |
89 bool retain = g1h->is_obj_ill(obj); | |
90 if (retain) { | |
91 assert(new_index > 0, "we should not have already filled up the buffer"); | |
92 new_index -= oopSize; | |
93 assert(new_index >= i, | |
94 "new_index should never be below i, as we alwaysr compact 'up'"); | |
95 oop* new_p = (oop*) &buf[byte_index_to_index((int) new_index)]; | |
96 assert(new_p >= p, "the destination location should never be below " | |
97 "the source as we always compact 'up'"); | |
98 assert(*new_p == NULL, | |
99 "we should have already cleared the destination location"); | |
100 *new_p = obj; | |
101 debug_only(retained += 1;) | |
102 } | |
103 } | |
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104 |
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105 #ifdef ASSERT |
2149 | 106 size_t entries_calc = (sz - _index) / oopSize; |
107 assert(entries == entries_calc, "the number of entries we counted " | |
108 "should match the number of entries we calculated"); | |
109 size_t retained_calc = (sz - new_index) / oopSize; | |
110 assert(retained == retained_calc, "the number of retained entries we counted " | |
111 "should match the number of retained entries we calculated"); | |
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112 #endif // ASSERT |
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113 |
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114 _index = new_index; |
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115 } |
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116 |
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117 // This method will first apply the above filtering to the buffer. If |
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118 // post-filtering a large enough chunk of the buffer has been cleared |
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119 // we can re-use the buffer (instead of enqueueing it) and we can just |
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120 // allow the mutator to carry on executing using the same buffer |
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121 // instead of replacing it. |
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122 |
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123 bool ObjPtrQueue::should_enqueue_buffer() { |
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124 assert(_lock == NULL || _lock->owned_by_self(), |
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125 "we should have taken the lock before calling this"); |
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126 |
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127 // Even if G1SATBBufferEnqueueingThresholdPercent == 0 we have to |
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128 // filter the buffer given that this will remove any references into |
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129 // the CSet as we currently assume that no such refs will appear in |
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130 // enqueued buffers. |
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131 |
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132 // This method should only be called if there is a non-NULL buffer |
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133 // that is full. |
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134 assert(_index == 0, "pre-condition"); |
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135 assert(_buf != NULL, "pre-condition"); |
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136 |
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137 filter(); |
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138 |
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139 size_t sz = _sz; |
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140 size_t all_entries = sz / oopSize; |
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141 size_t retained_entries = (sz - _index) / oopSize; |
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142 size_t perc = retained_entries * 100 / all_entries; |
2149 | 143 bool should_enqueue = perc > (size_t) G1SATBBufferEnqueueingThresholdPercent; |
144 return should_enqueue; | |
145 } | |
146 | |
342 | 147 void ObjPtrQueue::apply_closure(ObjectClosure* cl) { |
148 if (_buf != NULL) { | |
149 apply_closure_to_buffer(cl, _buf, _index, _sz); | |
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150 } |
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151 } |
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152 |
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153 void ObjPtrQueue::apply_closure_and_empty(ObjectClosure* cl) { |
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154 if (_buf != NULL) { |
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155 apply_closure_to_buffer(cl, _buf, _index, _sz); |
342 | 156 _index = _sz; |
157 } | |
158 } | |
159 | |
160 void ObjPtrQueue::apply_closure_to_buffer(ObjectClosure* cl, | |
161 void** buf, size_t index, size_t sz) { | |
162 if (cl == NULL) return; | |
163 for (size_t i = index; i < sz; i += oopSize) { | |
164 oop obj = (oop)buf[byte_index_to_index((int)i)]; | |
165 // There can be NULL entries because of destructors. | |
166 if (obj != NULL) { | |
167 cl->do_object(obj); | |
168 } | |
169 } | |
170 } | |
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171 |
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172 #ifndef PRODUCT |
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173 // Helpful for debugging |
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174 |
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175 void ObjPtrQueue::print(const char* name) { |
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176 print(name, _buf, _index, _sz); |
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177 } |
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178 |
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179 void ObjPtrQueue::print(const char* name, |
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180 void** buf, size_t index, size_t sz) { |
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181 gclog_or_tty->print_cr(" SATB BUFFER [%s] buf: "PTR_FORMAT" " |
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182 "index: "SIZE_FORMAT" sz: "SIZE_FORMAT, |
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183 name, buf, index, sz); |
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184 } |
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185 #endif // PRODUCT |
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186 |
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187 #ifdef ASSERT |
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188 void ObjPtrQueue::verify_oops_in_buffer() { |
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189 if (_buf == NULL) return; |
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190 for (size_t i = _index; i < _sz; i += oopSize) { |
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191 oop obj = (oop)_buf[byte_index_to_index((int)i)]; |
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192 assert(obj != NULL && obj->is_oop(true /* ignore mark word */), |
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193 "Not an oop"); |
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194 } |
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195 } |
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196 #endif |
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197 |
342 | 198 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
199 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
200 #endif // _MSC_VER | |
201 | |
202 SATBMarkQueueSet::SATBMarkQueueSet() : | |
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203 PtrQueueSet(), _closure(NULL), _par_closures(NULL), |
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204 _shared_satb_queue(this, true /*perm*/) { } |
342 | 205 |
206 void SATBMarkQueueSet::initialize(Monitor* cbl_mon, Mutex* fl_lock, | |
1111 | 207 int process_completed_threshold, |
342 | 208 Mutex* lock) { |
1111 | 209 PtrQueueSet::initialize(cbl_mon, fl_lock, process_completed_threshold, -1); |
342 | 210 _shared_satb_queue.set_lock(lock); |
211 if (ParallelGCThreads > 0) { | |
6197 | 212 _par_closures = NEW_C_HEAP_ARRAY(ObjectClosure*, ParallelGCThreads, mtGC); |
342 | 213 } |
214 } | |
215 | |
216 void SATBMarkQueueSet::handle_zero_index_for_thread(JavaThread* t) { | |
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217 DEBUG_ONLY(t->satb_mark_queue().verify_oops_in_buffer();) |
342 | 218 t->satb_mark_queue().handle_zero_index(); |
219 } | |
220 | |
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221 #ifdef ASSERT |
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222 void SATBMarkQueueSet::dump_active_values(JavaThread* first, |
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223 bool expected_active) { |
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224 gclog_or_tty->print_cr("SATB queue active values for Java Threads"); |
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225 gclog_or_tty->print_cr(" SATB queue set: active is %s", |
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226 (is_active()) ? "TRUE" : "FALSE"); |
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227 gclog_or_tty->print_cr(" expected_active is %s", |
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228 (expected_active) ? "TRUE" : "FALSE"); |
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229 for (JavaThread* t = first; t; t = t->next()) { |
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230 bool active = t->satb_mark_queue().is_active(); |
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231 gclog_or_tty->print_cr(" thread %s, active is %s", |
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232 t->name(), (active) ? "TRUE" : "FALSE"); |
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233 } |
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234 } |
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235 #endif // ASSERT |
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236 |
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237 void SATBMarkQueueSet::set_active_all_threads(bool b, |
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238 bool expected_active) { |
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239 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); |
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240 JavaThread* first = Threads::first(); |
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241 |
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242 #ifdef ASSERT |
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243 if (_all_active != expected_active) { |
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244 dump_active_values(first, expected_active); |
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245 |
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246 // I leave this here as a guarantee, instead of an assert, so |
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247 // that it will still be compiled in if we choose to uncomment |
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248 // the #ifdef ASSERT in a product build. The whole block is |
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249 // within an #ifdef ASSERT so the guarantee will not be compiled |
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250 // in a product build anyway. |
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251 guarantee(false, |
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252 "SATB queue set has an unexpected active value"); |
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253 } |
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254 #endif // ASSERT |
342 | 255 _all_active = b; |
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256 |
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257 for (JavaThread* t = first; t; t = t->next()) { |
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258 #ifdef ASSERT |
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259 bool active = t->satb_mark_queue().is_active(); |
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260 if (active != expected_active) { |
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261 dump_active_values(first, expected_active); |
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262 |
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263 // I leave this here as a guarantee, instead of an assert, so |
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264 // that it will still be compiled in if we choose to uncomment |
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265 // the #ifdef ASSERT in a product build. The whole block is |
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266 // within an #ifdef ASSERT so the guarantee will not be compiled |
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267 // in a product build anyway. |
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268 guarantee(false, |
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269 "thread has an unexpected active value in its SATB queue"); |
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270 } |
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271 #endif // ASSERT |
342 | 272 t->satb_mark_queue().set_active(b); |
273 } | |
274 } | |
275 | |
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276 void SATBMarkQueueSet::filter_thread_buffers() { |
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277 for(JavaThread* t = Threads::first(); t; t = t->next()) { |
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278 t->satb_mark_queue().filter(); |
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279 } |
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280 shared_satb_queue()->filter(); |
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281 } |
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282 |
342 | 283 void SATBMarkQueueSet::set_closure(ObjectClosure* closure) { |
284 _closure = closure; | |
285 } | |
286 | |
287 void SATBMarkQueueSet::set_par_closure(int i, ObjectClosure* par_closure) { | |
288 assert(ParallelGCThreads > 0 && _par_closures != NULL, "Precondition"); | |
289 _par_closures[i] = par_closure; | |
290 } | |
291 | |
292 void SATBMarkQueueSet::iterate_closure_all_threads() { | |
293 for(JavaThread* t = Threads::first(); t; t = t->next()) { | |
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294 t->satb_mark_queue().apply_closure_and_empty(_closure); |
342 | 295 } |
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296 shared_satb_queue()->apply_closure_and_empty(_closure); |
342 | 297 } |
298 | |
299 void SATBMarkQueueSet::par_iterate_closure_all_threads(int worker) { | |
300 SharedHeap* sh = SharedHeap::heap(); | |
301 int parity = sh->strong_roots_parity(); | |
302 | |
303 for(JavaThread* t = Threads::first(); t; t = t->next()) { | |
304 if (t->claim_oops_do(true, parity)) { | |
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305 t->satb_mark_queue().apply_closure_and_empty(_par_closures[worker]); |
342 | 306 } |
307 } | |
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308 |
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309 // We also need to claim the VMThread so that its parity is updated |
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310 // otherwise the next call to Thread::possibly_parallel_oops_do inside |
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311 // a StrongRootsScope might skip the VMThread because it has a stale |
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312 // parity that matches the parity set by the StrongRootsScope |
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313 // |
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314 // Whichever worker succeeds in claiming the VMThread gets to do |
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315 // the shared queue. |
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316 |
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317 VMThread* vmt = VMThread::vm_thread(); |
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318 if (vmt->claim_oops_do(true, parity)) { |
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319 shared_satb_queue()->apply_closure_and_empty(_par_closures[worker]); |
342 | 320 } |
321 } | |
322 | |
323 bool SATBMarkQueueSet::apply_closure_to_completed_buffer_work(bool par, | |
324 int worker) { | |
1111 | 325 BufferNode* nd = NULL; |
342 | 326 { |
327 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); | |
328 if (_completed_buffers_head != NULL) { | |
329 nd = _completed_buffers_head; | |
1111 | 330 _completed_buffers_head = nd->next(); |
342 | 331 if (_completed_buffers_head == NULL) _completed_buffers_tail = NULL; |
332 _n_completed_buffers--; | |
333 if (_n_completed_buffers == 0) _process_completed = false; | |
334 } | |
335 } | |
336 ObjectClosure* cl = (par ? _par_closures[worker] : _closure); | |
337 if (nd != NULL) { | |
1111 | 338 void **buf = BufferNode::make_buffer_from_node(nd); |
339 ObjPtrQueue::apply_closure_to_buffer(cl, buf, 0, _sz); | |
340 deallocate_buffer(buf); | |
342 | 341 return true; |
342 } else { | |
343 return false; | |
344 } | |
345 } | |
346 | |
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347 void SATBMarkQueueSet::iterate_completed_buffers_read_only(ObjectClosure* cl) { |
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348 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); |
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349 assert(cl != NULL, "pre-condition"); |
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350 |
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351 BufferNode* nd = _completed_buffers_head; |
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352 while (nd != NULL) { |
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353 void** buf = BufferNode::make_buffer_from_node(nd); |
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354 ObjPtrQueue::apply_closure_to_buffer(cl, buf, 0, _sz); |
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355 nd = nd->next(); |
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356 } |
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357 } |
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358 |
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359 void SATBMarkQueueSet::iterate_thread_buffers_read_only(ObjectClosure* cl) { |
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360 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); |
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361 assert(cl != NULL, "pre-condition"); |
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362 |
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363 for (JavaThread* t = Threads::first(); t; t = t->next()) { |
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364 t->satb_mark_queue().apply_closure(cl); |
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365 } |
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366 shared_satb_queue()->apply_closure(cl); |
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367 } |
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368 |
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369 #ifndef PRODUCT |
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370 // Helpful for debugging |
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371 |
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372 #define SATB_PRINTER_BUFFER_SIZE 256 |
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373 |
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374 void SATBMarkQueueSet::print_all(const char* msg) { |
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375 char buffer[SATB_PRINTER_BUFFER_SIZE]; |
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376 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); |
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377 |
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378 gclog_or_tty->cr(); |
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379 gclog_or_tty->print_cr("SATB BUFFERS [%s]", msg); |
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380 |
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381 BufferNode* nd = _completed_buffers_head; |
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382 int i = 0; |
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383 while (nd != NULL) { |
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384 void** buf = BufferNode::make_buffer_from_node(nd); |
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385 jio_snprintf(buffer, SATB_PRINTER_BUFFER_SIZE, "Enqueued: %d", i); |
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386 ObjPtrQueue::print(buffer, buf, 0, _sz); |
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387 nd = nd->next(); |
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388 i += 1; |
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389 } |
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390 |
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391 for (JavaThread* t = Threads::first(); t; t = t->next()) { |
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392 jio_snprintf(buffer, SATB_PRINTER_BUFFER_SIZE, "Thread: %s", t->name()); |
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393 t->satb_mark_queue().print(buffer); |
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394 } |
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395 |
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396 shared_satb_queue()->print("Shared"); |
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397 |
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398 gclog_or_tty->cr(); |
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399 } |
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400 #endif // PRODUCT |
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401 |
342 | 402 void SATBMarkQueueSet::abandon_partial_marking() { |
1111 | 403 BufferNode* buffers_to_delete = NULL; |
342 | 404 { |
405 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); | |
406 while (_completed_buffers_head != NULL) { | |
1111 | 407 BufferNode* nd = _completed_buffers_head; |
408 _completed_buffers_head = nd->next(); | |
409 nd->set_next(buffers_to_delete); | |
342 | 410 buffers_to_delete = nd; |
411 } | |
412 _completed_buffers_tail = NULL; | |
413 _n_completed_buffers = 0; | |
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414 DEBUG_ONLY(assert_completed_buffer_list_len_correct_locked()); |
342 | 415 } |
416 while (buffers_to_delete != NULL) { | |
1111 | 417 BufferNode* nd = buffers_to_delete; |
418 buffers_to_delete = nd->next(); | |
419 deallocate_buffer(BufferNode::make_buffer_from_node(nd)); | |
342 | 420 } |
421 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); | |
422 // So we can safely manipulate these queues. | |
423 for (JavaThread* t = Threads::first(); t; t = t->next()) { | |
424 t->satb_mark_queue().reset(); | |
425 } | |
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426 shared_satb_queue()->reset(); |
342 | 427 } |