Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/satbQueue.cpp @ 6615:09aad8452938
7190310: Inlining WeakReference.get(), and hoisting $referent may lead to non-terminating loops
Summary: In C2 add software membar after load from Reference.referent field to prevent commoning of loads across safepoint since GC can change its value. In C1 always generate Reference.get() intrinsic.
Reviewed-by: roland, twisti, dholmes, johnc
author | kvn |
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date | Mon, 20 Aug 2012 09:58:58 -0700 |
parents | d2a62e0f25eb |
children | 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" | |
30 #include "runtime/mutexLocker.hpp" | |
31 #include "runtime/thread.hpp" | |
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32 #include "runtime/vmThread.hpp" |
342 | 33 |
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34 void ObjPtrQueue::flush() { |
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35 // The buffer might contain refs into the CSet. We have to filter it |
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36 // first before we flush it, otherwise we might end up with an |
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37 // enqueued buffer with refs into the CSet which breaks our invariants. |
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38 filter(); |
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39 PtrQueue::flush(); |
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40 } |
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41 |
2149 | 42 // This method removes entries from an SATB buffer that will not be |
43 // useful to the concurrent marking threads. An entry is removed if it | |
44 // satisfies one of the following conditions: | |
45 // | |
46 // * it points to an object outside the G1 heap (G1's concurrent | |
47 // marking only visits objects inside the G1 heap), | |
48 // * it points to an object that has been allocated since marking | |
49 // started (according to SATB those objects do not need to be | |
50 // visited during marking), or | |
51 // * it points to an object that has already been marked (no need to | |
52 // process it again). | |
53 // | |
54 // The rest of the entries will be retained and are compacted towards | |
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55 // the top of the buffer. Note that, because we do not allow old |
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56 // regions in the CSet during marking, all objects on the CSet regions |
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57 // are young (eden or survivors) and therefore implicitly live. So any |
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58 // references into the CSet will be removed during filtering. |
2149 | 59 |
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60 void ObjPtrQueue::filter() { |
2149 | 61 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
62 void** buf = _buf; | |
63 size_t sz = _sz; | |
64 | |
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65 if (buf == NULL) { |
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66 // nothing to do |
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67 return; |
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68 } |
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69 |
2149 | 70 // Used for sanity checking at the end of the loop. |
71 debug_only(size_t entries = 0; size_t retained = 0;) | |
72 | |
73 size_t i = sz; | |
74 size_t new_index = sz; | |
75 | |
76 while (i > _index) { | |
77 assert(i > 0, "we should have at least one more entry to process"); | |
78 i -= oopSize; | |
79 debug_only(entries += 1;) | |
80 oop* p = (oop*) &buf[byte_index_to_index((int) i)]; | |
81 oop obj = *p; | |
82 // NULL the entry so that unused parts of the buffer contain NULLs | |
83 // at the end. If we are going to retain it we will copy it to its | |
84 // final place. If we have retained all entries we have visited so | |
85 // far, we'll just end up copying it to the same place. | |
86 *p = NULL; | |
87 | |
88 bool retain = g1h->is_obj_ill(obj); | |
89 if (retain) { | |
90 assert(new_index > 0, "we should not have already filled up the buffer"); | |
91 new_index -= oopSize; | |
92 assert(new_index >= i, | |
93 "new_index should never be below i, as we alwaysr compact 'up'"); | |
94 oop* new_p = (oop*) &buf[byte_index_to_index((int) new_index)]; | |
95 assert(new_p >= p, "the destination location should never be below " | |
96 "the source as we always compact 'up'"); | |
97 assert(*new_p == NULL, | |
98 "we should have already cleared the destination location"); | |
99 *new_p = obj; | |
100 debug_only(retained += 1;) | |
101 } | |
102 } | |
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103 |
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104 #ifdef ASSERT |
2149 | 105 size_t entries_calc = (sz - _index) / oopSize; |
106 assert(entries == entries_calc, "the number of entries we counted " | |
107 "should match the number of entries we calculated"); | |
108 size_t retained_calc = (sz - new_index) / oopSize; | |
109 assert(retained == retained_calc, "the number of retained entries we counted " | |
110 "should match the number of retained entries we calculated"); | |
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111 #endif // ASSERT |
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112 |
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113 _index = new_index; |
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114 } |
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115 |
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116 // This method will first apply the above filtering to the buffer. If |
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117 // post-filtering a large enough chunk of the buffer has been cleared |
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118 // we can re-use the buffer (instead of enqueueing it) and we can just |
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119 // allow the mutator to carry on executing using the same buffer |
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120 // instead of replacing it. |
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121 |
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122 bool ObjPtrQueue::should_enqueue_buffer() { |
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123 assert(_lock == NULL || _lock->owned_by_self(), |
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124 "we should have taken the lock before calling this"); |
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125 |
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126 // Even if G1SATBBufferEnqueueingThresholdPercent == 0 we have to |
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127 // filter the buffer given that this will remove any references into |
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128 // the CSet as we currently assume that no such refs will appear in |
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129 // enqueued buffers. |
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130 |
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131 // This method should only be called if there is a non-NULL buffer |
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132 // that is full. |
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133 assert(_index == 0, "pre-condition"); |
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134 assert(_buf != NULL, "pre-condition"); |
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135 |
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136 filter(); |
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137 |
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138 size_t sz = _sz; |
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139 size_t all_entries = sz / oopSize; |
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140 size_t retained_entries = (sz - _index) / oopSize; |
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141 size_t perc = retained_entries * 100 / all_entries; |
2149 | 142 bool should_enqueue = perc > (size_t) G1SATBBufferEnqueueingThresholdPercent; |
143 return should_enqueue; | |
144 } | |
145 | |
342 | 146 void ObjPtrQueue::apply_closure(ObjectClosure* cl) { |
147 if (_buf != NULL) { | |
148 apply_closure_to_buffer(cl, _buf, _index, _sz); | |
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149 } |
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150 } |
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151 |
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152 void ObjPtrQueue::apply_closure_and_empty(ObjectClosure* cl) { |
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153 if (_buf != NULL) { |
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154 apply_closure_to_buffer(cl, _buf, _index, _sz); |
342 | 155 _index = _sz; |
156 } | |
157 } | |
158 | |
159 void ObjPtrQueue::apply_closure_to_buffer(ObjectClosure* cl, | |
160 void** buf, size_t index, size_t sz) { | |
161 if (cl == NULL) return; | |
162 for (size_t i = index; i < sz; i += oopSize) { | |
163 oop obj = (oop)buf[byte_index_to_index((int)i)]; | |
164 // There can be NULL entries because of destructors. | |
165 if (obj != NULL) { | |
166 cl->do_object(obj); | |
167 } | |
168 } | |
169 } | |
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170 |
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171 #ifndef PRODUCT |
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172 // Helpful for debugging |
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173 |
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174 void ObjPtrQueue::print(const char* name) { |
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175 print(name, _buf, _index, _sz); |
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176 } |
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177 |
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178 void ObjPtrQueue::print(const char* name, |
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179 void** buf, size_t index, size_t sz) { |
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180 gclog_or_tty->print_cr(" SATB BUFFER [%s] buf: "PTR_FORMAT" " |
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181 "index: "SIZE_FORMAT" sz: "SIZE_FORMAT, |
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182 name, buf, index, sz); |
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183 } |
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184 #endif // PRODUCT |
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185 |
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186 #ifdef ASSERT |
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187 void ObjPtrQueue::verify_oops_in_buffer() { |
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188 if (_buf == NULL) return; |
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189 for (size_t i = _index; i < _sz; i += oopSize) { |
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190 oop obj = (oop)_buf[byte_index_to_index((int)i)]; |
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191 assert(obj != NULL && obj->is_oop(true /* ignore mark word */), |
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192 "Not an oop"); |
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193 } |
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194 } |
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195 #endif |
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196 |
342 | 197 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
198 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
199 #endif // _MSC_VER | |
200 | |
201 SATBMarkQueueSet::SATBMarkQueueSet() : | |
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202 PtrQueueSet(), _closure(NULL), _par_closures(NULL), |
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203 _shared_satb_queue(this, true /*perm*/) { } |
342 | 204 |
205 void SATBMarkQueueSet::initialize(Monitor* cbl_mon, Mutex* fl_lock, | |
1111 | 206 int process_completed_threshold, |
342 | 207 Mutex* lock) { |
1111 | 208 PtrQueueSet::initialize(cbl_mon, fl_lock, process_completed_threshold, -1); |
342 | 209 _shared_satb_queue.set_lock(lock); |
210 if (ParallelGCThreads > 0) { | |
6197 | 211 _par_closures = NEW_C_HEAP_ARRAY(ObjectClosure*, ParallelGCThreads, mtGC); |
342 | 212 } |
213 } | |
214 | |
215 void SATBMarkQueueSet::handle_zero_index_for_thread(JavaThread* t) { | |
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216 DEBUG_ONLY(t->satb_mark_queue().verify_oops_in_buffer();) |
342 | 217 t->satb_mark_queue().handle_zero_index(); |
218 } | |
219 | |
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220 #ifdef ASSERT |
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221 void SATBMarkQueueSet::dump_active_values(JavaThread* first, |
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222 bool expected_active) { |
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223 gclog_or_tty->print_cr("SATB queue active values for Java Threads"); |
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224 gclog_or_tty->print_cr(" SATB queue set: active is %s", |
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225 (is_active()) ? "TRUE" : "FALSE"); |
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226 gclog_or_tty->print_cr(" expected_active is %s", |
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227 (expected_active) ? "TRUE" : "FALSE"); |
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228 for (JavaThread* t = first; t; t = t->next()) { |
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229 bool active = t->satb_mark_queue().is_active(); |
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230 gclog_or_tty->print_cr(" thread %s, active is %s", |
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231 t->name(), (active) ? "TRUE" : "FALSE"); |
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232 } |
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233 } |
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234 #endif // ASSERT |
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235 |
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236 void SATBMarkQueueSet::set_active_all_threads(bool b, |
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237 bool expected_active) { |
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238 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); |
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239 JavaThread* first = Threads::first(); |
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240 |
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241 #ifdef ASSERT |
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242 if (_all_active != expected_active) { |
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243 dump_active_values(first, expected_active); |
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244 |
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245 // I leave this here as a guarantee, instead of an assert, so |
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246 // that it will still be compiled in if we choose to uncomment |
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247 // the #ifdef ASSERT in a product build. The whole block is |
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248 // within an #ifdef ASSERT so the guarantee will not be compiled |
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249 // in a product build anyway. |
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250 guarantee(false, |
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251 "SATB queue set has an unexpected active value"); |
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252 } |
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253 #endif // ASSERT |
342 | 254 _all_active = b; |
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255 |
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256 for (JavaThread* t = first; t; t = t->next()) { |
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257 #ifdef ASSERT |
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258 bool active = t->satb_mark_queue().is_active(); |
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259 if (active != expected_active) { |
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260 dump_active_values(first, expected_active); |
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261 |
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262 // I leave this here as a guarantee, instead of an assert, so |
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263 // that it will still be compiled in if we choose to uncomment |
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264 // the #ifdef ASSERT in a product build. The whole block is |
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265 // within an #ifdef ASSERT so the guarantee will not be compiled |
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266 // in a product build anyway. |
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267 guarantee(false, |
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268 "thread has an unexpected active value in its SATB queue"); |
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269 } |
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270 #endif // ASSERT |
342 | 271 t->satb_mark_queue().set_active(b); |
272 } | |
273 } | |
274 | |
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275 void SATBMarkQueueSet::filter_thread_buffers() { |
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276 for(JavaThread* t = Threads::first(); t; t = t->next()) { |
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277 t->satb_mark_queue().filter(); |
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278 } |
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279 shared_satb_queue()->filter(); |
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280 } |
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281 |
342 | 282 void SATBMarkQueueSet::set_closure(ObjectClosure* closure) { |
283 _closure = closure; | |
284 } | |
285 | |
286 void SATBMarkQueueSet::set_par_closure(int i, ObjectClosure* par_closure) { | |
287 assert(ParallelGCThreads > 0 && _par_closures != NULL, "Precondition"); | |
288 _par_closures[i] = par_closure; | |
289 } | |
290 | |
291 void SATBMarkQueueSet::iterate_closure_all_threads() { | |
292 for(JavaThread* t = Threads::first(); t; t = t->next()) { | |
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293 t->satb_mark_queue().apply_closure_and_empty(_closure); |
342 | 294 } |
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295 shared_satb_queue()->apply_closure_and_empty(_closure); |
342 | 296 } |
297 | |
298 void SATBMarkQueueSet::par_iterate_closure_all_threads(int worker) { | |
299 SharedHeap* sh = SharedHeap::heap(); | |
300 int parity = sh->strong_roots_parity(); | |
301 | |
302 for(JavaThread* t = Threads::first(); t; t = t->next()) { | |
303 if (t->claim_oops_do(true, parity)) { | |
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304 t->satb_mark_queue().apply_closure_and_empty(_par_closures[worker]); |
342 | 305 } |
306 } | |
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307 |
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308 // We also need to claim the VMThread so that its parity is updated |
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309 // otherwise the next call to Thread::possibly_parallel_oops_do inside |
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310 // a StrongRootsScope might skip the VMThread because it has a stale |
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311 // parity that matches the parity set by the StrongRootsScope |
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312 // |
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313 // Whichever worker succeeds in claiming the VMThread gets to do |
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314 // the shared queue. |
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315 |
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316 VMThread* vmt = VMThread::vm_thread(); |
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317 if (vmt->claim_oops_do(true, parity)) { |
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318 shared_satb_queue()->apply_closure_and_empty(_par_closures[worker]); |
342 | 319 } |
320 } | |
321 | |
322 bool SATBMarkQueueSet::apply_closure_to_completed_buffer_work(bool par, | |
323 int worker) { | |
1111 | 324 BufferNode* nd = NULL; |
342 | 325 { |
326 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); | |
327 if (_completed_buffers_head != NULL) { | |
328 nd = _completed_buffers_head; | |
1111 | 329 _completed_buffers_head = nd->next(); |
342 | 330 if (_completed_buffers_head == NULL) _completed_buffers_tail = NULL; |
331 _n_completed_buffers--; | |
332 if (_n_completed_buffers == 0) _process_completed = false; | |
333 } | |
334 } | |
335 ObjectClosure* cl = (par ? _par_closures[worker] : _closure); | |
336 if (nd != NULL) { | |
1111 | 337 void **buf = BufferNode::make_buffer_from_node(nd); |
338 ObjPtrQueue::apply_closure_to_buffer(cl, buf, 0, _sz); | |
339 deallocate_buffer(buf); | |
342 | 340 return true; |
341 } else { | |
342 return false; | |
343 } | |
344 } | |
345 | |
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346 void SATBMarkQueueSet::iterate_completed_buffers_read_only(ObjectClosure* cl) { |
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347 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); |
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348 assert(cl != NULL, "pre-condition"); |
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349 |
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350 BufferNode* nd = _completed_buffers_head; |
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351 while (nd != NULL) { |
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352 void** buf = BufferNode::make_buffer_from_node(nd); |
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353 ObjPtrQueue::apply_closure_to_buffer(cl, buf, 0, _sz); |
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354 nd = nd->next(); |
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355 } |
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356 } |
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357 |
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358 void SATBMarkQueueSet::iterate_thread_buffers_read_only(ObjectClosure* cl) { |
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359 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); |
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360 assert(cl != NULL, "pre-condition"); |
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361 |
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362 for (JavaThread* t = Threads::first(); t; t = t->next()) { |
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363 t->satb_mark_queue().apply_closure(cl); |
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364 } |
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365 shared_satb_queue()->apply_closure(cl); |
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366 } |
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367 |
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368 #ifndef PRODUCT |
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369 // Helpful for debugging |
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370 |
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371 #define SATB_PRINTER_BUFFER_SIZE 256 |
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372 |
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373 void SATBMarkQueueSet::print_all(const char* msg) { |
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374 char buffer[SATB_PRINTER_BUFFER_SIZE]; |
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375 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); |
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376 |
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377 gclog_or_tty->cr(); |
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378 gclog_or_tty->print_cr("SATB BUFFERS [%s]", msg); |
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379 |
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380 BufferNode* nd = _completed_buffers_head; |
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381 int i = 0; |
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382 while (nd != NULL) { |
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383 void** buf = BufferNode::make_buffer_from_node(nd); |
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384 jio_snprintf(buffer, SATB_PRINTER_BUFFER_SIZE, "Enqueued: %d", i); |
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385 ObjPtrQueue::print(buffer, buf, 0, _sz); |
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386 nd = nd->next(); |
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387 i += 1; |
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388 } |
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389 |
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390 for (JavaThread* t = Threads::first(); t; t = t->next()) { |
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391 jio_snprintf(buffer, SATB_PRINTER_BUFFER_SIZE, "Thread: %s", t->name()); |
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392 t->satb_mark_queue().print(buffer); |
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393 } |
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394 |
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395 shared_satb_queue()->print("Shared"); |
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396 |
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397 gclog_or_tty->cr(); |
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398 } |
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399 #endif // PRODUCT |
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400 |
342 | 401 void SATBMarkQueueSet::abandon_partial_marking() { |
1111 | 402 BufferNode* buffers_to_delete = NULL; |
342 | 403 { |
404 MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag); | |
405 while (_completed_buffers_head != NULL) { | |
1111 | 406 BufferNode* nd = _completed_buffers_head; |
407 _completed_buffers_head = nd->next(); | |
408 nd->set_next(buffers_to_delete); | |
342 | 409 buffers_to_delete = nd; |
410 } | |
411 _completed_buffers_tail = NULL; | |
412 _n_completed_buffers = 0; | |
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413 DEBUG_ONLY(assert_completed_buffer_list_len_correct_locked()); |
342 | 414 } |
415 while (buffers_to_delete != NULL) { | |
1111 | 416 BufferNode* nd = buffers_to_delete; |
417 buffers_to_delete = nd->next(); | |
418 deallocate_buffer(BufferNode::make_buffer_from_node(nd)); | |
342 | 419 } |
420 assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint."); | |
421 // So we can safely manipulate these queues. | |
422 for (JavaThread* t = Threads::first(); t; t = t->next()) { | |
423 t->satb_mark_queue().reset(); | |
424 } | |
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425 shared_satb_queue()->reset(); |
342 | 426 } |