Mercurial > hg > truffle
annotate src/share/vm/memory/referenceProcessor.cpp @ 21738:28943e5044b5
Merge
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Thu, 04 Jun 2015 19:49:45 -0700 |
parents | be896a1983c0 |
children | 12dcf5ba8b34 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
0 | 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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/javaClasses.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
10405 | 28 #include "gc_implementation/shared/gcTimer.hpp" |
29 #include "gc_implementation/shared/gcTraceTime.hpp" | |
1972 | 30 #include "gc_interface/collectedHeap.hpp" |
31 #include "gc_interface/collectedHeap.inline.hpp" | |
32 #include "memory/referencePolicy.hpp" | |
33 #include "memory/referenceProcessor.hpp" | |
34 #include "oops/oop.inline.hpp" | |
35 #include "runtime/java.hpp" | |
36 #include "runtime/jniHandles.hpp" | |
0 | 37 |
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38 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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39 |
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40 ReferencePolicy* ReferenceProcessor::_always_clear_soft_ref_policy = NULL; |
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41 ReferencePolicy* ReferenceProcessor::_default_soft_ref_policy = NULL; |
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42 bool ReferenceProcessor::_pending_list_uses_discovered_field = false; |
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43 jlong ReferenceProcessor::_soft_ref_timestamp_clock = 0; |
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44 |
0 | 45 void referenceProcessor_init() { |
46 ReferenceProcessor::init_statics(); | |
47 } | |
48 | |
49 void ReferenceProcessor::init_statics() { | |
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50 // We need a monotonically non-deccreasing time in ms but |
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51 // os::javaTimeMillis() does not guarantee monotonicity. |
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52 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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53 |
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54 // Initialize the soft ref timestamp clock. |
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55 _soft_ref_timestamp_clock = now; |
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56 // Also update the soft ref clock in j.l.r.SoftReference |
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57 java_lang_ref_SoftReference::set_clock(_soft_ref_timestamp_clock); |
0 | 58 |
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59 _always_clear_soft_ref_policy = new AlwaysClearPolicy(); |
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60 #if defined(COMPILER2) || defined(JVMCI) |
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61 _default_soft_ref_policy = new LRUMaxHeapPolicy(); |
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62 #else |
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63 _default_soft_ref_policy = new LRUCurrentHeapPolicy(); |
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64 #endif |
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65 if (_always_clear_soft_ref_policy == NULL || _default_soft_ref_policy == NULL) { |
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66 vm_exit_during_initialization("Could not allocate reference policy object"); |
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67 } |
0 | 68 guarantee(RefDiscoveryPolicy == ReferenceBasedDiscovery || |
69 RefDiscoveryPolicy == ReferentBasedDiscovery, | |
70 "Unrecongnized RefDiscoveryPolicy"); | |
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71 _pending_list_uses_discovered_field = JDK_Version::current().pending_list_uses_discovered_field(); |
0 | 72 } |
73 | |
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74 void ReferenceProcessor::enable_discovery(bool verify_disabled, bool check_no_refs) { |
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75 #ifdef ASSERT |
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76 // Verify that we're not currently discovering refs |
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77 assert(!verify_disabled || !_discovering_refs, "nested call?"); |
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78 |
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79 if (check_no_refs) { |
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80 // Verify that the discovered lists are empty |
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81 verify_no_references_recorded(); |
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82 } |
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83 #endif // ASSERT |
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84 |
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85 // Someone could have modified the value of the static |
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86 // field in the j.l.r.SoftReference class that holds the |
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87 // soft reference timestamp clock using reflection or |
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88 // Unsafe between GCs. Unconditionally update the static |
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89 // field in ReferenceProcessor here so that we use the new |
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90 // value during reference discovery. |
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91 |
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92 _soft_ref_timestamp_clock = java_lang_ref_SoftReference::clock(); |
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93 _discovering_refs = true; |
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94 } |
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95 |
0 | 96 ReferenceProcessor::ReferenceProcessor(MemRegion span, |
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97 bool mt_processing, |
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98 uint mt_processing_degree, |
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99 bool mt_discovery, |
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100 uint mt_discovery_degree, |
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101 bool atomic_discovery, |
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102 BoolObjectClosure* is_alive_non_header) : |
0 | 103 _discovering_refs(false), |
104 _enqueuing_is_done(false), | |
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105 _is_alive_non_header(is_alive_non_header), |
0 | 106 _processing_is_mt(mt_processing), |
107 _next_id(0) | |
108 { | |
109 _span = span; | |
110 _discovery_is_atomic = atomic_discovery; | |
111 _discovery_is_mt = mt_discovery; | |
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112 _num_q = MAX2(1U, mt_processing_degree); |
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113 _max_num_q = MAX2(_num_q, mt_discovery_degree); |
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114 _discovered_refs = NEW_C_HEAP_ARRAY(DiscoveredList, |
6197 | 115 _max_num_q * number_of_subclasses_of_ref(), mtGC); |
116 | |
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117 if (_discovered_refs == NULL) { |
0 | 118 vm_exit_during_initialization("Could not allocated RefProc Array"); |
119 } | |
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120 _discoveredSoftRefs = &_discovered_refs[0]; |
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121 _discoveredWeakRefs = &_discoveredSoftRefs[_max_num_q]; |
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122 _discoveredFinalRefs = &_discoveredWeakRefs[_max_num_q]; |
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123 _discoveredPhantomRefs = &_discoveredFinalRefs[_max_num_q]; |
20755 | 124 _discoveredCleanerRefs = &_discoveredPhantomRefs[_max_num_q]; |
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125 |
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126 // Initialize all entries to NULL |
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127 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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128 _discovered_refs[i].set_head(NULL); |
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129 _discovered_refs[i].set_length(0); |
0 | 130 } |
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131 |
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132 setup_policy(false /* default soft ref policy */); |
0 | 133 } |
134 | |
135 #ifndef PRODUCT | |
136 void ReferenceProcessor::verify_no_references_recorded() { | |
137 guarantee(!_discovering_refs, "Discovering refs?"); | |
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138 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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139 guarantee(_discovered_refs[i].is_empty(), |
0 | 140 "Found non-empty discovered list"); |
141 } | |
142 } | |
143 #endif | |
144 | |
145 void ReferenceProcessor::weak_oops_do(OopClosure* f) { | |
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146 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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147 if (UseCompressedOops) { |
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148 f->do_oop((narrowOop*)_discovered_refs[i].adr_head()); |
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149 } else { |
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150 f->do_oop((oop*)_discovered_refs[i].adr_head()); |
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151 } |
0 | 152 } |
153 } | |
154 | |
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155 void ReferenceProcessor::update_soft_ref_master_clock() { |
0 | 156 // Update (advance) the soft ref master clock field. This must be done |
157 // after processing the soft ref list. | |
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158 |
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159 // We need a monotonically non-deccreasing time in ms but |
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160 // os::javaTimeMillis() does not guarantee monotonicity. |
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161 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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162 jlong soft_ref_clock = java_lang_ref_SoftReference::clock(); |
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163 assert(soft_ref_clock == _soft_ref_timestamp_clock, "soft ref clocks out of sync"); |
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164 |
0 | 165 NOT_PRODUCT( |
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166 if (now < _soft_ref_timestamp_clock) { |
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167 warning("time warp: "INT64_FORMAT" to "INT64_FORMAT, |
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168 _soft_ref_timestamp_clock, now); |
0 | 169 } |
170 ) | |
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171 // The values of now and _soft_ref_timestamp_clock are set using |
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172 // javaTimeNanos(), which is guaranteed to be monotonically |
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173 // non-decreasing provided the underlying platform provides such |
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174 // a time source (and it is bug free). |
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175 // In product mode, however, protect ourselves from non-monotonicty. |
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176 if (now > _soft_ref_timestamp_clock) { |
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177 _soft_ref_timestamp_clock = now; |
0 | 178 java_lang_ref_SoftReference::set_clock(now); |
179 } | |
180 // Else leave clock stalled at its old value until time progresses | |
181 // past clock value. | |
182 } | |
183 | |
10405 | 184 size_t ReferenceProcessor::total_count(DiscoveredList lists[]) { |
185 size_t total = 0; | |
186 for (uint i = 0; i < _max_num_q; ++i) { | |
187 total += lists[i].length(); | |
188 } | |
189 return total; | |
190 } | |
191 | |
192 ReferenceProcessorStats ReferenceProcessor::process_discovered_references( | |
0 | 193 BoolObjectClosure* is_alive, |
194 OopClosure* keep_alive, | |
195 VoidClosure* complete_gc, | |
10405 | 196 AbstractRefProcTaskExecutor* task_executor, |
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197 GCTimer* gc_timer, |
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198 GCId gc_id) { |
0 | 199 NOT_PRODUCT(verify_ok_to_handle_reflists()); |
200 | |
201 assert(!enqueuing_is_done(), "If here enqueuing should not be complete"); | |
202 // Stop treating discovered references specially. | |
203 disable_discovery(); | |
204 | |
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205 // If discovery was concurrent, someone could have modified |
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206 // the value of the static field in the j.l.r.SoftReference |
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207 // class that holds the soft reference timestamp clock using |
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208 // reflection or Unsafe between when discovery was enabled and |
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209 // now. Unconditionally update the static field in ReferenceProcessor |
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210 // here so that we use the new value during processing of the |
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211 // discovered soft refs. |
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212 |
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213 _soft_ref_timestamp_clock = java_lang_ref_SoftReference::clock(); |
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214 |
0 | 215 bool trace_time = PrintGCDetails && PrintReferenceGC; |
10405 | 216 |
0 | 217 // Soft references |
10405 | 218 size_t soft_count = 0; |
0 | 219 { |
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220 GCTraceTime tt("SoftReference", trace_time, false, gc_timer, gc_id); |
10405 | 221 soft_count = |
222 process_discovered_reflist(_discoveredSoftRefs, _current_soft_ref_policy, true, | |
223 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 224 } |
225 | |
226 update_soft_ref_master_clock(); | |
227 | |
228 // Weak references | |
10405 | 229 size_t weak_count = 0; |
0 | 230 { |
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231 GCTraceTime tt("WeakReference", trace_time, false, gc_timer, gc_id); |
10405 | 232 weak_count = |
233 process_discovered_reflist(_discoveredWeakRefs, NULL, true, | |
234 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 235 } |
236 | |
237 // Final references | |
10405 | 238 size_t final_count = 0; |
0 | 239 { |
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240 GCTraceTime tt("FinalReference", trace_time, false, gc_timer, gc_id); |
10405 | 241 final_count = |
242 process_discovered_reflist(_discoveredFinalRefs, NULL, false, | |
243 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 244 } |
245 | |
246 // Phantom references | |
10405 | 247 size_t phantom_count = 0; |
0 | 248 { |
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249 GCTraceTime tt("PhantomReference", trace_time, false, gc_timer, gc_id); |
10405 | 250 phantom_count = |
251 process_discovered_reflist(_discoveredPhantomRefs, NULL, false, | |
252 is_alive, keep_alive, complete_gc, task_executor); | |
20755 | 253 |
254 // Process cleaners, but include them in phantom statistics. We expect | |
255 // Cleaner references to be temporary, and don't want to deal with | |
256 // possible incompatibilities arising from making it more visible. | |
257 phantom_count += | |
258 process_discovered_reflist(_discoveredCleanerRefs, NULL, false, | |
259 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 260 } |
261 | |
262 // Weak global JNI references. It would make more sense (semantically) to | |
263 // traverse these simultaneously with the regular weak references above, but | |
264 // that is not how the JDK1.2 specification is. See #4126360. Native code can | |
265 // thus use JNI weak references to circumvent the phantom references and | |
266 // resurrect a "post-mortem" object. | |
267 { | |
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268 GCTraceTime tt("JNI Weak Reference", trace_time, false, gc_timer, gc_id); |
0 | 269 if (task_executor != NULL) { |
270 task_executor->set_single_threaded_mode(); | |
271 } | |
272 process_phaseJNI(is_alive, keep_alive, complete_gc); | |
273 } | |
10405 | 274 |
275 return ReferenceProcessorStats(soft_count, weak_count, final_count, phantom_count); | |
0 | 276 } |
277 | |
278 #ifndef PRODUCT | |
279 // Calculate the number of jni handles. | |
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280 uint ReferenceProcessor::count_jni_refs() { |
0 | 281 class AlwaysAliveClosure: public BoolObjectClosure { |
282 public: | |
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283 virtual bool do_object_b(oop obj) { return true; } |
0 | 284 }; |
285 | |
286 class CountHandleClosure: public OopClosure { | |
287 private: | |
288 int _count; | |
289 public: | |
290 CountHandleClosure(): _count(0) {} | |
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291 void do_oop(oop* unused) { _count++; } |
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292 void do_oop(narrowOop* unused) { ShouldNotReachHere(); } |
0 | 293 int count() { return _count; } |
294 }; | |
295 CountHandleClosure global_handle_count; | |
296 AlwaysAliveClosure always_alive; | |
297 JNIHandles::weak_oops_do(&always_alive, &global_handle_count); | |
298 return global_handle_count.count(); | |
299 } | |
300 #endif | |
301 | |
302 void ReferenceProcessor::process_phaseJNI(BoolObjectClosure* is_alive, | |
303 OopClosure* keep_alive, | |
304 VoidClosure* complete_gc) { | |
305 #ifndef PRODUCT | |
306 if (PrintGCDetails && PrintReferenceGC) { | |
307 unsigned int count = count_jni_refs(); | |
308 gclog_or_tty->print(", %u refs", count); | |
309 } | |
310 #endif | |
311 JNIHandles::weak_oops_do(is_alive, keep_alive); | |
312 complete_gc->do_void(); | |
313 } | |
314 | |
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315 |
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316 template <class T> |
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317 bool enqueue_discovered_ref_helper(ReferenceProcessor* ref, |
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318 AbstractRefProcTaskExecutor* task_executor) { |
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319 |
0 | 320 // Remember old value of pending references list |
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321 T* pending_list_addr = (T*)java_lang_ref_Reference::pending_list_addr(); |
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322 T old_pending_list_value = *pending_list_addr; |
0 | 323 |
324 // Enqueue references that are not made active again, and | |
325 // clear the decks for the next collection (cycle). | |
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326 ref->enqueue_discovered_reflists((HeapWord*)pending_list_addr, task_executor); |
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327 // Do the post-barrier on pending_list_addr missed in |
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328 // enqueue_discovered_reflist. |
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329 oopDesc::bs()->write_ref_field(pending_list_addr, oopDesc::load_decode_heap_oop(pending_list_addr)); |
0 | 330 |
331 // Stop treating discovered references specially. | |
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332 ref->disable_discovery(); |
0 | 333 |
334 // Return true if new pending references were added | |
335 return old_pending_list_value != *pending_list_addr; | |
336 } | |
337 | |
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338 bool ReferenceProcessor::enqueue_discovered_references(AbstractRefProcTaskExecutor* task_executor) { |
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339 NOT_PRODUCT(verify_ok_to_handle_reflists()); |
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340 if (UseCompressedOops) { |
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341 return enqueue_discovered_ref_helper<narrowOop>(this, task_executor); |
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342 } else { |
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343 return enqueue_discovered_ref_helper<oop>(this, task_executor); |
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344 } |
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345 } |
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346 |
0 | 347 void ReferenceProcessor::enqueue_discovered_reflist(DiscoveredList& refs_list, |
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348 HeapWord* pending_list_addr) { |
0 | 349 // Given a list of refs linked through the "discovered" field |
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350 // (java.lang.ref.Reference.discovered), self-loop their "next" field |
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351 // thus distinguishing them from active References, then |
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352 // prepend them to the pending list. |
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353 // |
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354 // The Java threads will see the Reference objects linked together through |
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355 // the discovered field. Instead of trying to do the write barrier updates |
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356 // in all places in the reference processor where we manipulate the discovered |
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357 // field we make sure to do the barrier here where we anyway iterate through |
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358 // all linked Reference objects. Note that it is important to not dirty any |
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359 // cards during reference processing since this will cause card table |
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360 // verification to fail for G1. |
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361 // |
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362 // BKWRD COMPATIBILITY NOTE: For older JDKs (prior to the fix for 4956777), |
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363 // the "next" field is used to chain the pending list, not the discovered |
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364 // field. |
0 | 365 if (TraceReferenceGC && PrintGCDetails) { |
366 gclog_or_tty->print_cr("ReferenceProcessor::enqueue_discovered_reflist list " | |
367 INTPTR_FORMAT, (address)refs_list.head()); | |
368 } | |
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369 |
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370 oop obj = NULL; |
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371 oop next_d = refs_list.head(); |
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372 if (pending_list_uses_discovered_field()) { // New behavior |
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373 // Walk down the list, self-looping the next field |
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374 // so that the References are not considered active. |
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375 while (obj != next_d) { |
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376 obj = next_d; |
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377 assert(obj->is_instanceRef(), "should be reference object"); |
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378 next_d = java_lang_ref_Reference::discovered(obj); |
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379 if (TraceReferenceGC && PrintGCDetails) { |
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380 gclog_or_tty->print_cr(" obj " INTPTR_FORMAT "/next_d " INTPTR_FORMAT, |
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381 (void *)obj, (void *)next_d); |
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382 } |
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383 assert(java_lang_ref_Reference::next(obj) == NULL, |
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384 "Reference not active; should not be discovered"); |
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385 // Self-loop next, so as to make Ref not active. |
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386 java_lang_ref_Reference::set_next_raw(obj, obj); |
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387 if (next_d != obj) { |
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388 oopDesc::bs()->write_ref_field(java_lang_ref_Reference::discovered_addr(obj), next_d); |
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389 } else { |
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390 // This is the last object. |
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391 // Swap refs_list into pending_list_addr and |
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392 // set obj's discovered to what we read from pending_list_addr. |
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393 oop old = oopDesc::atomic_exchange_oop(refs_list.head(), pending_list_addr); |
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394 // Need post-barrier on pending_list_addr. See enqueue_discovered_ref_helper() above. |
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395 java_lang_ref_Reference::set_discovered_raw(obj, old); // old may be NULL |
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396 oopDesc::bs()->write_ref_field(java_lang_ref_Reference::discovered_addr(obj), old); |
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397 } |
0 | 398 } |
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399 } else { // Old behaviour |
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400 // Walk down the list, copying the discovered field into |
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401 // the next field and clearing the discovered field. |
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402 while (obj != next_d) { |
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403 obj = next_d; |
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404 assert(obj->is_instanceRef(), "should be reference object"); |
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405 next_d = java_lang_ref_Reference::discovered(obj); |
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406 if (TraceReferenceGC && PrintGCDetails) { |
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407 gclog_or_tty->print_cr(" obj " INTPTR_FORMAT "/next_d " INTPTR_FORMAT, |
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408 (void *)obj, (void *)next_d); |
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409 } |
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410 assert(java_lang_ref_Reference::next(obj) == NULL, |
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411 "The reference should not be enqueued"); |
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412 if (next_d == obj) { // obj is last |
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413 // Swap refs_list into pendling_list_addr and |
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414 // set obj's next to what we read from pending_list_addr. |
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415 oop old = oopDesc::atomic_exchange_oop(refs_list.head(), pending_list_addr); |
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416 // Need oop_check on pending_list_addr above; |
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417 // see special oop-check code at the end of |
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418 // enqueue_discovered_reflists() further below. |
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419 if (old == NULL) { |
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420 // obj should be made to point to itself, since |
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421 // pending list was empty. |
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422 java_lang_ref_Reference::set_next(obj, obj); |
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423 } else { |
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424 java_lang_ref_Reference::set_next(obj, old); |
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425 } |
0 | 426 } else { |
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427 java_lang_ref_Reference::set_next(obj, next_d); |
0 | 428 } |
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429 java_lang_ref_Reference::set_discovered(obj, (oop) NULL); |
0 | 430 } |
431 } | |
432 } | |
433 | |
434 // Parallel enqueue task | |
435 class RefProcEnqueueTask: public AbstractRefProcTaskExecutor::EnqueueTask { | |
436 public: | |
437 RefProcEnqueueTask(ReferenceProcessor& ref_processor, | |
438 DiscoveredList discovered_refs[], | |
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439 HeapWord* pending_list_addr, |
0 | 440 int n_queues) |
441 : EnqueueTask(ref_processor, discovered_refs, | |
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442 pending_list_addr, n_queues) |
0 | 443 { } |
444 | |
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445 virtual void work(unsigned int work_id) { |
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446 assert(work_id < (unsigned int)_ref_processor.max_num_q(), "Index out-of-bounds"); |
0 | 447 // Simplest first cut: static partitioning. |
448 int index = work_id; | |
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449 // The increment on "index" must correspond to the maximum number of queues |
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450 // (n_queues) with which that ReferenceProcessor was created. That |
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451 // is because of the "clever" way the discovered references lists were |
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452 // allocated and are indexed into. |
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453 assert(_n_queues == (int) _ref_processor.max_num_q(), "Different number not expected"); |
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454 for (int j = 0; |
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455 j < ReferenceProcessor::number_of_subclasses_of_ref(); |
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456 j++, index += _n_queues) { |
0 | 457 _ref_processor.enqueue_discovered_reflist( |
458 _refs_lists[index], _pending_list_addr); | |
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459 _refs_lists[index].set_head(NULL); |
0 | 460 _refs_lists[index].set_length(0); |
461 } | |
462 } | |
463 }; | |
464 | |
465 // Enqueue references that are not made active again | |
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466 void ReferenceProcessor::enqueue_discovered_reflists(HeapWord* pending_list_addr, |
0 | 467 AbstractRefProcTaskExecutor* task_executor) { |
468 if (_processing_is_mt && task_executor != NULL) { | |
469 // Parallel code | |
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470 RefProcEnqueueTask tsk(*this, _discovered_refs, |
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471 pending_list_addr, _max_num_q); |
0 | 472 task_executor->execute(tsk); |
473 } else { | |
474 // Serial code: call the parent class's implementation | |
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475 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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476 enqueue_discovered_reflist(_discovered_refs[i], pending_list_addr); |
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477 _discovered_refs[i].set_head(NULL); |
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478 _discovered_refs[i].set_length(0); |
0 | 479 } |
480 } | |
481 } | |
482 | |
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483 void DiscoveredListIterator::load_ptrs(DEBUG_ONLY(bool allow_null_referent)) { |
0 | 484 _discovered_addr = java_lang_ref_Reference::discovered_addr(_ref); |
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485 oop discovered = java_lang_ref_Reference::discovered(_ref); |
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486 assert(_discovered_addr && discovered->is_oop_or_null(), |
0 | 487 "discovered field is bad"); |
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488 _next = discovered; |
0 | 489 _referent_addr = java_lang_ref_Reference::referent_addr(_ref); |
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490 _referent = java_lang_ref_Reference::referent(_ref); |
0 | 491 assert(Universe::heap()->is_in_reserved_or_null(_referent), |
492 "Wrong oop found in java.lang.Reference object"); | |
493 assert(allow_null_referent ? | |
494 _referent->is_oop_or_null() | |
495 : _referent->is_oop(), | |
496 "bad referent"); | |
497 } | |
498 | |
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499 void DiscoveredListIterator::remove() { |
0 | 500 assert(_ref->is_oop(), "Dropping a bad reference"); |
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501 oop_store_raw(_discovered_addr, NULL); |
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502 |
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503 // First _prev_next ref actually points into DiscoveredList (gross). |
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504 oop new_next; |
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505 if (_next == _ref) { |
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506 // At the end of the list, we should make _prev point to itself. |
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507 // If _ref is the first ref, then _prev_next will be in the DiscoveredList, |
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508 // and _prev will be NULL. |
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509 new_next = _prev; |
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510 } else { |
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511 new_next = _next; |
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512 } |
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513 // Remove Reference object from discovered list. Note that G1 does not need a |
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514 // pre-barrier here because we know the Reference has already been found/marked, |
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515 // that's how it ended up in the discovered list in the first place. |
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516 oop_store_raw(_prev_next, new_next); |
0 | 517 NOT_PRODUCT(_removed++); |
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518 _refs_list.dec_length(1); |
0 | 519 } |
520 | |
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521 // Make the Reference object active again. |
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522 void DiscoveredListIterator::make_active() { |
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523 // The pre barrier for G1 is probably just needed for the old |
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524 // reference processing behavior. Should we guard this with |
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525 // ReferenceProcessor::pending_list_uses_discovered_field() ? |
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526 if (UseG1GC) { |
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527 HeapWord* next_addr = java_lang_ref_Reference::next_addr(_ref); |
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528 if (UseCompressedOops) { |
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529 oopDesc::bs()->write_ref_field_pre((narrowOop*)next_addr, NULL); |
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530 } else { |
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531 oopDesc::bs()->write_ref_field_pre((oop*)next_addr, NULL); |
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532 } |
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533 } |
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534 java_lang_ref_Reference::set_next_raw(_ref, NULL); |
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535 } |
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536 |
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537 void DiscoveredListIterator::clear_referent() { |
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538 oop_store_raw(_referent_addr, NULL); |
0 | 539 } |
540 | |
541 // NOTE: process_phase*() are largely similar, and at a high level | |
542 // merely iterate over the extant list applying a predicate to | |
543 // each of its elements and possibly removing that element from the | |
544 // list and applying some further closures to that element. | |
545 // We should consider the possibility of replacing these | |
546 // process_phase*() methods by abstracting them into | |
547 // a single general iterator invocation that receives appropriate | |
548 // closures that accomplish this work. | |
549 | |
550 // (SoftReferences only) Traverse the list and remove any SoftReferences whose | |
551 // referents are not alive, but that should be kept alive for policy reasons. | |
552 // Keep alive the transitive closure of all such referents. | |
553 void | |
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554 ReferenceProcessor::process_phase1(DiscoveredList& refs_list, |
0 | 555 ReferencePolicy* policy, |
556 BoolObjectClosure* is_alive, | |
557 OopClosure* keep_alive, | |
558 VoidClosure* complete_gc) { | |
559 assert(policy != NULL, "Must have a non-NULL policy"); | |
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560 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 561 // Decide which softly reachable refs should be kept alive. |
562 while (iter.has_next()) { | |
563 iter.load_ptrs(DEBUG_ONLY(!discovery_is_atomic() /* allow_null_referent */)); | |
564 bool referent_is_dead = (iter.referent() != NULL) && !iter.is_referent_alive(); | |
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565 if (referent_is_dead && |
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566 !policy->should_clear_reference(iter.obj(), _soft_ref_timestamp_clock)) { |
0 | 567 if (TraceReferenceGC) { |
568 gclog_or_tty->print_cr("Dropping reference (" INTPTR_FORMAT ": %s" ") by policy", | |
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569 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 570 } |
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571 // Remove Reference object from list |
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572 iter.remove(); |
0 | 573 // Make the Reference object active again |
574 iter.make_active(); | |
575 // keep the referent around | |
576 iter.make_referent_alive(); | |
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577 iter.move_to_next(); |
0 | 578 } else { |
579 iter.next(); | |
580 } | |
581 } | |
582 // Close the reachable set | |
583 complete_gc->do_void(); | |
584 NOT_PRODUCT( | |
585 if (PrintGCDetails && TraceReferenceGC) { | |
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586 gclog_or_tty->print_cr(" Dropped %d dead Refs out of %d " |
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587 "discovered Refs by policy, from list " INTPTR_FORMAT, |
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588 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 589 } |
590 ) | |
591 } | |
592 | |
593 // Traverse the list and remove any Refs that are not active, or | |
594 // whose referents are either alive or NULL. | |
595 void | |
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596 ReferenceProcessor::pp2_work(DiscoveredList& refs_list, |
0 | 597 BoolObjectClosure* is_alive, |
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598 OopClosure* keep_alive) { |
0 | 599 assert(discovery_is_atomic(), "Error"); |
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600 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 601 while (iter.has_next()) { |
602 iter.load_ptrs(DEBUG_ONLY(false /* allow_null_referent */)); | |
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603 DEBUG_ONLY(oop next = java_lang_ref_Reference::next(iter.obj());) |
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604 assert(next == NULL, "Should not discover inactive Reference"); |
0 | 605 if (iter.is_referent_alive()) { |
606 if (TraceReferenceGC) { | |
607 gclog_or_tty->print_cr("Dropping strongly reachable reference (" INTPTR_FORMAT ": %s)", | |
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608 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 609 } |
610 // The referent is reachable after all. | |
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611 // Remove Reference object from list. |
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612 iter.remove(); |
0 | 613 // Update the referent pointer as necessary: Note that this |
614 // should not entail any recursive marking because the | |
615 // referent must already have been traversed. | |
616 iter.make_referent_alive(); | |
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617 iter.move_to_next(); |
0 | 618 } else { |
619 iter.next(); | |
620 } | |
621 } | |
622 NOT_PRODUCT( | |
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623 if (PrintGCDetails && TraceReferenceGC && (iter.processed() > 0)) { |
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624 gclog_or_tty->print_cr(" Dropped %d active Refs out of %d " |
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625 "Refs in discovered list " INTPTR_FORMAT, |
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626 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 627 } |
628 ) | |
629 } | |
630 | |
631 void | |
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632 ReferenceProcessor::pp2_work_concurrent_discovery(DiscoveredList& refs_list, |
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633 BoolObjectClosure* is_alive, |
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634 OopClosure* keep_alive, |
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635 VoidClosure* complete_gc) { |
0 | 636 assert(!discovery_is_atomic(), "Error"); |
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637 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 638 while (iter.has_next()) { |
639 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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640 HeapWord* next_addr = java_lang_ref_Reference::next_addr(iter.obj()); |
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641 oop next = java_lang_ref_Reference::next(iter.obj()); |
0 | 642 if ((iter.referent() == NULL || iter.is_referent_alive() || |
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643 next != NULL)) { |
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644 assert(next->is_oop_or_null(), "bad next field"); |
0 | 645 // Remove Reference object from list |
646 iter.remove(); | |
647 // Trace the cohorts | |
648 iter.make_referent_alive(); | |
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649 if (UseCompressedOops) { |
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650 keep_alive->do_oop((narrowOop*)next_addr); |
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651 } else { |
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652 keep_alive->do_oop((oop*)next_addr); |
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653 } |
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654 iter.move_to_next(); |
0 | 655 } else { |
656 iter.next(); | |
657 } | |
658 } | |
659 // Now close the newly reachable set | |
660 complete_gc->do_void(); | |
661 NOT_PRODUCT( | |
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662 if (PrintGCDetails && TraceReferenceGC && (iter.processed() > 0)) { |
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663 gclog_or_tty->print_cr(" Dropped %d active Refs out of %d " |
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664 "Refs in discovered list " INTPTR_FORMAT, |
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665 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 666 } |
667 ) | |
668 } | |
669 | |
670 // Traverse the list and process the referents, by either | |
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671 // clearing them or keeping them (and their reachable |
0 | 672 // closure) alive. |
673 void | |
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674 ReferenceProcessor::process_phase3(DiscoveredList& refs_list, |
0 | 675 bool clear_referent, |
676 BoolObjectClosure* is_alive, | |
677 OopClosure* keep_alive, | |
678 VoidClosure* complete_gc) { | |
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679 ResourceMark rm; |
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680 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 681 while (iter.has_next()) { |
682 iter.update_discovered(); | |
683 iter.load_ptrs(DEBUG_ONLY(false /* allow_null_referent */)); | |
684 if (clear_referent) { | |
685 // NULL out referent pointer | |
686 iter.clear_referent(); | |
687 } else { | |
688 // keep the referent around | |
689 iter.make_referent_alive(); | |
690 } | |
691 if (TraceReferenceGC) { | |
692 gclog_or_tty->print_cr("Adding %sreference (" INTPTR_FORMAT ": %s) as pending", | |
693 clear_referent ? "cleared " : "", | |
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694 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 695 } |
696 assert(iter.obj()->is_oop(UseConcMarkSweepGC), "Adding a bad reference"); | |
697 iter.next(); | |
698 } | |
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699 // Remember to update the next pointer of the last ref. |
0 | 700 iter.update_discovered(); |
701 // Close the reachable set | |
702 complete_gc->do_void(); | |
703 } | |
704 | |
705 void | |
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706 ReferenceProcessor::clear_discovered_references(DiscoveredList& refs_list) { |
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707 oop obj = NULL; |
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708 oop next = refs_list.head(); |
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709 while (next != obj) { |
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710 obj = next; |
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711 next = java_lang_ref_Reference::discovered(obj); |
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712 java_lang_ref_Reference::set_discovered_raw(obj, NULL); |
0 | 713 } |
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714 refs_list.set_head(NULL); |
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715 refs_list.set_length(0); |
0 | 716 } |
717 | |
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718 void |
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719 ReferenceProcessor::abandon_partial_discovered_list(DiscoveredList& refs_list) { |
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720 clear_discovered_references(refs_list); |
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721 } |
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722 |
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723 void ReferenceProcessor::abandon_partial_discovery() { |
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724 // loop over the lists |
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725 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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726 if (TraceReferenceGC && PrintGCDetails && ((i % _max_num_q) == 0)) { |
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727 gclog_or_tty->print_cr("\nAbandoning %s discovered list", list_name(i)); |
342
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728 } |
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729 abandon_partial_discovered_list(_discovered_refs[i]); |
0 | 730 } |
731 } | |
732 | |
733 class RefProcPhase1Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
734 public: | |
735 RefProcPhase1Task(ReferenceProcessor& ref_processor, | |
736 DiscoveredList refs_lists[], | |
737 ReferencePolicy* policy, | |
738 bool marks_oops_alive) | |
739 : ProcessTask(ref_processor, refs_lists, marks_oops_alive), | |
740 _policy(policy) | |
741 { } | |
742 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
743 OopClosure& keep_alive, | |
744 VoidClosure& complete_gc) | |
745 { | |
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746 Thread* thr = Thread::current(); |
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747 int refs_list_index = ((WorkerThread*)thr)->id(); |
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748 _ref_processor.process_phase1(_refs_lists[refs_list_index], _policy, |
0 | 749 &is_alive, &keep_alive, &complete_gc); |
750 } | |
751 private: | |
752 ReferencePolicy* _policy; | |
753 }; | |
754 | |
755 class RefProcPhase2Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
756 public: | |
757 RefProcPhase2Task(ReferenceProcessor& ref_processor, | |
758 DiscoveredList refs_lists[], | |
759 bool marks_oops_alive) | |
760 : ProcessTask(ref_processor, refs_lists, marks_oops_alive) | |
761 { } | |
762 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
763 OopClosure& keep_alive, | |
764 VoidClosure& complete_gc) | |
765 { | |
766 _ref_processor.process_phase2(_refs_lists[i], | |
767 &is_alive, &keep_alive, &complete_gc); | |
768 } | |
769 }; | |
770 | |
771 class RefProcPhase3Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
772 public: | |
773 RefProcPhase3Task(ReferenceProcessor& ref_processor, | |
774 DiscoveredList refs_lists[], | |
775 bool clear_referent, | |
776 bool marks_oops_alive) | |
777 : ProcessTask(ref_processor, refs_lists, marks_oops_alive), | |
778 _clear_referent(clear_referent) | |
779 { } | |
780 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
781 OopClosure& keep_alive, | |
782 VoidClosure& complete_gc) | |
783 { | |
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784 // Don't use "refs_list_index" calculated in this way because |
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785 // balance_queues() has moved the Ref's into the first n queues. |
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786 // Thread* thr = Thread::current(); |
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787 // int refs_list_index = ((WorkerThread*)thr)->id(); |
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788 // _ref_processor.process_phase3(_refs_lists[refs_list_index], _clear_referent, |
0 | 789 _ref_processor.process_phase3(_refs_lists[i], _clear_referent, |
790 &is_alive, &keep_alive, &complete_gc); | |
791 } | |
792 private: | |
793 bool _clear_referent; | |
794 }; | |
795 | |
796 // Balances reference queues. | |
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797 // Move entries from all queues[0, 1, ..., _max_num_q-1] to |
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798 // queues[0, 1, ..., _num_q-1] because only the first _num_q |
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799 // corresponding to the active workers will be processed. |
0 | 800 void ReferenceProcessor::balance_queues(DiscoveredList ref_lists[]) |
801 { | |
802 // calculate total length | |
803 size_t total_refs = 0; | |
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804 if (TraceReferenceGC && PrintGCDetails) { |
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805 gclog_or_tty->print_cr("\nBalance ref_lists "); |
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806 } |
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807 |
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808 for (uint i = 0; i < _max_num_q; ++i) { |
0 | 809 total_refs += ref_lists[i].length(); |
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810 if (TraceReferenceGC && PrintGCDetails) { |
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811 gclog_or_tty->print("%d ", ref_lists[i].length()); |
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812 } |
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813 } |
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814 if (TraceReferenceGC && PrintGCDetails) { |
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815 gclog_or_tty->print_cr(" = %d", total_refs); |
0 | 816 } |
817 size_t avg_refs = total_refs / _num_q + 1; | |
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818 uint to_idx = 0; |
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819 for (uint from_idx = 0; from_idx < _max_num_q; from_idx++) { |
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820 bool move_all = false; |
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821 if (from_idx >= _num_q) { |
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822 move_all = ref_lists[from_idx].length() > 0; |
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823 } |
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824 while ((ref_lists[from_idx].length() > avg_refs) || |
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825 move_all) { |
0 | 826 assert(to_idx < _num_q, "Sanity Check!"); |
827 if (ref_lists[to_idx].length() < avg_refs) { | |
828 // move superfluous refs | |
1833
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829 size_t refs_to_move; |
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830 // Move all the Ref's if the from queue will not be processed. |
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831 if (move_all) { |
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832 refs_to_move = MIN2(ref_lists[from_idx].length(), |
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833 avg_refs - ref_lists[to_idx].length()); |
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834 } else { |
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835 refs_to_move = MIN2(ref_lists[from_idx].length() - avg_refs, |
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836 avg_refs - ref_lists[to_idx].length()); |
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837 } |
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838 |
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839 assert(refs_to_move > 0, "otherwise the code below will fail"); |
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840 |
0 | 841 oop move_head = ref_lists[from_idx].head(); |
842 oop move_tail = move_head; | |
843 oop new_head = move_head; | |
844 // find an element to split the list on | |
845 for (size_t j = 0; j < refs_to_move; ++j) { | |
846 move_tail = new_head; | |
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847 new_head = java_lang_ref_Reference::discovered(new_head); |
0 | 848 } |
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849 |
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850 // Add the chain to the to list. |
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851 if (ref_lists[to_idx].head() == NULL) { |
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852 // to list is empty. Make a loop at the end. |
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853 java_lang_ref_Reference::set_discovered_raw(move_tail, move_tail); |
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854 } else { |
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855 java_lang_ref_Reference::set_discovered_raw(move_tail, ref_lists[to_idx].head()); |
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856 } |
0 | 857 ref_lists[to_idx].set_head(move_head); |
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858 ref_lists[to_idx].inc_length(refs_to_move); |
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859 |
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860 // Remove the chain from the from list. |
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861 if (move_tail == new_head) { |
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862 // We found the end of the from list. |
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863 ref_lists[from_idx].set_head(NULL); |
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864 } else { |
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865 ref_lists[from_idx].set_head(new_head); |
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866 } |
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867 ref_lists[from_idx].dec_length(refs_to_move); |
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868 if (ref_lists[from_idx].length() == 0) { |
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869 break; |
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870 } |
0 | 871 } else { |
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872 to_idx = (to_idx + 1) % _num_q; |
0 | 873 } |
874 } | |
875 } | |
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876 #ifdef ASSERT |
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877 size_t balanced_total_refs = 0; |
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878 for (uint i = 0; i < _max_num_q; ++i) { |
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879 balanced_total_refs += ref_lists[i].length(); |
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880 if (TraceReferenceGC && PrintGCDetails) { |
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881 gclog_or_tty->print("%d ", ref_lists[i].length()); |
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882 } |
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883 } |
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884 if (TraceReferenceGC && PrintGCDetails) { |
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885 gclog_or_tty->print_cr(" = %d", balanced_total_refs); |
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886 gclog_or_tty->flush(); |
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887 } |
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888 assert(total_refs == balanced_total_refs, "Balancing was incomplete"); |
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889 #endif |
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890 } |
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891 |
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892 void ReferenceProcessor::balance_all_queues() { |
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893 balance_queues(_discoveredSoftRefs); |
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894 balance_queues(_discoveredWeakRefs); |
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895 balance_queues(_discoveredFinalRefs); |
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896 balance_queues(_discoveredPhantomRefs); |
20755 | 897 balance_queues(_discoveredCleanerRefs); |
0 | 898 } |
899 | |
10405 | 900 size_t |
0 | 901 ReferenceProcessor::process_discovered_reflist( |
902 DiscoveredList refs_lists[], | |
903 ReferencePolicy* policy, | |
904 bool clear_referent, | |
905 BoolObjectClosure* is_alive, | |
906 OopClosure* keep_alive, | |
907 VoidClosure* complete_gc, | |
908 AbstractRefProcTaskExecutor* task_executor) | |
909 { | |
1833
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910 bool mt_processing = task_executor != NULL && _processing_is_mt; |
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911 // If discovery used MT and a dynamic number of GC threads, then |
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912 // the queues must be balanced for correctness if fewer than the |
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913 // maximum number of queues were used. The number of queue used |
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914 // during discovery may be different than the number to be used |
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915 // for processing so don't depend of _num_q < _max_num_q as part |
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916 // of the test. |
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917 bool must_balance = _discovery_is_mt; |
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918 |
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919 if ((mt_processing && ParallelRefProcBalancingEnabled) || |
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920 must_balance) { |
0 | 921 balance_queues(refs_lists); |
922 } | |
10405 | 923 |
924 size_t total_list_count = total_count(refs_lists); | |
925 | |
0 | 926 if (PrintReferenceGC && PrintGCDetails) { |
10405 | 927 gclog_or_tty->print(", %u refs", total_list_count); |
0 | 928 } |
929 | |
930 // Phase 1 (soft refs only): | |
931 // . Traverse the list and remove any SoftReferences whose | |
932 // referents are not alive, but that should be kept alive for | |
933 // policy reasons. Keep alive the transitive closure of all | |
934 // such referents. | |
935 if (policy != NULL) { | |
1833
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936 if (mt_processing) { |
0 | 937 RefProcPhase1Task phase1(*this, refs_lists, policy, true /*marks_oops_alive*/); |
938 task_executor->execute(phase1); | |
939 } else { | |
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940 for (uint i = 0; i < _max_num_q; i++) { |
0 | 941 process_phase1(refs_lists[i], policy, |
942 is_alive, keep_alive, complete_gc); | |
943 } | |
944 } | |
945 } else { // policy == NULL | |
946 assert(refs_lists != _discoveredSoftRefs, | |
947 "Policy must be specified for soft references."); | |
948 } | |
949 | |
950 // Phase 2: | |
951 // . Traverse the list and remove any refs whose referents are alive. | |
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952 if (mt_processing) { |
0 | 953 RefProcPhase2Task phase2(*this, refs_lists, !discovery_is_atomic() /*marks_oops_alive*/); |
954 task_executor->execute(phase2); | |
955 } else { | |
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956 for (uint i = 0; i < _max_num_q; i++) { |
0 | 957 process_phase2(refs_lists[i], is_alive, keep_alive, complete_gc); |
958 } | |
959 } | |
960 | |
961 // Phase 3: | |
962 // . Traverse the list and process referents as appropriate. | |
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963 if (mt_processing) { |
0 | 964 RefProcPhase3Task phase3(*this, refs_lists, clear_referent, true /*marks_oops_alive*/); |
965 task_executor->execute(phase3); | |
966 } else { | |
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967 for (uint i = 0; i < _max_num_q; i++) { |
0 | 968 process_phase3(refs_lists[i], clear_referent, |
969 is_alive, keep_alive, complete_gc); | |
970 } | |
971 } | |
10405 | 972 |
973 return total_list_count; | |
0 | 974 } |
975 | |
976 void ReferenceProcessor::clean_up_discovered_references() { | |
977 // loop over the lists | |
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978 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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979 if (TraceReferenceGC && PrintGCDetails && ((i % _max_num_q) == 0)) { |
0 | 980 gclog_or_tty->print_cr( |
981 "\nScrubbing %s discovered list of Null referents", | |
982 list_name(i)); | |
983 } | |
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984 clean_up_discovered_reflist(_discovered_refs[i]); |
0 | 985 } |
986 } | |
987 | |
988 void ReferenceProcessor::clean_up_discovered_reflist(DiscoveredList& refs_list) { | |
989 assert(!discovery_is_atomic(), "Else why call this method?"); | |
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990 DiscoveredListIterator iter(refs_list, NULL, NULL); |
0 | 991 while (iter.has_next()) { |
992 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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993 oop next = java_lang_ref_Reference::next(iter.obj()); |
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994 assert(next->is_oop_or_null(), "bad next field"); |
0 | 995 // If referent has been cleared or Reference is not active, |
996 // drop it. | |
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997 if (iter.referent() == NULL || next != NULL) { |
0 | 998 debug_only( |
999 if (PrintGCDetails && TraceReferenceGC) { | |
1000 gclog_or_tty->print_cr("clean_up_discovered_list: Dropping Reference: " | |
1001 INTPTR_FORMAT " with next field: " INTPTR_FORMAT | |
1002 " and referent: " INTPTR_FORMAT, | |
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1003 (void *)iter.obj(), (void *)next, (void *)iter.referent()); |
0 | 1004 } |
1005 ) | |
1006 // Remove Reference object from list | |
1007 iter.remove(); | |
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1008 iter.move_to_next(); |
0 | 1009 } else { |
1010 iter.next(); | |
1011 } | |
1012 } | |
1013 NOT_PRODUCT( | |
1014 if (PrintGCDetails && TraceReferenceGC) { | |
1015 gclog_or_tty->print( | |
1016 " Removed %d Refs with NULL referents out of %d discovered Refs", | |
1017 iter.removed(), iter.processed()); | |
1018 } | |
1019 ) | |
1020 } | |
1021 | |
1022 inline DiscoveredList* ReferenceProcessor::get_discovered_list(ReferenceType rt) { | |
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1023 uint id = 0; |
0 | 1024 // Determine the queue index to use for this object. |
1025 if (_discovery_is_mt) { | |
1026 // During a multi-threaded discovery phase, | |
1027 // each thread saves to its "own" list. | |
1028 Thread* thr = Thread::current(); | |
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1029 id = thr->as_Worker_thread()->id(); |
0 | 1030 } else { |
1031 // single-threaded discovery, we save in round-robin | |
1032 // fashion to each of the lists. | |
1033 if (_processing_is_mt) { | |
1034 id = next_id(); | |
1035 } | |
1036 } | |
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1037 assert(0 <= id && id < _max_num_q, "Id is out-of-bounds (call Freud?)"); |
0 | 1038 |
1039 // Get the discovered queue to which we will add | |
1040 DiscoveredList* list = NULL; | |
1041 switch (rt) { | |
1042 case REF_OTHER: | |
1043 // Unknown reference type, no special treatment | |
1044 break; | |
1045 case REF_SOFT: | |
1046 list = &_discoveredSoftRefs[id]; | |
1047 break; | |
1048 case REF_WEAK: | |
1049 list = &_discoveredWeakRefs[id]; | |
1050 break; | |
1051 case REF_FINAL: | |
1052 list = &_discoveredFinalRefs[id]; | |
1053 break; | |
1054 case REF_PHANTOM: | |
1055 list = &_discoveredPhantomRefs[id]; | |
1056 break; | |
20755 | 1057 case REF_CLEANER: |
1058 list = &_discoveredCleanerRefs[id]; | |
1059 break; | |
0 | 1060 case REF_NONE: |
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1061 // we should not reach here if we are an InstanceRefKlass |
0 | 1062 default: |
1063 ShouldNotReachHere(); | |
1064 } | |
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1065 if (TraceReferenceGC && PrintGCDetails) { |
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1066 gclog_or_tty->print_cr("Thread %d gets list " INTPTR_FORMAT, id, list); |
1833
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1067 } |
0 | 1068 return list; |
1069 } | |
1070 | |
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1071 inline void |
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1072 ReferenceProcessor::add_to_discovered_list_mt(DiscoveredList& refs_list, |
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1073 oop obj, |
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1074 HeapWord* discovered_addr) { |
0 | 1075 assert(_discovery_is_mt, "!_discovery_is_mt should have been handled by caller"); |
1076 // First we must make sure this object is only enqueued once. CAS in a non null | |
1077 // discovered_addr. | |
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1078 oop current_head = refs_list.head(); |
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1079 // The last ref must have its discovered field pointing to itself. |
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1080 oop next_discovered = (current_head != NULL) ? current_head : obj; |
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1081 |
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1082 oop retest = oopDesc::atomic_compare_exchange_oop(next_discovered, discovered_addr, |
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1083 NULL); |
0 | 1084 if (retest == NULL) { |
1085 // This thread just won the right to enqueue the object. | |
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1086 // We have separate lists for enqueueing, so no synchronization |
0 | 1087 // is necessary. |
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1088 refs_list.set_head(obj); |
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1089 refs_list.inc_length(1); |
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1090 |
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1091 if (TraceReferenceGC) { |
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1092 gclog_or_tty->print_cr("Discovered reference (mt) (" INTPTR_FORMAT ": %s)", |
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1093 (void *)obj, obj->klass()->internal_name()); |
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1094 } |
0 | 1095 } else { |
1096 // If retest was non NULL, another thread beat us to it: | |
1097 // The reference has already been discovered... | |
1098 if (TraceReferenceGC) { | |
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1099 gclog_or_tty->print_cr("Already discovered reference (" INTPTR_FORMAT ": %s)", |
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1100 (void *)obj, obj->klass()->internal_name()); |
0 | 1101 } |
1102 } | |
1103 } | |
1104 | |
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1105 #ifndef PRODUCT |
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1106 // Non-atomic (i.e. concurrent) discovery might allow us |
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1107 // to observe j.l.References with NULL referents, being those |
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1108 // cleared concurrently by mutators during (or after) discovery. |
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1109 void ReferenceProcessor::verify_referent(oop obj) { |
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1110 bool da = discovery_is_atomic(); |
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1111 oop referent = java_lang_ref_Reference::referent(obj); |
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1112 assert(da ? referent->is_oop() : referent->is_oop_or_null(), |
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1113 err_msg("Bad referent " INTPTR_FORMAT " found in Reference " |
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1114 INTPTR_FORMAT " during %satomic discovery ", |
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1115 (void *)referent, (void *)obj, da ? "" : "non-")); |
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1116 } |
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1117 #endif |
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1118 |
0 | 1119 // We mention two of several possible choices here: |
1120 // #0: if the reference object is not in the "originating generation" | |
1121 // (or part of the heap being collected, indicated by our "span" | |
1122 // we don't treat it specially (i.e. we scan it as we would | |
1123 // a normal oop, treating its references as strong references). | |
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1124 // This means that references can't be discovered unless their |
0 | 1125 // referent is also in the same span. This is the simplest, |
1126 // most "local" and most conservative approach, albeit one | |
1127 // that may cause weak references to be enqueued least promptly. | |
1128 // We call this choice the "ReferenceBasedDiscovery" policy. | |
1129 // #1: the reference object may be in any generation (span), but if | |
1130 // the referent is in the generation (span) being currently collected | |
1131 // then we can discover the reference object, provided | |
1132 // the object has not already been discovered by | |
1133 // a different concurrently running collector (as may be the | |
1134 // case, for instance, if the reference object is in CMS and | |
1135 // the referent in DefNewGeneration), and provided the processing | |
1136 // of this reference object by the current collector will | |
1137 // appear atomic to every other collector in the system. | |
1138 // (Thus, for instance, a concurrent collector may not | |
1139 // discover references in other generations even if the | |
1140 // referent is in its own generation). This policy may, | |
1141 // in certain cases, enqueue references somewhat sooner than | |
1142 // might Policy #0 above, but at marginally increased cost | |
1143 // and complexity in processing these references. | |
1144 // We call this choice the "RefeferentBasedDiscovery" policy. | |
1145 bool ReferenceProcessor::discover_reference(oop obj, ReferenceType rt) { | |
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1146 // Make sure we are discovering refs (rather than processing discovered refs). |
0 | 1147 if (!_discovering_refs || !RegisterReferences) { |
1148 return false; | |
1149 } | |
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1150 // We only discover active references. |
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1151 oop next = java_lang_ref_Reference::next(obj); |
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1152 if (next != NULL) { // Ref is no longer active |
0 | 1153 return false; |
1154 } | |
1155 | |
1156 HeapWord* obj_addr = (HeapWord*)obj; | |
1157 if (RefDiscoveryPolicy == ReferenceBasedDiscovery && | |
1158 !_span.contains(obj_addr)) { | |
1159 // Reference is not in the originating generation; | |
1160 // don't treat it specially (i.e. we want to scan it as a normal | |
1161 // object with strong references). | |
1162 return false; | |
1163 } | |
1164 | |
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1165 // We only discover references whose referents are not (yet) |
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1166 // known to be strongly reachable. |
0 | 1167 if (is_alive_non_header() != NULL) { |
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1168 verify_referent(obj); |
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1169 if (is_alive_non_header()->do_object_b(java_lang_ref_Reference::referent(obj))) { |
0 | 1170 return false; // referent is reachable |
1171 } | |
1172 } | |
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1173 if (rt == REF_SOFT) { |
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1174 // For soft refs we can decide now if these are not |
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1175 // current candidates for clearing, in which case we |
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1176 // can mark through them now, rather than delaying that |
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1177 // to the reference-processing phase. Since all current |
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1178 // time-stamp policies advance the soft-ref clock only |
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1179 // at a major collection cycle, this is always currently |
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1180 // accurate. |
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1181 if (!_current_soft_ref_policy->should_clear_reference(obj, _soft_ref_timestamp_clock)) { |
453
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1182 return false; |
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1183 } |
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1184 } |
0 | 1185 |
3979
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1186 ResourceMark rm; // Needed for tracing. |
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1187 |
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1188 HeapWord* const discovered_addr = java_lang_ref_Reference::discovered_addr(obj); |
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1189 const oop discovered = java_lang_ref_Reference::discovered(obj); |
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1190 assert(discovered->is_oop_or_null(), "bad discovered field"); |
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1191 if (discovered != NULL) { |
0 | 1192 // The reference has already been discovered... |
1193 if (TraceReferenceGC) { | |
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1194 gclog_or_tty->print_cr("Already discovered reference (" INTPTR_FORMAT ": %s)", |
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1195 (void *)obj, obj->klass()->internal_name()); |
0 | 1196 } |
1197 if (RefDiscoveryPolicy == ReferentBasedDiscovery) { | |
1198 // assumes that an object is not processed twice; | |
1199 // if it's been already discovered it must be on another | |
1200 // generation's discovered list; so we won't discover it. | |
1201 return false; | |
1202 } else { | |
1203 assert(RefDiscoveryPolicy == ReferenceBasedDiscovery, | |
1204 "Unrecognized policy"); | |
1205 // Check assumption that an object is not potentially | |
1206 // discovered twice except by concurrent collectors that potentially | |
1207 // trace the same Reference object twice. | |
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1208 assert(UseConcMarkSweepGC || UseG1GC, |
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1209 "Only possible with a concurrent marking collector"); |
0 | 1210 return true; |
1211 } | |
1212 } | |
1213 | |
1214 if (RefDiscoveryPolicy == ReferentBasedDiscovery) { | |
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1215 verify_referent(obj); |
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1216 // Discover if and only if EITHER: |
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1217 // .. reference is in our span, OR |
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1218 // .. we are an atomic collector and referent is in our span |
0 | 1219 if (_span.contains(obj_addr) || |
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1220 (discovery_is_atomic() && |
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1221 _span.contains(java_lang_ref_Reference::referent(obj)))) { |
0 | 1222 // should_enqueue = true; |
1223 } else { | |
1224 return false; | |
1225 } | |
1226 } else { | |
1227 assert(RefDiscoveryPolicy == ReferenceBasedDiscovery && | |
1228 _span.contains(obj_addr), "code inconsistency"); | |
1229 } | |
1230 | |
1231 // Get the right type of discovered queue head. | |
1232 DiscoveredList* list = get_discovered_list(rt); | |
1233 if (list == NULL) { | |
1234 return false; // nothing special needs to be done | |
1235 } | |
1236 | |
1237 if (_discovery_is_mt) { | |
1238 add_to_discovered_list_mt(*list, obj, discovered_addr); | |
1239 } else { | |
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1240 // We do a raw store here: the field will be visited later when processing |
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1241 // the discovered references. |
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1242 oop current_head = list->head(); |
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1243 // The last ref must have its discovered field pointing to itself. |
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1244 oop next_discovered = (current_head != NULL) ? current_head : obj; |
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1245 |
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1246 assert(discovered == NULL, "control point invariant"); |
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1247 oop_store_raw(discovered_addr, next_discovered); |
0 | 1248 list->set_head(obj); |
452
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1249 list->inc_length(1); |
0 | 1250 |
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|
1251 if (TraceReferenceGC) { |
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|
1252 gclog_or_tty->print_cr("Discovered reference (" INTPTR_FORMAT ": %s)", |
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1253 (void *)obj, obj->klass()->internal_name()); |
0 | 1254 } |
1255 } | |
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1256 assert(obj->is_oop(), "Discovered a bad reference"); |
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1257 verify_referent(obj); |
0 | 1258 return true; |
1259 } | |
1260 | |
1261 // Preclean the discovered references by removing those | |
1262 // whose referents are alive, and by marking from those that | |
1263 // are not active. These lists can be handled here | |
1264 // in any order and, indeed, concurrently. | |
1265 void ReferenceProcessor::preclean_discovered_references( | |
1266 BoolObjectClosure* is_alive, | |
1267 OopClosure* keep_alive, | |
1268 VoidClosure* complete_gc, | |
10405 | 1269 YieldClosure* yield, |
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1270 GCTimer* gc_timer, |
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|
1271 GCId gc_id) { |
0 | 1272 |
1273 NOT_PRODUCT(verify_ok_to_handle_reflists()); | |
1274 | |
1275 // Soft references | |
1276 { | |
10405 | 1277 GCTraceTime tt("Preclean SoftReferences", PrintGCDetails && PrintReferenceGC, |
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|
1278 false, gc_timer, gc_id); |
4728
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|
1279 for (uint i = 0; i < _max_num_q; i++) { |
452
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1280 if (yield->should_return()) { |
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1281 return; |
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1282 } |
0 | 1283 preclean_discovered_reflist(_discoveredSoftRefs[i], is_alive, |
1284 keep_alive, complete_gc, yield); | |
1285 } | |
1286 } | |
1287 | |
1288 // Weak references | |
1289 { | |
10405 | 1290 GCTraceTime tt("Preclean WeakReferences", PrintGCDetails && PrintReferenceGC, |
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1291 false, gc_timer, gc_id); |
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1292 for (uint i = 0; i < _max_num_q; i++) { |
452
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1293 if (yield->should_return()) { |
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1294 return; |
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1295 } |
0 | 1296 preclean_discovered_reflist(_discoveredWeakRefs[i], is_alive, |
1297 keep_alive, complete_gc, yield); | |
1298 } | |
1299 } | |
1300 | |
1301 // Final references | |
1302 { | |
10405 | 1303 GCTraceTime tt("Preclean FinalReferences", PrintGCDetails && PrintReferenceGC, |
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1304 false, gc_timer, gc_id); |
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1305 for (uint i = 0; i < _max_num_q; i++) { |
452
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1306 if (yield->should_return()) { |
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1307 return; |
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1308 } |
0 | 1309 preclean_discovered_reflist(_discoveredFinalRefs[i], is_alive, |
1310 keep_alive, complete_gc, yield); | |
1311 } | |
1312 } | |
1313 | |
1314 // Phantom references | |
1315 { | |
10405 | 1316 GCTraceTime tt("Preclean PhantomReferences", PrintGCDetails && PrintReferenceGC, |
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1317 false, gc_timer, gc_id); |
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1318 for (uint i = 0; i < _max_num_q; i++) { |
452
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1319 if (yield->should_return()) { |
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1320 return; |
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1321 } |
0 | 1322 preclean_discovered_reflist(_discoveredPhantomRefs[i], is_alive, |
1323 keep_alive, complete_gc, yield); | |
1324 } | |
20755 | 1325 |
1326 // Cleaner references. Included in timing for phantom references. We | |
1327 // expect Cleaner references to be temporary, and don't want to deal with | |
1328 // possible incompatibilities arising from making it more visible. | |
1329 for (uint i = 0; i < _max_num_q; i++) { | |
1330 if (yield->should_return()) { | |
1331 return; | |
1332 } | |
1333 preclean_discovered_reflist(_discoveredCleanerRefs[i], is_alive, | |
1334 keep_alive, complete_gc, yield); | |
1335 } | |
0 | 1336 } |
1337 } | |
1338 | |
1339 // Walk the given discovered ref list, and remove all reference objects | |
1340 // whose referents are still alive, whose referents are NULL or which | |
452
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1341 // are not active (have a non-NULL next field). NOTE: When we are |
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1342 // thus precleaning the ref lists (which happens single-threaded today), |
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1343 // we do not disable refs discovery to honour the correct semantics of |
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1344 // java.lang.Reference. As a result, we need to be careful below |
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1345 // that ref removal steps interleave safely with ref discovery steps |
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1346 // (in this thread). |
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1347 void |
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1348 ReferenceProcessor::preclean_discovered_reflist(DiscoveredList& refs_list, |
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1349 BoolObjectClosure* is_alive, |
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1350 OopClosure* keep_alive, |
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1351 VoidClosure* complete_gc, |
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1352 YieldClosure* yield) { |
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1353 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 1354 while (iter.has_next()) { |
1355 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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1356 oop obj = iter.obj(); |
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1357 oop next = java_lang_ref_Reference::next(obj); |
0 | 1358 if (iter.referent() == NULL || iter.is_referent_alive() || |
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1359 next != NULL) { |
0 | 1360 // The referent has been cleared, or is alive, or the Reference is not |
1361 // active; we need to trace and mark its cohort. | |
1362 if (TraceReferenceGC) { | |
1363 gclog_or_tty->print_cr("Precleaning Reference (" INTPTR_FORMAT ": %s)", | |
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1364 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 1365 } |
1366 // Remove Reference object from list | |
1367 iter.remove(); | |
1368 // Keep alive its cohort. | |
1369 iter.make_referent_alive(); | |
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1370 if (UseCompressedOops) { |
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1371 narrowOop* next_addr = (narrowOop*)java_lang_ref_Reference::next_addr(obj); |
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1372 keep_alive->do_oop(next_addr); |
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1373 } else { |
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1374 oop* next_addr = (oop*)java_lang_ref_Reference::next_addr(obj); |
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1375 keep_alive->do_oop(next_addr); |
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1376 } |
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1377 iter.move_to_next(); |
0 | 1378 } else { |
1379 iter.next(); | |
1380 } | |
1381 } | |
1382 // Close the reachable set | |
1383 complete_gc->do_void(); | |
1384 | |
1385 NOT_PRODUCT( | |
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1386 if (PrintGCDetails && PrintReferenceGC && (iter.processed() > 0)) { |
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1387 gclog_or_tty->print_cr(" Dropped %d Refs out of %d " |
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1388 "Refs in discovered list " INTPTR_FORMAT, |
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1389 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 1390 } |
1391 ) | |
1392 } | |
1393 | |
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1394 const char* ReferenceProcessor::list_name(uint i) { |
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1395 assert(i >= 0 && i <= _max_num_q * number_of_subclasses_of_ref(), |
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1396 "Out of bounds index"); |
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1397 |
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1398 int j = i / _max_num_q; |
0 | 1399 switch (j) { |
1400 case 0: return "SoftRef"; | |
1401 case 1: return "WeakRef"; | |
1402 case 2: return "FinalRef"; | |
1403 case 3: return "PhantomRef"; | |
20755 | 1404 case 4: return "CleanerRef"; |
0 | 1405 } |
1406 ShouldNotReachHere(); | |
1407 return NULL; | |
1408 } | |
1409 | |
1410 #ifndef PRODUCT | |
1411 void ReferenceProcessor::verify_ok_to_handle_reflists() { | |
1412 // empty for now | |
1413 } | |
1414 #endif | |
1415 | |
1416 #ifndef PRODUCT | |
1417 void ReferenceProcessor::clear_discovered_references() { | |
1418 guarantee(!_discovering_refs, "Discovering refs?"); | |
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1419 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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1420 clear_discovered_references(_discovered_refs[i]); |
0 | 1421 } |
1422 } | |
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1423 |
0 | 1424 #endif // PRODUCT |