Mercurial > hg > graal-compiler
annotate src/share/vm/memory/referenceProcessor.cpp @ 20619:b12a2a9b05ca
8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
Reviewed-by: mgerdin, coleenp, bdelsart
author | stefank |
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date | Thu, 02 Oct 2014 10:55:36 +0200 |
parents | 0982ec23da03 |
children | c2844108a708 |
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 _default_soft_ref_policy = new COMPILER2_PRESENT(LRUMaxHeapPolicy()) |
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61 NOT_COMPILER2(LRUCurrentHeapPolicy()); |
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62 if (_always_clear_soft_ref_policy == NULL || _default_soft_ref_policy == NULL) { |
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63 vm_exit_during_initialization("Could not allocate reference policy object"); |
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64 } |
0 | 65 guarantee(RefDiscoveryPolicy == ReferenceBasedDiscovery || |
66 RefDiscoveryPolicy == ReferentBasedDiscovery, | |
67 "Unrecongnized RefDiscoveryPolicy"); | |
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68 _pending_list_uses_discovered_field = JDK_Version::current().pending_list_uses_discovered_field(); |
0 | 69 } |
70 | |
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71 void ReferenceProcessor::enable_discovery(bool verify_disabled, bool check_no_refs) { |
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72 #ifdef ASSERT |
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73 // Verify that we're not currently discovering refs |
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74 assert(!verify_disabled || !_discovering_refs, "nested call?"); |
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75 |
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76 if (check_no_refs) { |
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77 // Verify that the discovered lists are empty |
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78 verify_no_references_recorded(); |
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79 } |
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80 #endif // ASSERT |
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81 |
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82 // Someone could have modified the value of the static |
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83 // field in the j.l.r.SoftReference class that holds the |
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84 // soft reference timestamp clock using reflection or |
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85 // Unsafe between GCs. Unconditionally update the static |
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86 // field in ReferenceProcessor here so that we use the new |
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87 // value during reference discovery. |
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88 |
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89 _soft_ref_timestamp_clock = java_lang_ref_SoftReference::clock(); |
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90 _discovering_refs = true; |
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91 } |
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92 |
0 | 93 ReferenceProcessor::ReferenceProcessor(MemRegion span, |
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94 bool mt_processing, |
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95 uint mt_processing_degree, |
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96 bool mt_discovery, |
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97 uint mt_discovery_degree, |
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98 bool atomic_discovery, |
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99 BoolObjectClosure* is_alive_non_header) : |
0 | 100 _discovering_refs(false), |
101 _enqueuing_is_done(false), | |
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102 _is_alive_non_header(is_alive_non_header), |
0 | 103 _processing_is_mt(mt_processing), |
104 _next_id(0) | |
105 { | |
106 _span = span; | |
107 _discovery_is_atomic = atomic_discovery; | |
108 _discovery_is_mt = mt_discovery; | |
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109 _num_q = MAX2(1U, mt_processing_degree); |
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110 _max_num_q = MAX2(_num_q, mt_discovery_degree); |
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111 _discovered_refs = NEW_C_HEAP_ARRAY(DiscoveredList, |
6197 | 112 _max_num_q * number_of_subclasses_of_ref(), mtGC); |
113 | |
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114 if (_discovered_refs == NULL) { |
0 | 115 vm_exit_during_initialization("Could not allocated RefProc Array"); |
116 } | |
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117 _discoveredSoftRefs = &_discovered_refs[0]; |
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118 _discoveredWeakRefs = &_discoveredSoftRefs[_max_num_q]; |
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119 _discoveredFinalRefs = &_discoveredWeakRefs[_max_num_q]; |
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120 _discoveredPhantomRefs = &_discoveredFinalRefs[_max_num_q]; |
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121 |
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122 // Initialize all entries to NULL |
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123 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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124 _discovered_refs[i].set_head(NULL); |
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125 _discovered_refs[i].set_length(0); |
0 | 126 } |
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127 |
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128 setup_policy(false /* default soft ref policy */); |
0 | 129 } |
130 | |
131 #ifndef PRODUCT | |
132 void ReferenceProcessor::verify_no_references_recorded() { | |
133 guarantee(!_discovering_refs, "Discovering refs?"); | |
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134 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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135 guarantee(_discovered_refs[i].is_empty(), |
0 | 136 "Found non-empty discovered list"); |
137 } | |
138 } | |
139 #endif | |
140 | |
141 void ReferenceProcessor::weak_oops_do(OopClosure* f) { | |
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142 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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143 if (UseCompressedOops) { |
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144 f->do_oop((narrowOop*)_discovered_refs[i].adr_head()); |
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145 } else { |
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146 f->do_oop((oop*)_discovered_refs[i].adr_head()); |
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147 } |
0 | 148 } |
149 } | |
150 | |
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151 void ReferenceProcessor::update_soft_ref_master_clock() { |
0 | 152 // Update (advance) the soft ref master clock field. This must be done |
153 // after processing the soft ref list. | |
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154 |
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155 // We need a monotonically non-deccreasing time in ms but |
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156 // os::javaTimeMillis() does not guarantee monotonicity. |
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157 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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158 jlong soft_ref_clock = java_lang_ref_SoftReference::clock(); |
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159 assert(soft_ref_clock == _soft_ref_timestamp_clock, "soft ref clocks out of sync"); |
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160 |
0 | 161 NOT_PRODUCT( |
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162 if (now < _soft_ref_timestamp_clock) { |
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163 warning("time warp: "INT64_FORMAT" to "INT64_FORMAT, |
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164 _soft_ref_timestamp_clock, now); |
0 | 165 } |
166 ) | |
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167 // The values of now and _soft_ref_timestamp_clock are set using |
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168 // javaTimeNanos(), which is guaranteed to be monotonically |
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169 // non-decreasing provided the underlying platform provides such |
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170 // a time source (and it is bug free). |
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171 // In product mode, however, protect ourselves from non-monotonicty. |
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172 if (now > _soft_ref_timestamp_clock) { |
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173 _soft_ref_timestamp_clock = now; |
0 | 174 java_lang_ref_SoftReference::set_clock(now); |
175 } | |
176 // Else leave clock stalled at its old value until time progresses | |
177 // past clock value. | |
178 } | |
179 | |
10405 | 180 size_t ReferenceProcessor::total_count(DiscoveredList lists[]) { |
181 size_t total = 0; | |
182 for (uint i = 0; i < _max_num_q; ++i) { | |
183 total += lists[i].length(); | |
184 } | |
185 return total; | |
186 } | |
187 | |
188 ReferenceProcessorStats ReferenceProcessor::process_discovered_references( | |
0 | 189 BoolObjectClosure* is_alive, |
190 OopClosure* keep_alive, | |
191 VoidClosure* complete_gc, | |
10405 | 192 AbstractRefProcTaskExecutor* task_executor, |
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193 GCTimer* gc_timer, |
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194 GCId gc_id) { |
0 | 195 NOT_PRODUCT(verify_ok_to_handle_reflists()); |
196 | |
197 assert(!enqueuing_is_done(), "If here enqueuing should not be complete"); | |
198 // Stop treating discovered references specially. | |
199 disable_discovery(); | |
200 | |
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201 // If discovery was concurrent, someone could have modified |
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202 // the value of the static field in the j.l.r.SoftReference |
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203 // class that holds the soft reference timestamp clock using |
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204 // reflection or Unsafe between when discovery was enabled and |
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205 // now. Unconditionally update the static field in ReferenceProcessor |
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206 // here so that we use the new value during processing of the |
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207 // discovered soft refs. |
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208 |
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209 _soft_ref_timestamp_clock = java_lang_ref_SoftReference::clock(); |
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210 |
0 | 211 bool trace_time = PrintGCDetails && PrintReferenceGC; |
10405 | 212 |
0 | 213 // Soft references |
10405 | 214 size_t soft_count = 0; |
0 | 215 { |
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216 GCTraceTime tt("SoftReference", trace_time, false, gc_timer, gc_id); |
10405 | 217 soft_count = |
218 process_discovered_reflist(_discoveredSoftRefs, _current_soft_ref_policy, true, | |
219 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 220 } |
221 | |
222 update_soft_ref_master_clock(); | |
223 | |
224 // Weak references | |
10405 | 225 size_t weak_count = 0; |
0 | 226 { |
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227 GCTraceTime tt("WeakReference", trace_time, false, gc_timer, gc_id); |
10405 | 228 weak_count = |
229 process_discovered_reflist(_discoveredWeakRefs, NULL, true, | |
230 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 231 } |
232 | |
233 // Final references | |
10405 | 234 size_t final_count = 0; |
0 | 235 { |
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236 GCTraceTime tt("FinalReference", trace_time, false, gc_timer, gc_id); |
10405 | 237 final_count = |
238 process_discovered_reflist(_discoveredFinalRefs, NULL, false, | |
239 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 240 } |
241 | |
242 // Phantom references | |
10405 | 243 size_t phantom_count = 0; |
0 | 244 { |
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245 GCTraceTime tt("PhantomReference", trace_time, false, gc_timer, gc_id); |
10405 | 246 phantom_count = |
247 process_discovered_reflist(_discoveredPhantomRefs, NULL, false, | |
248 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 249 } |
250 | |
251 // Weak global JNI references. It would make more sense (semantically) to | |
252 // traverse these simultaneously with the regular weak references above, but | |
253 // that is not how the JDK1.2 specification is. See #4126360. Native code can | |
254 // thus use JNI weak references to circumvent the phantom references and | |
255 // resurrect a "post-mortem" object. | |
256 { | |
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257 GCTraceTime tt("JNI Weak Reference", trace_time, false, gc_timer, gc_id); |
0 | 258 if (task_executor != NULL) { |
259 task_executor->set_single_threaded_mode(); | |
260 } | |
261 process_phaseJNI(is_alive, keep_alive, complete_gc); | |
262 } | |
10405 | 263 |
264 return ReferenceProcessorStats(soft_count, weak_count, final_count, phantom_count); | |
0 | 265 } |
266 | |
267 #ifndef PRODUCT | |
268 // Calculate the number of jni handles. | |
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269 uint ReferenceProcessor::count_jni_refs() { |
0 | 270 class AlwaysAliveClosure: public BoolObjectClosure { |
271 public: | |
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272 virtual bool do_object_b(oop obj) { return true; } |
0 | 273 }; |
274 | |
275 class CountHandleClosure: public OopClosure { | |
276 private: | |
277 int _count; | |
278 public: | |
279 CountHandleClosure(): _count(0) {} | |
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280 void do_oop(oop* unused) { _count++; } |
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281 void do_oop(narrowOop* unused) { ShouldNotReachHere(); } |
0 | 282 int count() { return _count; } |
283 }; | |
284 CountHandleClosure global_handle_count; | |
285 AlwaysAliveClosure always_alive; | |
286 JNIHandles::weak_oops_do(&always_alive, &global_handle_count); | |
287 return global_handle_count.count(); | |
288 } | |
289 #endif | |
290 | |
291 void ReferenceProcessor::process_phaseJNI(BoolObjectClosure* is_alive, | |
292 OopClosure* keep_alive, | |
293 VoidClosure* complete_gc) { | |
294 #ifndef PRODUCT | |
295 if (PrintGCDetails && PrintReferenceGC) { | |
296 unsigned int count = count_jni_refs(); | |
297 gclog_or_tty->print(", %u refs", count); | |
298 } | |
299 #endif | |
300 JNIHandles::weak_oops_do(is_alive, keep_alive); | |
301 complete_gc->do_void(); | |
302 } | |
303 | |
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304 |
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305 template <class T> |
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306 bool enqueue_discovered_ref_helper(ReferenceProcessor* ref, |
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307 AbstractRefProcTaskExecutor* task_executor) { |
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308 |
0 | 309 // Remember old value of pending references list |
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310 T* pending_list_addr = (T*)java_lang_ref_Reference::pending_list_addr(); |
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311 T old_pending_list_value = *pending_list_addr; |
0 | 312 |
313 // Enqueue references that are not made active again, and | |
314 // clear the decks for the next collection (cycle). | |
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315 ref->enqueue_discovered_reflists((HeapWord*)pending_list_addr, task_executor); |
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316 // Do the post-barrier on pending_list_addr missed in |
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317 // enqueue_discovered_reflist. |
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318 oopDesc::bs()->write_ref_field(pending_list_addr, oopDesc::load_decode_heap_oop(pending_list_addr)); |
0 | 319 |
320 // Stop treating discovered references specially. | |
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321 ref->disable_discovery(); |
0 | 322 |
323 // Return true if new pending references were added | |
324 return old_pending_list_value != *pending_list_addr; | |
325 } | |
326 | |
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327 bool ReferenceProcessor::enqueue_discovered_references(AbstractRefProcTaskExecutor* task_executor) { |
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328 NOT_PRODUCT(verify_ok_to_handle_reflists()); |
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329 if (UseCompressedOops) { |
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330 return enqueue_discovered_ref_helper<narrowOop>(this, task_executor); |
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331 } else { |
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332 return enqueue_discovered_ref_helper<oop>(this, task_executor); |
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333 } |
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334 } |
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335 |
0 | 336 void ReferenceProcessor::enqueue_discovered_reflist(DiscoveredList& refs_list, |
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337 HeapWord* pending_list_addr) { |
0 | 338 // Given a list of refs linked through the "discovered" field |
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339 // (java.lang.ref.Reference.discovered), self-loop their "next" field |
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340 // thus distinguishing them from active References, then |
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341 // prepend them to the pending list. |
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342 // |
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343 // The Java threads will see the Reference objects linked together through |
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344 // the discovered field. Instead of trying to do the write barrier updates |
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345 // in all places in the reference processor where we manipulate the discovered |
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346 // field we make sure to do the barrier here where we anyway iterate through |
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347 // all linked Reference objects. Note that it is important to not dirty any |
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348 // cards during reference processing since this will cause card table |
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349 // verification to fail for G1. |
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350 // |
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351 // BKWRD COMPATIBILITY NOTE: For older JDKs (prior to the fix for 4956777), |
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352 // the "next" field is used to chain the pending list, not the discovered |
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353 // field. |
0 | 354 if (TraceReferenceGC && PrintGCDetails) { |
355 gclog_or_tty->print_cr("ReferenceProcessor::enqueue_discovered_reflist list " | |
356 INTPTR_FORMAT, (address)refs_list.head()); | |
357 } | |
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358 |
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359 oop obj = NULL; |
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360 oop next_d = refs_list.head(); |
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361 if (pending_list_uses_discovered_field()) { // New behavior |
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362 // Walk down the list, self-looping the next field |
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363 // so that the References are not considered active. |
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364 while (obj != next_d) { |
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365 obj = next_d; |
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366 assert(obj->is_instanceRef(), "should be reference object"); |
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367 next_d = java_lang_ref_Reference::discovered(obj); |
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368 if (TraceReferenceGC && PrintGCDetails) { |
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369 gclog_or_tty->print_cr(" obj " INTPTR_FORMAT "/next_d " INTPTR_FORMAT, |
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370 (void *)obj, (void *)next_d); |
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371 } |
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372 assert(java_lang_ref_Reference::next(obj) == NULL, |
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373 "Reference not active; should not be discovered"); |
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374 // Self-loop next, so as to make Ref not active. |
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375 java_lang_ref_Reference::set_next_raw(obj, obj); |
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376 if (next_d != obj) { |
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377 oopDesc::bs()->write_ref_field(java_lang_ref_Reference::discovered_addr(obj), next_d); |
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378 } else { |
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379 // This is the last object. |
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380 // Swap refs_list into pending_list_addr and |
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381 // set obj's discovered to what we read from pending_list_addr. |
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382 oop old = oopDesc::atomic_exchange_oop(refs_list.head(), pending_list_addr); |
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383 // Need post-barrier on pending_list_addr. See enqueue_discovered_ref_helper() above. |
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384 java_lang_ref_Reference::set_discovered_raw(obj, old); // old may be NULL |
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385 oopDesc::bs()->write_ref_field(java_lang_ref_Reference::discovered_addr(obj), old); |
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386 } |
0 | 387 } |
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388 } else { // Old behaviour |
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389 // Walk down the list, copying the discovered field into |
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390 // the next field and clearing the discovered field. |
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391 while (obj != next_d) { |
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392 obj = next_d; |
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393 assert(obj->is_instanceRef(), "should be reference object"); |
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394 next_d = java_lang_ref_Reference::discovered(obj); |
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395 if (TraceReferenceGC && PrintGCDetails) { |
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396 gclog_or_tty->print_cr(" obj " INTPTR_FORMAT "/next_d " INTPTR_FORMAT, |
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397 (void *)obj, (void *)next_d); |
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398 } |
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399 assert(java_lang_ref_Reference::next(obj) == NULL, |
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400 "The reference should not be enqueued"); |
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401 if (next_d == obj) { // obj is last |
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402 // Swap refs_list into pendling_list_addr and |
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403 // set obj's next to what we read from pending_list_addr. |
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404 oop old = oopDesc::atomic_exchange_oop(refs_list.head(), pending_list_addr); |
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405 // Need oop_check on pending_list_addr above; |
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406 // see special oop-check code at the end of |
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407 // enqueue_discovered_reflists() further below. |
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408 if (old == NULL) { |
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409 // obj should be made to point to itself, since |
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410 // pending list was empty. |
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411 java_lang_ref_Reference::set_next(obj, obj); |
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412 } else { |
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413 java_lang_ref_Reference::set_next(obj, old); |
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414 } |
0 | 415 } else { |
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416 java_lang_ref_Reference::set_next(obj, next_d); |
0 | 417 } |
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418 java_lang_ref_Reference::set_discovered(obj, (oop) NULL); |
0 | 419 } |
420 } | |
421 } | |
422 | |
423 // Parallel enqueue task | |
424 class RefProcEnqueueTask: public AbstractRefProcTaskExecutor::EnqueueTask { | |
425 public: | |
426 RefProcEnqueueTask(ReferenceProcessor& ref_processor, | |
427 DiscoveredList discovered_refs[], | |
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428 HeapWord* pending_list_addr, |
0 | 429 int n_queues) |
430 : EnqueueTask(ref_processor, discovered_refs, | |
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431 pending_list_addr, n_queues) |
0 | 432 { } |
433 | |
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434 virtual void work(unsigned int work_id) { |
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435 assert(work_id < (unsigned int)_ref_processor.max_num_q(), "Index out-of-bounds"); |
0 | 436 // Simplest first cut: static partitioning. |
437 int index = work_id; | |
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438 // The increment on "index" must correspond to the maximum number of queues |
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439 // (n_queues) with which that ReferenceProcessor was created. That |
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440 // is because of the "clever" way the discovered references lists were |
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441 // allocated and are indexed into. |
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442 assert(_n_queues == (int) _ref_processor.max_num_q(), "Different number not expected"); |
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443 for (int j = 0; |
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444 j < ReferenceProcessor::number_of_subclasses_of_ref(); |
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445 j++, index += _n_queues) { |
0 | 446 _ref_processor.enqueue_discovered_reflist( |
447 _refs_lists[index], _pending_list_addr); | |
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448 _refs_lists[index].set_head(NULL); |
0 | 449 _refs_lists[index].set_length(0); |
450 } | |
451 } | |
452 }; | |
453 | |
454 // Enqueue references that are not made active again | |
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455 void ReferenceProcessor::enqueue_discovered_reflists(HeapWord* pending_list_addr, |
0 | 456 AbstractRefProcTaskExecutor* task_executor) { |
457 if (_processing_is_mt && task_executor != NULL) { | |
458 // Parallel code | |
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459 RefProcEnqueueTask tsk(*this, _discovered_refs, |
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460 pending_list_addr, _max_num_q); |
0 | 461 task_executor->execute(tsk); |
462 } else { | |
463 // Serial code: call the parent class's implementation | |
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464 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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465 enqueue_discovered_reflist(_discovered_refs[i], pending_list_addr); |
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466 _discovered_refs[i].set_head(NULL); |
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467 _discovered_refs[i].set_length(0); |
0 | 468 } |
469 } | |
470 } | |
471 | |
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472 void DiscoveredListIterator::load_ptrs(DEBUG_ONLY(bool allow_null_referent)) { |
0 | 473 _discovered_addr = java_lang_ref_Reference::discovered_addr(_ref); |
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474 oop discovered = java_lang_ref_Reference::discovered(_ref); |
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475 assert(_discovered_addr && discovered->is_oop_or_null(), |
0 | 476 "discovered field is bad"); |
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477 _next = discovered; |
0 | 478 _referent_addr = java_lang_ref_Reference::referent_addr(_ref); |
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479 _referent = java_lang_ref_Reference::referent(_ref); |
0 | 480 assert(Universe::heap()->is_in_reserved_or_null(_referent), |
481 "Wrong oop found in java.lang.Reference object"); | |
482 assert(allow_null_referent ? | |
483 _referent->is_oop_or_null() | |
484 : _referent->is_oop(), | |
485 "bad referent"); | |
486 } | |
487 | |
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488 void DiscoveredListIterator::remove() { |
0 | 489 assert(_ref->is_oop(), "Dropping a bad reference"); |
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490 oop_store_raw(_discovered_addr, NULL); |
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491 |
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492 // First _prev_next ref actually points into DiscoveredList (gross). |
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493 oop new_next; |
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494 if (_next == _ref) { |
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495 // At the end of the list, we should make _prev point to itself. |
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496 // If _ref is the first ref, then _prev_next will be in the DiscoveredList, |
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497 // and _prev will be NULL. |
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498 new_next = _prev; |
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499 } else { |
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500 new_next = _next; |
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501 } |
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502 // Remove Reference object from discovered list. Note that G1 does not need a |
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503 // pre-barrier here because we know the Reference has already been found/marked, |
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504 // that's how it ended up in the discovered list in the first place. |
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505 oop_store_raw(_prev_next, new_next); |
0 | 506 NOT_PRODUCT(_removed++); |
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507 _refs_list.dec_length(1); |
0 | 508 } |
509 | |
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510 // Make the Reference object active again. |
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511 void DiscoveredListIterator::make_active() { |
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512 // The pre barrier for G1 is probably just needed for the old |
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513 // reference processing behavior. Should we guard this with |
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514 // ReferenceProcessor::pending_list_uses_discovered_field() ? |
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515 if (UseG1GC) { |
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516 HeapWord* next_addr = java_lang_ref_Reference::next_addr(_ref); |
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517 if (UseCompressedOops) { |
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518 oopDesc::bs()->write_ref_field_pre((narrowOop*)next_addr, NULL); |
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519 } else { |
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520 oopDesc::bs()->write_ref_field_pre((oop*)next_addr, NULL); |
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521 } |
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522 } |
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523 java_lang_ref_Reference::set_next_raw(_ref, NULL); |
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524 } |
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525 |
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526 void DiscoveredListIterator::clear_referent() { |
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527 oop_store_raw(_referent_addr, NULL); |
0 | 528 } |
529 | |
530 // NOTE: process_phase*() are largely similar, and at a high level | |
531 // merely iterate over the extant list applying a predicate to | |
532 // each of its elements and possibly removing that element from the | |
533 // list and applying some further closures to that element. | |
534 // We should consider the possibility of replacing these | |
535 // process_phase*() methods by abstracting them into | |
536 // a single general iterator invocation that receives appropriate | |
537 // closures that accomplish this work. | |
538 | |
539 // (SoftReferences only) Traverse the list and remove any SoftReferences whose | |
540 // referents are not alive, but that should be kept alive for policy reasons. | |
541 // Keep alive the transitive closure of all such referents. | |
542 void | |
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543 ReferenceProcessor::process_phase1(DiscoveredList& refs_list, |
0 | 544 ReferencePolicy* policy, |
545 BoolObjectClosure* is_alive, | |
546 OopClosure* keep_alive, | |
547 VoidClosure* complete_gc) { | |
548 assert(policy != NULL, "Must have a non-NULL policy"); | |
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549 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 550 // Decide which softly reachable refs should be kept alive. |
551 while (iter.has_next()) { | |
552 iter.load_ptrs(DEBUG_ONLY(!discovery_is_atomic() /* allow_null_referent */)); | |
553 bool referent_is_dead = (iter.referent() != NULL) && !iter.is_referent_alive(); | |
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554 if (referent_is_dead && |
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555 !policy->should_clear_reference(iter.obj(), _soft_ref_timestamp_clock)) { |
0 | 556 if (TraceReferenceGC) { |
557 gclog_or_tty->print_cr("Dropping reference (" INTPTR_FORMAT ": %s" ") by policy", | |
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558 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 559 } |
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560 // Remove Reference object from list |
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561 iter.remove(); |
0 | 562 // Make the Reference object active again |
563 iter.make_active(); | |
564 // keep the referent around | |
565 iter.make_referent_alive(); | |
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566 iter.move_to_next(); |
0 | 567 } else { |
568 iter.next(); | |
569 } | |
570 } | |
571 // Close the reachable set | |
572 complete_gc->do_void(); | |
573 NOT_PRODUCT( | |
574 if (PrintGCDetails && TraceReferenceGC) { | |
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575 gclog_or_tty->print_cr(" Dropped %d dead Refs out of %d " |
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576 "discovered Refs by policy, from list " INTPTR_FORMAT, |
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577 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 578 } |
579 ) | |
580 } | |
581 | |
582 // Traverse the list and remove any Refs that are not active, or | |
583 // whose referents are either alive or NULL. | |
584 void | |
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585 ReferenceProcessor::pp2_work(DiscoveredList& refs_list, |
0 | 586 BoolObjectClosure* is_alive, |
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587 OopClosure* keep_alive) { |
0 | 588 assert(discovery_is_atomic(), "Error"); |
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589 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 590 while (iter.has_next()) { |
591 iter.load_ptrs(DEBUG_ONLY(false /* allow_null_referent */)); | |
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592 DEBUG_ONLY(oop next = java_lang_ref_Reference::next(iter.obj());) |
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593 assert(next == NULL, "Should not discover inactive Reference"); |
0 | 594 if (iter.is_referent_alive()) { |
595 if (TraceReferenceGC) { | |
596 gclog_or_tty->print_cr("Dropping strongly reachable reference (" INTPTR_FORMAT ": %s)", | |
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597 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 598 } |
599 // The referent is reachable after all. | |
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600 // Remove Reference object from list. |
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601 iter.remove(); |
0 | 602 // Update the referent pointer as necessary: Note that this |
603 // should not entail any recursive marking because the | |
604 // referent must already have been traversed. | |
605 iter.make_referent_alive(); | |
452
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606 iter.move_to_next(); |
0 | 607 } else { |
608 iter.next(); | |
609 } | |
610 } | |
611 NOT_PRODUCT( | |
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612 if (PrintGCDetails && TraceReferenceGC && (iter.processed() > 0)) { |
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613 gclog_or_tty->print_cr(" Dropped %d active Refs out of %d " |
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614 "Refs in discovered list " INTPTR_FORMAT, |
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615 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 616 } |
617 ) | |
618 } | |
619 | |
620 void | |
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621 ReferenceProcessor::pp2_work_concurrent_discovery(DiscoveredList& refs_list, |
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622 BoolObjectClosure* is_alive, |
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623 OopClosure* keep_alive, |
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624 VoidClosure* complete_gc) { |
0 | 625 assert(!discovery_is_atomic(), "Error"); |
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626 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 627 while (iter.has_next()) { |
628 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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629 HeapWord* next_addr = java_lang_ref_Reference::next_addr(iter.obj()); |
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630 oop next = java_lang_ref_Reference::next(iter.obj()); |
0 | 631 if ((iter.referent() == NULL || iter.is_referent_alive() || |
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632 next != NULL)) { |
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633 assert(next->is_oop_or_null(), "bad next field"); |
0 | 634 // Remove Reference object from list |
635 iter.remove(); | |
636 // Trace the cohorts | |
637 iter.make_referent_alive(); | |
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638 if (UseCompressedOops) { |
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639 keep_alive->do_oop((narrowOop*)next_addr); |
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640 } else { |
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641 keep_alive->do_oop((oop*)next_addr); |
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642 } |
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643 iter.move_to_next(); |
0 | 644 } else { |
645 iter.next(); | |
646 } | |
647 } | |
648 // Now close the newly reachable set | |
649 complete_gc->do_void(); | |
650 NOT_PRODUCT( | |
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651 if (PrintGCDetails && TraceReferenceGC && (iter.processed() > 0)) { |
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652 gclog_or_tty->print_cr(" Dropped %d active Refs out of %d " |
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653 "Refs in discovered list " INTPTR_FORMAT, |
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654 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 655 } |
656 ) | |
657 } | |
658 | |
659 // Traverse the list and process the referents, by either | |
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660 // clearing them or keeping them (and their reachable |
0 | 661 // closure) alive. |
662 void | |
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663 ReferenceProcessor::process_phase3(DiscoveredList& refs_list, |
0 | 664 bool clear_referent, |
665 BoolObjectClosure* is_alive, | |
666 OopClosure* keep_alive, | |
667 VoidClosure* complete_gc) { | |
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668 ResourceMark rm; |
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669 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 670 while (iter.has_next()) { |
671 iter.update_discovered(); | |
672 iter.load_ptrs(DEBUG_ONLY(false /* allow_null_referent */)); | |
673 if (clear_referent) { | |
674 // NULL out referent pointer | |
675 iter.clear_referent(); | |
676 } else { | |
677 // keep the referent around | |
678 iter.make_referent_alive(); | |
679 } | |
680 if (TraceReferenceGC) { | |
681 gclog_or_tty->print_cr("Adding %sreference (" INTPTR_FORMAT ": %s) as pending", | |
682 clear_referent ? "cleared " : "", | |
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683 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 684 } |
685 assert(iter.obj()->is_oop(UseConcMarkSweepGC), "Adding a bad reference"); | |
686 iter.next(); | |
687 } | |
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688 // Remember to update the next pointer of the last ref. |
0 | 689 iter.update_discovered(); |
690 // Close the reachable set | |
691 complete_gc->do_void(); | |
692 } | |
693 | |
694 void | |
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695 ReferenceProcessor::clear_discovered_references(DiscoveredList& refs_list) { |
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696 oop obj = NULL; |
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697 oop next = refs_list.head(); |
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698 while (next != obj) { |
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699 obj = next; |
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700 next = java_lang_ref_Reference::discovered(obj); |
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701 java_lang_ref_Reference::set_discovered_raw(obj, NULL); |
0 | 702 } |
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703 refs_list.set_head(NULL); |
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704 refs_list.set_length(0); |
0 | 705 } |
706 | |
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707 void |
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708 ReferenceProcessor::abandon_partial_discovered_list(DiscoveredList& refs_list) { |
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709 clear_discovered_references(refs_list); |
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710 } |
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711 |
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712 void ReferenceProcessor::abandon_partial_discovery() { |
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713 // loop over the lists |
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714 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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715 if (TraceReferenceGC && PrintGCDetails && ((i % _max_num_q) == 0)) { |
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716 gclog_or_tty->print_cr("\nAbandoning %s discovered list", list_name(i)); |
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717 } |
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718 abandon_partial_discovered_list(_discovered_refs[i]); |
0 | 719 } |
720 } | |
721 | |
722 class RefProcPhase1Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
723 public: | |
724 RefProcPhase1Task(ReferenceProcessor& ref_processor, | |
725 DiscoveredList refs_lists[], | |
726 ReferencePolicy* policy, | |
727 bool marks_oops_alive) | |
728 : ProcessTask(ref_processor, refs_lists, marks_oops_alive), | |
729 _policy(policy) | |
730 { } | |
731 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
732 OopClosure& keep_alive, | |
733 VoidClosure& complete_gc) | |
734 { | |
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735 Thread* thr = Thread::current(); |
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736 int refs_list_index = ((WorkerThread*)thr)->id(); |
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737 _ref_processor.process_phase1(_refs_lists[refs_list_index], _policy, |
0 | 738 &is_alive, &keep_alive, &complete_gc); |
739 } | |
740 private: | |
741 ReferencePolicy* _policy; | |
742 }; | |
743 | |
744 class RefProcPhase2Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
745 public: | |
746 RefProcPhase2Task(ReferenceProcessor& ref_processor, | |
747 DiscoveredList refs_lists[], | |
748 bool marks_oops_alive) | |
749 : ProcessTask(ref_processor, refs_lists, marks_oops_alive) | |
750 { } | |
751 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
752 OopClosure& keep_alive, | |
753 VoidClosure& complete_gc) | |
754 { | |
755 _ref_processor.process_phase2(_refs_lists[i], | |
756 &is_alive, &keep_alive, &complete_gc); | |
757 } | |
758 }; | |
759 | |
760 class RefProcPhase3Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
761 public: | |
762 RefProcPhase3Task(ReferenceProcessor& ref_processor, | |
763 DiscoveredList refs_lists[], | |
764 bool clear_referent, | |
765 bool marks_oops_alive) | |
766 : ProcessTask(ref_processor, refs_lists, marks_oops_alive), | |
767 _clear_referent(clear_referent) | |
768 { } | |
769 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
770 OopClosure& keep_alive, | |
771 VoidClosure& complete_gc) | |
772 { | |
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773 // Don't use "refs_list_index" calculated in this way because |
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774 // balance_queues() has moved the Ref's into the first n queues. |
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775 // Thread* thr = Thread::current(); |
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776 // int refs_list_index = ((WorkerThread*)thr)->id(); |
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777 // _ref_processor.process_phase3(_refs_lists[refs_list_index], _clear_referent, |
0 | 778 _ref_processor.process_phase3(_refs_lists[i], _clear_referent, |
779 &is_alive, &keep_alive, &complete_gc); | |
780 } | |
781 private: | |
782 bool _clear_referent; | |
783 }; | |
784 | |
785 // Balances reference queues. | |
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786 // Move entries from all queues[0, 1, ..., _max_num_q-1] to |
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787 // queues[0, 1, ..., _num_q-1] because only the first _num_q |
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788 // corresponding to the active workers will be processed. |
0 | 789 void ReferenceProcessor::balance_queues(DiscoveredList ref_lists[]) |
790 { | |
791 // calculate total length | |
792 size_t total_refs = 0; | |
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793 if (TraceReferenceGC && PrintGCDetails) { |
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794 gclog_or_tty->print_cr("\nBalance ref_lists "); |
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795 } |
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796 |
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797 for (uint i = 0; i < _max_num_q; ++i) { |
0 | 798 total_refs += ref_lists[i].length(); |
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799 if (TraceReferenceGC && PrintGCDetails) { |
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800 gclog_or_tty->print("%d ", ref_lists[i].length()); |
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801 } |
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802 } |
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803 if (TraceReferenceGC && PrintGCDetails) { |
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804 gclog_or_tty->print_cr(" = %d", total_refs); |
0 | 805 } |
806 size_t avg_refs = total_refs / _num_q + 1; | |
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807 uint to_idx = 0; |
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808 for (uint from_idx = 0; from_idx < _max_num_q; from_idx++) { |
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809 bool move_all = false; |
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810 if (from_idx >= _num_q) { |
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811 move_all = ref_lists[from_idx].length() > 0; |
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812 } |
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813 while ((ref_lists[from_idx].length() > avg_refs) || |
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814 move_all) { |
0 | 815 assert(to_idx < _num_q, "Sanity Check!"); |
816 if (ref_lists[to_idx].length() < avg_refs) { | |
817 // move superfluous refs | |
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818 size_t refs_to_move; |
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819 // Move all the Ref's if the from queue will not be processed. |
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820 if (move_all) { |
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821 refs_to_move = MIN2(ref_lists[from_idx].length(), |
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822 avg_refs - ref_lists[to_idx].length()); |
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823 } else { |
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824 refs_to_move = MIN2(ref_lists[from_idx].length() - avg_refs, |
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825 avg_refs - ref_lists[to_idx].length()); |
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826 } |
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827 |
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828 assert(refs_to_move > 0, "otherwise the code below will fail"); |
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829 |
0 | 830 oop move_head = ref_lists[from_idx].head(); |
831 oop move_tail = move_head; | |
832 oop new_head = move_head; | |
833 // find an element to split the list on | |
834 for (size_t j = 0; j < refs_to_move; ++j) { | |
835 move_tail = new_head; | |
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836 new_head = java_lang_ref_Reference::discovered(new_head); |
0 | 837 } |
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838 |
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839 // Add the chain to the to list. |
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840 if (ref_lists[to_idx].head() == NULL) { |
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841 // to list is empty. Make a loop at the end. |
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842 java_lang_ref_Reference::set_discovered_raw(move_tail, move_tail); |
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843 } else { |
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844 java_lang_ref_Reference::set_discovered_raw(move_tail, ref_lists[to_idx].head()); |
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845 } |
0 | 846 ref_lists[to_idx].set_head(move_head); |
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847 ref_lists[to_idx].inc_length(refs_to_move); |
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848 |
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849 // Remove the chain from the from list. |
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850 if (move_tail == new_head) { |
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851 // We found the end of the from list. |
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852 ref_lists[from_idx].set_head(NULL); |
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853 } else { |
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854 ref_lists[from_idx].set_head(new_head); |
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855 } |
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856 ref_lists[from_idx].dec_length(refs_to_move); |
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857 if (ref_lists[from_idx].length() == 0) { |
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858 break; |
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859 } |
0 | 860 } else { |
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861 to_idx = (to_idx + 1) % _num_q; |
0 | 862 } |
863 } | |
864 } | |
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865 #ifdef ASSERT |
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866 size_t balanced_total_refs = 0; |
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867 for (uint i = 0; i < _max_num_q; ++i) { |
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868 balanced_total_refs += ref_lists[i].length(); |
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869 if (TraceReferenceGC && PrintGCDetails) { |
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870 gclog_or_tty->print("%d ", ref_lists[i].length()); |
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871 } |
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872 } |
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873 if (TraceReferenceGC && PrintGCDetails) { |
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874 gclog_or_tty->print_cr(" = %d", balanced_total_refs); |
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875 gclog_or_tty->flush(); |
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876 } |
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877 assert(total_refs == balanced_total_refs, "Balancing was incomplete"); |
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878 #endif |
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879 } |
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880 |
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881 void ReferenceProcessor::balance_all_queues() { |
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882 balance_queues(_discoveredSoftRefs); |
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883 balance_queues(_discoveredWeakRefs); |
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884 balance_queues(_discoveredFinalRefs); |
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885 balance_queues(_discoveredPhantomRefs); |
0 | 886 } |
887 | |
10405 | 888 size_t |
0 | 889 ReferenceProcessor::process_discovered_reflist( |
890 DiscoveredList refs_lists[], | |
891 ReferencePolicy* policy, | |
892 bool clear_referent, | |
893 BoolObjectClosure* is_alive, | |
894 OopClosure* keep_alive, | |
895 VoidClosure* complete_gc, | |
896 AbstractRefProcTaskExecutor* task_executor) | |
897 { | |
1833
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898 bool mt_processing = task_executor != NULL && _processing_is_mt; |
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899 // If discovery used MT and a dynamic number of GC threads, then |
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900 // the queues must be balanced for correctness if fewer than the |
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901 // maximum number of queues were used. The number of queue used |
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902 // during discovery may be different than the number to be used |
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903 // for processing so don't depend of _num_q < _max_num_q as part |
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904 // of the test. |
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905 bool must_balance = _discovery_is_mt; |
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906 |
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907 if ((mt_processing && ParallelRefProcBalancingEnabled) || |
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908 must_balance) { |
0 | 909 balance_queues(refs_lists); |
910 } | |
10405 | 911 |
912 size_t total_list_count = total_count(refs_lists); | |
913 | |
0 | 914 if (PrintReferenceGC && PrintGCDetails) { |
10405 | 915 gclog_or_tty->print(", %u refs", total_list_count); |
0 | 916 } |
917 | |
918 // Phase 1 (soft refs only): | |
919 // . Traverse the list and remove any SoftReferences whose | |
920 // referents are not alive, but that should be kept alive for | |
921 // policy reasons. Keep alive the transitive closure of all | |
922 // such referents. | |
923 if (policy != NULL) { | |
1833
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924 if (mt_processing) { |
0 | 925 RefProcPhase1Task phase1(*this, refs_lists, policy, true /*marks_oops_alive*/); |
926 task_executor->execute(phase1); | |
927 } else { | |
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928 for (uint i = 0; i < _max_num_q; i++) { |
0 | 929 process_phase1(refs_lists[i], policy, |
930 is_alive, keep_alive, complete_gc); | |
931 } | |
932 } | |
933 } else { // policy == NULL | |
934 assert(refs_lists != _discoveredSoftRefs, | |
935 "Policy must be specified for soft references."); | |
936 } | |
937 | |
938 // Phase 2: | |
939 // . Traverse the list and remove any refs whose referents are alive. | |
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940 if (mt_processing) { |
0 | 941 RefProcPhase2Task phase2(*this, refs_lists, !discovery_is_atomic() /*marks_oops_alive*/); |
942 task_executor->execute(phase2); | |
943 } else { | |
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944 for (uint i = 0; i < _max_num_q; i++) { |
0 | 945 process_phase2(refs_lists[i], is_alive, keep_alive, complete_gc); |
946 } | |
947 } | |
948 | |
949 // Phase 3: | |
950 // . Traverse the list and process referents as appropriate. | |
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951 if (mt_processing) { |
0 | 952 RefProcPhase3Task phase3(*this, refs_lists, clear_referent, true /*marks_oops_alive*/); |
953 task_executor->execute(phase3); | |
954 } else { | |
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955 for (uint i = 0; i < _max_num_q; i++) { |
0 | 956 process_phase3(refs_lists[i], clear_referent, |
957 is_alive, keep_alive, complete_gc); | |
958 } | |
959 } | |
10405 | 960 |
961 return total_list_count; | |
0 | 962 } |
963 | |
964 void ReferenceProcessor::clean_up_discovered_references() { | |
965 // loop over the lists | |
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966 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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967 if (TraceReferenceGC && PrintGCDetails && ((i % _max_num_q) == 0)) { |
0 | 968 gclog_or_tty->print_cr( |
969 "\nScrubbing %s discovered list of Null referents", | |
970 list_name(i)); | |
971 } | |
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972 clean_up_discovered_reflist(_discovered_refs[i]); |
0 | 973 } |
974 } | |
975 | |
976 void ReferenceProcessor::clean_up_discovered_reflist(DiscoveredList& refs_list) { | |
977 assert(!discovery_is_atomic(), "Else why call this method?"); | |
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978 DiscoveredListIterator iter(refs_list, NULL, NULL); |
0 | 979 while (iter.has_next()) { |
980 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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981 oop next = java_lang_ref_Reference::next(iter.obj()); |
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982 assert(next->is_oop_or_null(), "bad next field"); |
0 | 983 // If referent has been cleared or Reference is not active, |
984 // drop it. | |
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985 if (iter.referent() == NULL || next != NULL) { |
0 | 986 debug_only( |
987 if (PrintGCDetails && TraceReferenceGC) { | |
988 gclog_or_tty->print_cr("clean_up_discovered_list: Dropping Reference: " | |
989 INTPTR_FORMAT " with next field: " INTPTR_FORMAT | |
990 " and referent: " INTPTR_FORMAT, | |
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991 (void *)iter.obj(), (void *)next, (void *)iter.referent()); |
0 | 992 } |
993 ) | |
994 // Remove Reference object from list | |
995 iter.remove(); | |
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996 iter.move_to_next(); |
0 | 997 } else { |
998 iter.next(); | |
999 } | |
1000 } | |
1001 NOT_PRODUCT( | |
1002 if (PrintGCDetails && TraceReferenceGC) { | |
1003 gclog_or_tty->print( | |
1004 " Removed %d Refs with NULL referents out of %d discovered Refs", | |
1005 iter.removed(), iter.processed()); | |
1006 } | |
1007 ) | |
1008 } | |
1009 | |
1010 inline DiscoveredList* ReferenceProcessor::get_discovered_list(ReferenceType rt) { | |
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1011 uint id = 0; |
0 | 1012 // Determine the queue index to use for this object. |
1013 if (_discovery_is_mt) { | |
1014 // During a multi-threaded discovery phase, | |
1015 // each thread saves to its "own" list. | |
1016 Thread* thr = Thread::current(); | |
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1017 id = thr->as_Worker_thread()->id(); |
0 | 1018 } else { |
1019 // single-threaded discovery, we save in round-robin | |
1020 // fashion to each of the lists. | |
1021 if (_processing_is_mt) { | |
1022 id = next_id(); | |
1023 } | |
1024 } | |
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1025 assert(0 <= id && id < _max_num_q, "Id is out-of-bounds (call Freud?)"); |
0 | 1026 |
1027 // Get the discovered queue to which we will add | |
1028 DiscoveredList* list = NULL; | |
1029 switch (rt) { | |
1030 case REF_OTHER: | |
1031 // Unknown reference type, no special treatment | |
1032 break; | |
1033 case REF_SOFT: | |
1034 list = &_discoveredSoftRefs[id]; | |
1035 break; | |
1036 case REF_WEAK: | |
1037 list = &_discoveredWeakRefs[id]; | |
1038 break; | |
1039 case REF_FINAL: | |
1040 list = &_discoveredFinalRefs[id]; | |
1041 break; | |
1042 case REF_PHANTOM: | |
1043 list = &_discoveredPhantomRefs[id]; | |
1044 break; | |
1045 case REF_NONE: | |
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1046 // we should not reach here if we are an InstanceRefKlass |
0 | 1047 default: |
1048 ShouldNotReachHere(); | |
1049 } | |
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1050 if (TraceReferenceGC && PrintGCDetails) { |
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1051 gclog_or_tty->print_cr("Thread %d gets list " INTPTR_FORMAT, id, list); |
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1052 } |
0 | 1053 return list; |
1054 } | |
1055 | |
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1056 inline void |
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1057 ReferenceProcessor::add_to_discovered_list_mt(DiscoveredList& refs_list, |
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1058 oop obj, |
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1059 HeapWord* discovered_addr) { |
0 | 1060 assert(_discovery_is_mt, "!_discovery_is_mt should have been handled by caller"); |
1061 // First we must make sure this object is only enqueued once. CAS in a non null | |
1062 // discovered_addr. | |
342
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1063 oop current_head = refs_list.head(); |
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1064 // The last ref must have its discovered field pointing to itself. |
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1065 oop next_discovered = (current_head != NULL) ? current_head : obj; |
342
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1066 |
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1067 oop retest = oopDesc::atomic_compare_exchange_oop(next_discovered, discovered_addr, |
113
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1068 NULL); |
0 | 1069 if (retest == NULL) { |
1070 // This thread just won the right to enqueue the object. | |
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1071 // We have separate lists for enqueueing, so no synchronization |
0 | 1072 // is necessary. |
113
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1073 refs_list.set_head(obj); |
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1074 refs_list.inc_length(1); |
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1075 |
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1076 if (TraceReferenceGC) { |
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1077 gclog_or_tty->print_cr("Discovered reference (mt) (" INTPTR_FORMAT ": %s)", |
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1078 (void *)obj, obj->klass()->internal_name()); |
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1079 } |
0 | 1080 } else { |
1081 // If retest was non NULL, another thread beat us to it: | |
1082 // The reference has already been discovered... | |
1083 if (TraceReferenceGC) { | |
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1084 gclog_or_tty->print_cr("Already discovered reference (" INTPTR_FORMAT ": %s)", |
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1085 (void *)obj, obj->klass()->internal_name()); |
0 | 1086 } |
1087 } | |
1088 } | |
1089 | |
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1090 #ifndef PRODUCT |
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1091 // Non-atomic (i.e. concurrent) discovery might allow us |
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1092 // to observe j.l.References with NULL referents, being those |
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1093 // cleared concurrently by mutators during (or after) discovery. |
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1094 void ReferenceProcessor::verify_referent(oop obj) { |
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1095 bool da = discovery_is_atomic(); |
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1096 oop referent = java_lang_ref_Reference::referent(obj); |
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1097 assert(da ? referent->is_oop() : referent->is_oop_or_null(), |
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1098 err_msg("Bad referent " INTPTR_FORMAT " found in Reference " |
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1099 INTPTR_FORMAT " during %satomic discovery ", |
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1100 (void *)referent, (void *)obj, da ? "" : "non-")); |
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1101 } |
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1102 #endif |
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1103 |
0 | 1104 // We mention two of several possible choices here: |
1105 // #0: if the reference object is not in the "originating generation" | |
1106 // (or part of the heap being collected, indicated by our "span" | |
1107 // we don't treat it specially (i.e. we scan it as we would | |
1108 // a normal oop, treating its references as strong references). | |
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1109 // This means that references can't be discovered unless their |
0 | 1110 // referent is also in the same span. This is the simplest, |
1111 // most "local" and most conservative approach, albeit one | |
1112 // that may cause weak references to be enqueued least promptly. | |
1113 // We call this choice the "ReferenceBasedDiscovery" policy. | |
1114 // #1: the reference object may be in any generation (span), but if | |
1115 // the referent is in the generation (span) being currently collected | |
1116 // then we can discover the reference object, provided | |
1117 // the object has not already been discovered by | |
1118 // a different concurrently running collector (as may be the | |
1119 // case, for instance, if the reference object is in CMS and | |
1120 // the referent in DefNewGeneration), and provided the processing | |
1121 // of this reference object by the current collector will | |
1122 // appear atomic to every other collector in the system. | |
1123 // (Thus, for instance, a concurrent collector may not | |
1124 // discover references in other generations even if the | |
1125 // referent is in its own generation). This policy may, | |
1126 // in certain cases, enqueue references somewhat sooner than | |
1127 // might Policy #0 above, but at marginally increased cost | |
1128 // and complexity in processing these references. | |
1129 // We call this choice the "RefeferentBasedDiscovery" policy. | |
1130 bool ReferenceProcessor::discover_reference(oop obj, ReferenceType rt) { | |
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1131 // Make sure we are discovering refs (rather than processing discovered refs). |
0 | 1132 if (!_discovering_refs || !RegisterReferences) { |
1133 return false; | |
1134 } | |
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1135 // We only discover active references. |
113
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1136 oop next = java_lang_ref_Reference::next(obj); |
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1137 if (next != NULL) { // Ref is no longer active |
0 | 1138 return false; |
1139 } | |
1140 | |
1141 HeapWord* obj_addr = (HeapWord*)obj; | |
1142 if (RefDiscoveryPolicy == ReferenceBasedDiscovery && | |
1143 !_span.contains(obj_addr)) { | |
1144 // Reference is not in the originating generation; | |
1145 // don't treat it specially (i.e. we want to scan it as a normal | |
1146 // object with strong references). | |
1147 return false; | |
1148 } | |
1149 | |
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1150 // We only discover references whose referents are not (yet) |
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1151 // known to be strongly reachable. |
0 | 1152 if (is_alive_non_header() != NULL) { |
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1153 verify_referent(obj); |
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1154 if (is_alive_non_header()->do_object_b(java_lang_ref_Reference::referent(obj))) { |
0 | 1155 return false; // referent is reachable |
1156 } | |
1157 } | |
453
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1158 if (rt == REF_SOFT) { |
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1159 // For soft refs we can decide now if these are not |
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1160 // current candidates for clearing, in which case we |
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1161 // can mark through them now, rather than delaying that |
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1162 // to the reference-processing phase. Since all current |
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1163 // time-stamp policies advance the soft-ref clock only |
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1164 // at a major collection cycle, this is always currently |
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1165 // accurate. |
3992
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1166 if (!_current_soft_ref_policy->should_clear_reference(obj, _soft_ref_timestamp_clock)) { |
453
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1167 return false; |
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1168 } |
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|
1169 } |
0 | 1170 |
3979
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|
1171 ResourceMark rm; // Needed for tracing. |
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1172 |
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1173 HeapWord* const discovered_addr = java_lang_ref_Reference::discovered_addr(obj); |
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1174 const oop discovered = java_lang_ref_Reference::discovered(obj); |
113
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1175 assert(discovered->is_oop_or_null(), "bad discovered field"); |
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1176 if (discovered != NULL) { |
0 | 1177 // The reference has already been discovered... |
1178 if (TraceReferenceGC) { | |
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1179 gclog_or_tty->print_cr("Already discovered reference (" INTPTR_FORMAT ": %s)", |
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1180 (void *)obj, obj->klass()->internal_name()); |
0 | 1181 } |
1182 if (RefDiscoveryPolicy == ReferentBasedDiscovery) { | |
1183 // assumes that an object is not processed twice; | |
1184 // if it's been already discovered it must be on another | |
1185 // generation's discovered list; so we won't discover it. | |
1186 return false; | |
1187 } else { | |
1188 assert(RefDiscoveryPolicy == ReferenceBasedDiscovery, | |
1189 "Unrecognized policy"); | |
1190 // Check assumption that an object is not potentially | |
1191 // discovered twice except by concurrent collectors that potentially | |
1192 // trace the same Reference object twice. | |
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1193 assert(UseConcMarkSweepGC || UseG1GC, |
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1194 "Only possible with a concurrent marking collector"); |
0 | 1195 return true; |
1196 } | |
1197 } | |
1198 | |
1199 if (RefDiscoveryPolicy == ReferentBasedDiscovery) { | |
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1200 verify_referent(obj); |
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1201 // Discover if and only if EITHER: |
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1202 // .. reference is in our span, OR |
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1203 // .. we are an atomic collector and referent is in our span |
0 | 1204 if (_span.contains(obj_addr) || |
1995
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1205 (discovery_is_atomic() && |
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1206 _span.contains(java_lang_ref_Reference::referent(obj)))) { |
0 | 1207 // should_enqueue = true; |
1208 } else { | |
1209 return false; | |
1210 } | |
1211 } else { | |
1212 assert(RefDiscoveryPolicy == ReferenceBasedDiscovery && | |
1213 _span.contains(obj_addr), "code inconsistency"); | |
1214 } | |
1215 | |
1216 // Get the right type of discovered queue head. | |
1217 DiscoveredList* list = get_discovered_list(rt); | |
1218 if (list == NULL) { | |
1219 return false; // nothing special needs to be done | |
1220 } | |
1221 | |
1222 if (_discovery_is_mt) { | |
1223 add_to_discovered_list_mt(*list, obj, discovered_addr); | |
1224 } else { | |
17976
8e20ef014b08
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
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1225 // We do a raw store here: the field will be visited later when processing |
8e20ef014b08
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1226 // the discovered references. |
342
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1227 oop current_head = list->head(); |
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1228 // The last ref must have its discovered field pointing to itself. |
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1229 oop next_discovered = (current_head != NULL) ? current_head : obj; |
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1230 |
342
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1231 assert(discovered == NULL, "control point invariant"); |
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|
1232 oop_store_raw(discovered_addr, next_discovered); |
0 | 1233 list->set_head(obj); |
452
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|
1234 list->inc_length(1); |
0 | 1235 |
1974
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|
1236 if (TraceReferenceGC) { |
3917
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|
1237 gclog_or_tty->print_cr("Discovered reference (" INTPTR_FORMAT ": %s)", |
12316
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|
1238 (void *)obj, obj->klass()->internal_name()); |
0 | 1239 } |
1240 } | |
3917
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|
1241 assert(obj->is_oop(), "Discovered a bad reference"); |
1995
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|
1242 verify_referent(obj); |
0 | 1243 return true; |
1244 } | |
1245 | |
1246 // Preclean the discovered references by removing those | |
1247 // whose referents are alive, and by marking from those that | |
1248 // are not active. These lists can be handled here | |
1249 // in any order and, indeed, concurrently. | |
1250 void ReferenceProcessor::preclean_discovered_references( | |
1251 BoolObjectClosure* is_alive, | |
1252 OopClosure* keep_alive, | |
1253 VoidClosure* complete_gc, | |
10405 | 1254 YieldClosure* yield, |
20190
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|
1255 GCTimer* gc_timer, |
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|
1256 GCId gc_id) { |
0 | 1257 |
1258 NOT_PRODUCT(verify_ok_to_handle_reflists()); | |
1259 | |
1260 // Soft references | |
1261 { | |
10405 | 1262 GCTraceTime tt("Preclean SoftReferences", PrintGCDetails && PrintReferenceGC, |
20190
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|
1263 false, gc_timer, gc_id); |
4728
441e946dc1af
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4712
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|
1264 for (uint i = 0; i < _max_num_q; i++) { |
452
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|
1265 if (yield->should_return()) { |
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|
1266 return; |
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356
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|
1267 } |
0 | 1268 preclean_discovered_reflist(_discoveredSoftRefs[i], is_alive, |
1269 keep_alive, complete_gc, yield); | |
1270 } | |
1271 } | |
1272 | |
1273 // Weak references | |
1274 { | |
10405 | 1275 GCTraceTime tt("Preclean WeakReferences", PrintGCDetails && PrintReferenceGC, |
20190
0982ec23da03
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17976
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|
1276 false, gc_timer, gc_id); |
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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4712
diff
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|
1277 for (uint i = 0; i < _max_num_q; i++) { |
452
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1278 if (yield->should_return()) { |
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1279 return; |
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1280 } |
0 | 1281 preclean_discovered_reflist(_discoveredWeakRefs[i], is_alive, |
1282 keep_alive, complete_gc, yield); | |
1283 } | |
1284 } | |
1285 | |
1286 // Final references | |
1287 { | |
10405 | 1288 GCTraceTime tt("Preclean FinalReferences", PrintGCDetails && PrintReferenceGC, |
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1289 false, gc_timer, gc_id); |
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1290 for (uint i = 0; i < _max_num_q; i++) { |
452
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1291 if (yield->should_return()) { |
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1292 return; |
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1293 } |
0 | 1294 preclean_discovered_reflist(_discoveredFinalRefs[i], is_alive, |
1295 keep_alive, complete_gc, yield); | |
1296 } | |
1297 } | |
1298 | |
1299 // Phantom references | |
1300 { | |
10405 | 1301 GCTraceTime tt("Preclean PhantomReferences", PrintGCDetails && PrintReferenceGC, |
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1302 false, gc_timer, gc_id); |
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1303 for (uint i = 0; i < _max_num_q; i++) { |
452
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1304 if (yield->should_return()) { |
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1305 return; |
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1306 } |
0 | 1307 preclean_discovered_reflist(_discoveredPhantomRefs[i], is_alive, |
1308 keep_alive, complete_gc, yield); | |
1309 } | |
1310 } | |
1311 } | |
1312 | |
1313 // Walk the given discovered ref list, and remove all reference objects | |
1314 // whose referents are still alive, whose referents are NULL or which | |
452
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1315 // are not active (have a non-NULL next field). NOTE: When we are |
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1316 // thus precleaning the ref lists (which happens single-threaded today), |
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1317 // we do not disable refs discovery to honour the correct semantics of |
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1318 // java.lang.Reference. As a result, we need to be careful below |
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1319 // that ref removal steps interleave safely with ref discovery steps |
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1320 // (in this thread). |
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1321 void |
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1322 ReferenceProcessor::preclean_discovered_reflist(DiscoveredList& refs_list, |
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1323 BoolObjectClosure* is_alive, |
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1324 OopClosure* keep_alive, |
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1325 VoidClosure* complete_gc, |
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1326 YieldClosure* yield) { |
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1327 DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
0 | 1328 while (iter.has_next()) { |
1329 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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1330 oop obj = iter.obj(); |
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1331 oop next = java_lang_ref_Reference::next(obj); |
0 | 1332 if (iter.referent() == NULL || iter.is_referent_alive() || |
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1333 next != NULL) { |
0 | 1334 // The referent has been cleared, or is alive, or the Reference is not |
1335 // active; we need to trace and mark its cohort. | |
1336 if (TraceReferenceGC) { | |
1337 gclog_or_tty->print_cr("Precleaning Reference (" INTPTR_FORMAT ": %s)", | |
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1338 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 1339 } |
1340 // Remove Reference object from list | |
1341 iter.remove(); | |
1342 // Keep alive its cohort. | |
1343 iter.make_referent_alive(); | |
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1344 if (UseCompressedOops) { |
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1345 narrowOop* next_addr = (narrowOop*)java_lang_ref_Reference::next_addr(obj); |
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1346 keep_alive->do_oop(next_addr); |
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1347 } else { |
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1348 oop* next_addr = (oop*)java_lang_ref_Reference::next_addr(obj); |
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1349 keep_alive->do_oop(next_addr); |
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1350 } |
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1351 iter.move_to_next(); |
0 | 1352 } else { |
1353 iter.next(); | |
1354 } | |
1355 } | |
1356 // Close the reachable set | |
1357 complete_gc->do_void(); | |
1358 | |
1359 NOT_PRODUCT( | |
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1360 if (PrintGCDetails && PrintReferenceGC && (iter.processed() > 0)) { |
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1361 gclog_or_tty->print_cr(" Dropped %d Refs out of %d " |
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1362 "Refs in discovered list " INTPTR_FORMAT, |
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1363 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 1364 } |
1365 ) | |
1366 } | |
1367 | |
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1368 const char* ReferenceProcessor::list_name(uint i) { |
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1369 assert(i >= 0 && i <= _max_num_q * number_of_subclasses_of_ref(), |
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1370 "Out of bounds index"); |
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1371 |
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1372 int j = i / _max_num_q; |
0 | 1373 switch (j) { |
1374 case 0: return "SoftRef"; | |
1375 case 1: return "WeakRef"; | |
1376 case 2: return "FinalRef"; | |
1377 case 3: return "PhantomRef"; | |
1378 } | |
1379 ShouldNotReachHere(); | |
1380 return NULL; | |
1381 } | |
1382 | |
1383 #ifndef PRODUCT | |
1384 void ReferenceProcessor::verify_ok_to_handle_reflists() { | |
1385 // empty for now | |
1386 } | |
1387 #endif | |
1388 | |
1389 #ifndef PRODUCT | |
1390 void ReferenceProcessor::clear_discovered_references() { | |
1391 guarantee(!_discovering_refs, "Discovering refs?"); | |
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1392 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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1393 clear_discovered_references(_discovered_refs[i]); |
0 | 1394 } |
1395 } | |
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1396 |
0 | 1397 #endif // PRODUCT |