Mercurial > hg > truffle
annotate src/share/vm/memory/referenceProcessor.cpp @ 14517:3812c088b945
Merge
author | lana |
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date | Thu, 06 Mar 2014 10:37:26 -0800 |
parents | e5d78f318aec |
children | d8041d695d19 |
rev | line source |
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0 | 1 /* |
10405 | 2 * Copyright (c) 2001, 2013, 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 ReferencePolicy* ReferenceProcessor::_always_clear_soft_ref_policy = NULL; |
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39 ReferencePolicy* ReferenceProcessor::_default_soft_ref_policy = NULL; |
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40 bool ReferenceProcessor::_pending_list_uses_discovered_field = false; |
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41 jlong ReferenceProcessor::_soft_ref_timestamp_clock = 0; |
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42 |
0 | 43 void referenceProcessor_init() { |
44 ReferenceProcessor::init_statics(); | |
45 } | |
46 | |
47 void ReferenceProcessor::init_statics() { | |
14309 | 48 // We need a monotonically non-decreasing time in ms but |
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49 // os::javaTimeMillis() does not guarantee monotonicity. |
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50 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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51 |
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52 // Initialize the soft ref timestamp clock. |
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53 _soft_ref_timestamp_clock = now; |
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54 // Also update the soft ref clock in j.l.r.SoftReference |
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55 java_lang_ref_SoftReference::set_clock(_soft_ref_timestamp_clock); |
0 | 56 |
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57 _always_clear_soft_ref_policy = new AlwaysClearPolicy(); |
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58 _default_soft_ref_policy = new COMPILER2_PRESENT(LRUMaxHeapPolicy()) |
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59 NOT_COMPILER2(LRUCurrentHeapPolicy()); |
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60 if (_always_clear_soft_ref_policy == NULL || _default_soft_ref_policy == NULL) { |
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61 vm_exit_during_initialization("Could not allocate reference policy object"); |
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62 } |
0 | 63 guarantee(RefDiscoveryPolicy == ReferenceBasedDiscovery || |
64 RefDiscoveryPolicy == ReferentBasedDiscovery, | |
14358 | 65 "Unrecognized RefDiscoveryPolicy"); |
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66 _pending_list_uses_discovered_field = JDK_Version::current().pending_list_uses_discovered_field(); |
0 | 67 } |
68 | |
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69 void ReferenceProcessor::enable_discovery(bool verify_disabled, bool check_no_refs) { |
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70 #ifdef ASSERT |
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71 // Verify that we're not currently discovering refs |
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72 assert(!verify_disabled || !_discovering_refs, "nested call?"); |
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73 |
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74 if (check_no_refs) { |
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75 // Verify that the discovered lists are empty |
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76 verify_no_references_recorded(); |
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77 } |
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78 #endif // ASSERT |
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79 |
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80 // Someone could have modified the value of the static |
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81 // field in the j.l.r.SoftReference class that holds the |
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82 // soft reference timestamp clock using reflection or |
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83 // Unsafe between GCs. Unconditionally update the static |
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84 // field in ReferenceProcessor here so that we use the new |
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85 // value during reference discovery. |
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86 |
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87 _soft_ref_timestamp_clock = java_lang_ref_SoftReference::clock(); |
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88 _discovering_refs = true; |
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89 } |
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90 |
0 | 91 ReferenceProcessor::ReferenceProcessor(MemRegion span, |
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92 bool mt_processing, |
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93 uint mt_processing_degree, |
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94 bool mt_discovery, |
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95 uint mt_discovery_degree, |
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96 bool atomic_discovery, |
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97 BoolObjectClosure* is_alive_non_header, |
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98 bool discovered_list_needs_post_barrier) : |
0 | 99 _discovering_refs(false), |
100 _enqueuing_is_done(false), | |
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101 _is_alive_non_header(is_alive_non_header), |
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102 _discovered_list_needs_post_barrier(discovered_list_needs_post_barrier), |
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 |
14309 | 155 // We need a monotonically non-decreasing 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). |
14309 | 171 // In product mode, however, protect ourselves from non-monotonicity. |
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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, |
193 GCTimer* gc_timer) { | |
0 | 194 NOT_PRODUCT(verify_ok_to_handle_reflists()); |
195 | |
196 assert(!enqueuing_is_done(), "If here enqueuing should not be complete"); | |
197 // Stop treating discovered references specially. | |
198 disable_discovery(); | |
199 | |
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200 // If discovery was concurrent, someone could have modified |
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201 // the value of the static field in the j.l.r.SoftReference |
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202 // class that holds the soft reference timestamp clock using |
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203 // reflection or Unsafe between when discovery was enabled and |
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204 // now. Unconditionally update the static field in ReferenceProcessor |
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205 // here so that we use the new value during processing of the |
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206 // discovered soft refs. |
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207 |
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208 _soft_ref_timestamp_clock = java_lang_ref_SoftReference::clock(); |
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209 |
0 | 210 bool trace_time = PrintGCDetails && PrintReferenceGC; |
10405 | 211 |
0 | 212 // Soft references |
10405 | 213 size_t soft_count = 0; |
0 | 214 { |
10405 | 215 GCTraceTime tt("SoftReference", trace_time, false, gc_timer); |
216 soft_count = | |
217 process_discovered_reflist(_discoveredSoftRefs, _current_soft_ref_policy, true, | |
218 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 219 } |
220 | |
221 update_soft_ref_master_clock(); | |
222 | |
223 // Weak references | |
10405 | 224 size_t weak_count = 0; |
0 | 225 { |
10405 | 226 GCTraceTime tt("WeakReference", trace_time, false, gc_timer); |
227 weak_count = | |
228 process_discovered_reflist(_discoveredWeakRefs, NULL, true, | |
229 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 230 } |
231 | |
232 // Final references | |
10405 | 233 size_t final_count = 0; |
0 | 234 { |
10405 | 235 GCTraceTime tt("FinalReference", trace_time, false, gc_timer); |
236 final_count = | |
237 process_discovered_reflist(_discoveredFinalRefs, NULL, false, | |
238 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 239 } |
240 | |
241 // Phantom references | |
10405 | 242 size_t phantom_count = 0; |
0 | 243 { |
10405 | 244 GCTraceTime tt("PhantomReference", trace_time, false, gc_timer); |
245 phantom_count = | |
246 process_discovered_reflist(_discoveredPhantomRefs, NULL, false, | |
247 is_alive, keep_alive, complete_gc, task_executor); | |
0 | 248 } |
249 | |
250 // Weak global JNI references. It would make more sense (semantically) to | |
251 // traverse these simultaneously with the regular weak references above, but | |
252 // that is not how the JDK1.2 specification is. See #4126360. Native code can | |
253 // thus use JNI weak references to circumvent the phantom references and | |
254 // resurrect a "post-mortem" object. | |
255 { | |
10405 | 256 GCTraceTime tt("JNI Weak Reference", trace_time, false, gc_timer); |
0 | 257 if (task_executor != NULL) { |
258 task_executor->set_single_threaded_mode(); | |
259 } | |
260 process_phaseJNI(is_alive, keep_alive, complete_gc); | |
261 } | |
10405 | 262 |
263 return ReferenceProcessorStats(soft_count, weak_count, final_count, phantom_count); | |
0 | 264 } |
265 | |
266 #ifndef PRODUCT | |
267 // Calculate the number of jni handles. | |
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268 uint ReferenceProcessor::count_jni_refs() { |
0 | 269 class AlwaysAliveClosure: public BoolObjectClosure { |
270 public: | |
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271 virtual bool do_object_b(oop obj) { return true; } |
0 | 272 }; |
273 | |
274 class CountHandleClosure: public OopClosure { | |
275 private: | |
276 int _count; | |
277 public: | |
278 CountHandleClosure(): _count(0) {} | |
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279 void do_oop(oop* unused) { _count++; } |
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280 void do_oop(narrowOop* unused) { ShouldNotReachHere(); } |
0 | 281 int count() { return _count; } |
282 }; | |
283 CountHandleClosure global_handle_count; | |
284 AlwaysAliveClosure always_alive; | |
285 JNIHandles::weak_oops_do(&always_alive, &global_handle_count); | |
286 return global_handle_count.count(); | |
287 } | |
288 #endif | |
289 | |
290 void ReferenceProcessor::process_phaseJNI(BoolObjectClosure* is_alive, | |
291 OopClosure* keep_alive, | |
292 VoidClosure* complete_gc) { | |
293 #ifndef PRODUCT | |
294 if (PrintGCDetails && PrintReferenceGC) { | |
295 unsigned int count = count_jni_refs(); | |
296 gclog_or_tty->print(", %u refs", count); | |
297 } | |
298 #endif | |
299 JNIHandles::weak_oops_do(is_alive, keep_alive); | |
300 complete_gc->do_void(); | |
301 } | |
302 | |
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303 |
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304 template <class T> |
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305 bool enqueue_discovered_ref_helper(ReferenceProcessor* ref, |
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306 AbstractRefProcTaskExecutor* task_executor) { |
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307 |
0 | 308 // Remember old value of pending references list |
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309 T* pending_list_addr = (T*)java_lang_ref_Reference::pending_list_addr(); |
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310 T old_pending_list_value = *pending_list_addr; |
0 | 311 |
312 // Enqueue references that are not made active again, and | |
313 // clear the decks for the next collection (cycle). | |
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314 ref->enqueue_discovered_reflists((HeapWord*)pending_list_addr, task_executor); |
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315 // Do the post-barrier on pending_list_addr missed in |
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316 // enqueue_discovered_reflist. |
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317 oopDesc::bs()->write_ref_field(pending_list_addr, oopDesc::load_decode_heap_oop(pending_list_addr)); |
0 | 318 |
319 // Stop treating discovered references specially. | |
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320 ref->disable_discovery(); |
0 | 321 |
322 // Return true if new pending references were added | |
323 return old_pending_list_value != *pending_list_addr; | |
324 } | |
325 | |
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326 bool ReferenceProcessor::enqueue_discovered_references(AbstractRefProcTaskExecutor* task_executor) { |
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327 NOT_PRODUCT(verify_ok_to_handle_reflists()); |
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328 if (UseCompressedOops) { |
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329 return enqueue_discovered_ref_helper<narrowOop>(this, task_executor); |
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330 } else { |
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331 return enqueue_discovered_ref_helper<oop>(this, task_executor); |
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332 } |
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333 } |
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334 |
0 | 335 void ReferenceProcessor::enqueue_discovered_reflist(DiscoveredList& refs_list, |
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336 HeapWord* pending_list_addr) { |
0 | 337 // Given a list of refs linked through the "discovered" field |
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338 // (java.lang.ref.Reference.discovered), self-loop their "next" field |
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339 // thus distinguishing them from active References, then |
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340 // prepend them to the pending list. |
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341 // BKWRD COMPATIBILITY NOTE: For older JDKs (prior to the fix for 4956777), |
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342 // the "next" field is used to chain the pending list, not the discovered |
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343 // field. |
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344 |
0 | 345 if (TraceReferenceGC && PrintGCDetails) { |
346 gclog_or_tty->print_cr("ReferenceProcessor::enqueue_discovered_reflist list " | |
347 INTPTR_FORMAT, (address)refs_list.head()); | |
348 } | |
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349 |
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350 oop obj = NULL; |
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351 oop next_d = refs_list.head(); |
14309 | 352 if (pending_list_uses_discovered_field()) { // New behavior |
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353 // Walk down the list, self-looping the next field |
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354 // so that the References are not considered active. |
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355 while (obj != next_d) { |
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356 obj = next_d; |
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357 assert(obj->is_instanceRef(), "should be reference object"); |
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358 next_d = java_lang_ref_Reference::discovered(obj); |
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359 if (TraceReferenceGC && PrintGCDetails) { |
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360 gclog_or_tty->print_cr(" obj " INTPTR_FORMAT "/next_d " INTPTR_FORMAT, |
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361 (void *)obj, (void *)next_d); |
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362 } |
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363 assert(java_lang_ref_Reference::next(obj) == NULL, |
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364 "Reference not active; should not be discovered"); |
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365 // Self-loop next, so as to make Ref not active. |
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366 // Post-barrier not needed when looping to self. |
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367 java_lang_ref_Reference::set_next_raw(obj, obj); |
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368 if (next_d == obj) { // obj is last |
14309 | 369 // Swap refs_list into pending_list_addr and |
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370 // set obj's discovered to what we read from pending_list_addr. |
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371 oop old = oopDesc::atomic_exchange_oop(refs_list.head(), pending_list_addr); |
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372 // Need post-barrier on pending_list_addr above; |
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373 // see special post-barrier code at the end of |
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374 // enqueue_discovered_reflists() further below. |
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375 java_lang_ref_Reference::set_discovered_raw(obj, old); // old may be NULL |
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376 oopDesc::bs()->write_ref_field(java_lang_ref_Reference::discovered_addr(obj), old); |
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377 } |
0 | 378 } |
14309 | 379 } else { // Old behavior |
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380 // Walk down the list, copying the discovered field into |
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381 // the next field and clearing the discovered field. |
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382 while (obj != next_d) { |
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383 obj = next_d; |
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384 assert(obj->is_instanceRef(), "should be reference object"); |
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385 next_d = java_lang_ref_Reference::discovered(obj); |
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386 if (TraceReferenceGC && PrintGCDetails) { |
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387 gclog_or_tty->print_cr(" obj " INTPTR_FORMAT "/next_d " INTPTR_FORMAT, |
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388 (void *)obj, (void *)next_d); |
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389 } |
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390 assert(java_lang_ref_Reference::next(obj) == NULL, |
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391 "The reference should not be enqueued"); |
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392 if (next_d == obj) { // obj is last |
14309 | 393 // Swap refs_list into pending_list_addr and |
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394 // set obj's next to what we read from pending_list_addr. |
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395 oop old = oopDesc::atomic_exchange_oop(refs_list.head(), pending_list_addr); |
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396 // Need oop_check on pending_list_addr above; |
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397 // see special oop-check code at the end of |
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398 // enqueue_discovered_reflists() further below. |
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399 if (old == NULL) { |
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400 // obj should be made to point to itself, since |
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401 // pending list was empty. |
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402 java_lang_ref_Reference::set_next(obj, obj); |
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403 } else { |
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404 java_lang_ref_Reference::set_next(obj, old); |
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405 } |
0 | 406 } else { |
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407 java_lang_ref_Reference::set_next(obj, next_d); |
0 | 408 } |
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409 java_lang_ref_Reference::set_discovered(obj, (oop) NULL); |
0 | 410 } |
411 } | |
412 } | |
413 | |
414 // Parallel enqueue task | |
415 class RefProcEnqueueTask: public AbstractRefProcTaskExecutor::EnqueueTask { | |
416 public: | |
417 RefProcEnqueueTask(ReferenceProcessor& ref_processor, | |
418 DiscoveredList discovered_refs[], | |
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419 HeapWord* pending_list_addr, |
0 | 420 int n_queues) |
421 : EnqueueTask(ref_processor, discovered_refs, | |
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422 pending_list_addr, n_queues) |
0 | 423 { } |
424 | |
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425 virtual void work(unsigned int work_id) { |
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426 assert(work_id < (unsigned int)_ref_processor.max_num_q(), "Index out-of-bounds"); |
0 | 427 // Simplest first cut: static partitioning. |
428 int index = work_id; | |
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429 // The increment on "index" must correspond to the maximum number of queues |
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430 // (n_queues) with which that ReferenceProcessor was created. That |
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431 // is because of the "clever" way the discovered references lists were |
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432 // allocated and are indexed into. |
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433 assert(_n_queues == (int) _ref_processor.max_num_q(), "Different number not expected"); |
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434 for (int j = 0; |
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435 j < ReferenceProcessor::number_of_subclasses_of_ref(); |
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436 j++, index += _n_queues) { |
0 | 437 _ref_processor.enqueue_discovered_reflist( |
438 _refs_lists[index], _pending_list_addr); | |
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439 _refs_lists[index].set_head(NULL); |
0 | 440 _refs_lists[index].set_length(0); |
441 } | |
442 } | |
443 }; | |
444 | |
445 // Enqueue references that are not made active again | |
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446 void ReferenceProcessor::enqueue_discovered_reflists(HeapWord* pending_list_addr, |
0 | 447 AbstractRefProcTaskExecutor* task_executor) { |
448 if (_processing_is_mt && task_executor != NULL) { | |
449 // Parallel code | |
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450 RefProcEnqueueTask tsk(*this, _discovered_refs, |
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451 pending_list_addr, _max_num_q); |
0 | 452 task_executor->execute(tsk); |
453 } else { | |
454 // Serial code: call the parent class's implementation | |
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455 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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456 enqueue_discovered_reflist(_discovered_refs[i], pending_list_addr); |
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457 _discovered_refs[i].set_head(NULL); |
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458 _discovered_refs[i].set_length(0); |
0 | 459 } |
460 } | |
461 } | |
462 | |
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463 void DiscoveredListIterator::load_ptrs(DEBUG_ONLY(bool allow_null_referent)) { |
0 | 464 _discovered_addr = java_lang_ref_Reference::discovered_addr(_ref); |
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465 oop discovered = java_lang_ref_Reference::discovered(_ref); |
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466 assert(_discovered_addr && discovered->is_oop_or_null(), |
0 | 467 "discovered field is bad"); |
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468 _next = discovered; |
0 | 469 _referent_addr = java_lang_ref_Reference::referent_addr(_ref); |
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470 _referent = java_lang_ref_Reference::referent(_ref); |
0 | 471 assert(Universe::heap()->is_in_reserved_or_null(_referent), |
472 "Wrong oop found in java.lang.Reference object"); | |
473 assert(allow_null_referent ? | |
474 _referent->is_oop_or_null() | |
475 : _referent->is_oop(), | |
476 "bad referent"); | |
477 } | |
478 | |
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479 void DiscoveredListIterator::remove() { |
0 | 480 assert(_ref->is_oop(), "Dropping a bad reference"); |
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481 oop_store_raw(_discovered_addr, NULL); |
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482 |
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483 // First _prev_next ref actually points into DiscoveredList (gross). |
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484 oop new_next; |
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485 if (_next == _ref) { |
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486 // At the end of the list, we should make _prev point to itself. |
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487 // If _ref is the first ref, then _prev_next will be in the DiscoveredList, |
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488 // and _prev will be NULL. |
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489 new_next = _prev; |
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490 } else { |
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491 new_next = _next; |
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492 } |
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493 // Remove Reference object from discovered list. Note that G1 does not need a |
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494 // pre-barrier here because we know the Reference has already been found/marked, |
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495 // that's how it ended up in the discovered list in the first place. |
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496 oop_store_raw(_prev_next, new_next); |
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497 if (_discovered_list_needs_post_barrier && _prev_next != _refs_list.adr_head()) { |
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498 // Needs post-barrier and this is not the list head (which is not on the heap) |
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499 oopDesc::bs()->write_ref_field(_prev_next, new_next); |
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500 } |
0 | 501 NOT_PRODUCT(_removed++); |
452
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502 _refs_list.dec_length(1); |
0 | 503 } |
504 | |
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505 // Make the Reference object active again. |
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506 void DiscoveredListIterator::make_active() { |
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507 // For G1 we don't want to use set_next - it |
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508 // will dirty the card for the next field of |
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509 // the reference object and will fail |
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510 // CT verification. |
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511 if (UseG1GC) { |
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512 HeapWord* next_addr = java_lang_ref_Reference::next_addr(_ref); |
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513 if (UseCompressedOops) { |
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514 oopDesc::bs()->write_ref_field_pre((narrowOop*)next_addr, NULL); |
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515 } else { |
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516 oopDesc::bs()->write_ref_field_pre((oop*)next_addr, NULL); |
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517 } |
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518 java_lang_ref_Reference::set_next_raw(_ref, NULL); |
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519 } else { |
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520 java_lang_ref_Reference::set_next(_ref, NULL); |
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521 } |
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522 } |
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523 |
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524 void DiscoveredListIterator::clear_referent() { |
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525 oop_store_raw(_referent_addr, NULL); |
0 | 526 } |
527 | |
528 // NOTE: process_phase*() are largely similar, and at a high level | |
529 // merely iterate over the extant list applying a predicate to | |
530 // each of its elements and possibly removing that element from the | |
531 // list and applying some further closures to that element. | |
532 // We should consider the possibility of replacing these | |
533 // process_phase*() methods by abstracting them into | |
534 // a single general iterator invocation that receives appropriate | |
535 // closures that accomplish this work. | |
536 | |
537 // (SoftReferences only) Traverse the list and remove any SoftReferences whose | |
538 // referents are not alive, but that should be kept alive for policy reasons. | |
539 // Keep alive the transitive closure of all such referents. | |
540 void | |
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541 ReferenceProcessor::process_phase1(DiscoveredList& refs_list, |
0 | 542 ReferencePolicy* policy, |
543 BoolObjectClosure* is_alive, | |
544 OopClosure* keep_alive, | |
545 VoidClosure* complete_gc) { | |
546 assert(policy != NULL, "Must have a non-NULL policy"); | |
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547 DiscoveredListIterator iter(refs_list, keep_alive, is_alive, _discovered_list_needs_post_barrier); |
0 | 548 // Decide which softly reachable refs should be kept alive. |
549 while (iter.has_next()) { | |
550 iter.load_ptrs(DEBUG_ONLY(!discovery_is_atomic() /* allow_null_referent */)); | |
551 bool referent_is_dead = (iter.referent() != NULL) && !iter.is_referent_alive(); | |
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552 if (referent_is_dead && |
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553 !policy->should_clear_reference(iter.obj(), _soft_ref_timestamp_clock)) { |
0 | 554 if (TraceReferenceGC) { |
555 gclog_or_tty->print_cr("Dropping reference (" INTPTR_FORMAT ": %s" ") by policy", | |
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556 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 557 } |
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558 // Remove Reference object from list |
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559 iter.remove(); |
0 | 560 // Make the Reference object active again |
561 iter.make_active(); | |
562 // keep the referent around | |
563 iter.make_referent_alive(); | |
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564 iter.move_to_next(); |
0 | 565 } else { |
566 iter.next(); | |
567 } | |
568 } | |
569 // Close the reachable set | |
570 complete_gc->do_void(); | |
571 NOT_PRODUCT( | |
572 if (PrintGCDetails && TraceReferenceGC) { | |
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573 gclog_or_tty->print_cr(" Dropped %d dead Refs out of %d " |
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574 "discovered Refs by policy, from list " INTPTR_FORMAT, |
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575 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 576 } |
577 ) | |
578 } | |
579 | |
580 // Traverse the list and remove any Refs that are not active, or | |
581 // whose referents are either alive or NULL. | |
582 void | |
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583 ReferenceProcessor::pp2_work(DiscoveredList& refs_list, |
0 | 584 BoolObjectClosure* is_alive, |
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585 OopClosure* keep_alive) { |
0 | 586 assert(discovery_is_atomic(), "Error"); |
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587 DiscoveredListIterator iter(refs_list, keep_alive, is_alive, _discovered_list_needs_post_barrier); |
0 | 588 while (iter.has_next()) { |
589 iter.load_ptrs(DEBUG_ONLY(false /* allow_null_referent */)); | |
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590 DEBUG_ONLY(oop next = java_lang_ref_Reference::next(iter.obj());) |
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591 assert(next == NULL, "Should not discover inactive Reference"); |
0 | 592 if (iter.is_referent_alive()) { |
593 if (TraceReferenceGC) { | |
594 gclog_or_tty->print_cr("Dropping strongly reachable reference (" INTPTR_FORMAT ": %s)", | |
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595 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 596 } |
597 // The referent is reachable after all. | |
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598 // Remove Reference object from list. |
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599 iter.remove(); |
0 | 600 // Update the referent pointer as necessary: Note that this |
601 // should not entail any recursive marking because the | |
602 // referent must already have been traversed. | |
603 iter.make_referent_alive(); | |
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604 iter.move_to_next(); |
0 | 605 } else { |
606 iter.next(); | |
607 } | |
608 } | |
609 NOT_PRODUCT( | |
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610 if (PrintGCDetails && TraceReferenceGC && (iter.processed() > 0)) { |
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611 gclog_or_tty->print_cr(" Dropped %d active Refs out of %d " |
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612 "Refs in discovered list " INTPTR_FORMAT, |
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613 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 614 } |
615 ) | |
616 } | |
617 | |
618 void | |
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619 ReferenceProcessor::pp2_work_concurrent_discovery(DiscoveredList& refs_list, |
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620 BoolObjectClosure* is_alive, |
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621 OopClosure* keep_alive, |
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622 VoidClosure* complete_gc) { |
0 | 623 assert(!discovery_is_atomic(), "Error"); |
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624 DiscoveredListIterator iter(refs_list, keep_alive, is_alive, _discovered_list_needs_post_barrier); |
0 | 625 while (iter.has_next()) { |
626 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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627 HeapWord* next_addr = java_lang_ref_Reference::next_addr(iter.obj()); |
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628 oop next = java_lang_ref_Reference::next(iter.obj()); |
0 | 629 if ((iter.referent() == NULL || iter.is_referent_alive() || |
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630 next != NULL)) { |
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631 assert(next->is_oop_or_null(), "bad next field"); |
0 | 632 // Remove Reference object from list |
633 iter.remove(); | |
634 // Trace the cohorts | |
635 iter.make_referent_alive(); | |
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636 if (UseCompressedOops) { |
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637 keep_alive->do_oop((narrowOop*)next_addr); |
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638 } else { |
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639 keep_alive->do_oop((oop*)next_addr); |
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640 } |
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641 iter.move_to_next(); |
0 | 642 } else { |
643 iter.next(); | |
644 } | |
645 } | |
646 // Now close the newly reachable set | |
647 complete_gc->do_void(); | |
648 NOT_PRODUCT( | |
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649 if (PrintGCDetails && TraceReferenceGC && (iter.processed() > 0)) { |
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650 gclog_or_tty->print_cr(" Dropped %d active Refs out of %d " |
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651 "Refs in discovered list " INTPTR_FORMAT, |
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652 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 653 } |
654 ) | |
655 } | |
656 | |
657 // Traverse the list and process the referents, by either | |
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658 // clearing them or keeping them (and their reachable |
0 | 659 // closure) alive. |
660 void | |
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661 ReferenceProcessor::process_phase3(DiscoveredList& refs_list, |
0 | 662 bool clear_referent, |
663 BoolObjectClosure* is_alive, | |
664 OopClosure* keep_alive, | |
665 VoidClosure* complete_gc) { | |
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666 ResourceMark rm; |
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667 DiscoveredListIterator iter(refs_list, keep_alive, is_alive, _discovered_list_needs_post_barrier); |
0 | 668 while (iter.has_next()) { |
669 iter.update_discovered(); | |
670 iter.load_ptrs(DEBUG_ONLY(false /* allow_null_referent */)); | |
671 if (clear_referent) { | |
672 // NULL out referent pointer | |
673 iter.clear_referent(); | |
674 } else { | |
675 // keep the referent around | |
676 iter.make_referent_alive(); | |
677 } | |
678 if (TraceReferenceGC) { | |
679 gclog_or_tty->print_cr("Adding %sreference (" INTPTR_FORMAT ": %s) as pending", | |
680 clear_referent ? "cleared " : "", | |
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681 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 682 } |
683 assert(iter.obj()->is_oop(UseConcMarkSweepGC), "Adding a bad reference"); | |
684 iter.next(); | |
685 } | |
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686 // Remember to update the next pointer of the last ref. |
0 | 687 iter.update_discovered(); |
688 // Close the reachable set | |
689 complete_gc->do_void(); | |
690 } | |
691 | |
692 void | |
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693 ReferenceProcessor::clear_discovered_references(DiscoveredList& refs_list) { |
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694 oop obj = NULL; |
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695 oop next = refs_list.head(); |
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696 while (next != obj) { |
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697 obj = next; |
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698 next = java_lang_ref_Reference::discovered(obj); |
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699 java_lang_ref_Reference::set_discovered_raw(obj, NULL); |
0 | 700 } |
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701 refs_list.set_head(NULL); |
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702 refs_list.set_length(0); |
0 | 703 } |
704 | |
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705 void |
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706 ReferenceProcessor::abandon_partial_discovered_list(DiscoveredList& refs_list) { |
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707 clear_discovered_references(refs_list); |
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708 } |
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709 |
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710 void ReferenceProcessor::abandon_partial_discovery() { |
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711 // loop over the lists |
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712 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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713 if (TraceReferenceGC && PrintGCDetails && ((i % _max_num_q) == 0)) { |
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714 gclog_or_tty->print_cr("\nAbandoning %s discovered list", list_name(i)); |
342
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715 } |
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716 abandon_partial_discovered_list(_discovered_refs[i]); |
0 | 717 } |
718 } | |
719 | |
720 class RefProcPhase1Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
721 public: | |
722 RefProcPhase1Task(ReferenceProcessor& ref_processor, | |
723 DiscoveredList refs_lists[], | |
724 ReferencePolicy* policy, | |
725 bool marks_oops_alive) | |
726 : ProcessTask(ref_processor, refs_lists, marks_oops_alive), | |
727 _policy(policy) | |
728 { } | |
729 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
730 OopClosure& keep_alive, | |
731 VoidClosure& complete_gc) | |
732 { | |
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733 Thread* thr = Thread::current(); |
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734 int refs_list_index = ((WorkerThread*)thr)->id(); |
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735 _ref_processor.process_phase1(_refs_lists[refs_list_index], _policy, |
0 | 736 &is_alive, &keep_alive, &complete_gc); |
737 } | |
738 private: | |
739 ReferencePolicy* _policy; | |
740 }; | |
741 | |
742 class RefProcPhase2Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
743 public: | |
744 RefProcPhase2Task(ReferenceProcessor& ref_processor, | |
745 DiscoveredList refs_lists[], | |
746 bool marks_oops_alive) | |
747 : ProcessTask(ref_processor, refs_lists, marks_oops_alive) | |
748 { } | |
749 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
750 OopClosure& keep_alive, | |
751 VoidClosure& complete_gc) | |
752 { | |
753 _ref_processor.process_phase2(_refs_lists[i], | |
754 &is_alive, &keep_alive, &complete_gc); | |
755 } | |
756 }; | |
757 | |
758 class RefProcPhase3Task: public AbstractRefProcTaskExecutor::ProcessTask { | |
759 public: | |
760 RefProcPhase3Task(ReferenceProcessor& ref_processor, | |
761 DiscoveredList refs_lists[], | |
762 bool clear_referent, | |
763 bool marks_oops_alive) | |
764 : ProcessTask(ref_processor, refs_lists, marks_oops_alive), | |
765 _clear_referent(clear_referent) | |
766 { } | |
767 virtual void work(unsigned int i, BoolObjectClosure& is_alive, | |
768 OopClosure& keep_alive, | |
769 VoidClosure& complete_gc) | |
770 { | |
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771 // Don't use "refs_list_index" calculated in this way because |
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772 // balance_queues() has moved the Ref's into the first n queues. |
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773 // Thread* thr = Thread::current(); |
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774 // int refs_list_index = ((WorkerThread*)thr)->id(); |
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775 // _ref_processor.process_phase3(_refs_lists[refs_list_index], _clear_referent, |
0 | 776 _ref_processor.process_phase3(_refs_lists[i], _clear_referent, |
777 &is_alive, &keep_alive, &complete_gc); | |
778 } | |
779 private: | |
780 bool _clear_referent; | |
781 }; | |
782 | |
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783 void ReferenceProcessor::set_discovered(oop ref, oop value) { |
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784 java_lang_ref_Reference::set_discovered_raw(ref, value); |
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785 if (_discovered_list_needs_post_barrier) { |
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786 oopDesc::bs()->write_ref_field(java_lang_ref_Reference::discovered_addr(ref), value); |
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787 } |
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788 } |
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789 |
0 | 790 // Balances reference queues. |
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791 // Move entries from all queues[0, 1, ..., _max_num_q-1] to |
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792 // queues[0, 1, ..., _num_q-1] because only the first _num_q |
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793 // corresponding to the active workers will be processed. |
0 | 794 void ReferenceProcessor::balance_queues(DiscoveredList ref_lists[]) |
795 { | |
796 // calculate total length | |
797 size_t total_refs = 0; | |
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798 if (TraceReferenceGC && PrintGCDetails) { |
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799 gclog_or_tty->print_cr("\nBalance ref_lists "); |
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800 } |
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801 |
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802 for (uint i = 0; i < _max_num_q; ++i) { |
0 | 803 total_refs += ref_lists[i].length(); |
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804 if (TraceReferenceGC && PrintGCDetails) { |
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805 gclog_or_tty->print("%d ", ref_lists[i].length()); |
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806 } |
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807 } |
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808 if (TraceReferenceGC && PrintGCDetails) { |
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809 gclog_or_tty->print_cr(" = %d", total_refs); |
0 | 810 } |
811 size_t avg_refs = total_refs / _num_q + 1; | |
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812 uint to_idx = 0; |
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813 for (uint from_idx = 0; from_idx < _max_num_q; from_idx++) { |
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814 bool move_all = false; |
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815 if (from_idx >= _num_q) { |
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816 move_all = ref_lists[from_idx].length() > 0; |
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817 } |
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818 while ((ref_lists[from_idx].length() > avg_refs) || |
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819 move_all) { |
0 | 820 assert(to_idx < _num_q, "Sanity Check!"); |
821 if (ref_lists[to_idx].length() < avg_refs) { | |
822 // move superfluous refs | |
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823 size_t refs_to_move; |
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824 // Move all the Ref's if the from queue will not be processed. |
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825 if (move_all) { |
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826 refs_to_move = MIN2(ref_lists[from_idx].length(), |
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827 avg_refs - ref_lists[to_idx].length()); |
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828 } else { |
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829 refs_to_move = MIN2(ref_lists[from_idx].length() - avg_refs, |
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830 avg_refs - ref_lists[to_idx].length()); |
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831 } |
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832 |
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833 assert(refs_to_move > 0, "otherwise the code below will fail"); |
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834 |
0 | 835 oop move_head = ref_lists[from_idx].head(); |
836 oop move_tail = move_head; | |
837 oop new_head = move_head; | |
838 // find an element to split the list on | |
839 for (size_t j = 0; j < refs_to_move; ++j) { | |
840 move_tail = new_head; | |
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841 new_head = java_lang_ref_Reference::discovered(new_head); |
0 | 842 } |
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843 |
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844 // Add the chain to the to list. |
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845 if (ref_lists[to_idx].head() == NULL) { |
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846 // to list is empty. Make a loop at the end. |
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847 set_discovered(move_tail, move_tail); |
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848 } else { |
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849 set_discovered(move_tail, ref_lists[to_idx].head()); |
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850 } |
0 | 851 ref_lists[to_idx].set_head(move_head); |
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852 ref_lists[to_idx].inc_length(refs_to_move); |
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853 |
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854 // Remove the chain from the from list. |
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855 if (move_tail == new_head) { |
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856 // We found the end of the from list. |
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857 ref_lists[from_idx].set_head(NULL); |
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858 } else { |
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859 ref_lists[from_idx].set_head(new_head); |
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860 } |
452
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861 ref_lists[from_idx].dec_length(refs_to_move); |
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862 if (ref_lists[from_idx].length() == 0) { |
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863 break; |
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864 } |
0 | 865 } else { |
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866 to_idx = (to_idx + 1) % _num_q; |
0 | 867 } |
868 } | |
869 } | |
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870 #ifdef ASSERT |
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871 size_t balanced_total_refs = 0; |
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872 for (uint i = 0; i < _max_num_q; ++i) { |
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873 balanced_total_refs += ref_lists[i].length(); |
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874 if (TraceReferenceGC && PrintGCDetails) { |
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875 gclog_or_tty->print("%d ", ref_lists[i].length()); |
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876 } |
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877 } |
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878 if (TraceReferenceGC && PrintGCDetails) { |
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879 gclog_or_tty->print_cr(" = %d", balanced_total_refs); |
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880 gclog_or_tty->flush(); |
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881 } |
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882 assert(total_refs == balanced_total_refs, "Balancing was incomplete"); |
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883 #endif |
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884 } |
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885 |
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886 void ReferenceProcessor::balance_all_queues() { |
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887 balance_queues(_discoveredSoftRefs); |
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888 balance_queues(_discoveredWeakRefs); |
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889 balance_queues(_discoveredFinalRefs); |
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890 balance_queues(_discoveredPhantomRefs); |
0 | 891 } |
892 | |
10405 | 893 size_t |
0 | 894 ReferenceProcessor::process_discovered_reflist( |
895 DiscoveredList refs_lists[], | |
896 ReferencePolicy* policy, | |
897 bool clear_referent, | |
898 BoolObjectClosure* is_alive, | |
899 OopClosure* keep_alive, | |
900 VoidClosure* complete_gc, | |
901 AbstractRefProcTaskExecutor* task_executor) | |
902 { | |
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903 bool mt_processing = task_executor != NULL && _processing_is_mt; |
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904 // If discovery used MT and a dynamic number of GC threads, then |
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905 // the queues must be balanced for correctness if fewer than the |
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906 // maximum number of queues were used. The number of queue used |
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907 // during discovery may be different than the number to be used |
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908 // for processing so don't depend of _num_q < _max_num_q as part |
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909 // of the test. |
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910 bool must_balance = _discovery_is_mt; |
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911 |
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912 if ((mt_processing && ParallelRefProcBalancingEnabled) || |
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913 must_balance) { |
0 | 914 balance_queues(refs_lists); |
915 } | |
10405 | 916 |
917 size_t total_list_count = total_count(refs_lists); | |
918 | |
0 | 919 if (PrintReferenceGC && PrintGCDetails) { |
10405 | 920 gclog_or_tty->print(", %u refs", total_list_count); |
0 | 921 } |
922 | |
923 // Phase 1 (soft refs only): | |
924 // . Traverse the list and remove any SoftReferences whose | |
925 // referents are not alive, but that should be kept alive for | |
926 // policy reasons. Keep alive the transitive closure of all | |
927 // such referents. | |
928 if (policy != NULL) { | |
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929 if (mt_processing) { |
0 | 930 RefProcPhase1Task phase1(*this, refs_lists, policy, true /*marks_oops_alive*/); |
931 task_executor->execute(phase1); | |
932 } else { | |
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933 for (uint i = 0; i < _max_num_q; i++) { |
0 | 934 process_phase1(refs_lists[i], policy, |
935 is_alive, keep_alive, complete_gc); | |
936 } | |
937 } | |
938 } else { // policy == NULL | |
939 assert(refs_lists != _discoveredSoftRefs, | |
940 "Policy must be specified for soft references."); | |
941 } | |
942 | |
943 // Phase 2: | |
944 // . Traverse the list and remove any refs whose referents are alive. | |
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945 if (mt_processing) { |
0 | 946 RefProcPhase2Task phase2(*this, refs_lists, !discovery_is_atomic() /*marks_oops_alive*/); |
947 task_executor->execute(phase2); | |
948 } else { | |
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949 for (uint i = 0; i < _max_num_q; i++) { |
0 | 950 process_phase2(refs_lists[i], is_alive, keep_alive, complete_gc); |
951 } | |
952 } | |
953 | |
954 // Phase 3: | |
955 // . Traverse the list and process referents as appropriate. | |
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956 if (mt_processing) { |
0 | 957 RefProcPhase3Task phase3(*this, refs_lists, clear_referent, true /*marks_oops_alive*/); |
958 task_executor->execute(phase3); | |
959 } else { | |
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960 for (uint i = 0; i < _max_num_q; i++) { |
0 | 961 process_phase3(refs_lists[i], clear_referent, |
962 is_alive, keep_alive, complete_gc); | |
963 } | |
964 } | |
10405 | 965 |
966 return total_list_count; | |
0 | 967 } |
968 | |
969 void ReferenceProcessor::clean_up_discovered_references() { | |
970 // loop over the lists | |
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971 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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972 if (TraceReferenceGC && PrintGCDetails && ((i % _max_num_q) == 0)) { |
0 | 973 gclog_or_tty->print_cr( |
974 "\nScrubbing %s discovered list of Null referents", | |
975 list_name(i)); | |
976 } | |
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977 clean_up_discovered_reflist(_discovered_refs[i]); |
0 | 978 } |
979 } | |
980 | |
981 void ReferenceProcessor::clean_up_discovered_reflist(DiscoveredList& refs_list) { | |
982 assert(!discovery_is_atomic(), "Else why call this method?"); | |
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983 DiscoveredListIterator iter(refs_list, NULL, NULL, _discovered_list_needs_post_barrier); |
0 | 984 while (iter.has_next()) { |
985 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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986 oop next = java_lang_ref_Reference::next(iter.obj()); |
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987 assert(next->is_oop_or_null(), "bad next field"); |
0 | 988 // If referent has been cleared or Reference is not active, |
989 // drop it. | |
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990 if (iter.referent() == NULL || next != NULL) { |
0 | 991 debug_only( |
992 if (PrintGCDetails && TraceReferenceGC) { | |
993 gclog_or_tty->print_cr("clean_up_discovered_list: Dropping Reference: " | |
994 INTPTR_FORMAT " with next field: " INTPTR_FORMAT | |
995 " and referent: " INTPTR_FORMAT, | |
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996 (void *)iter.obj(), (void *)next, (void *)iter.referent()); |
0 | 997 } |
998 ) | |
999 // Remove Reference object from list | |
1000 iter.remove(); | |
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1001 iter.move_to_next(); |
0 | 1002 } else { |
1003 iter.next(); | |
1004 } | |
1005 } | |
1006 NOT_PRODUCT( | |
1007 if (PrintGCDetails && TraceReferenceGC) { | |
1008 gclog_or_tty->print( | |
1009 " Removed %d Refs with NULL referents out of %d discovered Refs", | |
1010 iter.removed(), iter.processed()); | |
1011 } | |
1012 ) | |
1013 } | |
1014 | |
1015 inline DiscoveredList* ReferenceProcessor::get_discovered_list(ReferenceType rt) { | |
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1016 uint id = 0; |
0 | 1017 // Determine the queue index to use for this object. |
1018 if (_discovery_is_mt) { | |
1019 // During a multi-threaded discovery phase, | |
1020 // each thread saves to its "own" list. | |
1021 Thread* thr = Thread::current(); | |
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1022 id = thr->as_Worker_thread()->id(); |
0 | 1023 } else { |
1024 // single-threaded discovery, we save in round-robin | |
1025 // fashion to each of the lists. | |
1026 if (_processing_is_mt) { | |
1027 id = next_id(); | |
1028 } | |
1029 } | |
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1030 assert(0 <= id && id < _max_num_q, "Id is out-of-bounds (call Freud?)"); |
0 | 1031 |
1032 // Get the discovered queue to which we will add | |
1033 DiscoveredList* list = NULL; | |
1034 switch (rt) { | |
1035 case REF_OTHER: | |
1036 // Unknown reference type, no special treatment | |
1037 break; | |
1038 case REF_SOFT: | |
1039 list = &_discoveredSoftRefs[id]; | |
1040 break; | |
1041 case REF_WEAK: | |
1042 list = &_discoveredWeakRefs[id]; | |
1043 break; | |
1044 case REF_FINAL: | |
1045 list = &_discoveredFinalRefs[id]; | |
1046 break; | |
1047 case REF_PHANTOM: | |
1048 list = &_discoveredPhantomRefs[id]; | |
1049 break; | |
1050 case REF_NONE: | |
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1051 // we should not reach here if we are an InstanceRefKlass |
0 | 1052 default: |
1053 ShouldNotReachHere(); | |
1054 } | |
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1055 if (TraceReferenceGC && PrintGCDetails) { |
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1056 gclog_or_tty->print_cr("Thread %d gets list " INTPTR_FORMAT, id, list); |
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1057 } |
0 | 1058 return list; |
1059 } | |
1060 | |
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1061 inline void |
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1062 ReferenceProcessor::add_to_discovered_list_mt(DiscoveredList& refs_list, |
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1063 oop obj, |
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1064 HeapWord* discovered_addr) { |
0 | 1065 assert(_discovery_is_mt, "!_discovery_is_mt should have been handled by caller"); |
1066 // First we must make sure this object is only enqueued once. CAS in a non null | |
1067 // discovered_addr. | |
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1068 oop current_head = refs_list.head(); |
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1069 // The last ref must have its discovered field pointing to itself. |
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1070 oop next_discovered = (current_head != NULL) ? current_head : obj; |
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1071 |
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1072 // Note: In the case of G1, this specific pre-barrier is strictly |
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1073 // not necessary because the only case we are interested in |
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1074 // here is when *discovered_addr is NULL (see the CAS further below), |
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1075 // so this will expand to nothing. As a result, we have manually |
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1076 // elided this out for G1, but left in the test for some future |
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1077 // collector that might have need for a pre-barrier here, e.g.:- |
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1078 // oopDesc::bs()->write_ref_field_pre((oop* or narrowOop*)discovered_addr, next_discovered); |
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1079 assert(!_discovered_list_needs_post_barrier || UseG1GC, |
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1080 "Need to check non-G1 collector: " |
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1081 "may need a pre-write-barrier for CAS from NULL below"); |
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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 if (_discovered_list_needs_post_barrier) { |
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1091 oopDesc::bs()->write_ref_field((void*)discovered_addr, next_discovered); |
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1092 } |
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1093 |
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1094 if (TraceReferenceGC) { |
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1095 gclog_or_tty->print_cr("Discovered reference (mt) (" INTPTR_FORMAT ": %s)", |
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1096 (void *)obj, obj->klass()->internal_name()); |
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1097 } |
0 | 1098 } else { |
1099 // If retest was non NULL, another thread beat us to it: | |
1100 // The reference has already been discovered... | |
1101 if (TraceReferenceGC) { | |
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1102 gclog_or_tty->print_cr("Already discovered reference (" INTPTR_FORMAT ": %s)", |
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1103 (void *)obj, obj->klass()->internal_name()); |
0 | 1104 } |
1105 } | |
1106 } | |
1107 | |
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1108 #ifndef PRODUCT |
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1109 // Non-atomic (i.e. concurrent) discovery might allow us |
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1110 // to observe j.l.References with NULL referents, being those |
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1111 // cleared concurrently by mutators during (or after) discovery. |
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1112 void ReferenceProcessor::verify_referent(oop obj) { |
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1113 bool da = discovery_is_atomic(); |
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1114 oop referent = java_lang_ref_Reference::referent(obj); |
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1115 assert(da ? referent->is_oop() : referent->is_oop_or_null(), |
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1116 err_msg("Bad referent " INTPTR_FORMAT " found in Reference " |
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1117 INTPTR_FORMAT " during %satomic discovery ", |
12316
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1118 (void *)referent, (void *)obj, da ? "" : "non-")); |
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1119 } |
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1120 #endif |
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1121 |
0 | 1122 // We mention two of several possible choices here: |
1123 // #0: if the reference object is not in the "originating generation" | |
1124 // (or part of the heap being collected, indicated by our "span" | |
1125 // we don't treat it specially (i.e. we scan it as we would | |
1126 // a normal oop, treating its references as strong references). | |
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1127 // This means that references can't be discovered unless their |
0 | 1128 // referent is also in the same span. This is the simplest, |
1129 // most "local" and most conservative approach, albeit one | |
1130 // that may cause weak references to be enqueued least promptly. | |
1131 // We call this choice the "ReferenceBasedDiscovery" policy. | |
1132 // #1: the reference object may be in any generation (span), but if | |
1133 // the referent is in the generation (span) being currently collected | |
1134 // then we can discover the reference object, provided | |
1135 // the object has not already been discovered by | |
1136 // a different concurrently running collector (as may be the | |
1137 // case, for instance, if the reference object is in CMS and | |
1138 // the referent in DefNewGeneration), and provided the processing | |
1139 // of this reference object by the current collector will | |
1140 // appear atomic to every other collector in the system. | |
1141 // (Thus, for instance, a concurrent collector may not | |
1142 // discover references in other generations even if the | |
1143 // referent is in its own generation). This policy may, | |
1144 // in certain cases, enqueue references somewhat sooner than | |
1145 // might Policy #0 above, but at marginally increased cost | |
1146 // and complexity in processing these references. | |
1147 // We call this choice the "RefeferentBasedDiscovery" policy. | |
1148 bool ReferenceProcessor::discover_reference(oop obj, ReferenceType rt) { | |
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1149 // Make sure we are discovering refs (rather than processing discovered refs). |
0 | 1150 if (!_discovering_refs || !RegisterReferences) { |
1151 return false; | |
1152 } | |
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1153 // We only discover active references. |
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1154 oop next = java_lang_ref_Reference::next(obj); |
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1155 if (next != NULL) { // Ref is no longer active |
0 | 1156 return false; |
1157 } | |
1158 | |
1159 HeapWord* obj_addr = (HeapWord*)obj; | |
1160 if (RefDiscoveryPolicy == ReferenceBasedDiscovery && | |
1161 !_span.contains(obj_addr)) { | |
1162 // Reference is not in the originating generation; | |
1163 // don't treat it specially (i.e. we want to scan it as a normal | |
1164 // object with strong references). | |
1165 return false; | |
1166 } | |
1167 | |
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1168 // We only discover references whose referents are not (yet) |
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1169 // known to be strongly reachable. |
0 | 1170 if (is_alive_non_header() != NULL) { |
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1171 verify_referent(obj); |
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1172 if (is_alive_non_header()->do_object_b(java_lang_ref_Reference::referent(obj))) { |
0 | 1173 return false; // referent is reachable |
1174 } | |
1175 } | |
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1176 if (rt == REF_SOFT) { |
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1177 // For soft refs we can decide now if these are not |
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1178 // current candidates for clearing, in which case we |
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1179 // can mark through them now, rather than delaying that |
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1180 // to the reference-processing phase. Since all current |
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1181 // time-stamp policies advance the soft-ref clock only |
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1182 // at a major collection cycle, this is always currently |
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1183 // accurate. |
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1184 if (!_current_soft_ref_policy->should_clear_reference(obj, _soft_ref_timestamp_clock)) { |
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1185 return false; |
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1186 } |
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1187 } |
0 | 1188 |
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1189 ResourceMark rm; // Needed for tracing. |
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1190 |
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1191 HeapWord* const discovered_addr = java_lang_ref_Reference::discovered_addr(obj); |
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1192 const oop discovered = java_lang_ref_Reference::discovered(obj); |
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1193 assert(discovered->is_oop_or_null(), "bad discovered field"); |
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1194 if (discovered != NULL) { |
0 | 1195 // The reference has already been discovered... |
1196 if (TraceReferenceGC) { | |
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1197 gclog_or_tty->print_cr("Already discovered reference (" INTPTR_FORMAT ": %s)", |
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1198 (void *)obj, obj->klass()->internal_name()); |
0 | 1199 } |
1200 if (RefDiscoveryPolicy == ReferentBasedDiscovery) { | |
1201 // assumes that an object is not processed twice; | |
1202 // if it's been already discovered it must be on another | |
1203 // generation's discovered list; so we won't discover it. | |
1204 return false; | |
1205 } else { | |
1206 assert(RefDiscoveryPolicy == ReferenceBasedDiscovery, | |
1207 "Unrecognized policy"); | |
1208 // Check assumption that an object is not potentially | |
1209 // discovered twice except by concurrent collectors that potentially | |
1210 // trace the same Reference object twice. | |
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1211 assert(UseConcMarkSweepGC || UseG1GC, |
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1212 "Only possible with a concurrent marking collector"); |
0 | 1213 return true; |
1214 } | |
1215 } | |
1216 | |
1217 if (RefDiscoveryPolicy == ReferentBasedDiscovery) { | |
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1218 verify_referent(obj); |
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1219 // Discover if and only if EITHER: |
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1220 // .. reference is in our span, OR |
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1221 // .. we are an atomic collector and referent is in our span |
0 | 1222 if (_span.contains(obj_addr) || |
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1223 (discovery_is_atomic() && |
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1224 _span.contains(java_lang_ref_Reference::referent(obj)))) { |
0 | 1225 // should_enqueue = true; |
1226 } else { | |
1227 return false; | |
1228 } | |
1229 } else { | |
1230 assert(RefDiscoveryPolicy == ReferenceBasedDiscovery && | |
1231 _span.contains(obj_addr), "code inconsistency"); | |
1232 } | |
1233 | |
1234 // Get the right type of discovered queue head. | |
1235 DiscoveredList* list = get_discovered_list(rt); | |
1236 if (list == NULL) { | |
1237 return false; // nothing special needs to be done | |
1238 } | |
1239 | |
1240 if (_discovery_is_mt) { | |
1241 add_to_discovered_list_mt(*list, obj, discovered_addr); | |
1242 } else { | |
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1243 // If "_discovered_list_needs_post_barrier", we do write barriers when |
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1244 // updating the discovered reference list. Otherwise, we do a raw store |
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1245 // here: the field will be visited later when processing the discovered |
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1246 // references. |
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1247 oop current_head = list->head(); |
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1248 // The last ref must have its discovered field pointing to itself. |
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1249 oop next_discovered = (current_head != NULL) ? current_head : obj; |
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1250 |
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1251 // As in the case further above, since we are over-writing a NULL |
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1252 // pre-value, we can safely elide the pre-barrier here for the case of G1. |
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1253 // e.g.:- oopDesc::bs()->write_ref_field_pre((oop* or narrowOop*)discovered_addr, next_discovered); |
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1254 assert(discovered == NULL, "control point invariant"); |
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1255 assert(!_discovered_list_needs_post_barrier || UseG1GC, |
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1256 "For non-G1 collector, may need a pre-write-barrier for CAS from NULL below"); |
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1257 oop_store_raw(discovered_addr, next_discovered); |
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1258 if (_discovered_list_needs_post_barrier) { |
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1259 oopDesc::bs()->write_ref_field((void*)discovered_addr, next_discovered); |
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1260 } |
0 | 1261 list->set_head(obj); |
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1262 list->inc_length(1); |
0 | 1263 |
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1264 if (TraceReferenceGC) { |
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1265 gclog_or_tty->print_cr("Discovered reference (" INTPTR_FORMAT ": %s)", |
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1266 (void *)obj, obj->klass()->internal_name()); |
0 | 1267 } |
1268 } | |
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1269 assert(obj->is_oop(), "Discovered a bad reference"); |
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1270 verify_referent(obj); |
0 | 1271 return true; |
1272 } | |
1273 | |
1274 // Preclean the discovered references by removing those | |
1275 // whose referents are alive, and by marking from those that | |
1276 // are not active. These lists can be handled here | |
1277 // in any order and, indeed, concurrently. | |
1278 void ReferenceProcessor::preclean_discovered_references( | |
1279 BoolObjectClosure* is_alive, | |
1280 OopClosure* keep_alive, | |
1281 VoidClosure* complete_gc, | |
10405 | 1282 YieldClosure* yield, |
1283 GCTimer* gc_timer) { | |
0 | 1284 |
1285 NOT_PRODUCT(verify_ok_to_handle_reflists()); | |
1286 | |
1287 // Soft references | |
1288 { | |
10405 | 1289 GCTraceTime tt("Preclean SoftReferences", PrintGCDetails && PrintReferenceGC, |
1290 false, gc_timer); | |
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1291 for (uint i = 0; i < _max_num_q; i++) { |
452
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1292 if (yield->should_return()) { |
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1293 return; |
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1294 } |
0 | 1295 preclean_discovered_reflist(_discoveredSoftRefs[i], is_alive, |
1296 keep_alive, complete_gc, yield); | |
1297 } | |
1298 } | |
1299 | |
1300 // Weak references | |
1301 { | |
10405 | 1302 GCTraceTime tt("Preclean WeakReferences", PrintGCDetails && PrintReferenceGC, |
1303 false, gc_timer); | |
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1304 for (uint i = 0; i < _max_num_q; i++) { |
452
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1305 if (yield->should_return()) { |
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1306 return; |
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1307 } |
0 | 1308 preclean_discovered_reflist(_discoveredWeakRefs[i], is_alive, |
1309 keep_alive, complete_gc, yield); | |
1310 } | |
1311 } | |
1312 | |
1313 // Final references | |
1314 { | |
10405 | 1315 GCTraceTime tt("Preclean FinalReferences", PrintGCDetails && PrintReferenceGC, |
1316 false, gc_timer); | |
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1317 for (uint i = 0; i < _max_num_q; i++) { |
452
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1318 if (yield->should_return()) { |
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1319 return; |
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1320 } |
0 | 1321 preclean_discovered_reflist(_discoveredFinalRefs[i], is_alive, |
1322 keep_alive, complete_gc, yield); | |
1323 } | |
1324 } | |
1325 | |
1326 // Phantom references | |
1327 { | |
10405 | 1328 GCTraceTime tt("Preclean PhantomReferences", PrintGCDetails && PrintReferenceGC, |
1329 false, gc_timer); | |
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1330 for (uint i = 0; i < _max_num_q; i++) { |
452
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1331 if (yield->should_return()) { |
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1332 return; |
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1333 } |
0 | 1334 preclean_discovered_reflist(_discoveredPhantomRefs[i], is_alive, |
1335 keep_alive, complete_gc, yield); | |
1336 } | |
1337 } | |
1338 } | |
1339 | |
1340 // Walk the given discovered ref list, and remove all reference objects | |
1341 // whose referents are still alive, whose referents are NULL or which | |
452
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1342 // are not active (have a non-NULL next field). NOTE: When we are |
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1343 // thus precleaning the ref lists (which happens single-threaded today), |
14309 | 1344 // we do not disable refs discovery to honor the correct semantics of |
452
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1345 // java.lang.Reference. As a result, we need to be careful below |
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1346 // that ref removal steps interleave safely with ref discovery steps |
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1347 // (in this thread). |
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1348 void |
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1349 ReferenceProcessor::preclean_discovered_reflist(DiscoveredList& refs_list, |
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1350 BoolObjectClosure* is_alive, |
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1351 OopClosure* keep_alive, |
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1352 VoidClosure* complete_gc, |
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1353 YieldClosure* yield) { |
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1354 DiscoveredListIterator iter(refs_list, keep_alive, is_alive, _discovered_list_needs_post_barrier); |
0 | 1355 while (iter.has_next()) { |
1356 iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); | |
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1357 oop obj = iter.obj(); |
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1358 oop next = java_lang_ref_Reference::next(obj); |
0 | 1359 if (iter.referent() == NULL || iter.is_referent_alive() || |
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1360 next != NULL) { |
0 | 1361 // The referent has been cleared, or is alive, or the Reference is not |
1362 // active; we need to trace and mark its cohort. | |
1363 if (TraceReferenceGC) { | |
1364 gclog_or_tty->print_cr("Precleaning Reference (" INTPTR_FORMAT ": %s)", | |
12316
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1365 (void *)iter.obj(), iter.obj()->klass()->internal_name()); |
0 | 1366 } |
1367 // Remove Reference object from list | |
1368 iter.remove(); | |
1369 // Keep alive its cohort. | |
1370 iter.make_referent_alive(); | |
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1371 if (UseCompressedOops) { |
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1372 narrowOop* next_addr = (narrowOop*)java_lang_ref_Reference::next_addr(obj); |
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1373 keep_alive->do_oop(next_addr); |
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1374 } else { |
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1375 oop* next_addr = (oop*)java_lang_ref_Reference::next_addr(obj); |
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1376 keep_alive->do_oop(next_addr); |
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1377 } |
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1378 iter.move_to_next(); |
0 | 1379 } else { |
1380 iter.next(); | |
1381 } | |
1382 } | |
1383 // Close the reachable set | |
1384 complete_gc->do_void(); | |
1385 | |
1386 NOT_PRODUCT( | |
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1387 if (PrintGCDetails && PrintReferenceGC && (iter.processed() > 0)) { |
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1388 gclog_or_tty->print_cr(" Dropped %d Refs out of %d " |
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1389 "Refs in discovered list " INTPTR_FORMAT, |
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1390 iter.removed(), iter.processed(), (address)refs_list.head()); |
0 | 1391 } |
1392 ) | |
1393 } | |
1394 | |
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1395 const char* ReferenceProcessor::list_name(uint i) { |
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1396 assert(i >= 0 && i <= _max_num_q * number_of_subclasses_of_ref(), |
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1397 "Out of bounds index"); |
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1398 |
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1399 int j = i / _max_num_q; |
0 | 1400 switch (j) { |
1401 case 0: return "SoftRef"; | |
1402 case 1: return "WeakRef"; | |
1403 case 2: return "FinalRef"; | |
1404 case 3: return "PhantomRef"; | |
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 |