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comparison src/share/vm/memory/referenceProcessor.cpp @ 20755:01dcaba9b3f3

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8047125: (ref) More phantom object references Reviewed-by: mchung, dfuchs, ahgross, jmasa, brutisso, mgerdin Contributed-by: kim.barrett@oracle.com
author jmasa
date Fri, 26 Sep 2014 17:48:10 -0400
parents 8e20ef014b08
children c2844108a708
comparison
equal deleted inserted replaced
20754:2c75e5ef41e9 20755:01dcaba9b3f3
116 } 116 }
117 _discoveredSoftRefs = &_discovered_refs[0]; 117 _discoveredSoftRefs = &_discovered_refs[0];
118 _discoveredWeakRefs = &_discoveredSoftRefs[_max_num_q]; 118 _discoveredWeakRefs = &_discoveredSoftRefs[_max_num_q];
119 _discoveredFinalRefs = &_discoveredWeakRefs[_max_num_q]; 119 _discoveredFinalRefs = &_discoveredWeakRefs[_max_num_q];
120 _discoveredPhantomRefs = &_discoveredFinalRefs[_max_num_q]; 120 _discoveredPhantomRefs = &_discoveredFinalRefs[_max_num_q];
121 _discoveredCleanerRefs = &_discoveredPhantomRefs[_max_num_q];
121 122
122 // Initialize all entries to NULL 123 // Initialize all entries to NULL
123 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { 124 for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) {
124 _discovered_refs[i].set_head(NULL); 125 _discovered_refs[i].set_head(NULL);
125 _discovered_refs[i].set_length(0); 126 _discovered_refs[i].set_length(0);
242 size_t phantom_count = 0; 243 size_t phantom_count = 0;
243 { 244 {
244 GCTraceTime tt("PhantomReference", trace_time, false, gc_timer); 245 GCTraceTime tt("PhantomReference", trace_time, false, gc_timer);
245 phantom_count = 246 phantom_count =
246 process_discovered_reflist(_discoveredPhantomRefs, NULL, false, 247 process_discovered_reflist(_discoveredPhantomRefs, NULL, false,
248 is_alive, keep_alive, complete_gc, task_executor);
249
250 // Process cleaners, but include them in phantom statistics. We expect
251 // Cleaner references to be temporary, and don't want to deal with
252 // possible incompatibilities arising from making it more visible.
253 phantom_count +=
254 process_discovered_reflist(_discoveredCleanerRefs, NULL, false,
247 is_alive, keep_alive, complete_gc, task_executor); 255 is_alive, keep_alive, complete_gc, task_executor);
248 } 256 }
249 257
250 // Weak global JNI references. It would make more sense (semantically) to 258 // Weak global JNI references. It would make more sense (semantically) to
251 // traverse these simultaneously with the regular weak references above, but 259 // traverse these simultaneously with the regular weak references above, but
880 void ReferenceProcessor::balance_all_queues() { 888 void ReferenceProcessor::balance_all_queues() {
881 balance_queues(_discoveredSoftRefs); 889 balance_queues(_discoveredSoftRefs);
882 balance_queues(_discoveredWeakRefs); 890 balance_queues(_discoveredWeakRefs);
883 balance_queues(_discoveredFinalRefs); 891 balance_queues(_discoveredFinalRefs);
884 balance_queues(_discoveredPhantomRefs); 892 balance_queues(_discoveredPhantomRefs);
893 balance_queues(_discoveredCleanerRefs);
885 } 894 }
886 895
887 size_t 896 size_t
888 ReferenceProcessor::process_discovered_reflist( 897 ReferenceProcessor::process_discovered_reflist(
889 DiscoveredList refs_lists[], 898 DiscoveredList refs_lists[],
1038 case REF_FINAL: 1047 case REF_FINAL:
1039 list = &_discoveredFinalRefs[id]; 1048 list = &_discoveredFinalRefs[id];
1040 break; 1049 break;
1041 case REF_PHANTOM: 1050 case REF_PHANTOM:
1042 list = &_discoveredPhantomRefs[id]; 1051 list = &_discoveredPhantomRefs[id];
1052 break;
1053 case REF_CLEANER:
1054 list = &_discoveredCleanerRefs[id];
1043 break; 1055 break;
1044 case REF_NONE: 1056 case REF_NONE:
1045 // we should not reach here if we are an InstanceRefKlass 1057 // we should not reach here if we are an InstanceRefKlass
1046 default: 1058 default:
1047 ShouldNotReachHere(); 1059 ShouldNotReachHere();
1303 return; 1315 return;
1304 } 1316 }
1305 preclean_discovered_reflist(_discoveredPhantomRefs[i], is_alive, 1317 preclean_discovered_reflist(_discoveredPhantomRefs[i], is_alive,
1306 keep_alive, complete_gc, yield); 1318 keep_alive, complete_gc, yield);
1307 } 1319 }
1320
1321 // Cleaner references. Included in timing for phantom references. We
1322 // expect Cleaner references to be temporary, and don't want to deal with
1323 // possible incompatibilities arising from making it more visible.
1324 for (uint i = 0; i < _max_num_q; i++) {
1325 if (yield->should_return()) {
1326 return;
1327 }
1328 preclean_discovered_reflist(_discoveredCleanerRefs[i], is_alive,
1329 keep_alive, complete_gc, yield);
1330 }
1308 } 1331 }
1309 } 1332 }
1310 1333
1311 // Walk the given discovered ref list, and remove all reference objects 1334 // Walk the given discovered ref list, and remove all reference objects
1312 // whose referents are still alive, whose referents are NULL or which 1335 // whose referents are still alive, whose referents are NULL or which
1371 switch (j) { 1394 switch (j) {
1372 case 0: return "SoftRef"; 1395 case 0: return "SoftRef";
1373 case 1: return "WeakRef"; 1396 case 1: return "WeakRef";
1374 case 2: return "FinalRef"; 1397 case 2: return "FinalRef";
1375 case 3: return "PhantomRef"; 1398 case 3: return "PhantomRef";
1399 case 4: return "CleanerRef";
1376 } 1400 }
1377 ShouldNotReachHere(); 1401 ShouldNotReachHere();
1378 return NULL; 1402 return NULL;
1379 } 1403 }
1380 1404