Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/gc_implementation/parNew/parNewGeneration.cpp
src/share/vm/gc_implementation/parNew/parNewGeneration.cpp
- changeset 5784
- 190899198332
- parent 5516
- 330dfb0476f4
- child 6131
- 86e6d691f2e1
equal
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replaced
| 5783:c1fbf21c7397 | 5784:190899198332 |
|---|---|
| 1101 for (int i = 0; i < 100; i++) { | 1101 for (int i = 0; i < 100; i++) { |
| 1102 sum += i; | 1102 sum += i; |
| 1103 } | 1103 } |
| 1104 } | 1104 } |
| 1105 | 1105 |
| 1106 static const oop ClaimedForwardPtr = oop(0x4); | 1106 static const oop ClaimedForwardPtr = cast_to_oop<intptr_t>(0x4); |
| 1107 | 1107 |
| 1108 // Because of concurrency, there are times where an object for which | 1108 // Because of concurrency, there are times where an object for which |
| 1109 // "is_forwarded()" is true contains an "interim" forwarding pointer | 1109 // "is_forwarded()" is true contains an "interim" forwarding pointer |
| 1110 // value. Such a value will soon be overwritten with a real value. | 1110 // value. Such a value will soon be overwritten with a real value. |
| 1111 // This method requires "obj" to have a forwarding pointer, and waits, if | 1111 // This method requires "obj" to have a forwarding pointer, and waits, if |
| 1224 // This code must come after the CAS test, or it will print incorrect | 1224 // This code must come after the CAS test, or it will print incorrect |
| 1225 // information. | 1225 // information. |
| 1226 if (TraceScavenge) { | 1226 if (TraceScavenge) { |
| 1227 gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (%d)}", | 1227 gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (%d)}", |
| 1228 is_in_reserved(new_obj) ? "copying" : "tenuring", | 1228 is_in_reserved(new_obj) ? "copying" : "tenuring", |
| 1229 new_obj->klass()->internal_name(), old, new_obj, new_obj->size()); | 1229 new_obj->klass()->internal_name(), (void *)old, (void *)new_obj, new_obj->size()); |
| 1230 } | 1230 } |
| 1231 #endif | 1231 #endif |
| 1232 | 1232 |
| 1233 if (forward_ptr == NULL) { | 1233 if (forward_ptr == NULL) { |
| 1234 oop obj_to_push = new_obj; | 1234 oop obj_to_push = new_obj; |
| 1345 // This code must come after the CAS test, or it will print incorrect | 1345 // This code must come after the CAS test, or it will print incorrect |
| 1346 // information. | 1346 // information. |
| 1347 if (TraceScavenge) { | 1347 if (TraceScavenge) { |
| 1348 gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (%d)}", | 1348 gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (%d)}", |
| 1349 is_in_reserved(new_obj) ? "copying" : "tenuring", | 1349 is_in_reserved(new_obj) ? "copying" : "tenuring", |
| 1350 new_obj->klass()->internal_name(), old, new_obj, new_obj->size()); | 1350 new_obj->klass()->internal_name(), (void *)old, (void *)new_obj, new_obj->size()); |
| 1351 } | 1351 } |
| 1352 #endif | 1352 #endif |
| 1353 | 1353 |
| 1354 // Now attempt to install the forwarding pointer (atomically). | 1354 // Now attempt to install the forwarding pointer (atomically). |
| 1355 // We have to copy the mark word before overwriting with forwarding | 1355 // We have to copy the mark word before overwriting with forwarding |
| 1434 // overflow stack draining strategy. If/when we start using fat | 1434 // overflow stack draining strategy. If/when we start using fat |
| 1435 // stacks here, we can go back to using (fat) pointer chains | 1435 // stacks here, we can go back to using (fat) pointer chains |
| 1436 // (although some performance comparisons would be useful since | 1436 // (although some performance comparisons would be useful since |
| 1437 // single global lists have their own performance disadvantages | 1437 // single global lists have their own performance disadvantages |
| 1438 // as we were made painfully aware not long ago, see 6786503). | 1438 // as we were made painfully aware not long ago, see 6786503). |
| 1439 #define BUSY (oop(0x1aff1aff)) | 1439 #define BUSY (cast_to_oop<intptr_t>(0x1aff1aff)) |
| 1440 void ParNewGeneration::push_on_overflow_list(oop from_space_obj, ParScanThreadState* par_scan_state) { | 1440 void ParNewGeneration::push_on_overflow_list(oop from_space_obj, ParScanThreadState* par_scan_state) { |
| 1441 assert(is_in_reserved(from_space_obj), "Should be from this generation"); | 1441 assert(is_in_reserved(from_space_obj), "Should be from this generation"); |
| 1442 if (ParGCUseLocalOverflow) { | 1442 if (ParGCUseLocalOverflow) { |
| 1443 // In the case of compressed oops, we use a private, not-shared | 1443 // In the case of compressed oops, we use a private, not-shared |
| 1444 // overflow stack. | 1444 // overflow stack. |
| 1510 assert(!UseCompressedOops, "Error"); | 1510 assert(!UseCompressedOops, "Error"); |
| 1511 assert(par_scan_state->overflow_stack() == NULL, "Error"); | 1511 assert(par_scan_state->overflow_stack() == NULL, "Error"); |
| 1512 if (_overflow_list == NULL) return false; | 1512 if (_overflow_list == NULL) return false; |
| 1513 | 1513 |
| 1514 // Otherwise, there was something there; try claiming the list. | 1514 // Otherwise, there was something there; try claiming the list. |
| 1515 oop prefix = (oop)Atomic::xchg_ptr(BUSY, &_overflow_list); | 1515 oop prefix = cast_to_oop(Atomic::xchg_ptr(BUSY, &_overflow_list)); |
| 1516 // Trim off a prefix of at most objsFromOverflow items | 1516 // Trim off a prefix of at most objsFromOverflow items |
| 1517 Thread* tid = Thread::current(); | 1517 Thread* tid = Thread::current(); |
| 1518 size_t spin_count = (size_t)ParallelGCThreads; | 1518 size_t spin_count = (size_t)ParallelGCThreads; |
| 1519 size_t sleep_time_millis = MAX2((size_t)1, objsFromOverflow/100); | 1519 size_t sleep_time_millis = MAX2((size_t)1, objsFromOverflow/100); |
| 1520 for (size_t spin = 0; prefix == BUSY && spin < spin_count; spin++) { | 1520 for (size_t spin = 0; prefix == BUSY && spin < spin_count; spin++) { |
| 1524 if (_overflow_list == NULL) { | 1524 if (_overflow_list == NULL) { |
| 1525 // nothing left to take | 1525 // nothing left to take |
| 1526 return false; | 1526 return false; |
| 1527 } else if (_overflow_list != BUSY) { | 1527 } else if (_overflow_list != BUSY) { |
| 1528 // try and grab the prefix | 1528 // try and grab the prefix |
| 1529 prefix = (oop)Atomic::xchg_ptr(BUSY, &_overflow_list); | 1529 prefix = cast_to_oop(Atomic::xchg_ptr(BUSY, &_overflow_list)); |
| 1530 } | 1530 } |
| 1531 } | 1531 } |
| 1532 if (prefix == NULL || prefix == BUSY) { | 1532 if (prefix == NULL || prefix == BUSY) { |
| 1533 // Nothing to take or waited long enough | 1533 // Nothing to take or waited long enough |
| 1534 if (prefix == NULL) { | 1534 if (prefix == NULL) { |
