Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/runtime/objectMonitor.cpp
src/share/vm/runtime/objectMonitor.cpp
- changeset 8729
- 402618d5afc9
- parent 8067
- c1374141598c
- child 8856
- ac27a9c85bea
- child 8887
- b55756ea22d8
equal
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inserted
replaced
| 8728:8119c543f2af | 8729:402618d5afc9 |
|---|---|
| 2527 SETKNOB(ResetEvent) ; | 2527 SETKNOB(ResetEvent) ; |
| 2528 SETKNOB(MoveNotifyee) ; | 2528 SETKNOB(MoveNotifyee) ; |
| 2529 SETKNOB(FastHSSEC) ; | 2529 SETKNOB(FastHSSEC) ; |
| 2530 #undef SETKNOB | 2530 #undef SETKNOB |
| 2531 | 2531 |
| 2532 if (Knob_Verbose) { | |
| 2533 sanity_checks(); | |
| 2534 } | |
| 2535 | |
| 2532 if (os::is_MP()) { | 2536 if (os::is_MP()) { |
| 2533 BackOffMask = (1 << Knob_SpinBackOff) - 1 ; | 2537 BackOffMask = (1 << Knob_SpinBackOff) - 1 ; |
| 2534 if (Knob_ReportSettings) ::printf ("BackOffMask=%X\n", BackOffMask) ; | 2538 if (Knob_ReportSettings) ::printf ("BackOffMask=%X\n", BackOffMask) ; |
| 2535 // CONSIDER: BackOffMask = ROUNDUP_NEXT_POWER2 (ncpus-1) | 2539 // CONSIDER: BackOffMask = ROUNDUP_NEXT_POWER2 (ncpus-1) |
| 2536 } else { | 2540 } else { |
| 2547 free (knobs) ; | 2551 free (knobs) ; |
| 2548 OrderAccess::fence() ; | 2552 OrderAccess::fence() ; |
| 2549 InitDone = 1 ; | 2553 InitDone = 1 ; |
| 2550 } | 2554 } |
| 2551 | 2555 |
| 2556 void ObjectMonitor::sanity_checks() { | |
| 2557 int error_cnt = 0; | |
| 2558 int warning_cnt = 0; | |
| 2559 bool verbose = Knob_Verbose != 0 NOT_PRODUCT(|| VerboseInternalVMTests); | |
| 2560 | |
| 2561 if (verbose) { | |
| 2562 tty->print_cr("INFO: sizeof(ObjectMonitor)=" SIZE_FORMAT, | |
| 2563 sizeof(ObjectMonitor)); | |
| 2564 } | |
| 2565 | |
| 2566 uint cache_line_size = VM_Version::L1_data_cache_line_size(); | |
| 2567 if (verbose) { | |
| 2568 tty->print_cr("INFO: L1_data_cache_line_size=%u", cache_line_size); | |
| 2569 } | |
| 2570 | |
| 2571 ObjectMonitor dummy; | |
| 2572 u_char *addr_begin = (u_char*)&dummy; | |
| 2573 u_char *addr_header = (u_char*)&dummy._header; | |
| 2574 u_char *addr_owner = (u_char*)&dummy._owner; | |
| 2575 | |
| 2576 uint offset_header = (uint)(addr_header - addr_begin); | |
| 2577 if (verbose) tty->print_cr("INFO: offset(_header)=%u", offset_header); | |
| 2578 | |
| 2579 uint offset_owner = (uint)(addr_owner - addr_begin); | |
| 2580 if (verbose) tty->print_cr("INFO: offset(_owner)=%u", offset_owner); | |
| 2581 | |
| 2582 if ((uint)(addr_header - addr_begin) != 0) { | |
| 2583 tty->print_cr("ERROR: offset(_header) must be zero (0)."); | |
| 2584 error_cnt++; | |
| 2585 } | |
| 2586 | |
| 2587 if (cache_line_size != 0) { | |
| 2588 // We were able to determine the L1 data cache line size so | |
| 2589 // do some cache line specific sanity checks | |
| 2590 | |
| 2591 if ((offset_owner - offset_header) < cache_line_size) { | |
| 2592 tty->print_cr("WARNING: the _header and _owner fields are closer " | |
| 2593 "than a cache line which permits false sharing."); | |
| 2594 warning_cnt++; | |
| 2595 } | |
| 2596 | |
| 2597 if ((sizeof(ObjectMonitor) % cache_line_size) != 0) { | |
| 2598 tty->print_cr("WARNING: ObjectMonitor size is not a multiple of " | |
| 2599 "a cache line which permits false sharing."); | |
| 2600 warning_cnt++; | |
| 2601 } | |
| 2602 } | |
| 2603 | |
| 2604 ObjectSynchronizer::sanity_checks(verbose, cache_line_size, &error_cnt, | |
| 2605 &warning_cnt); | |
| 2606 | |
| 2607 if (verbose || error_cnt != 0 || warning_cnt != 0) { | |
| 2608 tty->print_cr("INFO: error_cnt=%d", error_cnt); | |
| 2609 tty->print_cr("INFO: warning_cnt=%d", warning_cnt); | |
| 2610 } | |
| 2611 | |
| 2612 guarantee(error_cnt == 0, | |
| 2613 "Fatal error(s) found in ObjectMonitor::sanity_checks()"); | |
| 2614 } | |
| 2615 | |
| 2552 #ifndef PRODUCT | 2616 #ifndef PRODUCT |
| 2553 void ObjectMonitor::verify() { | 2617 void ObjectMonitor::verify() { |
| 2554 } | 2618 } |
| 2555 | 2619 |
| 2556 void ObjectMonitor::print() { | 2620 void ObjectMonitor::print() { |
