364 if (UseRTMForStackLocks) {
365 if (!FLAG_IS_DEFAULT(UseRTMForStackLocks)) {
366 warning("UseRTMForStackLocks flag should be off when UseRTMLocking flag is off");
367 }
368 FLAG_SET_DEFAULT(UseRTMForStackLocks, false);
369 }
370 if (UseRTMDeopt) {
371 FLAG_SET_DEFAULT(UseRTMDeopt, false);
372 }
373 if (PrintPreciseRTMLockingStatistics) {
374 FLAG_SET_DEFAULT(PrintPreciseRTMLockingStatistics, false);
375 }
376 }
377
378 // This machine allows unaligned memory accesses
379 if (FLAG_IS_DEFAULT(UseUnalignedAccesses)) {
380 FLAG_SET_DEFAULT(UseUnalignedAccesses, true);
381 }
382 }
383
384 void VM_Version::print_platform_virtualization_info(outputStream* st) {
385 const char* info_file = "/proc/ppc64/lparcfg";
386 const char* kw[] = { "system_type=", // qemu indicates PowerKVM
387 "partition_entitled_capacity=", // entitled processor capacity percentage
388 "partition_max_entitled_capacity=",
389 "capacity_weight=", // partition CPU weight
390 "partition_active_processors=",
391 "partition_potential_processors=",
392 "entitled_proc_capacity_available=",
393 "capped=", // 0 - uncapped, 1 - vcpus capped at entitled processor capacity percentage
394 "shared_processor_mode=", // (non)dedicated partition
395 "system_potential_processors=",
396 "pool=", // CPU-pool number
397 "pool_capacity=",
398 "NumLpars=", // on non-KVM machines, NumLpars is not found for full partition mode machines
399 NULL };
400 if (!print_matching_lines_from_file(info_file, st, kw)) {
401 st->print_cr(" <%s Not Available>", info_file);
402 }
403 }
404
405 bool VM_Version::use_biased_locking() {
406 #if INCLUDE_RTM_OPT
407 // RTM locking is most useful when there is high lock contention and
408 // low data contention. With high lock contention the lock is usually
409 // inflated and biased locking is not suitable for that case.
410 // RTM locking code requires that biased locking is off.
411 // Note: we can't switch off UseBiasedLocking in get_processor_features()
412 // because it is used by Thread::allocate() which is called before
413 // VM_Version::initialize().
414 if (UseRTMLocking && UseBiasedLocking) {
415 if (FLAG_IS_DEFAULT(UseBiasedLocking)) {
416 FLAG_SET_DEFAULT(UseBiasedLocking, false);
417 } else {
418 warning("Biased locking is not supported with RTM locking; ignoring UseBiasedLocking flag." );
419 UseBiasedLocking = false;
420 }
421 }
422 #endif
423 return UseBiasedLocking;
424 }
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364 if (UseRTMForStackLocks) {
365 if (!FLAG_IS_DEFAULT(UseRTMForStackLocks)) {
366 warning("UseRTMForStackLocks flag should be off when UseRTMLocking flag is off");
367 }
368 FLAG_SET_DEFAULT(UseRTMForStackLocks, false);
369 }
370 if (UseRTMDeopt) {
371 FLAG_SET_DEFAULT(UseRTMDeopt, false);
372 }
373 if (PrintPreciseRTMLockingStatistics) {
374 FLAG_SET_DEFAULT(PrintPreciseRTMLockingStatistics, false);
375 }
376 }
377
378 // This machine allows unaligned memory accesses
379 if (FLAG_IS_DEFAULT(UseUnalignedAccesses)) {
380 FLAG_SET_DEFAULT(UseUnalignedAccesses, true);
381 }
382 }
383
384 bool VM_Version::use_biased_locking() {
385 #if INCLUDE_RTM_OPT
386 // RTM locking is most useful when there is high lock contention and
387 // low data contention. With high lock contention the lock is usually
388 // inflated and biased locking is not suitable for that case.
389 // RTM locking code requires that biased locking is off.
390 // Note: we can't switch off UseBiasedLocking in get_processor_features()
391 // because it is used by Thread::allocate() which is called before
392 // VM_Version::initialize().
393 if (UseRTMLocking && UseBiasedLocking) {
394 if (FLAG_IS_DEFAULT(UseBiasedLocking)) {
395 FLAG_SET_DEFAULT(UseBiasedLocking, false);
396 } else {
397 warning("Biased locking is not supported with RTM locking; ignoring UseBiasedLocking flag." );
398 UseBiasedLocking = false;
399 }
400 }
401 #endif
402 return UseBiasedLocking;
403 }
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