668
669
670 julong os::available_memory() {
671 return win32::available_memory();
672 }
673
674 julong os::win32::available_memory() {
675 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
676 // value if total memory is larger than 4GB
677 MEMORYSTATUSEX ms;
678 ms.dwLength = sizeof(ms);
679 GlobalMemoryStatusEx(&ms);
680
681 return (julong)ms.ullAvailPhys;
682 }
683
684 julong os::physical_memory() {
685 return win32::physical_memory();
686 }
687
688 julong os::allocatable_physical_memory(julong size) {
689 #ifdef _LP64
690 return size;
691 #else
692 // Limit to 1400m because of the 2gb address space wall
693 return MIN2(size, (julong)1400*M);
694 #endif
695 }
696
697 // VC6 lacks DWORD_PTR
698 #if _MSC_VER < 1300
699 typedef UINT_PTR DWORD_PTR;
700 #endif
701
702 int os::active_processor_count() {
703 DWORD_PTR lpProcessAffinityMask = 0;
704 DWORD_PTR lpSystemAffinityMask = 0;
705 int proc_count = processor_count();
706 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
707 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
708 // Nof active processors is number of bits in process affinity mask
709 int bitcount = 0;
710 while (lpProcessAffinityMask != 0) {
711 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
712 bitcount++;
713 }
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668
669
670 julong os::available_memory() {
671 return win32::available_memory();
672 }
673
674 julong os::win32::available_memory() {
675 // Use GlobalMemoryStatusEx() because GlobalMemoryStatus() may return incorrect
676 // value if total memory is larger than 4GB
677 MEMORYSTATUSEX ms;
678 ms.dwLength = sizeof(ms);
679 GlobalMemoryStatusEx(&ms);
680
681 return (julong)ms.ullAvailPhys;
682 }
683
684 julong os::physical_memory() {
685 return win32::physical_memory();
686 }
687
688 bool os::has_allocatable_memory_limit(julong& limit) {
689 MEMORYSTATUSEX ms;
690 ms.dwLength = sizeof(ms);
691 GlobalMemoryStatusEx(&ms);
692 #ifdef _LP64
693 limit = (julong)ms.ullAvailVirtual;
694 return true;
695 #else
696 // Limit to 1400m because of the 2gb address space wall
697 limit = MIN2((julong)1400*M, (julong)ms.ullAvailVirtual);
698 return true;
699 #endif
700 }
701
702 // VC6 lacks DWORD_PTR
703 #if _MSC_VER < 1300
704 typedef UINT_PTR DWORD_PTR;
705 #endif
706
707 int os::active_processor_count() {
708 DWORD_PTR lpProcessAffinityMask = 0;
709 DWORD_PTR lpSystemAffinityMask = 0;
710 int proc_count = processor_count();
711 if (proc_count <= sizeof(UINT_PTR) * BitsPerByte &&
712 GetProcessAffinityMask(GetCurrentProcess(), &lpProcessAffinityMask, &lpSystemAffinityMask)) {
713 // Nof active processors is number of bits in process affinity mask
714 int bitcount = 0;
715 while (lpProcessAffinityMask != 0) {
716 lpProcessAffinityMask = lpProcessAffinityMask & (lpProcessAffinityMask-1);
717 bitcount++;
718 }
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