The MEMORY_PARTITION_CONFIGURATION_INFORMATION structure (formally _MEMORY_PARTITION_CONFIGURATION_INFORMATION) is produced as output by a successful call to NtManagePartition when given the information class SystemMemoryPartitionInformation (0).

The structure is defined for both 32-bit and 64-bit Windows, but the 32-bit form is useless in practice before Version 1703 because the 32-bit NtManagePartition fails trivially (returning STATUS_NOT_SUPPORTED).

Version Size (x86) Size (x64)
10.0 to 1511 0x1C 0x38
1607 0x34 0x58
1703 0x7C 0xE8
1709 to 2004 0x80 0xF0

The sizes in the preceding table and the offsets, names and types in the next are from type information in private symbol files that Microsoft has included in downloadable packages of public symbol files and still makes available at the public symbol server.

Offset (x86) Offset (x64) Definition Versions Remarks
0x00 0x00
ULONG Flags;
10.0 and higher  
0x04 0x04
ULONG NumaNode;
1607 and higher  
0x08 0x08
ULONG Channel;
1607 and higher  
0x0C 0x0C
ULONG NumberOfNumaNodes;
1607 and higher  
0x04 (10.0 to 1511) 0x08 (10.0 to 1511)
ULONG_PTR TotalNumberOfPages;
10.0 to 1511 next at 0x20 and 0x30
0x08 (10.0 to 1511);
ULONG_PTR ResidentAvailablePages;
10.0 and higher  
0x0C (10.0 to 1511) 0x18 (10.0 to 1511)
ULONG_PTR AvailablePages;
10.0 to 1511 next at 0x24 and 0x38
0x10 (10.0 to 1511);
0x20 (10.0 to 1511);
ULONG_PTR CommittedPages;
10.0 and higher  
0x14 (10.0 to 1511);
0x28 (10.0 to 1511);
ULONG_PTR CommitLimit;
10.0 and higher  
0x18 (10.0 to 1511);
0x30 (10.0 to 1511);
ULONG_PTR PeakCommitment;
10.0 and higher  
0x20 0x30
ULONG_PTR TotalNumberOfPages;
1607 and higher previously at 0x04 and 0x08
0x24 0x38
ULONG_PTR AvailablePages;
1607 and higher previously at 0x0C and 0x18
0x28 0x40
ULONG_PTR ZeroPages;
1607 and higher  
0x2C 0x48
ULONG_PTR FreePages;
1607 and higher  
0x30 0x50
ULONG_PTR StandbyPages;
1607 and higher  
0x34 0x58
ULONG_PTR StandbyPageCountByPriority [8];
1703 and higher  
0x54 0x98
ULONG_PTR RepurposedPagesByPriority [8];
1703 and higher  
0x74 0xD8
ULONG_PTR MaximumCommitLimit;
1703 and higher  
0x78 0xE0
ULONG_PTR DonatedPagesToPartitions;
1703 and higher  
0x7C 0xE8
ULONG PartitionId;
1709 and higher