Min version	8.1	10 Pre RTM	10 Pre RTM	10 TH2
Max version	8.1 Update 1		10
x64 offset offset:bitpos	Field Name
0x0000	volatile uint64_t TotalReservedPages
0x0008	volatile uint64_t TotalCommittedPages
0x0010	unsigned long Signature
0x0014	unsigned long GlobalFlags
0x0018	uint16_t ProcessHeapListIndex	uint64_t FreeCommittedPages
0x0020	uint64_t FreeCommittedPages	unsigned long Interceptor
0x0024		uint16_t ProcessHeapListIndex
0x0026		uint16_t GlobalLockCount
0x0028	struct _RTL_SRWLOCK LargeMetadataLock	unsigned long GlobalLockOwner
0x0030	struct _RTL_RB_TREE LargeAllocMetadata	struct _RTL_SRWLOCK LargeMetadataLock
0x0038		struct _RTL_RB_TREE LargeAllocMetadata
0x0040	volatile uint64_t LargeReservedPages
0x0048	volatile uint64_t LargeCommittedPages	volatile uint64_t LargeReservedPages
0x0050	struct _HEAP_LOCK SegmentAllocatorLock	volatile uint64_t LargeCommittedPages
0x0058		struct _HEAP_LOCK SegmentAllocatorLock	struct _RTL_SRWLOCK SegmentAllocatorLock
0x0060			struct _LIST_ENTRY SegmentListHead
0x0070			uint64_t SegmentCount
0x0078	struct _LIST_ENTRY SegmentListHead		struct _RTL_RB_TREE FreePageRanges
0x0080		struct _LIST_ENTRY SegmentListHead
0x0088	uint64_t SegmentCount		uint64_t VirtualizationKey	struct _RTL_SRWLOCK ContextExtendLock
0x0090	struct _RTL_RB_TREE FreePageRanges	uint64_t SegmentCount	struct _RTL_SRWLOCK ContextExtendLock	uint8_t * AllocatedBase
0x0098		struct _RTL_RB_TREE FreePageRanges	uint8_t * AllocatedBase	uint8_t * UncommittedBase
0x00A0	void * NextLocalInfoAddress		uint8_t * UncommittedBase	uint8_t * ReservedLimit
0x00A8	void * NextUncommitedAddress	struct _RTL_SRWLOCK ContextExtendLock	uint8_t * ReservedLimit	struct _HEAP_VS_CONTEXT VsContext
0x00B0	void * ReservedLimit	uint8_t * AllocatedBase	struct _HEAP_VS_CONTEXT VsContext
0x00B8	struct _HEAP_LFH_CONTEXT LfhContext	uint8_t * UncommittedBase
0x00C0		uint8_t * ReservedLimit
0x00C8		struct _HEAP_VS_CONTEXT VsContext
0x0110				struct _HEAP_LFH_CONTEXT LfhContext
0x0120			struct _HEAP_LFH_CONTEXT LfhContext
0x0130		struct _HEAP_LFH_CONTEXT LfhContext