struct HEAP_DEBUGGING_INFORMATION

typedef struct _HEAP_DEBUGGING_INFORMATION
{
     PVOID InterceptorFunction;
     WORD InterceptorValue;
     ULONG ExtendedOptions;
     ULONG StackTraceDepth;
     ULONG MinTotalBlockSize;
     ULONG MaxTotalBlockSize;
     LONG * HeapLeakEnumerationRoutine;
} HEAP_DEBUGGING_INFORMATION, *PHEAP_DEBUGGING_INFORMATION;

Windows Vista Kernel Structures