typedef struct _HEAP_VIRTUAL_ALLOC_ENTRY
{
    LIST_ENTRY Entry;
    HEAP_ENTRY_EXTRA ExtraStuff;
    unsigned __int64 CommitSize;
    unsigned __int64 ReserveSize;
    HEAP_ENTRY BusyBlock;
} HEAP_VIRTUAL_ALLOC_ENTRY, *PHEAP_VIRTUAL_ALLOC_ENTRY;