typedef struct _PF_KERNEL_GLOBALS
{
     UINT64 AccessBufferAgeThreshold;
     EX_RUNDOWN_REF AccessBufferRef;
     KEVENT AccessBufferExistsEvent;
     ULONG AccessBufferMax;
     SLIST_HEADER AccessBufferList;
     LONG StreamSequenceNumber;
     ULONG Flags;
     LONG ScenarioPrefetchCount;
} PF_KERNEL_GLOBALS, *PPF_KERNEL_GLOBALS;

Windows Vista Kernel Structures