typedef struct _RTL_TRACE_DATABASE
{
     ULONG Magic;
     ULONG Flags;
     ULONG Tag;
     PRTL_TRACE_SEGMENT SegmentList;
     ULONG MaximumSize;
     ULONG CurrentSize;
     PVOID Owner;
     RTL_CRITICAL_SECTION Lock;
     ULONG NoOfBuckets;
     PRTL_TRACE_BLOCK * Buckets;
     LONG unsigned * HashFunction;
     ULONG NoOfTraces;
     ULONG NoOfHits;
     ULONG HashCounter[16];
} RTL_TRACE_DATABASE, *PRTL_TRACE_DATABASE;

Windows Vista Kernel Structures