typedef enum _MM_POOL_FAILURE_REASONS
{
         MmNonPagedNoPtes = 0,
         MmPriorityTooLow = 1,
         MmNonPagedNoPagesAvailable = 2,
         MmPagedNoPtes = 3,
         MmSessionPagedNoPtes = 4,
         MmPagedNoPagesAvailable = 5,
         MmSessionPagedNoPagesAvailable = 6,
         MmPagedNoCommit = 7,
         MmSessionPagedNoCommit = 8,
         MmNonPagedNoResidentAvailable = 9,
         MmNonPagedNoCommit = 10,
         MmMaximumFailureReason = 11
} MM_POOL_FAILURE_REASONS;

Windows Vista Kernel Structures