PsSetPagePriorityThread

UINT64 __stdcall PsSetPagePriorityThread(_ETHREAD *Thread, UINT64 PagePriority){
  signed __int32 bf_0; 
  unsigned __int32 v3; 

  bf_0 = Thread->$F45B4AB16F4980293A53858F720DB0B5::_bf_0;
  do
  {
    v3 = bf_0;
    bf_0 = _InterlockedCompareExchange(
             (volatile signed __int32 *)&Thread->1296,
             ((_DWORD)PagePriority << 12) | bf_0 & 0xFFFF8FFF,
             bf_0);
  }
  while( bf_0 != v3 );
  return(v3 >> 12) & 7;
}

Referenced by:

CcCompleteAsyncRead
CcPerformReadAhead
IoApplyPriorityInfoThread
MiInitSystem
NtSetInformationProcess
NtSetInformationThread
SmSetThreadPagePriority