KiCheckStall

VOID __stdcall KiCheckStall(_KPRCB *Prcb, UINT8 Sleep){
  _KPRCB *v3; 
  LARGE_INTEGER v5; 
  union _LARGE_INTEGER v6; 
  v6.QuadPart = 0i64;
  v3 = (_KPRCB *)KiFreezeStallOwner;
  if( Prcb == (_KPRCB *)KiFreezeStallOwner )
  {
    v5 = KeQueryPerformanceCounter(&v6);
    if( (unsigned __int64)(1000 * (v5.QuadPart - KiLastStallTick)) / v6.QuadPart > 0x1F4 )
      KiLastStallTick = v5.QuadPart;
  }
  if( Sleep && v3 && v3 != Prcb && KiDebuggerOwner && (_KPRCB *)KiDebuggerOwner != Prcb )
    _mm_pause();
}

Referenced by:

KeStallExecutionProcessor
KeStallWhileFrozen
KeSwitchFrozenProcessor
KiFreezeTargetExecution