elevator code in kernel

[Kip Matthew Macy]

Is it necessary for the elevator sorting code to be hard-coded into the
kernel?

Elevator sorting offers little or no benefit to higher performance I./O
devices - An
extreme example would be RAID controllers that have on card memory that
can do
reordering more intelligently themselves. A more general example would
be a typical
IDE drive with a 2MB buffer that automatically reorders writes to
minimize head
movement.