disksort() with swapdev

[Rob Hulsebos]

The 'disksort()' routines I found in several kernels just sort the
incoming I/O request with no preference for I/O done on swapdevices.

I think it would be more efficient if any I/O to be done on swapdevices
is given preference above 'normal' I/O, which can be done if disksort()
checks for it, and inserts the swap I/O requests at the head of the queue.
 
Does anybody know why this is not done ? Are there any special reasons
for it ?

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