Request: I/O request recording

[Felix von Leitner]

I would like to have a user space program that I could run while I cold
start KDE.  The program would then record which I/O pages were read in
which order.  The output of that program could then be used to pre-cache
all those pages, but in an order that reduces disk head movement.
Demand Loading unfortunately produces lots of random page I/O scattered
all over the disk.

Having a way to know which pages are accessed in which order at a
typical cold start would be very benefitial, not only for the purpose
described above but it could also be used as input for a linker code
reordering optimization.

What do you think?

Felix
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