How does the user (especially a user-space user) get informed that the copy is over? Interrupt+transition to and from kernel? Or to add to the question, what's the minimum transfer size for which this is faster than simple memmov?
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Use space can either poll, request for a completion record that could notify user space waiting on a user level mwait() for instance, or request an interrupt and let kernel notify via eventfd for instance.
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