Tejun Heo wrote:
One thing to think about before supporting streaming from/to harddisks
from userland is how to make data flow efficiently from userland to
kernel and back. But, no matter what, kernel <-> userland usually
involves one data copy, so I don't think making sg similarly efficient
would be too difficult (it might be already).
Actually, the kernel usually maps userland pages, eliminating the need
for a copy. write(2) may have copied data into that page originally,
but mmap(2) need not have.
Jeff
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