Jeff Garzik wrote:
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.
Yeap, to achieve high streaming rate, it would be best to have
preallocated ring buffer and ring pointers. If this high-bw streaming
thing becomes common, we can add it to sg, I guess.
--
tejun
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