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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||
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