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by ori_b
4433 days ago
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You can do this with large reads: read(fd, buf, 100 megs)
can, in the kernel, do something like: read(fd, buf[0:first-page-boundary])
remap(fd, buf[first-page-boundary:last-page-boundary])
read(fd, buf[last-page-boundary:end])
There you go, zero copy reads. Or at least, minimal copy reads -- at most you will get 2 pages worth of copying. |
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