Messages in this thread | | | Date | Thu, 18 Aug 2005 11:06:28 +0100 | From | Christoph Hellwig <> | Subject | Re: zero-copy read() interface |
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On Thu, Aug 18, 2005 at 12:01:52PM +0200, Folkert van Heusden wrote: > What about a zero-copy read-interface? > An ioctl (or something) which enables the kernel to do dma directly to > the userspace. Of course this should be limited to the root-user or a > user with special capabilities (rights) since if a drive screws up, data > from a different sector (or so) might end up in the proces' memory. Of > course copying a sector from kernel- to userspace can be done pretty > fast but i.m.h.o. all possible speedimprovements should be made unless > unclean.
It's called O_DIRECT, and doesn't need root, just some alignment-constraints.
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