Quoting Linus Torvalds <[email protected]>:
> I would suggest that if you wanted to be very careful, you'd simply
> disallow changing - or perhaps just clearing - that DONTCOPY flag on
> special regions (ie ones that have been marked with VM_IO or VM_RESERVED).
Right, this was already proposed here
http://lkml.org/lkml/2005/11/3/81
and I site:
> You're then saying that a process cannot set VM_DONTCOPY on a VM_IO
> area to prevent the first child getting the area, but clear it after
> so the next child does get a copy of the area. I think it'd be wrong
> (surprising) to limit the functionality in that way.
--
Michael S. Tsirkin
Staff Engineer, Mellanox Technologies
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