On Mon, Mar 06, 2006 at 09:07:36PM -0500, Benjamin LaHaise wrote:
> On Tue, Mar 07, 2006 at 04:04:11AM +0200, Dan Aloni wrote:
> > This somehow resembles the scatter-gatter lists already used in some
> > subsystems such as the SCSI sg driver.
>
> None of the iovecs are particularly special. What's special here is that
> particulars of the container make the fast path *cheap*.
>
> > BTW you have to make these pages Copy-On-Write before this procedure
> > starts because you wouldn't want it to accidently fill the zero page,
> > i.e. the VM will have to supply a unique set of pages otherwise it
> > messes up.
>
> No, that would be insanely expensive. There's no way this would be done
> transparently to the user unless we know that we're blocking until the
> transmit is complete.
Sure it can't be transparent to the user, but you can just require the user
to perform mlock on the VMA and you get around this problem.
--
Dan Aloni
[email protected], [email protected], [email protected], [email protected]
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