On Tue, Sep 11 2007, David Howells wrote:
> Jens Axboe <[email protected]> wrote:
>
> > It's a bit of a sledge hammer... Since get_user_pages() appears to work
> > on nummu, we can just disable the vmsplice-to-userspace bits and leave
> > the (working) vmsplice-from-userspace in place.
>
> That sounds about right. I don't think you can do the latter without
> an MMU, but I may be wrong about what it does.
You mean the former? The latter is vmsplice() filling a pipe with user
pages, using get_user_pages() to set them up. And that looks like it
should work on nommu.
The former is vmsplice() using mmap like functionality to map pages into
a user vma.
Just making sure we agree :-)
--
Jens Axboe
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