Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait /notify + callback chains

[Alan Cox]

> Kiobufs have never, ever required the IO to be aligned on any
> particular boundary.  They simply make the assumption that the
> underlying buffered object can be described in terms of pages with
> some arbitrary (non-aligned) start/offset.  Every video framebuffer

start/length per page ?

> I've ever seen satisfies that, so you can easily map an arbitrary
> contiguous region of the framebuffer with a kiobuf already.

Video is non contiguous ranges. In fact if you are blitting to a card with
tiled memory it gets very interesting in its video lists