Re: [Xen-devel] Features and bug-fixes that went in Linux 3.2

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2012-01-09 at 22:26 +0000, James Harper wrote:
> >  - Initial work laid out for netback page-flipping (also called 
> > zero-copying).
> 
> Isn't this how it used to work originally?

Some of the original infrastructure for doing this was not upstreamable
(the PageForeign stuff) so while upstream netback I decided to go with a
simpler/less-intrusive copying mode so we could have some sort of
networking support in mainline. 

I've been working on re-laying the necessary infrastructure to allow for
page flipping/mapping mode in upstream (as well as fixing another
generic class of bug) -- you can see the "skb frag destructor" patches
on the netdev list.

Ian.



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