Re: Features and bug-fixes that went in Linux 3.2

[Laszlo Ersek <lersek@redhat.com>]

On 01/09/12 23:37, Ian Campbell wrote:
> 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.

(Ultimately I found it here:

     http://lwn.net/Articles/474791/

.)

Ian, do you think the NFS fix in

     http://article.gmane.org/gmane.linux.nfs/45955

for problem

     http://marc.info/?l=linux-nfs&m=122424132729720&w=2

would be technically feasible to port to 2.6.18, based on the existing 
PageForeign stuff instead of parts 1-5 of the series?

Thanks
Laszlo