[openib-general] Re: RDMA memory registration

[Ronald G. Minnich]

> On 5/3/05, David Addison <addy at quadrics.com> wrote:
> > as our recent IOPROC patch on lkml shows, it's not that invasive. There
> > are just 24 hooks added to the Linux VM code paths - which we have been able to
> > maintain outside the mainline tree for many years now.
> > As these hooks only need to synchronise the Elan's MMU state with that of the
> > CPU, the device drivers calls don't change the Linux MM behaviour.
> > 
> > We believe the IOPROC patch is generic and powerful and would allow other
> > RDMA NICs to solve the page registration problems in a different manner.
> > For NICs which require page registration, new VM hooks can be used to avoid
> > pages being unloaded whilst DMAs are active. Our latest cut of the IOPROC patch
> > has such a hook.
> > 

david, I just saw this. I'll need to look at that patch, it sounds pretty 
neat. Thanks


ron