Re: Demand paging for memory regions (was Re: MMU Notifiers V6)

Steve Wise
2008-02-12T22:02:44Z

Roland Dreier wrote:
> [Adding general@lists.openfabrics.org to get the IB/RDMA people involved]
>
> This thread has patches that add support for notifying drivers when a
> process's memory map changes. The hope is that this is useful for
> letting RDMA devices handle registered memory without pinning the
> underlying pages, by updating the RDMA device's translation tables
> whenever the host kernel's tables change.
>
> Is anyone interested in working on using this for drivers/infiniband?
> I am interested in participating, but I don't think I have enough time
> to do this by myself.

I don't have time, although it would be interesting work!

>
> Also, at least naively it seems that this is only useful for hardware
> that has support for this type of demand paging, and can handle
> not-present pages, generating interrupts for page faults, etc. I know
> that Mellanox HCAs should have this support; are there any other
> devices that can do this?
>

Chelsio's T3 HW doesn't support this.

Steve.