Re: [patch 2/6] mmu_notifier: Callbacks to invalidate address ranges

Christoph Lameter
2008-02-28T01:03:41Z

On Thu, 28 Feb 2008, Andrea Arcangeli wrote:

> On Wed, Feb 27, 2008 at 04:14:08PM -0800, Christoph Lameter wrote:
> > Erm. This would also be needed by RDMA etc.
>
> The only RDMA I know is Quadrics, and Quadrics apparently doesn't need
> to schedule inside the invalidate methods AFIK, so I doubt the above
> is true. It'd be interesting to know if IB is like Quadrics and it
> also doesn't require blocking to invalidate certain remote mappings.

RDMA works across a network and I would assume that it needs confirmation
that a connection has been torn down before pages can be unmapped.