Re: [PATCH v2 0/2] enable fsdax rdma migration

[Marcel Apfelbaum]

Hi Zhijian,

On Mon, Aug 23, 2021 at 11:41 AM lizhijian@fujitsu.com
<lizhijian@fujitsu.com> wrote:
>
> CCing  Marcel
>
>
> On 23/08/2021 11:33, Li Zhijian wrote:
> > Previous qemu are facing 2 problems when migrating a fsdax memory backend 
> > with
> > RDMA protocol.
> > (1) ibv_reg_mr failed with Operation not supported
> > (2) requester(source) side could receive RNR NAK.
> >
> > For the (1), we can try to register memory region with ODP feature which
> > has already been implemented in some modern HCA hardware/drivers.
> > For the (2), IB provides advise API to prefetch pages in specific memory
> > region. It can help driver reduce the page fault on responder(destination)
> > side during RDMA_WRITE.
> >
> > CC: marcel.apfelbaum@gmail.com
> >
> > Li Zhijian (2):
> >    migration/rdma: Try to register On-Demand Paging memory region
> >    migration/rdma: advise prefetch write for ODP region
> >
> >   migration/rdma.c       | 117 +++++++++++++++++++++++++++++++++--------
> >   migration/trace-events |   2 +
> >   2 files changed, 98 insertions(+), 21 deletions(-)
> >

Series
Reviewed-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>

Thanks,
Marcel