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

[address@hidden]

ping...

Hey Dave, could you help to take a look :)

Thanks
Zhijian


On 31/07/2021 22:03, Li Zhijian wrote:
> Previous qemu face 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.
>
> Li Zhijian (2):
>    migration/rdma: Try to register On-Demand Paging memory region
>    migration/rdma: advise prefetch write for ODP region
>
>   migration/rdma.c       | 67 ++++++++++++++++++++++++++++++++++++------
>   migration/trace-events |  2 ++
>   2 files changed, 60 insertions(+), 9 deletions(-)
>