tree cac0f47717ae21a351c720847fedb41425a10263
parent e2daccb0d0375717efed80b772e9fd1e4c51ae5b
author Li Zhijian <lizhijian@cn.fujitsu.com> 1631257375 +0800
committer Juan Quintela <quintela@redhat.com> 1634625544 +0200

migration/rdma: advise prefetch write for ODP region

The responder mr registering with ODP will sent RNR NAK back to
the requester in the face of the page fault.
---------
ibv_poll_cq wc.status=13 RNR retry counter exceeded!
ibv_poll_cq wrid=WRITE RDMA!
---------
ibv_advise_mr(3) helps to make pages present before the actual IO is
conducted so that the responder does page fault as little as possible.

Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
Reviewed-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>