On 11/23/2016 09:13 AM, Logan Gunthorpe wrote: > IMO any memory that has been registered for a P2P transaction should be > locked from being evicted. So if there's a get_user_pages call it needs > to be pinned until the put_page. The main issue being with the RDMA > case: handling an eviction when a chunk of memory has been registered as > an MR would be very tricky. The MR may be relied upon by another host > and the kernel would have to inform user-space the MR was invalid then > user-space would have to tell the remote application.
Hello Logan, Are you aware that the Linux kernel already supports ODP (On Demand Paging)? See also the output of git grep -nHi on.demand.paging. See also https://www.openfabrics.org/images/eventpresos/workshops2014/DevWorkshop/presos/Tuesday/pdf/04_ODP_update.pdf. Bart.
