Re: [LSF/MM TOPIC] Discuss least bad options for resolving longterm-GUP usage by RDMA

[Christopher Lameter]

On Mon, 11 Feb 2019, Dan Williams wrote:

> An mmap write after a fault due to a hole punch is free to trigger
> SIGBUS if the subsequent page allocation fails. So no, I don't see
> them as the same unless you're allowing for the holder of the MR to
> receive a re-fault failure.

Order 0 page allocation failures are generally not possible in that path.
System will reclaim and OOM before that happens.