Re: [PATCHv2] rdma: add a new IB_ACCESS_GIFT flag

Roland Dreier
2013-04-05T21:03:56Z

On Fri, Apr 5, 2013 at 1:51 PM, Michael R. Hines
<mrhines@linux.vnet.ibm.com> wrote:
> Sorry, I was wrong. ignore the comments about cgroups. That's still broken.
> (i.e. trying to register RDMA memory while using a cgroup swap limit cause
> the process get killed).
>
> But the GIFT flag patch works (my understanding is that GIFT flag allows the
> adapter to transmit stale memory information, it does not have anything to
> do with cgroups specifically).

The point of the GIFT patch is to avoid triggering copy-on-write so
that memory doesn't blow up during migration. If that doesn't work
then there's no point to the patch.

- R.