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

[Michael R. Hines]

Well, I have the "is_dup_page()" commented out.......when RDMA is 
activated.....

Is there something else in QEMU that could be touching the page that I 
don't know about?

- Michael


On 04/05/2013 05:03 PM, Roland Dreier wrote:
> On Fri, Apr 5, 2013 at 1:51 PM, Michael R. Hines
> <mrhines@xxxxxxxxxxxxxxxxxx> 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.

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