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

Michael R. Hines
2013-04-05T21:32:40Z

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@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.
>