Re: [Qemu-devel] [RFC PATCH RDMA support v4: 03/10] more verbose documentation of the RDMA transport

[Michael R. Hines]

I also did a test using RDMA + cgroup, and the kernel killed my QEMU :)

So, infiniband is not smart enough to know how to avoid pinning a zero 
page, I guess.

- Michael

On 03/19/2013 01:14 PM, Paolo Bonzini wrote:
> Il 19/03/2013 18:09, Michael R. Hines ha scritto:
> > Allowing QEMU to swap due to a cgroup limit during migration is a viable
> > overcommit option?
> >
> > I'm trying to keep an open mind, but that would kill the migration
> > time.....
> Would it swap?  Doesn't the kernel back all zero pages with a single
> copy-on-write page?  If that still accounts towards cgroup limits, it
> would be a bug.
>
> Old kernels do not have a shared zero hugepage, and that includes some
> distro kernels.  Perhaps that's the problem.
>
> Paolo