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SubjectRe: [PATCH v7 2/4] virtio_balloon: introduce migration primitives to balloon pages
On Tue, Aug 14, 2012 at 05:11:13PM -0300, Rafael Aquini wrote:
> On Tue, Aug 14, 2012 at 10:51:39PM +0300, Michael S. Tsirkin wrote:
> > What I think you should do is use rcu for access.
> > And here sync rcu before freeing.
> > Maybe an overkill but at least a documented synchronization
> > primitive, and it is very light weight.
> >
>
> I liked your suggestion on barriers, as well.
>

I have not thought about this as deeply as I shouold but is simply rechecking
the mapping under the pages_lock to make sure the page is still a balloon
page an option? i.e. use pages_lock to stabilise page->mapping.

--
Mel Gorman
SUSE Labs


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