Messages in this thread | | | Date | Wed, 15 Aug 2012 10:05:28 +0100 | From | Mel Gorman <> | Subject | Re: [PATCH v7 2/4] virtio_balloon: introduce migration primitives to balloon pages |
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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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