Re: [PATCH v7 2/4] virtio_balloon: introduce migration primitives to balloon pages
From: Mel Gorman <hidden>
Date: 2012-08-15 09:05:34
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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:quoted
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