On Tue, 2012-08-21 at 17:40 +0300, Michael S. Tsirkin wrote:
> > + spin_lock(&vb->pages_lock);
> > + page = list_first_or_null_rcu(&vb->pages, struct page, lru);
>
> Why is list_first_or_null_rcu called outside
> RCU critical section here?
It looks like vb->pages_lock is t
On Tue, 2012-08-21 at 17:40 +0300, Michael S. Tsirkin wrote:
> > + vb->balloon_status = BALLOON_REMOVAL;
>
> This needs some kind of barrier.
>
> > kthread_stop(vb->thread);
kthread_stop() implies an smp_wmb() [ because it needs to do a wakeup ].
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On Tue, Aug 21, 2012 at 09:47:46AM -0300, Rafael Aquini wrote:
> Memory fragmentation introduced by ballooning might reduce significantly
> the number of 2MB contiguous memory blocks that can be used within a guest,
> thus imposing performance penalties associated with the reduced number of
> trans
On Tue, Aug 21, 2012 at 09:47:46AM -0300, Rafael Aquini wrote:
> Memory fragmentation introduced by ballooning might reduce significantly
> the number of 2MB contiguous memory blocks that can be used within a guest,
> thus imposing performance penalties associated with the reduced number of
> trans
Memory fragmentation introduced by ballooning might reduce significantly
the number of 2MB contiguous memory blocks that can be used within a guest,
thus imposing performance penalties associated with the reduced number of
transparent huge pages that could be used by the guest workload.
Besides ma
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