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SubjectRe: [PATCH 2/3] kvm hypervisor : Add hypercalls to support pv-ticketlock
On Wed, Jan 19, 2011 at 06:21:12PM +0100, Peter Zijlstra wrote:
> I didn't really read the patch, and I totally forgot everything from
> when I looked at the Xen series, but does the Xen/KVM hypercall
> interface for this include the vcpu to await the kick from?

No not yet, for reasons you mention below.

> My guess is not, since the ticket locks used don't know who the owner
> is, which is of course, sad. There are FIFO spinlock implementations
> that can do this though.. although I think they all have a bigger memory
> footprint.
>
> The reason for wanting this should be clear I guess, it allows PI.

Yeah - that would be good to experiment with.

- vatsa


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