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SubjectRe: [PATCH 2/3] kvm hypervisor : Add hypercalls to support pv-ticketlock
On 01/20/2011 03:42 AM, Srivatsa Vaddagiri wrote:
> On Wed, Jan 19, 2011 at 10:53:52AM -0800, Jeremy Fitzhardinge wrote:
>>> The reason for wanting this should be clear I guess, it allows PI.
>> Well, if we can expand the spinlock to include an owner, then all this
>> becomes moot...
> How so? Having an owner will not eliminate the need for pv-ticketlocks
> afaict. We still need a mechanism to reduce latency in scheduling the next
> thread-in-waiting, which is achieved by your patches.

No, sorry, I should have been clearer. I meant that going to the effort
of not increasing the lock size to record "in slowpath" state.

J


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