Re: Preemptable Ticket Spinlock

[Rik van Riel]

On 04/22/2013 04:46 PM, Jiannan Ouyang wrote:

> It would still be very interesting to conduct more experiments to
> compare these two, to see if the fairness enforced by pv_lock is
> mandatory, and if preemptable-lock outperforms pv_lock in most cases,
> and how do they work with PLE.

Given the fairly high cost of rescheduling a VCPU (which is likely
to include an IPI), versus the short hold time of most spinlocks,
I have the strong suspicion that your approach would win.

The fairness is only compromised in a limited way and in certain
circumstances, so I am not too worried about that.

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