Re: [PATCH v6 6/6] locking/pvqspinlock: Queue node adaptive spinning

[Peter Zijlstra]

On Mon, Sep 14, 2015 at 03:37:32PM -0400, Waiman Long wrote:
> BTW, the queue head vCPU at pv_wait_head_and_lock() doesn't wait early, it
> will spin the full threshold as there is no way for it to figure out if the
> lock holder is running or not.

We can know its cpu id, right? Surely we should then be able to figure
out if its active or not, I'm thinking the KVM/Xen know these things
somewhere.
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