Re: [PATCH 6/7] locking/qspinlock: A fairer queued unfair lock

[Peter Zijlstra]

On Sat, Jul 11, 2015 at 04:36:57PM -0400, Waiman Long wrote:
> For a virtual guest with the qspinlock patch, a simple unfair byte lock
> will be used if PV spinlock is not configured in or the hypervisor
> isn't either KVM or Xen. 

Why do we care about this case enough to add over 300 lines of code?
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