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Re: [Xen-devel] [PATCH 9/9] qspinlock, x86, kvm: Implement KVM support for paravirt qspinlock

On 03/20/2015 02:38 AM, Waiman Long wrote:
On 03/19/2015 06:01 AM, Peter Zijlstra wrote:
You are probably right. The initial apply_paravirt() was done before the
SMP boot. Subsequent ones were at kernel module load time. I put a
counter in the __native_queue_spin_unlock() and it registered 26949
unlock calls in a 16-cpu guest before it got patched out.

because even printks take lock..

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