Re: [PATCH 3/4] paravirt: add virt_spin_lock pvops function

[Peter Zijlstra]

Guys, please trim email.

On Tue, Sep 05, 2017 at 10:31:46AM -0400, Waiman Long wrote:
> For clarification, I was actually asking if you consider just adding one
> more jump label to skip it for Xen/KVM instead of making
> virt_spin_lock() a pv-op.

I don't understand. What performance are you worried about. Native will
now do: "xor rax,rax; jnz some_cold_label" that's fairly trival code.