Re: [Xen-devel] [PATCH v12 09/11] pvqspinlock, x86: Add para-virtualization support

[Peter Zijlstra <peterz@xxxxxxxxxxxxx>]

On Fri, Oct 24, 2014 at 04:53:27PM -0400, Waiman Long wrote:
> The additional register pressure may just cause a few more register moves
> which should be negligible in the overall performance . The additional
> icache pressure, however, may have some impact on performance. I was trying
> to balance the performance of the pv and non-pv versions so that we won't
> penalize the pv code too much for a bit more performance in the non-pv code.
> Doing it your way will add a lot of function call and register
> saving/restoring to the pv code.

If people care about performance they should not be using virt crap :-)

I only really care about bare metal.

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