[Xen-devel] Re: Performance overhead of paravirt_ops on native identified

["H. Peter Anvin" <hpa@xxxxxxxxx>]

Jeremy Fitzhardinge wrote:
> 
> In this specific instance of this example, yes.  But if you start 
> enabling various spinlock debug options then there'll be code following 
> the call.  It would be hard for the runtime patching machinery to know 
> when it would be safe to do the substitution.
> 

"When it is immediately followed by a ret" seems like a straightforward
rule to me?

        -hpa

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