Re: [PATCH v3] x86/vdso: Handle clock_gettime(CLOCK_TAI) in vDSO

[Florian Weimer]

On 09/09/2018 10:05 PM, Thomas Gleixner wrote:
> See the patch below. It's integrating TAI without slowing down everything
> and it definitely does not result in indirect calls.
>
> On a HSW it slows down clock_gettime() by ~0.5ns. On a SKL I get a speedup
> by ~0.5ns. On a AMD Epyc server it's 1.2ns speedup. So it somehow depends
> on the uarch and I also observed compiler version dependend variations.

Does this mean glibc can keep using a single vDSO entrypoint, the one we 
have today?

Thanks,
Florian