Re: [PATCH] x86: Support always running TSC on Intel CPUs

[Joe Korty <joe.korty@ccur.com>]

On Tue, Nov 18, 2008 at 09:09:52AM +0100, Ingo Molnar wrote:
> 
> * Venki Pallipadi <venkatesh.pallipadi@intel.com> wrote:
> 
> > +	if (c->x86_power & (1 << 8)) {
> >  		set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
> > +		set_cpu_cap(c, X86_FEATURE_NOSTOP_TSC);
> > +	}
> 
> hm, the naming is a bit confusing. We now have 3 variants:
> 
>   X86_FEATURE_TSC
>   X86_FEATURE_CONSTANT_TSC
>   X86_FEATURE_NOSTOP_TSC
> 
> NOSTOP_TSC is basically what CONSTANT_TSC should have been to begin 
> with ;-)
> 
> i'd suggest to rename it to this:
> 
>   X86_FEATURE_TSC
>   X86_FEATURE_CONSTANT_FREQ_TSC
>   X86_FEATURE_STABLE_TSC
> 
> ... with CONSTANT_FREQ_TSC not having any real role in the long run. 
> (it's similarly problematic to a completely unstable TSC)
> 
> does this sound ok?


To me, the new naming has the same head-scratching potential
as the old....

How about:

	X86_FEATURE_TSC
	X86_FEATURE_STABLE_TSC_OBSOLETE
	X86_FEATURE_STABLE_TSC

Joe