Re: [PATCH v3 7/7] x86/tlb: add tlb_flushall_factor into sysfs foruser change

[Borislav Petkov]

On Tue, May 08, 2012 at 08:20:25AM -0700, H. Peter Anvin wrote:
> On 05/08/2012 08:11 AM, Peter Zijlstra wrote:
> > On Tue, 2012-05-08 at 22:03 +0800, Alex Shi wrote:
> >> kernel will replace cr3 rewrite with invlpg when
> >> 	tlb flush entries <= 1/tlb_flushall_factor
> >> if tlb_flushall_factor is 0, kernel won't do this replace.
> >>
> >> User can modify its value according to specific applications.
> > 
> > Yay!, another useless config knob :-(
> > 
> 
> I think this one is mostly for benchmarking new silicon to find out the
> proper value, I'm guessing?

Yep, this was supposed to be for pinpointing the proper entries count.
I believe we don't have this thing of having code intree but not really
intree - only for testing new silicon. Maybe a debug module or add this
to debugfs?

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Boris.

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