Messages in this thread | | | Date | Wed, 12 Oct 2016 09:52:34 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [PATCH v2] x86/tsc: Set X86_FEATURE_TSC_RELIABLE to skip refined calibration |
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On Tue, 11 Oct 2016, Bin Gao wrote: > On Fri, Aug 26, 2016 at 12:14:58PM +0200, Thomas Gleixner wrote: > > The Linux kernel does think a reliable calibration implies the reliability (i.e. > no watchdog required). I'm posting some code pieces to explain.
I know that and I know exactly how all that works. And I certainly did not ask for an explanation of the current state of affairs. Here is what I wrote:
> > Second thoughts. We should seperate the calibration aspect from the reliablity > > aspect. > > > > If a MSR/CPUID readout provides reliable calibration then this does not tell > > us about the reliablity (i.e. no watchdog required). So having two flags for > > this - and sure you can set both on those SoCs is the proper solution.
In other words: I want to have two seperate flags:
1) FEATURE_KNOWN_FREQUENCY - Grab the frequency from CPUID/MSR or whatever and skip the whole calibration thing
2) FEATURE_RELIABLE - Do not invoke the watchdog
Thanks,
tglx
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