Re: [PATCH] Re: x86_32 tsc/pit and hrtimers

[Chris Snook]

Thomas Gleixner wrote:
> On Wed, 8 Oct 2008, Jeff Hansen wrote:
>
> > [HRTIMER]: Add highres=noverify option to bypass clocksource verification
> >
> > This disregards the CLOCK_SOURCE_MUST_VERIFY flag on all clocksources.
> > This is particularly useful on legacy x86_32 systems that have no ACPI,
> > LAPIC, or HPET timers, where only TSC and PIT are available.
>
> While I agree in principle, adding this to highres is the wrong thing
> to do. This is a property of clocksources and not of high resolution
> timer support.
>
> The affected clocksource is TSC and it should go there as a command
> line option e.g. tsc=stable, which in turn clears the
> CLOCK_SOURCE_MUST_VERIFY flag in the tsc clocksource.
>
> Thanks,
>
> 	tglx

Fair enough, but do you think it's worthwhile to have an option to 
disable CLOCK_SOURCE_MUST_VERIFY checking for all timers, or should we 
implement this on a case-by-case basis when there's legitimate cause, 
like with TSC?

-- Chris
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