Re: [PATCH 0/2] Make the TSC safe to be used by gettimeofday().

[Suleiman Souhlal]

Shem Multinymous wrote:
> On 11/14/06, Suleiman Souhlal <ssouhlal@xxxxxxxxxxx> wrote:
>
> > I believe that the results returned will always be monotonic, as long as
> > the frequency of the TSC does not change from under us (that is, without
> > the kernel knowing). This is because we "synchronize" each CPU's vxtime
> > with a global time source (HPET) every time we know the TSC rate changes.
>
>
> Does this hold after a suspend/resume cycle? You could be resuming
> with a different CPU clock than what you suspended with, and I'm not
> sure anything guarantees an early enough re-sync.

I have to admit that I didn't really design this patch with 
suspend/resume in mind, and that I'm not too familiar with how they work.

Do the HPET/ACPI timers still run while the system is suspended?
If not, there shouldn't be any problem, as long as the kernel is 
informed of the resume early enough.

-- Suleiman
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