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SubjectRe: [RFC] Fast assurate clock readable from user space and NMI handler
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On Tue, 2007-02-27 at 07:29 +0100, Ingo Molnar wrote:
> * Daniel Walker <dwalker@mvista.com> wrote:
>
> > The pit clocksource could be dropped pretty easy with my clocksource
> > update patches, which I'm still working on but you could easily drop
> > clock sources that aren't atomic like the pit .. Also the pit is
> > generally undesirable, so it's not going to be missed.
>
> that's totally unacceptable, and i'm amazed you are even suggesting it -
> often the PIT ends up being the most reliable hardware clock in a PC.
> Btw., what's wrong with the spinlock that is protecting PIT access? It
> expresses the non-atomic property of the PIT just fine.

Just considering the rating is lower than the acpi_pm (and the TSC), and
it's not even considered on SMP systems is enough for me .. It's just a
problematic clock..

Again, I'm not suggesting we drop it all the time, just for a special
case when Mathieu needs it dropped.

Daniel

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