How to define CLOCK_TICK_RATE in linux kernel 2.6.xx?

[Eric Miao]

On Tue, Aug 24, 2010 at 5:20 PM, David Yang <david.yangshuai at gmail.com> wrote:
> Hello all,
>
> We have recently started to port linux 2.6.33 to a arm machine which be
> cortex-a9 mpcore, and we found that need define CLOCK_TICK_RATE
> (arch/arm/mach_xxx/include/mach/timex.h) to a value.
>

It's obsoleted. Give it a fake value and go.

> Now our arm machine have two timer, first is external general timer
> which clock is 66.666666MHz, second is cortex-a9's private timer which
> clock is 400MHz or 800Hz.

The tick rate used by your OS timer is probably a good fake value.

>
> If our linux system support smp, we should how define CLOCK_TICK_RATE?
> If our linux system don't support smp, we should how define
> CLOCK_TICK_RATE?

It's basically not related to SMP.

>
> BTW, In kernel 2.6.x, CLOCK_TICK_RATE means ?
> Thank for any help

It was historically related to many things, including HZ, yet obsoleted
along with the introduction of clockevent/clocksource framework.

>
> David
>
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