Re: Tickless/dyntick kernel, highres timer and general time crapectomy

[Ralf Baechle <ralf@linux-mips.org>]

On Thu, Jun 07, 2007 at 04:44:11PM +0200, Franck Bui-Huu wrote:

> >   No, it doesn't. Even on dyntick kernels, interrupts do happen several
> >times a second. Dynticks have nothing to do with disabling timer
> >interrupts...
> >
> 
> That's true however if your system has 2 clock devices. One is the r4k-hpt
> and the other one soemthing else with a higher rating. If you don't stop
> r4k-hpt interrupts, how does it work ?

To some degree this question is hypothetic because generally the cp0
count/compare timer will be the highest rated counter.

But even if so, the basic solution is the same - just ignore the interrupt
whenever it happens to be triggered.  Or if it isn't shared with an
active performance counter interrupt, you could even disable_irq() it.

  Ralf