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SubjectRe: [RFC][PATCH 2/2] ACPI: handle timer ticks proactively
Hi!

> This patch takes advantage of the infrastructure introduced in the last
> patch, and allows the processor idle algorithm to proactively choose a
> c-state based on the time the next timer interrupt is expected to occur.
> It preserves the residency metric, so the algorithm should, in theory,
> remain effective against bursts of activity from other interrupt
> sources.
>
> This patch is mostly intended to be illustrative. There may be some
> "#ifdef CONFIG_ACPI" issues, and I would appreciate any advice on
> implementing this more cleanly.
>
> Cheers,
> Adam

> --- a/kernel/timer.c 2006-08-03 13:39:22.000000000 -0400
> +++ b/kernel/timer.c 2006-08-28 17:16:36.000000000 -0400
> @@ -41,6 +41,9 @@
> #include <asm/timex.h>
> #include <asm/io.h>
>
> +#include <acpi/acpi_bus.h>
> +#include <acpi/processor.h>
> +

I sense a problem here, like broken compilation for all non-x86
platforms.

> @@ -1175,6 +1178,10 @@
> {
> struct task_struct *p = current;
> int cpu = smp_processor_id();
> + struct acpi_processor *pr = processors[cpu];
> +
> + if (pr)
> + pr->power.timer_tick = inl(acpi_fadt.xpm_tmr_blk.address);
>

This probably needs to be encapsulated, somehow.

Pavel

--
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