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SubjectRe: Patch for tracing c states (power_end) on x86
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On Wed, 2010-02-24 at 09:19 +0100, Robert Schöne wrote:
> Hello,
>
> Since noone replied to my last mail (Febr. 15th, 11:42), describing the
> way to fix the missing c-state tracing, here's a patch.
> Maybe its easier that way.
>
> (I used the perf-fixes-for-linus git tree to obtain a
> more-then-up-to-date version)

Arjan, any comments?, you seem skilled with this power stuff ;-)

> diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
> index 02d6780..b1cfb88 100644
> --- a/arch/x86/kernel/process.c
> +++ b/arch/x86/kernel/process.c
> @@ -384,6 +384,7 @@ void default_idle(void)
> else
> local_irq_enable();
> current_thread_info()->status |= TS_POLLING;
> + trace_power_end(1);
> } else {
> local_irq_enable();
> /* loop is done by the caller */
> @@ -451,6 +452,7 @@ void mwait_idle_with_hints(unsigned long ax,
> unsigned long cx)
> if (!need_resched())
> __mwait(ax, cx);
> }
> + trace_power_end((ax>>4)+1);
> }
>
> /* Default MONITOR/MWAIT with no hints, used for default C1 state */
> @@ -467,6 +469,7 @@ static void mwait_idle(void)
> __sti_mwait(0, 0);
> else
> local_irq_enable();
> + trace_power_end(1);
> } else
> local_irq_enable();
> }
>


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