linux-kernel - Re: Patch for tracing c states (power

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Date:	Thu, 25 Feb 2010 13:52:00 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Robert Schöne <robert.schoene@...dresden.de>
Cc:	Arjan van de Ven <arjan@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: Patch for tracing c states (power_end) on x86

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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