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

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Date:	Thu, 11 Mar 2010 07:36:17 +0100
From:	Robert Schöne <robert.schoene@...dresden.de>
To:	Peter Zijlstra <peterz@...radead.org>
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

Did anyone look at the problem described and checked the patch?
I still received no reply.

Am Donnerstag, den 25.02.2010, 13:52 +0100 schrieb Peter Zijlstra:
> 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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-- 
Robert Schoene
Technische Universitaet Dresden
Zentrum fuer Informationsdienste und Hochleistungsrechnen
01062 Dresden

Tel.: (0351) 463-42483, Fax: (0351) 463-37773
E-Mail: Robert.Schoene@...dresden.de

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