linux-kernel - RE: [patch-mm 00/25] High resolution timer updates and x86_64 support

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Message-ID: <653FFBB4508B9042B5D43DC9E18836F501091308@scsmsx415.amr.corp.intel.com>
Date:	Mon, 18 Jun 2007 13:24:33 -0700
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	<Valdis.Kletnieks@...edu>, "Thomas Gleixner" <tglx@...utronix.de>
Cc:	"LKML" <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...l.org>, "Ingo Molnar" <mingo@...e.hu>,
	"Andi Kleen" <ak@...e.de>, "Chris Wright" <chrisw@...s-sol.org>,
	"Arjan van de Ven" <arjan@...radead.org>
Subject: RE: [patch-mm 00/25] High resolution timer updates and x86_64 support - V2

 

>-----Original Message-----
>From: Valdis.Kletnieks@...edu [mailto:Valdis.Kletnieks@...edu] 
>Sent: Monday, June 18, 2007 1:07 PM
>To: Thomas Gleixner
>Cc: LKML; Andrew Morton; Ingo Molnar; Andi Kleen; Chris 
>Wright; Arjan van de Ven; Pallipadi, Venkatesh
>Subject: Re: [patch-mm 00/25] High resolution timer updates 
>and x86_64 support - V2
>
>On Sat, 16 Jun 2007 10:36:00 -0000, Thomas Gleixner said:
>> The following patch series contains:
>> 
>> - dyntick bugfixes for -mm (caused by the cpuidle changes in ACPI)
>> 
>> - updates and improvements to high resolution timer / dynticks 
>> 
>> - high resolution timer / dynticks support for x86_64
>
>Am running with the 22-rc4-mm2-hrt4 patch on my Latitude D820. 
> Mostly seems
>to work, but for some reason the Intel 'powertop' util thinks 
>it's 100% busy:
>
>     PowerTOP version 1.7       (C) 2007 Intel Corporation
>
>Cn          Avg residency (5s)          P-states (frequencies)
>C0 (cpu running)        (100.0%)
>C1                0.0ms ( 0.0%)         2.00 Ghz     0.0%
>C2                0.0ms ( 0.0%)         1.67 Ghz     0.0%
>C3                0.0ms ( 0.0%)         1333 Mhz     0.0%
>                                        1000 Mhz   100.0%
>
>In reality:
>
>[/sys/devices/system/cpu/cpu0/cpuidle] for i in */*; do echo 
>-n "$i: "; cat $i; done
>state0/latency: 1
>state0/power: 1000
>state0/time: 0
>state0/usage: 3
>state1/latency: 1
>state1/power: 500
>state1/time: 1756017623
>state1/usage: 1837402
>state2/latency: 57
>state2/power: 100
>state2/time: -159524787
>state2/usage: 15007443
>

The problem is powertop only understands /proc/acpi/processor/CPU*/power
for
and not /sys..cpuidle for the moment.

I had a patch in recent cpuidle fixes series that makes /proc interface
active
again with cpuidle which should correct this. Those patches are not in
rc4-mm2-hrt4, but are there in latest rc4-hrt and rc5-hrt series.

Thanks,
Venki 
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