From: Arjan van de Ven <arjan at linux.intel.com>
To: powertop@lists.01.org
Subject: Re: [Powertop] regarding cpuidle stats
Date: Mon, 29 Jul 2013 06:34:15 -0700 [thread overview]
Message-ID: <51F66F57.70307@linux.intel.com> (raw)
In-Reply-To: 51F66978.8070301@linux.intel.com
[-- Attachment #1: Type: text/plain, Size: 462 bytes --]
On 7/29/2013 6:09 AM, Arjan van de Ven wrote:
> On 7/29/2013 3:52 AM, remu kelly wrote:
>> Hi powertop team,
>> I have few questions about powertop as below:-
>> 1) Does powertop use "<debugfs>/cpuidle/stats" for retriving the C state information.
>
> no
>
> it uses various kernel trace points to collect things as they happen
I should mention that we also use hardware counters on systems that have them;
much more accurate than any OS counter ;)
next reply other threads:[~2013-07-29 13:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-29 13:34 Arjan van de Ven [this message]
-- strict thread matches above, loose matches on Subject: below --
2013-07-29 13:09 [Powertop] regarding cpuidle stats Arjan van de Ven
2013-07-29 10:52 remu kelly
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