linux-kernel - Re: [PATCH] trace power_frequency events on the correct cpu (for Intel x86 CPUs)

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Message-ID: <4BA8F34C.9040401@linux.intel.com>
Date:	Tue, 23 Mar 2010 09:58:52 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Thomas Renninger <trenn@...e.de>
CC:	Robert Schöne <robert.schoene@...dresden.de>,
	Dave Jones <davej@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	cpufreq <cpufreq@...r.kernel.org>, x86@...nel.org
Subject: Re: [PATCH] trace power_frequency events on the correct cpu  (for
 Intel x86 CPUs)

On 3/23/2010 9:57, Thomas Renninger wrote:
> On Tuesday 23 March 2010 17:28:36 Robert SchÃ¶ne wrote:
>> Am Montag, den 22.03.2010, 06:57 -0700 schrieb Arjan van de Ven:
>>> On 3/22/2010 0:04, Robert SchÃ¶ne wrote:
>>>> Am Sonntag, den 21.03.2010, 17:42 -0700 schrieb Arjan van de Ven:
>>>>> On 3/20/2010 14:37, Thomas Renninger wrote:
>>>>>
>>>>>> It also seem to be (hopefully) a minor feature for timechart, so this should
>>>>>> not hurt that much (yet).
>>>>>
>>>>> It's actually a major feature for timechart, and one of the key things I and a bunch of others
>>>>> inside Intel use timechart for.
>>>>>
>>>> It's a major feature for us too.
>>>> I suppose, the cpufreq_notify_transition calls are correct (meaning
>>>> being called for all related cpus) for every driver. So there's still
>>>> the option to include it in the POST_CHANGE section of this function.
>>>> Could this be okay for the both of you?
>>>
>>> post change would work... that gets frequency afaik..
>> Are you ok with this too, Thomas?
> You mean hooking it into cpufreq_stat_notifier_trans() in
> drivers/cpufreq/cpufreq_stats.c?

no


hooking into the post frequency change callback that gets done..
which is guaranteed to be on the right cpu afaics.
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