linux-kernel - Re: [PATCH 4/4] omap: cpu: Power tracking support for cgroup cpuacct

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Message-ID: <4BF43535.3090908@ti.com>
Date:	Wed, 19 May 2010 14:00:05 -0500
From:	Nishanth Menon <nm@...com>
To:	Mike Chan <mike@...roid.com>,
	Kevin Hilman <khilman@...prootsystems.com>
CC:	Thomas Renninger <trenn@...e.de>,
	"menage@...gle.com" <menage@...gle.com>,
	"balbir@...ibm.com" <balbir@...ibm.com>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: Re: [PATCH 4/4] omap: cpu: Power tracking support for cgroup cpuacct

Mike Chan had written, on 05/19/2010 01:56 PM, the following:
> On Wed, May 19, 2010 at 8:34 AM, Thomas Renninger <trenn@...e.de> wrote:
>> On Wednesday 19 May 2010 15:11:03 Nishanth Menon wrote:
>>> Mike Chan had written, on 05/18/2010 08:30 PM, the following:
>>>> Specify new power field in struct omap_opp, which is
>>>> power exported in milliWatt.
>> ...
>>>> +           totalpower += cpuacct_freq[i] * mpu_opps[i + 1].power;
>> ...
>>>> +   unsigned long power; /* power consumed running at OPP in
>> milliWatts */
>>> this conflicts with the OPP layer implementation. this structure will
>>> disappear for good.
> 
> Okay, I wasn't sure what to use. The omap-pm branch uses omap_opp for
> the mpu frequencies. However it looks like struct prcm_config is used
> in linux-next for mpu frequencies, but there are deprecated comments
> around this struct definition so I'm not sure where what struct I
> should be using.

Kevin can probably comment on opp upstream plans.

> 
>> Ah yes, another question:
>> The power variable in struct omap_opp never gets initialized
>> with a sane value, something is wrong...
>>
> 
> You're right, this last patch won't work on linux-next, it seems quite
> a bit has changed in the omap specific. Previously board files can
> register their OPP table which is an array of struct omp_opp, which is
> exactly what I do for Droid in our android-omap branch.
> 
> I'm hoping some omap folks can offer some suggestions for what needs
> to be changed.
> 
> -- Mike
> 
>>     Thomas
>>


-- 
Regards,
Nishanth Menon
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