linux-kernel - Re: [RFC v01 1/3] PowerCap: Documentation

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Message-ID: <51FC4D9F.1070302@linux.intel.com>
Date:	Fri, 02 Aug 2013 17:23:59 -0700
From:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:	Joe Perches <joe@...ches.com>
CC:	linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org
Subject: Re: [RFC v01 1/3] PowerCap: Documentation

On 08/02/2013 05:10 PM, Joe Perches wrote:
> On Fri, 2013-08-02 at 11:08 -0700, Srinivas Pandruvada wrote:
>> Added power cap framework documentation. This explains the use of power capping framework,
>> sys-fs and programming interface.
> []
Didn't understand this comment.
>> +Power Zone Attributes
>> +=================================
>> +Monitoring attributes
>> +----------------------
>> +	
>> +energy_uj (rw): Current energy counter in micro-joules. Write to energy counter
>> +resets the counter to zero. If the counter can not be reset, then this attribute
>> +is read-only.
>> +
>> +max_energy_range_uj (ro): Range of the above energy counter in micro-joules.
>> +
>> +power_uw (rw): Current power counter in micro-watts. Write to this counter
>> +resets the counter to zero. If the counter can not be reset, then this attribute
>> +is read-only.
>> +max_power_range_uw (ro): Range of the above energy counter in micro-watts.
>> +
>> +It is possible that some domains can have both power and energy counters and
>> +ranges, but at least one is mandatory.
> Given that the ranges seem to be u64s, perhaps the
> lower bounds are too high.  Why not nano/pico/fempto
> watts/joules/seconds?
I think they are too small to realistically set a limits on power or 
measure. Let's see what others think.
>
>
Thanks,
Srinivas
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