From: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
To: Jonathan Corbet <corbet@lwn.net>
Cc: linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org
Subject: Re: [RFC v01 1/3] PowerCap: Documentation
Date: Mon, 05 Aug 2013 12:52:08 -0700 [thread overview]
Message-ID: <52000268.7050205@linux.intel.com> (raw)
In-Reply-To: <20130805130958.33da86c3@lwn.net>
On 08/05/2013 12:09 PM, Jonathan Corbet wrote:
> On Fri, 2 Aug 2013 11:08:50 -0700
> Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> wrote:
>
>> +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.
> Sorry if I'm slow, but... power is an instantaneous quantity, so why would
> you use a counter for it? And why would you want to reset it to zero?
It is an instantaneous value. When I say counter, either in hardware or
in driver somewhere,
it is reading energy and using a time delta and continuously updating
this value.
Reset to zero will allow user space to reset its internal energy counter
used to calculate power.
Our hardware at this time can only provide energy_uj at this time, added
power_uw for some future devices.
This was suggested in internal reviews. But based on feedback, we can
drop this attribute totally,
till we have a device needing this.
> Thanks,
>
> jon
>
next prev parent reply other threads:[~2013-08-05 19:44 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-02 18:08 [RFC v01 0/3] Power Capping Framework Srinivas Pandruvada
2013-08-02 18:08 ` [RFC v01 1/3] PowerCap: Documentation Srinivas Pandruvada
2013-08-03 0:10 ` Joe Perches
2013-08-03 0:23 ` Srinivas Pandruvada
2013-08-03 0:25 ` Joe Perches
2013-08-05 19:09 ` Jonathan Corbet
2013-08-05 19:52 ` Srinivas Pandruvada [this message]
2013-08-02 18:08 ` [RFC v01 2/3] PowerCap: Add class driver Srinivas Pandruvada
2013-08-02 22:43 ` Joe Perches
2013-08-03 0:06 ` Srinivas Pandruvada
2013-08-02 18:08 ` [RFC v01 3/3] PowerCap: Added to drivers build Srinivas Pandruvada
2013-08-02 22:29 ` [RFC v01 0/3] Power Capping Framework Greg KH
2013-08-02 23:52 ` Srinivas Pandruvada
2013-08-03 0:53 ` Greg KH
2013-08-04 19:36 ` Arjan van de Ven
2013-08-02 22:30 ` Greg KH
2013-08-02 22:33 ` Joe Perches
2013-08-02 22:50 ` Greg KH
2013-08-03 0:03 ` Srinivas Pandruvada
2013-08-03 0:54 ` Greg KH
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