linux-kernel - Re: [PATCH v3 0/6] Power Capping Framework and RAPL Driver

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Message-ID: <2461734.gXdEFC695q@vostro.rjw.lan>
Date:	Thu, 17 Oct 2013 00:41:23 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	linux-kernel@...r.kernel.org
Cc:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	linux-pm@...r.kernel.org, gregkh@...uxfoundation.org,
	len.brown@...el.com, arjan@...ux.intel.com,
	jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH v3 0/6] Power Capping Framework and RAPL Driver

On Friday, October 11, 2013 04:54:54 PM Srinivas Pandruvada wrote:
> Overview
> With the evolution of technologies, which enables power monitoring and limiting,
> more and more devices are able to constrain their power consumption under certain
> limits. There are several use cases for such technologies:
> - Power monitoring: Each device can report its power consumption.
> - Power Limiting: Setting power limits on the devices allows users to guard against
> platform reaching max system power level.
> - Maximize performance: While staying below a power limit, it allows devices to
> automatically adjust performance to meet demands
> - Dynamic control and re-budgeting: If each device can be constrained to some power,
> extra power can redistributed to other devices, which needs additional performance.
> 
> One such example of technologies is RAPL (Running Average Power Limit) mechanism
> available in the latest Intel processors. Intel is slowly adding many devices under
> RAPL control. Also there are other technologies available, for power capping various
> devices. Soon it is very likely that other vendors are also adding or considering
> such implementation.
> 
> Power Capping framework is an effort to have a uniform interface available to Linux
> drivers, which will enable
> - A uniform sysfs interface for all devices which can offer power capping
> - A common API for drivers, which will avoid code duplication and easy
> implementation of client drivers.
> 
> Also submitting Intel RAPL driver using power capping framework.

Are there any comments or objections against this?

If not, I'd like to queue it up for 3.13.

Thanks!

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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