linux-kernel - Re: [PATCH v2] Introduce Intel RAPL cooling device driver

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Message-ID: <20130405210648.GB18505@kroah.com>
Date:	Fri, 5 Apr 2013 14:06:48 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Platform Driver <platform-driver-x86@...r.kernel.org>,
	Matthew Garrett <matthew.garrett@...ula.com>,
	Zhang Rui <rui.zhang@...el.com>,
	Rafael Wysocki <rafael.j.wysocki@...el.com>,
	Len Brown <len.brown@...el.com>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Joe Perches <joe@...ches.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Paul Bolle <pebolle@...cali.nl>
Subject: Re: [PATCH v2] Introduce Intel RAPL cooling device driver

On Fri, Apr 05, 2013 at 02:02:04PM -0700, Jacob Pan wrote:
> RAPL(Running Average Power Limit) interface provides platform software
> with the ability to monitor, control, and get notifications on SOC
> power consumptions. Since its first appearance on Sandy Bridge, more
> features have being added to extend its usage. In RAPL, platforms are
> divided into domains for fine grained control. These domains include
> package, DRAM controller, CPU core (Power Plane 0), graphics uncore
> (power plane 1), etc.
> 
> The purpose of this driver is to expose RAPL for userspace
> consumption. Overall, RAPL fits in the generic thermal layer in
> that platform level power capping and monitoring are mainly used for
> thermal management and thermal layer provides the abstracted interface
> needed to have portable applications.
> 
> Specifically, userspace is presented with per domain cooling device
> with sysfs links to its true device. Although RAPL domain provides many
> parameters for fine tuning, long term power limit is exposed as the
> single knob via cooling device state. Whereas the rest of the
> parameters are still accessible via the linked RAPL class devices.
> This interface allows both simple and advanced use cases.
> 
> Eventfd is used to provide notifications to the userspace. At per domain
> level, use can choose any event capable parameters to register for
> threshold crossing notifications. This is shamelessly "borrowed" from
> cgroup with some trimming/fitting.
> 
> Zhang, Rui's initial RAPL driver was used as a reference and starting
> point. Many thanks.
> https://lkml.org/lkml/2011/5/26/93
> 
> Unlike the patch above, which is mainly for monitoring, this driver
> focus on the control and usability by user applications.
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>

As described in the cover letter response:
	NACKed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

please redo this based on those comments.

greg k-h
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