linux-kernel - Re: [PATCH] powercap/rapl: handle domain energy unit

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Date:	Thu, 12 Mar 2015 23:24:56 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:	Linux PM <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Rafael Wysocki <rafael.j.wysocki@...el.com>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Len Brown <len.brown@...el.com>
Subject: Re: [PATCH] powercap/rapl: handle domain energy unit

On Thursday, March 12, 2015 01:17:39 PM Jacob Pan wrote:
> On Wed, 11 Mar 2015 23:01:30 +0100
> "Rafael J. Wysocki" <rjw@...ysocki.net> wrote:
> 
> > On Wednesday, March 11, 2015 05:55:09 AM Jacob Pan wrote:
> > > The current driver assumes all RAPL domains within a CPU package
> > > have the same energy unit. This is no longer true for HSW server
> > > CPUs since DRAM domain has is own fixed energy unit which can be
> > > different than the package energy unit enumerated by package
> > > power MSR. In fact, the default HSW EP package power unit is 61uJ
> > > whereas DRAM domain unit is 15.3uJ. The result is that DRAM power
> > > consumption is counted 4x more than real power reported by energy
> > > counters.
> > > 
> > > This patch adds domain specific energy unit per cpu type, it allows
> > > domain energy unit to override package energy unit if non zero.
> > > 
> > > Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> > 
> > Should I regard this as a fix for 4.0?  If so, should it also go to
> > "stable" (and which "stable" series should it go to in that case)?
> > 
> yes, it is a bug fix. I think this should be applied to all stable
> kernels since RAPL driver was merged. So 3.10.71 and later.

OK

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