linux-kernel - Re: [PATCH V2 0/2] cpufreq: ondemand: add AMD specific powersave bias

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Message-ID: <20130401193839.GA15738@jshin-Toonie>
Date:	Mon, 1 Apr 2013 14:38:39 -0500
From:	Jacob Shin <jacob.shin@....com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Viresh Kumar <viresh.kumar@...aro.org>
CC:	<cpufreq@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 0/2] cpufreq: ondemand: add AMD specific powersave bias

On Fri, Mar 29, 2013 at 08:18:54AM +0530, Viresh Kumar wrote:
> On 28 March 2013 23:54, Jacob Shin <jacob.shin@....com> wrote:
> > This patchset adds AMD specific powersave bias function to the ondemand
> > governor; which can be used to help ondemand governor make more power conscious
> > frequency change decisions based on feedback from hardware (availble on AMD
> > Family 16h and above).
> >
> > Hardware feedback tells software how "sensitive" to frequency changes the
> > workloads are. CPU-bound workloads will be more sensitive -- they will
> > perform better as frequency increases. Memory/IO-bound workloads will be less
> > sensitive -- they will not necessarily perform better as frequnecy increases.
> >
> > This patchset was compared against ondemand governor without powersave bias
> > and did not show any performance degradation on CPU-bound workloads such as
> > kernbench and unixbench. While saving power on Memory-bound workloads such as
> > stream.
> >
> > This applies to linux-pm's linux-next branch, on top of Viresh's 'Implement
> > per policy instance of governor' V4 patchset:
> >
> > https://lkml.org/lkml/2013/3/27/348
> >
> > V2:
> > * Added proper include files to amd_freq_sensitivity.c
> > * Only register powersave_bias_target function pointer and not the entire
> >   od_ops.
> >
> > Jacob Shin (2):
> >   cpufreq: ondemand: allow custom powersave_bias_target function to be
> >     registered
> >   cpufreq: AMD "frequency sensitivity feedback" powersave bias for
> >     ondemand governor
> >
> >  arch/x86/include/uapi/asm/msr-index.h  |    1 +
> >  drivers/cpufreq/Kconfig.x86            |   10 +++
> >  drivers/cpufreq/Makefile               |    1 +
> >  drivers/cpufreq/amd_freq_sensitivity.c |  147 ++++++++++++++++++++++++++++++++
> >  drivers/cpufreq/cpufreq_governor.h     |    3 +
> >  drivers/cpufreq/cpufreq_ondemand.c     |   22 ++++-
> >  6 files changed, 181 insertions(+), 3 deletions(-)
> >  create mode 100644 drivers/cpufreq/amd_freq_sensitivity.c
> 
> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
> 

Hi Rafael,

If this looks okay to you,
please commit to linux-next when you get the chance.

Thanks!

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