From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Viresh Kumar <viresh.kumar@linaro.org>,
Preeti U Murthy <preeti@linux.vnet.ibm.com>
Cc: "linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
Dirk Brandewie <dirk.j.brandewie@intel.com>,
Shreyas Prabhu <shreyas@linux.vnet.ibm.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Patrick Marlier <patrick.marlier@gmail.com>,
"linuxppc-dev@ozlabs.org" <linuxppc-dev@ozlabs.org>,
Dirk Brandewie <dirk.brandewie@gmail.com>,
Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Subject: Re: [PATCH V2 0/2] cpufreq/powernv: Set core pstate to a minimum just before hotplugging it out
Date: Tue, 09 Sep 2014 02:16:03 +0200 [thread overview]
Message-ID: <7863288.1rO87QF8NW@vostro.rjw.lan> (raw)
In-Reply-To: <CAKohpo=chEW_TtXWCHa3OEwrqU25TPBES4icjMVxL6nezrf8+w@mail.gmail.com>
On Friday, September 05, 2014 01:11:22 PM Viresh Kumar wrote:
> On 5 September 2014 13:09, Preeti U Murthy <preeti@linux.vnet.ibm.com> wrote:
> > Today cpus go to winkle when they are offlined. Since it is the deepest
> > idle state that we have, it is expected to save good amount of power as compared
> > to online state, where cores can enter nap/fastsleep only which are
> > shallower idle states.
> > However we observed no powersavings with winkle as compared to nap/fastsleep
> > and traced the problem to the pstate of the core being kept at a high even
> > when the core is offline. This can keep the socket pstate high, thus burning
> > power unnecessarily. This patchset fixes this issue.
> >
> > Changes in V2: Changed smp_call_function_any() to smp_call_function_single() in Patch[2/2]
>
> Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
I've queued up the two patches for 3.18, thanks!
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
prev parent reply other threads:[~2014-09-08 23:56 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-05 7:39 Preeti U Murthy
2014-09-05 7:40 ` [PATCH V2 1/2] cpufreq: Allow stop CPU callback to be used by all cpufreq drivers Preeti U Murthy
2014-09-05 7:40 ` [PATCH V2 2/2] powernv/cpufreq: Set the pstate of the last hotplugged out cpu in policy->cpus to minimum Preeti U Murthy
2014-09-05 7:41 ` [PATCH V2 0/2] cpufreq/powernv: Set core pstate to a minimum just before hotplugging it out Viresh Kumar
2014-09-09 0:16 ` Rafael J. Wysocki [this message]
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