Messages in this thread | | | From | "Rafael J. Wysocki" <> | 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 |
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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.
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