linux-kernel - Re: [PATCH v7 0/7] cpufreq:boost: CPU Boost mode support

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Date:	Tue, 20 Aug 2013 01:29:20 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Lukasz Majewski <l.majewski@...sung.com>
Cc:	Viresh Kumar <viresh.kumar@...aro.org>,
	Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <eduardo.valentin@...com>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Jonghwa Lee <jonghwa3.lee@...sung.com>,
	Lukasz Majewski <l.majewski@...ess.pl>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Myungjoo Ham <myungjoo.ham@...sung.com>,
	"R, Durgadoss" <durgadoss.r@...el.com>
Subject: Re: [PATCH v7 0/7] cpufreq:boost: CPU Boost mode support

On Monday, August 19, 2013 08:50:37 AM Lukasz Majewski wrote:
> On Mon, 19 Aug 2013 12:08:26 +0530 Viresh Kumar viresh.kumar@...aro.org
> wrote,
> > On 13 August 2013 15:38, Lukasz Majewski <l.majewski@...sung.com>
> > wrote:
> > > This patch series introduces support for CPU overclocking technique
> > > called Boost.
> > >
> > > It is a follow up of a LAB governor proposal. Boost is a LAB
> > > component:
> > > http://thread.gmane.org/gmane.linux.kernel/1484746/match=cpufreq
> > >
> > > Boost unifies hardware based solution (e.g. Intel Nehalem) with
> > > software oriented one (like the one done at Exynos).
> > > For this reason cpufreq/freq_table code has been reorganized to
> > > include common code.
> > >
> > > Important design decisions:
> > > - Boost related code is compiled-in unconditionally to cpufreq core
> > > and disabled by default. The cpufreq_driver is responsibile for
> > > setting boost_supported flag and providing set_boost callback(if HW
> > > support is needed). For software managed boost, special Kconfig
> > > flag - CONFIG_CPU_FREQ_BOOST_SW has been defined. It will be
> > > selected only when a target platform has thermal framework properly
> > > configured.
> > >
> > > - struct cpufreq_driver has been extended with boost related fields:
> > >         -- boost_supported - when driver supports boosting
> > >         -- boost_enabled - boost state
> > >         -- set_boost - callback to function, which is necessary to
> > >            enable/disable boost
> > >
> > > - Boost sysfs attribute (/sys/devices/system/cpu/cpufreq/boost) is
> > > visible _only_ when cpufreq driver supports Boost.
> > >
> > > - No special spin_lock for Boost was created. The one from cpufreq
> > > core was reused.
> > >
> > > - The Boost code doesn't rely on any policy. When boost state is
> > > changed, then the policy list is iterated and proper adjustements
> > > are done.
> > >
> > > - To improve safety level, the thermal framework is also extended
> > > to disable software boosting, when thermal trip point is reached.
> > > Then it starts monitoring target temperature to evaluate if boost
> > > can be enabled again. This emulates behaviour similar to HW managed
> > > boost (like x86)
> > >
> > > Tested at HW:
> > >        Exynos 4412 3.11-rc4 Linux
> > >        Intel Core i7-3770 3.11-rc4 Linux
> > >
> > > Above patches were posted on top of linux_pm/linux-next with
> > > following patches applied:
> > >
> > > cpufreq: exynos5440: Fix to skip when new frequency same as current
> > > cpufreq: fix EXYNOS drivers selection
> > >
> > > Lukasz Majewski (7):
> > >   cpufreq: Add boost frequency support in core
> > >   cpufreq:acpi:x86: Adjust the acpi-cpufreq.c code to work with
> > > common boost solution
> > >   thermal:boost: Automatic enable/disable of BOOST feature
> > >   cpufreq:boost:Kconfig: Provide support for software managed BOOST
> > >   cpufreq:exynos:Extend Exynos cpufreq driver to support boost
> > >     framework
> > >   Documentation:cpufreq:boost: Update BOOST documentation
> > >   cpufreq:exynos4x12: Change L0 driver data to CPUFREQ_BOOST_FREQ
> > 
> > Hi Lukasz,
> > 
> 
> Hi Viresh,
> 
> > I haven't found time yet to go through this series.. 
> 
> I've just started wondering if I had send those patches correctly :-).
> 
> > I want to do a
> > deep/careful review this time as these are almost the final patches.
> 
> Ok.
> 
> > 
> > Will try to get over them by the end of this week..
> 
> Ok, I understand.

Do I assume correctly that this stuff has been tested on ACPI-compatible x86
with acpi-cpufreq and everything has worked correctly there?

Rafael

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