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    SubjectRe: [PATCH v5 0/7] cpufreq:boost: CPU Boost mode support
    On Thu, 04 Jul 2013 10:50:23 +0200, Lukasz Majewski wrote:

    Dear Viresh, Rafael

    Do you have any comments/feedback for me regarding those patches?

    > 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 enable_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
    > selectable 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
    > -- enable_boost - callback to function, which is necessary to
    > enable 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.
    >
    > - All available policies are now stored in a list.
    >
    > - 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 of target temperature to evaluate if boost can
    > be enabled again. This emulates behaviour similar to HW managed boost
    > (like x86)
    >
    > New patches for v5:
    > cpufreq:boost:Kconfig: Enable software managed BOOST support at
    > Kconfig Documentation:cpufreq:boost: Update BOOST documentation
    >
    > Patches dropped at v5:
    > cpufreq: Calculate number of busy CPUs
    > cpufreq: Enable software boost only when up to one busy core is
    > running
    >
    > Tested at: HW:
    > Exynos 4412 3.10 linux
    > Exynos 4210 3.10 linux
    > Compile tested x86_64 defconfig (acpi) - help with HW (Intel Nehalem)
    > test needed
    >
    > The code has been rebased on top of kernel_pm/bleeding-edge (3.11-rc1)
    >
    >
    > Lukasz Majewski (7):
    > cpufreq: Store cpufreq policies in a list
    > cpufreq: Add boost frequency support in core
    > cpufreq:acpi:x86: Adjust the acpi-cpufreq.c code to work with common
    > boost solution
    > cpufreq:exynos:Extend Exynos cpufreq driver to support boost
    > framework
    > thermal:boost: Automatic enable/disable of BOOST feature
    > cpufreq:boost:Kconfig: Enable software managed BOOST support at
    > Kconfig
    > Documentation:cpufreq:boost: Update BOOST documentation
    >
    > Documentation/cpu-freq/boost.txt | 26 ++++-----
    > drivers/cpufreq/Kconfig | 14 +++++
    > drivers/cpufreq/acpi-cpufreq.c | 69 +++++++----------------
    > drivers/cpufreq/cpufreq.c | 115
    > ++++++++++++++++++++++++++++++++++++++
    > drivers/cpufreq/exynos-cpufreq.c | 9 ++-
    > drivers/cpufreq/freq_table.c | 47 +++++++++++++---
    > drivers/thermal/thermal_core.c | 31 ++++++++++
    > include/linux/cpufreq.h | 13 +++++
    > include/linux/thermal.h | 2 + 9 files changed, 257
    > insertions(+), 69 deletions(-)
    >


    --
    Best regards,

    Lukasz Majewski

    Samsung R&D Institute Poland (SRPOL) | Linux Platform Group


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