06ad2e9a17
Interactive governor has lived in Android sources for a very long time and this commit is based on the code present in following branch: https://android.googlesource.com/kernel/common android-4.4 The Interactive governor is designed for latency-sensitive workloads, such as interactive user interfaces like the mobile phones and tablets. The interactive governor aims to be significantly more responsive to ramp CPU quickly up when CPU-intensive activity begins. Existing governors sample CPU load at a particular rate, typically every X ms and then update the frequency from a work-handler. This can lead to under-powering UI threads for the period of time during which the user begins interacting with a previously-idle system until the next sample period happens. The 'interactive' governor uses a different approach. A real-time thread is used for scaling up, giving the remaining tasks the CPU performance benefit, unlike existing governors which are more likely to schedule ramp-up work to occur after your performance starved tasks have completed. The Android version of interactive governor also checks whether to scale the CPU frequency up soon after coming out of idle. When the CPU comes out of idle, the governor check if the CPU sampling is overdue or not. If yes, it immediately starts the sampling. Otherwise, the utilization hooks from the scheduler handle the sampling later. If the CPU is very busy from exiting idle to when the evaluation happens, then it assumes that the CPU is under-powered and ramps it to MAX speed. If the CPU was not sufficiently busy to immediately ramp to MAX speed, then the governor evaluates the CPU load since the last speed adjustment, choosing the highest value between that longer-term load or the short-term load since idle exit to determine the CPU speed to ramp to. Idle notifiers will be be handled later and are not included for now. The core of this code is written and maintained (in Android repositories) by Mike Chan and Todd Poyner over a long period of time. Vireshk has made changes to to the governor to align it with the current practices followed with mainline governors, like using utilization hooks from the scheduler and handling kobject (for governor's sysfs directory) in a race free manner. And of course this included general cleanup of the governor as well. Signed-off-by: Mike Chan <mike@android.com> Signed-off-by: Todd Poynor <toddpoynor@google.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
378 lines
11 KiB
Plaintext
378 lines
11 KiB
Plaintext
menu "CPU Frequency scaling"
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config CPU_FREQ
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bool "CPU Frequency scaling"
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select SRCU
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help
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CPU Frequency scaling allows you to change the clock speed of
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CPUs on the fly. This is a nice method to save power, because
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the lower the CPU clock speed, the less power the CPU consumes.
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Note that this driver doesn't automatically change the CPU
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clock speed, you need to either enable a dynamic cpufreq governor
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(see below) after boot, or use a userspace tool.
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For details, take a look at <file:Documentation/cpu-freq>.
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If in doubt, say N.
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if CPU_FREQ
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config CPU_FREQ_GOV_ATTR_SET
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bool
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config CPU_FREQ_GOV_COMMON
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select CPU_FREQ_GOV_ATTR_SET
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select IRQ_WORK
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bool
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config CPU_FREQ_BOOST_SW
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bool
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depends on THERMAL
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config CPU_FREQ_STAT
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bool "CPU frequency transition statistics"
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help
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Export CPU frequency statistics information through sysfs.
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If in doubt, say N.
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choice
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prompt "Default CPUFreq governor"
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default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ
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default CPU_FREQ_DEFAULT_GOV_PERFORMANCE
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help
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This option sets which CPUFreq governor shall be loaded at
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startup. If in doubt, select 'performance'.
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config CPU_FREQ_DEFAULT_GOV_PERFORMANCE
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bool "performance"
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select CPU_FREQ_GOV_PERFORMANCE
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help
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Use the CPUFreq governor 'performance' as default. This sets
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the frequency statically to the highest frequency supported by
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the CPU.
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config CPU_FREQ_DEFAULT_GOV_POWERSAVE
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bool "powersave"
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select CPU_FREQ_GOV_POWERSAVE
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help
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Use the CPUFreq governor 'powersave' as default. This sets
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the frequency statically to the lowest frequency supported by
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the CPU.
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config CPU_FREQ_DEFAULT_GOV_USERSPACE
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bool "userspace"
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select CPU_FREQ_GOV_USERSPACE
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help
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Use the CPUFreq governor 'userspace' as default. This allows
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you to set the CPU frequency manually or when a userspace
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program shall be able to set the CPU dynamically without having
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to enable the userspace governor manually.
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config CPU_FREQ_DEFAULT_GOV_ONDEMAND
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bool "ondemand"
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select CPU_FREQ_GOV_ONDEMAND
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select CPU_FREQ_GOV_PERFORMANCE
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help
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Use the CPUFreq governor 'ondemand' as default. This allows
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you to get a full dynamic frequency capable system by simply
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loading your cpufreq low-level hardware driver.
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Be aware that not all cpufreq drivers support the ondemand
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governor. If unsure have a look at the help section of the
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driver. Fallback governor will be the performance governor.
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config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
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bool "conservative"
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select CPU_FREQ_GOV_CONSERVATIVE
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select CPU_FREQ_GOV_PERFORMANCE
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help
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Use the CPUFreq governor 'conservative' as default. This allows
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you to get a full dynamic frequency capable system by simply
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loading your cpufreq low-level hardware driver.
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Be aware that not all cpufreq drivers support the conservative
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governor. If unsure have a look at the help section of the
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driver. Fallback governor will be the performance governor.
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config CPU_FREQ_DEFAULT_GOV_SCHEDUTIL
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bool "schedutil"
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depends on SMP
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select CPU_FREQ_GOV_SCHEDUTIL
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select CPU_FREQ_GOV_PERFORMANCE
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help
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Use the 'schedutil' CPUFreq governor by default. If unsure,
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have a look at the help section of that governor. The fallback
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governor will be 'performance'.
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config CPU_FREQ_DEFAULT_GOV_INTERACTIVE
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bool "interactive"
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select CPU_FREQ_GOV_INTERACTIVE
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select CPU_FREQ_GOV_PERFORMANCE
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help
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Use the CPUFreq governor 'interactive' as default. This allows
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you to get a full dynamic cpu frequency capable system by simply
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loading your cpufreq low-level hardware driver, using the
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'interactive' governor for latency-sensitive workloads.
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endchoice
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config CPU_FREQ_GOV_PERFORMANCE
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tristate "'performance' governor"
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help
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This cpufreq governor sets the frequency statically to the
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highest available CPU frequency.
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To compile this driver as a module, choose M here: the
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module will be called cpufreq_performance.
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If in doubt, say Y.
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config CPU_FREQ_GOV_POWERSAVE
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tristate "'powersave' governor"
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help
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This cpufreq governor sets the frequency statically to the
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lowest available CPU frequency.
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To compile this driver as a module, choose M here: the
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module will be called cpufreq_powersave.
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If in doubt, say Y.
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config CPU_FREQ_GOV_USERSPACE
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tristate "'userspace' governor for userspace frequency scaling"
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help
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Enable this cpufreq governor when you either want to set the
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CPU frequency manually or when a userspace program shall
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be able to set the CPU dynamically, like on LART
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<http://www.lartmaker.nl/>.
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To compile this driver as a module, choose M here: the
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module will be called cpufreq_userspace.
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For details, take a look at <file:Documentation/cpu-freq/>.
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If in doubt, say Y.
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config CPU_FREQ_GOV_ONDEMAND
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tristate "'ondemand' cpufreq policy governor"
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select CPU_FREQ_GOV_COMMON
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help
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'ondemand' - This driver adds a dynamic cpufreq policy governor.
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The governor does a periodic polling and
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changes frequency based on the CPU utilization.
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The support for this governor depends on CPU capability to
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do fast frequency switching (i.e, very low latency frequency
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transitions).
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To compile this driver as a module, choose M here: the
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module will be called cpufreq_ondemand.
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For details, take a look at linux/Documentation/cpu-freq.
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If in doubt, say N.
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config CPU_FREQ_GOV_CONSERVATIVE
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tristate "'conservative' cpufreq governor"
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depends on CPU_FREQ
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select CPU_FREQ_GOV_COMMON
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help
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'conservative' - this driver is rather similar to the 'ondemand'
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governor both in its source code and its purpose, the difference is
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its optimisation for better suitability in a battery powered
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environment. The frequency is gracefully increased and decreased
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rather than jumping to 100% when speed is required.
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If you have a desktop machine then you should really be considering
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the 'ondemand' governor instead, however if you are using a laptop,
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PDA or even an AMD64 based computer (due to the unacceptable
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step-by-step latency issues between the minimum and maximum frequency
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transitions in the CPU) you will probably want to use this governor.
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To compile this driver as a module, choose M here: the
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module will be called cpufreq_conservative.
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For details, take a look at linux/Documentation/cpu-freq.
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If in doubt, say N.
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config CPU_FREQ_GOV_SCHEDUTIL
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bool "'schedutil' cpufreq policy governor"
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depends on CPU_FREQ && SMP
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select CPU_FREQ_GOV_ATTR_SET
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select IRQ_WORK
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help
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This governor makes decisions based on the utilization data provided
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by the scheduler. It sets the CPU frequency to be proportional to
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the utilization/capacity ratio coming from the scheduler. If the
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utilization is frequency-invariant, the new frequency is also
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proportional to the maximum available frequency. If that is not the
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case, it is proportional to the current frequency of the CPU. The
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frequency tipping point is at utilization/capacity equal to 80% in
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both cases.
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If in doubt, say N.
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config CPU_FREQ_GOV_INTERACTIVE
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tristate "'interactive' cpufreq policy governor"
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depends on CPU_FREQ
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select CPU_FREQ_GOV_ATTR_SET
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select IRQ_WORK
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help
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'interactive' - This driver adds a dynamic cpufreq policy governor
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designed for latency-sensitive workloads.
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This governor attempts to reduce the latency of clock
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increases so that the system is more responsive to
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interactive workloads.
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To compile this driver as a module, choose M here: the
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module will be called cpufreq_interactive.
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For details, take a look at linux/Documentation/cpu-freq.
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If in doubt, say N.
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comment "CPU frequency scaling drivers"
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config CPUFREQ_DT
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tristate "Generic DT based cpufreq driver"
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depends on HAVE_CLK && OF
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# if CPU_THERMAL is on and THERMAL=m, CPUFREQ_DT cannot be =y:
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depends on !CPU_THERMAL || THERMAL
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select CPUFREQ_DT_PLATDEV
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select PM_OPP
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help
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This adds a generic DT based cpufreq driver for frequency management.
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It supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
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systems.
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If in doubt, say N.
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config CPUFREQ_DT_PLATDEV
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bool
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help
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This adds a generic DT based cpufreq platdev driver for frequency
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management. This creates a 'cpufreq-dt' platform device, on the
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supported platforms.
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If in doubt, say N.
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if X86
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source "drivers/cpufreq/Kconfig.x86"
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endif
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if ARM || ARM64
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source "drivers/cpufreq/Kconfig.arm"
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endif
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if PPC32 || PPC64
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source "drivers/cpufreq/Kconfig.powerpc"
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endif
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if AVR32
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config AVR32_AT32AP_CPUFREQ
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bool "CPU frequency driver for AT32AP"
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depends on PLATFORM_AT32AP
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default n
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help
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This enables the CPU frequency driver for AT32AP processors.
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If in doubt, say N.
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endif
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if IA64
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config IA64_ACPI_CPUFREQ
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tristate "ACPI Processor P-States driver"
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depends on ACPI_PROCESSOR
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help
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This driver adds a CPUFreq driver which utilizes the ACPI
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Processor Performance States.
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For details, take a look at <file:Documentation/cpu-freq/>.
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If in doubt, say N.
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endif
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if MIPS
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config BMIPS_CPUFREQ
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tristate "BMIPS CPUfreq Driver"
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help
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This option adds a CPUfreq driver for BMIPS processors with
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support for configurable CPU frequency.
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For now, BMIPS5 chips are supported (such as the Broadcom 7425).
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If in doubt, say N.
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config LOONGSON2_CPUFREQ
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tristate "Loongson2 CPUFreq Driver"
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depends on LEMOTE_MACH2F
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help
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This option adds a CPUFreq driver for loongson processors which
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support software configurable cpu frequency.
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Loongson2F and it's successors support this feature.
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For details, take a look at <file:Documentation/cpu-freq/>.
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If in doubt, say N.
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config LOONGSON1_CPUFREQ
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tristate "Loongson1 CPUFreq Driver"
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depends on LOONGSON1_LS1B
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help
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This option adds a CPUFreq driver for loongson1 processors which
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support software configurable cpu frequency.
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For details, take a look at <file:Documentation/cpu-freq/>.
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If in doubt, say N.
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endif
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if SPARC64
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config SPARC_US3_CPUFREQ
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tristate "UltraSPARC-III CPU Frequency driver"
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help
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This adds the CPUFreq driver for UltraSPARC-III processors.
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For details, take a look at <file:Documentation/cpu-freq>.
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If in doubt, say N.
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config SPARC_US2E_CPUFREQ
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tristate "UltraSPARC-IIe CPU Frequency driver"
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help
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This adds the CPUFreq driver for UltraSPARC-IIe processors.
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For details, take a look at <file:Documentation/cpu-freq>.
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If in doubt, say N.
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endif
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if SUPERH
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config SH_CPU_FREQ
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tristate "SuperH CPU Frequency driver"
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help
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This adds the cpufreq driver for SuperH. Any CPU that supports
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clock rate rounding through the clock framework can use this
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driver. While it will make the kernel slightly larger, this is
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harmless for CPUs that don't support rate rounding. The driver
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will also generate a notice in the boot log before disabling
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itself if the CPU in question is not capable of rate rounding.
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For details, take a look at <file:Documentation/cpu-freq>.
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If unsure, say N.
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endif
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config QORIQ_CPUFREQ
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tristate "CPU frequency scaling driver for Freescale QorIQ SoCs"
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depends on OF && COMMON_CLK && (PPC_E500MC || ARM || ARM64)
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depends on !CPU_THERMAL || THERMAL
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select CLK_QORIQ
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help
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This adds the CPUFreq driver support for Freescale QorIQ SoCs
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which are capable of changing the CPU's frequency dynamically.
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endif
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endmenu
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