Add Interactive, Smartass and SmartassV2 kernel power governors

Put Smartassv2 as default governor
Smartass credits to Erasmux

Documentation/cpu-freq/governors.txt

@@ -28,6 +28,8 @@ Contents:
 2.3  Userspace
 2.4  Ondemand
 2.5  Conservative
+2.6  Interactive
+2.7  SmartassV2
 
 3.   The Governor Interface in the CPUfreq Core
 
@@ -182,6 +184,74 @@ governor but for the opposite direction.  For example when set to its
 default value of '20' it means that if the CPU usage needs to be below
 20% between samples to have the frequency decreased.
 
+
+2.6 Interactive
+---------------
+
+The CPUfreq governor "interactive" is designed for latency-sensitive,
+interactive workloads. This governor sets the CPU speed depending on
+usage, similar to "ondemand" and "conservative" governors.  However,
+the governor is more aggressive about scaling the CPU speed up in
+response to CPU-intensive activity.
+
+Sampling the CPU load every X ms can lead to under-powering the CPU
+for X ms, leading to dropped frames, stuttering UI, etc.  Instead of
+sampling the cpu at a specified rate, the interactive governor will
+check whether to scale the cpu frequency up soon after coming out of
+idle.  When the cpu comes out of idle, a timer is configured to fire
+within 1-2 ticks.  If the cpu is very busy between exiting idle and
+when the timer fires then we assume the cpu is underpowered and ramp
+to MAX speed.
+
+If the cpu was not sufficiently busy to immediately ramp to MAX speed,
+then governor evaluates the cpu load since the last speed adjustment,
+choosing th highest value between that longer-term load or the
+short-term load since idle exit to determine the cpu speed to ramp to.
+
+The tuneable value for this governor are:
+
+min_sample_time: The minimum amount of time to spend at the current
+frequency before ramping down. This is to ensure that the governor has
+seen enough historic cpu load data to determine the appropriate
+workload.  Default is 80000 uS.
+
+go_maxspeed_load: The CPU load at which to ramp to max speed.  Default
+is 85.
+
+2.7 SmartassV2
+---------------
+
+The CPUfreq governor "smartassV2", like other governors, aims to balance
+performance vs battery life by using low frequencies when load is low and
+ramping the frequency when necessary, fast enough to ensure responsiveness.
+
+The implementation of the governor is roughtly based on the idea of interactive.
+The idle loop is used to track when the CPU has idle cycles. The idle loop will
+set a relatively high rate timer to sample the load when appropriate, the timer
+will measure the load since it was set and schedule a work queue task to do the
+actual frequency change when necessary.
+
+The most important tunable is the "ideal" frequency: this governor will aim
+for this frequency, in the sense that it will ramp towards this frequency much
+more aggresively than beyond it - both when ramping up from below this frequency
+and when ramping down from above this frequency. Still, note, that when load is
+low enough the governor should choose the lowest available frequency regardless
+of the ideal frequency and similarly when load is consistently high enough the
+highest available frequency will be used.
+
+Smartass also tracks the state of the screen, and when screen is off (a.k.a
+sleep or suspended in the terms of this governor) a different ideal frequency
+is used. This is the only difference between the screen on and screen off
+states. Proper tuning of the awake_ideal_freq and sleep_ideal_freq should
+allow both high responsiveness when screen is on and utilizing the low
+frequency range when load is low, especially when screen is off.
+
+Finally, smartass is a highly customizable governor with almost everything
+tweakable through the sysfs. For a detailed explaination of each tunable,
+please see the inline comments at the begging of the code (smartass2.c).
+
+
+
 3. The Governor Interface in the CPUfreq Core
 =============================================
 

arch/arm/configs/herring_defconfig

@@ -1,3 +1,39 @@
+#
+# Automatically generated make config: don't edit
+# Linux kernel version: 2.6.35.14
+# Wed Sep 21 05:31:08 2011
+#
+CONFIG_ARM=y
+CONFIG_HAVE_PWM=y
+CONFIG_SYS_SUPPORTS_APM_EMULATION=y
+CONFIG_GENERIC_GPIO=y
+CONFIG_GENERIC_TIME=y
+CONFIG_ARCH_USES_GETTIMEOFFSET=y
+CONFIG_GENERIC_CLOCKEVENTS=y
+CONFIG_HAVE_PROC_CPU=y
+CONFIG_NO_IOPORT=y
+CONFIG_GENERIC_HARDIRQS=y
+CONFIG_STACKTRACE_SUPPORT=y
+CONFIG_HAVE_LATENCYTOP_SUPPORT=y
+CONFIG_LOCKDEP_SUPPORT=y
+CONFIG_TRACE_IRQFLAGS_SUPPORT=y
+CONFIG_HARDIRQS_SW_RESEND=y
+CONFIG_GENERIC_IRQ_PROBE=y
+CONFIG_RWSEM_GENERIC_SPINLOCK=y
+CONFIG_ARCH_HAS_CPUFREQ=y
+CONFIG_GENERIC_HWEIGHT=y
+CONFIG_GENERIC_CALIBRATE_DELAY=y
+CONFIG_NEED_DMA_MAP_STATE=y
+CONFIG_FIQ=y
+CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ=y
+CONFIG_ARM_L1_CACHE_SHIFT_6=y
+CONFIG_VECTORS_BASE=0xffff0000
+CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config"
+CONFIG_CONSTRUCTORS=y
+
+#
+# General setup
+#
 CONFIG_EXPERIMENTAL=y
 # CONFIG_LOCALVERSION_AUTO is not set
 CONFIG_SYSVIPC=y
@@ -32,11 +68,25 @@ CONFIG_PREEMPT=y
 CONFIG_AEABI=y
 CONFIG_CMDLINE="console=ttyFIQ0"
 CONFIG_CPU_FREQ=y
-CONFIG_CPU_FREQ_LOG=y
-CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
+CONFIG_CPU_FREQ_TABLE=y
+# CONFIG_CPU_FREQ_DEBUG is not set
+CONFIG_CPU_FREQ_STAT=y
+# CONFIG_CPU_FREQ_STAT_DETAILS is not set
+# CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
+# CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE is not set
+# CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
+# CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND is not set
+# CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set
+# CONFIG_CPU_FREQ_DEFAULT_GOV_INTERACTIVE is not set
+# CONFIG_CPU_FREQ_DEFAULT_GOV_SMARTASS is not set
+CONFIG_CPU_FREQ_DEFAULT_GOV_SMARTASS2=y
+CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
 CONFIG_CPU_FREQ_GOV_POWERSAVE=y
 CONFIG_CPU_FREQ_GOV_USERSPACE=y
 CONFIG_CPU_FREQ_GOV_CONSERVATIVE=y
+CONFIG_CPU_FREQ_GOV_INTERACTIVE=y
+CONFIG_CPU_FREQ_GOV_SMARTASS=y
+CONFIG_CPU_FREQ_GOV_SMARTASS2=y
 CONFIG_CPU_IDLE=y
 CONFIG_VFP=y
 CONFIG_NEON=y

drivers/cpufreq/Kconfig

@@ -110,6 +110,28 @@ config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
 	  Be aware that not all cpufreq drivers support the conservative
 	  governor. If unsure have a look at the help section of the
 	  driver. Fallback governor will be the performance governor.
+
+config CPU_FREQ_DEFAULT_GOV_INTERACTIVE
+	bool "interactive"
+	select CPU_FREQ_GOV_INTERACTIVE
+	help
+	  Use the CPUFreq governor 'interactive' as default. This allows
+	  you to get a full dynamic cpu frequency capable system by simply
+	  loading your cpufreq low-level hardware driver, using the
+	  'interactive' governor for latency-sensitive workloads.
+
+config CPU_FREQ_DEFAULT_GOV_SMARTASS
+	bool "smartass"
+	select CPU_FREQ_GOV_SMARTASS
+	select CPU_FREQ_GOV_PERFORMANCE
+	help
+	  Use the CPUFreq governor 'smartass' as default.
+
+config CPU_FREQ_DEFAULT_GOV_SMARTASS2
+        bool "smartass2"
+        select CPU_FREQ_GOV_SMARTASS2
+        help
+            Use the CPUFreq governor 'smartassV2' as default.
 endchoice
 
 config CPU_FREQ_GOV_PERFORMANCE
@@ -190,4 +212,22 @@ config CPU_FREQ_GOV_CONSERVATIVE
 
 	  If in doubt, say N.
 
+config CPU_FREQ_GOV_INTERACTIVE
+	tristate "'interactive' cpufreq policy governor"
+	help
+	  'interactive' - This driver adds a dynamic cpufreq policy governor
+	  designed for latency-sensitive workloads.
+
+config CPU_FREQ_GOV_SMARTASS
+	tristate "'smartass' cpufreq governor"
+	depends on CPU_FREQ
+
+config CPU_FREQ_GOV_SMARTASS2
+        tristate "'smartassV2' cpufreq governor"
+        depends on CPU_FREQ
+        help
+            'smartassV2' - a "smart" governor
+            If in doubt, say N.
+
 endif	# CPU_FREQ
+

drivers/cpufreq/Makefile

@@ -9,6 +9,9 @@ obj-$(CONFIG_CPU_FREQ_GOV_POWERSAVE)	+= cpufreq_powersave.o
 obj-$(CONFIG_CPU_FREQ_GOV_USERSPACE)	+= cpufreq_userspace.o
 obj-$(CONFIG_CPU_FREQ_GOV_ONDEMAND)	+= cpufreq_ondemand.o
 obj-$(CONFIG_CPU_FREQ_GOV_CONSERVATIVE)	+= cpufreq_conservative.o
+obj-$(CONFIG_CPU_FREQ_GOV_INTERACTIVE)	+= cpufreq_interactive.o
+obj-$(CONFIG_CPU_FREQ_GOV_SMARTASS)  	+= cpufreq_smartass.o
+obj-$(CONFIG_CPU_FREQ_GOV_SMARTASS2)   += cpufreq_smartass2.o
 
 # CPUfreq cross-arch helpers
 obj-$(CONFIG_CPU_FREQ_TABLE)		+= freq_table.o