select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select HARDIRQS_SW_RESEND
- select HAVE_AOUT
select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
select HAVE_ARCH_KGDB
select HAVE_ARCH_SECCOMP_FILTER
default DRAM_BASE if REMAP_VECTORS_TO_RAM
default 0x00000000
help
- The base address of exception vectors.
+ The base address of exception vectors. This must be two pages
+ in size.
config ARM_PATCH_PHYS_VIRT
bool "Patch physical to virtual translations at runtime" if EMBEDDED
There is currently no support for migration of task groups, hence
!SCHED_AUTOGROUP. Furthermore, normal load-balancing must be disabled
between cpus of different type (DISABLE_CPU_SCHED_DOMAIN_BALANCE).
+ When turned on, this option adds sys/kernel/hmp directory which
+ contains the following files:
+ up_threshold - the load average threshold used for up migration
+ (0 - 1023)
+ down_threshold - the load average threshold used for down migration
+ (0 - 1023)
+ hmp_domains - a list of cpumasks for the present HMP domains,
+ starting with the 'biggest' and ending with the
+ 'smallest'.
+ Note that both the threshold files can be written at runtime to
+ control scheduler behaviour.
config SCHED_HMP_PRIO_FILTER
bool "(EXPERIMENTAL) Filter HMP migrations by task priority"
depends on SCHED_HMP
- default y
help
Enables task priority based HMP migration filter. Any task with
a NICE value above the threshold will always be on low-power cpus
bool "Allows changing the load tracking scale through sysfs"
depends on SCHED_HMP
help
- When turned on, this option exports the thresholds and load average
- period value for the load tracking patches through sysfs.
+ When turned on, this option exports the load average period value
+ for the load tracking patches through sysfs.
The values can be modified to change the rate of load accumulation
- and the thresholds used for HMP migration.
- The load_avg_period_ms is the time in ms to reach a load average of
- 0.5 for an idle task of 0 load average ratio that start a busy loop.
- The up_threshold and down_threshold is the value to go to a faster
- CPU or to go back to a slower cpu.
- The {up,down}_threshold are devided by 1024 before being compared
- to the load average.
- For examples, with load_avg_period_ms = 128 and up_threshold = 512,
+ used for HMP migration. 'load_avg_period_ms' is the time in ms to
+ reach a load average of 0.5 for an idle task of 0 load average
+ ratio which becomes 100% busy.
+ For example, with load_avg_period_ms = 128 and up_threshold = 512,
a running task with a load of 0 will be migrated to a bigger CPU after
128ms, because after 128ms its load_avg_ratio is 0.5 and the real
up_threshold is 0.5.
This patch has the same behavior as changing the Y of the load
average computation to
(1002/1024)^(LOAD_AVG_PERIOD/load_avg_period_ms)
- but it remove intermadiate overflows in computation.
+ but removes intermediate overflows in computation.
config HMP_FREQUENCY_INVARIANT_SCALE
bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP"
- depends on HMP_VARIABLE_SCALE && CPU_FREQ
+ depends on SCHED_HMP && CPU_FREQ
help
Scales the current load contribution in line with the frequency
of the CPU that the task was executed on.
migration strategy to interact more predictably with CPUFreq's
asynchronous compute capacity changes.
+config SCHED_HMP_LITTLE_PACKING
+ bool "Small task packing for HMP"
+ depends on SCHED_HMP
+ default n
+ help
+ Allows the HMP Scheduler to pack small tasks into CPUs in the
+ smallest HMP domain.
+ Controlled by two sysfs files in sys/kernel/hmp.
+ packing_enable: 1 to enable, 0 to disable packing. Default 1.
+ packing_limit: runqueue load ratio where a RQ is considered
+ to be full. Default is NICE_0_LOAD * 9/8.
+
config HAVE_ARM_SCU
bool
help
for (multi-)cluster based systems, such as big.LITTLE based
systems.
+config BIG_LITTLE
+ bool "big.LITTLE support (Experimental)"
+ depends on CPU_V7 && SMP
+ select MCPM
+ help
+ This option enables support for the big.LITTLE architecture.
+
+config BL_SWITCHER
+ bool "big.LITTLE switcher support"
+ depends on BIG_LITTLE && MCPM && HOTPLUG_CPU
+ select CPU_PM
+ select ARM_CPU_SUSPEND
+ help
+ The big.LITTLE "switcher" provides the core functionality to
+ transparently handle transition between a cluster of A15's
+ and a cluster of A7's in a big.LITTLE system.
+
+config BL_SWITCHER_DUMMY_IF
+ tristate "Simple big.LITTLE switcher user interface"
+ depends on BL_SWITCHER && DEBUG_KERNEL
+ help
+ This is a simple and dummy char dev interface to control
+ the big.LITTLE switcher core code. It is meant for
+ debugging purposes only.
+
choice
prompt "Memory split"
default VMSPLIT_3G
projects / firefly-linux-kernel-4.4.55.git / blobdiff