kernel/time/Kconfig

#
# Timer subsystem related configuration options
#

# Options selectable by arch Kconfig

# Watchdog function for clocksources to detect instabilities
config CLOCKSOURCE_WATCHDOG
	bool

# Architecture has extra clocksource data
config ARCH_CLOCKSOURCE_DATA
	bool

# Timekeeping vsyscall support
config GENERIC_TIME_VSYSCALL
	bool

# Timekeeping vsyscall support
config GENERIC_TIME_VSYSCALL_OLD
	bool

# ktime_t scalar 64bit nsec representation
config KTIME_SCALAR
	bool

# Old style timekeeping
config ARCH_USES_GETTIMEOFFSET
	bool

# The generic clock events infrastructure
config GENERIC_CLOCKEVENTS
	bool

# Migration helper. Builds, but does not invoke
config GENERIC_CLOCKEVENTS_BUILD
	bool
	default y
	depends on GENERIC_CLOCKEVENTS

# Clockevents broadcasting infrastructure
config GENERIC_CLOCKEVENTS_BROADCAST
	bool
	depends on GENERIC_CLOCKEVENTS

# Automatically adjust the min. reprogramming time for
# clock event device
config GENERIC_CLOCKEVENTS_MIN_ADJUST
	bool

# Generic update of CMOS clock
config GENERIC_CMOS_UPDATE
	bool

if GENERIC_CLOCKEVENTS
menu "Timers subsystem"

# Core internal switch. Selected by NO_HZ / HIGH_RES_TIMERS. This is
# only related to the tick functionality. Oneshot clockevent devices
# are supported independ of this.
config TICK_ONESHOT
	bool

config NO_HZ
	bool "Tickless System (Dynamic Ticks)"
	depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
	select TICK_ONESHOT
	help
	  This option enables a tickless system: timer interrupts will
	  only trigger on an as-needed basis both when the system is
	  busy and when the system is idle.

config HIGH_RES_TIMERS
	bool "High Resolution Timer Support"
	depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
	select TICK_ONESHOT
	help
	  This option enables high resolution timer support. If your
	  hardware is not capable then this option only increases
	  the size of the kernel image.

endmenu
endif