179bf2bb3SThomas Gleixner# 279bf2bb3SThomas Gleixner# Timer subsystem related configuration options 379bf2bb3SThomas Gleixner# 43872c48bSThomas Gleixner 5b5e498adSThomas Gleixner# Options selectable by arch Kconfig 6b5e498adSThomas Gleixner 7b5e498adSThomas Gleixner# Watchdog function for clocksources to detect instabilities 8b5e498adSThomas Gleixnerconfig CLOCKSOURCE_WATCHDOG 9b5e498adSThomas Gleixner bool 10b5e498adSThomas Gleixner 11b5e498adSThomas Gleixner# Architecture has extra clocksource data 12b5e498adSThomas Gleixnerconfig ARCH_CLOCKSOURCE_DATA 13b5e498adSThomas Gleixner bool 14b5e498adSThomas Gleixner 15b5e498adSThomas Gleixner# Timekeeping vsyscall support 16b5e498adSThomas Gleixnerconfig GENERIC_TIME_VSYSCALL 17b5e498adSThomas Gleixner bool 18b5e498adSThomas Gleixner 19b5e498adSThomas Gleixner# ktime_t scalar 64bit nsec representation 20b5e498adSThomas Gleixnerconfig KTIME_SCALAR 21b5e498adSThomas Gleixner bool 22b5e498adSThomas Gleixner 23b5e498adSThomas Gleixner# Old style timekeeping 24b5e498adSThomas Gleixnerconfig ARCH_USES_GETTIMEOFFSET 25b5e498adSThomas Gleixner bool 26b5e498adSThomas Gleixner 27b5e498adSThomas Gleixner# The generic clock events infrastructure 28b5e498adSThomas Gleixnerconfig GENERIC_CLOCKEVENTS 29b5e498adSThomas Gleixner bool 30b5e498adSThomas Gleixner 31764e0da1SThomas Gleixner# Migration helper. Builds, but does not invoke 32764e0da1SThomas Gleixnerconfig GENERIC_CLOCKEVENTS_BUILD 33764e0da1SThomas Gleixner bool 34764e0da1SThomas Gleixner default y 35764e0da1SThomas Gleixner depends on GENERIC_CLOCKEVENTS 36764e0da1SThomas Gleixner 37b5e498adSThomas Gleixner# Clockevents broadcasting infrastructure 38b5e498adSThomas Gleixnerconfig GENERIC_CLOCKEVENTS_BROADCAST 39b5e498adSThomas Gleixner bool 40b5e498adSThomas Gleixner depends on GENERIC_CLOCKEVENTS 41b5e498adSThomas Gleixner 42764e0da1SThomas Gleixner# Automatically adjust the min. reprogramming time for 43764e0da1SThomas Gleixner# clock event device 44764e0da1SThomas Gleixnerconfig GENERIC_CLOCKEVENTS_MIN_ADJUST 45764e0da1SThomas Gleixner bool 46764e0da1SThomas Gleixner 47b5e498adSThomas Gleixner# Generic update of CMOS clock 48b5e498adSThomas Gleixnerconfig GENERIC_CMOS_UPDATE 49b5e498adSThomas Gleixner bool 50764e0da1SThomas Gleixner 51764e0da1SThomas Gleixnerif GENERIC_CLOCKEVENTS 52764e0da1SThomas Gleixnermenu "Timers subsystem" 53764e0da1SThomas Gleixner 54764e0da1SThomas Gleixner# Core internal switch. Selected by NO_HZ / HIGH_RES_TIMERS. This is 55764e0da1SThomas Gleixner# only related to the tick functionality. Oneshot clockevent devices 56764e0da1SThomas Gleixner# are supported independ of this. 57764e0da1SThomas Gleixnerconfig TICK_ONESHOT 58764e0da1SThomas Gleixner bool 59764e0da1SThomas Gleixner 60764e0da1SThomas Gleixnerconfig NO_HZ 61764e0da1SThomas Gleixner bool "Tickless System (Dynamic Ticks)" 62764e0da1SThomas Gleixner depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS 63764e0da1SThomas Gleixner select TICK_ONESHOT 64764e0da1SThomas Gleixner help 65764e0da1SThomas Gleixner This option enables a tickless system: timer interrupts will 66764e0da1SThomas Gleixner only trigger on an as-needed basis both when the system is 67764e0da1SThomas Gleixner busy and when the system is idle. 68764e0da1SThomas Gleixner 69764e0da1SThomas Gleixnerconfig HIGH_RES_TIMERS 70764e0da1SThomas Gleixner bool "High Resolution Timer Support" 71764e0da1SThomas Gleixner depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS 72764e0da1SThomas Gleixner select TICK_ONESHOT 73764e0da1SThomas Gleixner help 74764e0da1SThomas Gleixner This option enables high resolution timer support. If your 75764e0da1SThomas Gleixner hardware is not capable then this option only increases 76764e0da1SThomas Gleixner the size of the kernel image. 77764e0da1SThomas Gleixner 78764e0da1SThomas Gleixnerendmenu 79764e0da1SThomas Gleixnerendif 80