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 16576094b7SJohn Stultzconfig GENERIC_TIME_VSYSCALL 17576094b7SJohn Stultz bool 18576094b7SJohn Stultz 19576094b7SJohn Stultz# Timekeeping vsyscall support 2070639421SJohn Stultzconfig GENERIC_TIME_VSYSCALL_OLD 21b5e498adSThomas Gleixner bool 22b5e498adSThomas Gleixner 23b5e498adSThomas Gleixner# ktime_t scalar 64bit nsec representation 24b5e498adSThomas Gleixnerconfig KTIME_SCALAR 25b5e498adSThomas Gleixner bool 26b5e498adSThomas Gleixner 27b5e498adSThomas Gleixner# Old style timekeeping 28b5e498adSThomas Gleixnerconfig ARCH_USES_GETTIMEOFFSET 29b5e498adSThomas Gleixner bool 30b5e498adSThomas Gleixner 31b5e498adSThomas Gleixner# The generic clock events infrastructure 32b5e498adSThomas Gleixnerconfig GENERIC_CLOCKEVENTS 33b5e498adSThomas Gleixner bool 34b5e498adSThomas Gleixner 35764e0da1SThomas Gleixner# Migration helper. Builds, but does not invoke 36764e0da1SThomas Gleixnerconfig GENERIC_CLOCKEVENTS_BUILD 37764e0da1SThomas Gleixner bool 38764e0da1SThomas Gleixner default y 39764e0da1SThomas Gleixner depends on GENERIC_CLOCKEVENTS 40764e0da1SThomas Gleixner 4112ad1000SMark Rutland# Architecture can handle broadcast in a driver-agnostic way 4212ad1000SMark Rutlandconfig ARCH_HAS_TICK_BROADCAST 4312ad1000SMark Rutland bool 4412ad1000SMark Rutland 45b5e498adSThomas Gleixner# Clockevents broadcasting infrastructure 46b5e498adSThomas Gleixnerconfig GENERIC_CLOCKEVENTS_BROADCAST 47b5e498adSThomas Gleixner bool 48b5e498adSThomas Gleixner depends on GENERIC_CLOCKEVENTS 49b5e498adSThomas Gleixner 50764e0da1SThomas Gleixner# Automatically adjust the min. reprogramming time for 51764e0da1SThomas Gleixner# clock event device 52764e0da1SThomas Gleixnerconfig GENERIC_CLOCKEVENTS_MIN_ADJUST 53764e0da1SThomas Gleixner bool 54764e0da1SThomas Gleixner 55b5e498adSThomas Gleixner# Generic update of CMOS clock 56b5e498adSThomas Gleixnerconfig GENERIC_CMOS_UPDATE 57b5e498adSThomas Gleixner bool 58764e0da1SThomas Gleixner 59764e0da1SThomas Gleixnerif GENERIC_CLOCKEVENTS 60764e0da1SThomas Gleixnermenu "Timers subsystem" 61764e0da1SThomas Gleixner 62764e0da1SThomas Gleixner# Core internal switch. Selected by NO_HZ / HIGH_RES_TIMERS. This is 63764e0da1SThomas Gleixner# only related to the tick functionality. Oneshot clockevent devices 64764e0da1SThomas Gleixner# are supported independ of this. 65764e0da1SThomas Gleixnerconfig TICK_ONESHOT 66764e0da1SThomas Gleixner bool 67764e0da1SThomas Gleixner 68764e0da1SThomas Gleixnerconfig NO_HZ 69764e0da1SThomas Gleixner bool "Tickless System (Dynamic Ticks)" 70764e0da1SThomas Gleixner depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS 71764e0da1SThomas Gleixner select TICK_ONESHOT 72764e0da1SThomas Gleixner help 73764e0da1SThomas Gleixner This option enables a tickless system: timer interrupts will 74764e0da1SThomas Gleixner only trigger on an as-needed basis both when the system is 75764e0da1SThomas Gleixner busy and when the system is idle. 76764e0da1SThomas Gleixner 77764e0da1SThomas Gleixnerconfig HIGH_RES_TIMERS 78764e0da1SThomas Gleixner bool "High Resolution Timer Support" 79764e0da1SThomas Gleixner depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS 80764e0da1SThomas Gleixner select TICK_ONESHOT 81764e0da1SThomas Gleixner help 82764e0da1SThomas Gleixner This option enables high resolution timer support. If your 83764e0da1SThomas Gleixner hardware is not capable then this option only increases 84764e0da1SThomas Gleixner the size of the kernel image. 85764e0da1SThomas Gleixner 86764e0da1SThomas Gleixnerendmenu 87764e0da1SThomas Gleixnerendif 88