Root/kernel/time/Kconfig

1#
2# Timer subsystem related configuration options
3#
4
5# Options selectable by arch Kconfig
6
7# Watchdog function for clocksources to detect instabilities
8config CLOCKSOURCE_WATCHDOG
9    bool
10
11# Architecture has extra clocksource data
12config ARCH_CLOCKSOURCE_DATA
13    bool
14
15# Timekeeping vsyscall support
16config GENERIC_TIME_VSYSCALL
17    bool
18
19# ktime_t scalar 64bit nsec representation
20config KTIME_SCALAR
21    bool
22
23# Old style timekeeping
24config ARCH_USES_GETTIMEOFFSET
25    bool
26
27# The generic clock events infrastructure
28config GENERIC_CLOCKEVENTS
29    bool
30
31# Migration helper. Builds, but does not invoke
32config GENERIC_CLOCKEVENTS_BUILD
33    bool
34    default y
35    depends on GENERIC_CLOCKEVENTS
36
37# Clockevents broadcasting infrastructure
38config GENERIC_CLOCKEVENTS_BROADCAST
39    bool
40    depends on GENERIC_CLOCKEVENTS
41
42# Automatically adjust the min. reprogramming time for
43# clock event device
44config GENERIC_CLOCKEVENTS_MIN_ADJUST
45    bool
46
47# Generic update of CMOS clock
48config GENERIC_CMOS_UPDATE
49    bool
50
51if GENERIC_CLOCKEVENTS
52menu "Timers subsystem"
53
54# Core internal switch. Selected by NO_HZ / HIGH_RES_TIMERS. This is
55# only related to the tick functionality. Oneshot clockevent devices
56# are supported independ of this.
57config TICK_ONESHOT
58    bool
59
60config NO_HZ
61    bool "Tickless System (Dynamic Ticks)"
62    depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
63    select TICK_ONESHOT
64    help
65      This option enables a tickless system: timer interrupts will
66      only trigger on an as-needed basis both when the system is
67      busy and when the system is idle.
68
69config HIGH_RES_TIMERS
70    bool "High Resolution Timer Support"
71    depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
72    select TICK_ONESHOT
73    help
74      This option enables high resolution timer support. If your
75      hardware is not capable then this option only increases
76      the size of the kernel image.
77
78endmenu
79endif
80

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