CONFIG_NO_IDLE_HZ:

General informations

The Linux kernel configuration item CONFIG_NO_IDLE_HZ has multiple definitions:

found in arch/ia64/xen/Kconfig

The configuration item CONFIG_NO_IDLE_HZ:

• prompt:
• type: bool
• depends on: CONFIG_XEN
• defined in arch/ia64/xen/Kconfig
• found in Linux kernels: 2.6.28–2.6.39, 3.0–3.13

Help text

(none)

Dynamic tick timer found in arch/arm/Kconfig

The configuration item CONFIG_NO_IDLE_HZ:

• prompt: Dynamic tick timer
• type: bool
• depends on: ! CONFIG_GENERIC_CLOCKEVENTS
• defined in arch/arm/Kconfig
• found in Linux kernels: 2.6.13–2.6.26

Help text

Select this option if you want to disable continuous timer ticks and have them programmed to occur as required. This option saves power as the system can remain in idle state for longer.

By default dynamic tick is disabled during the boot, and can be manually enabled with:

echo 1 > /sys/devices/system/timer/timer0/dyn_tick

Alternatively, if you want dynamic tick automatically enabled during boot, pass "dyntick=enable" via the kernel command string.

Please note that dynamic tick may affect the accuracy of timekeeping on some platforms depending on the implementation. Currently at least OMAP, PXA2xx and SA11x0 platforms are known to have accurate timekeeping with dynamic tick.

No HZ timer ticks in idle found in arch/s390/Kconfig

The configuration item CONFIG_NO_IDLE_HZ:

• prompt: No HZ timer ticks in idle
• type: bool
• depends on: (none)
• defined in arch/s390/Kconfig
• found in Linux kernels: 2.6.6–2.6.25

Help text

Switches the regular HZ timer off when the system is going idle. This helps z/VM to detect that the Linux system is idle. VM can then "swap-out" this guest which reduces memory usage. It also reduces the overhead of idle systems.

The HZ timer can be switched on/off via /proc/sys/kernel/hz_timer. hz_timer=0 means HZ timer is disabled. hz_timer=1 means HZ timer is active.

Dynamic tick timer found in arch/sh/Kconfig

The configuration item CONFIG_NO_IDLE_HZ:

• prompt: Dynamic tick timer
• type: bool
• depends on: (none)
• defined in arch/sh/Kconfig
• found in Linux kernels: 2.6.20–2.6.21

Help text

Select this option if you want to disable continuous timer ticks and have them programmed to occur as required. This option saves power as the system can remain in idle state for longer.

By default dynamic tick is disabled during the boot, and can be manually enabled with:

echo 1 > /sys/devices/system/timer/timer0/dyn_tick

Alternatively, if you want dynamic tick automatically enabled during boot, pass "dyntick=enable" via the kernel command string.

Please note that dynamic tick may affect the accuracy of timekeeping on some platforms depending on the implementation.

Hardware

LKDDb

Raw data from LKDDb:

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Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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