CONFIG_NO_HZ_FULL: Full dynticks system (tickless)

General informations

The Linux kernel configuration item CONFIG_NO_HZ_FULL:

• prompt: Full dynticks system (tickless)
• type: bool
• depends on: ( CONFIG_SMP ) && ( CONFIG_HAVE_CONTEXT_TRACKING_USER ) && ( CONFIG_HAVE_VIRT_CPU_ACCOUNTING_GEN )
• defined in kernel/time/Kconfig
• found in Linux kernels: 3.10–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.12

Help text

Adaptively try to shutdown the tick whenever possible, even when the CPU is running tasks. Typically this requires running a single task on the CPU. Chances for running tickless are maximized when the task mostly runs in userspace and has few kernel activity.

You need to fill up the nohz_full boot parameter with the desired range of dynticks CPUs to use it. This is implemented at the expense of some overhead in user <-> kernel transitions: syscalls, exceptions and interrupts.

By default, without passing the nohz_full parameter, this behaves just like NO_HZ_IDLE.

If you're a distro say Y.

Hardware

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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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