CONFIG_NO_HZ_FULL_SYSIDLE: Detect full-system idle state for full dynticks system

General informations

The Linux kernel configuration item CONFIG_NO_HZ_FULL_SYSIDLE:

• prompt: Detect full-system idle state for full dynticks system
• type: bool
• depends on: CONFIG_NO_HZ_FULL
• defined in kernel/time/Kconfig
• found in Linux kernels: 3.12–3.19, 4.0–4.12

Help text

At least one CPU must keep the scheduling-clock tick running for timekeeping purposes whenever there is a non-idle CPU, where "non-idle" also includes dynticks CPUs as long as they are running non-idle tasks. Because the underlying adaptive-tick support cannot distinguish between all CPUs being idle and all CPUs each running a single task in dynticks mode, the underlying support simply ensures that there is always a CPU handling the scheduling-clock tick, whether or not all CPUs are idle. This Kconfig option enables scalable detection of the all-CPUs-idle state, thus allowing the scheduling-clock tick to be disabled when all CPUs are idle. Note that scalable detection of the all-CPUs-idle state means that larger systems will be slower to declare the all-CPUs-idle state.

Say Y if you would like to help debug all-CPUs-idle detection.

Say N if you are unsure.

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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