CONFIG_PREEMPT_DYNAMIC: Preemption behaviour defined on boot

General informations

The Linux kernel configuration item CONFIG_PREEMPT_DYNAMIC has multiple definitions:

Preemption behaviour defined on boot found in kernel/Kconfig.preempt

The configuration item CONFIG_PREEMPT_DYNAMIC:

• prompt: Preemption behaviour defined on boot
• type: bool
• depends on: ( CONFIG_HAVE_PREEMPT_DYNAMIC && ! CONFIG_PREEMPT_RT ) && ( CONFIG_HAVE_PREEMPT_DYNAMIC_CALL )
• defined in kernel/Kconfig.preempt
• found in Linux kernels: 5.16–5.19, 6.0–6.10, 6.11-rc+HEAD

Help text

This option allows to define the preemption model on the kernel command line parameter and thus override the default preemption model defined during compile time.

The feature is primarily interesting for Linux distributions which provide a pre-built kernel binary to reduce the number of kernel flavors they offer while still offering different usecases.

The runtime overhead is negligible with HAVE_STATIC_CALL_INLINE enabled but if runtime patching is not available for the specific architecture then the potential overhead should be considered.

Interesting if you want the same pre-built kernel should be used for both Server and Desktop workloads.

found in kernel/Kconfig.preempt

The configuration item CONFIG_PREEMPT_DYNAMIC:

• prompt:
• type: bool
• depends on: (none)
• defined in kernel/Kconfig.preempt
• found in Linux kernels: 5.12–5.15

Help text

This option allows to define the preemption model on the kernel command line parameter and thus override the default preemption model defined during compile time.

The feature is primarily interesting for Linux distributions which provide a pre-built kernel binary to reduce the number of kernel flavors they offer while still offering different usecases.

The runtime overhead is negligible with HAVE_STATIC_CALL_INLINE enabled but if runtime patching is not available for the specific architecture then the potential overhead should be considered.

Interesting if you want the same pre-built kernel should be used for both Server and Desktop workloads.

Hardware

LKDDb

Raw data from LKDDb:

• (none)

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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