CONFIG_PREEMPT_LL: Preemptible Kernel (Low-Latency Desktop)

General informations

The Linux kernel configuration item CONFIG_PREEMPT_LL:

• prompt: Preemptible Kernel (Low-Latency Desktop)
• type: bool
• depends on: ! CONFIG_ARCH_NO_PREEMPT
• defined in kernel/Kconfig.preempt
• found in Linux kernels: 5.3-rc+HEAD

Help text

This option reduces the latency of the kernel by making all kernel code (that is not executing in a critical section) preemptible. This allows reaction to interactive events by permitting a low priority process to be preempted involuntarily even if it is in kernel mode executing a system call and would otherwise not be about to reach a natural preemption point. This allows applications to run more 'smoothly' even when the system is under load, at the cost of slightly lower throughput and a slight runtime overhead to kernel code.

Select this if you are building a kernel for a desktop or embedded system with latency requirements in the milliseconds range.

Hardware

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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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