CONFIG_RCU_LAZY: RCU callback lazy invocation functionality

General informations

The Linux kernel configuration item CONFIG_RCU_LAZY:

• prompt: RCU callback lazy invocation functionality
• type: bool
• depends on: CONFIG_RCU_NOCB_CPU
• defined in kernel/rcu/Kconfig
• found in Linux kernels: 6.2–6.14, 6.15-rc+HEAD

Help text

To save power, batch RCU callbacks and delay starting the corresponding grace period for multiple seconds. The grace period will be started after this delay, in case of memory pressure, or if the corresponding CPU's callback list grows too large.

These delays happen only on rcu_nocbs CPUs, that is, CPUs whose callbacks have been offloaded.

Use the rcutree.enable_rcu_lazy=0 kernel-boot parameter to globally disable these delays.

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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