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CONFIG_RCU_FAST_NO_HZ: Accelerate last non-dyntick-idle CPU's grace periods

General informations

The Linux kernel configuration item CONFIG_RCU_FAST_NO_HZ:

Help text

This option permits CPUs to enter dynticks-idle state even if they have RCU callbacks queued, and prevents RCU from waking these CPUs up more than roughly once every four jiffies (by default, you can adjust this using the rcutree.rcu_idle_gp_delay parameter), thus improving energy efficiency. On the other hand, this option increases the duration of RCU grace periods, for example, slowing down synchronize_rcu().

Say Y if energy efficiency is critically important, and you don't care about increased grace-period durations.

Say N if you are unsure.

Hardware

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