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CONFIG_RCU_NOCB_CPU_ZERO: CPU 0 is a build_forced no-CBs CPU

General informations

The Linux kernel configuration item CONFIG_RCU_NOCB_CPU_ZERO:

Help text

This option forces CPU 0 to be a no-CBs CPU, so that its RCU callbacks are invoked by a per-CPU kthread whose name begins with "rcuo". Additional CPUs may be designated as no-CBs CPUs using the rcu_nocbs= boot parameter will be no-CBs CPUs. All other CPUs will invoke their own RCU callbacks in softirq context.

Select this if CPU 0 needs to be a no-CBs CPU for real-time or energy-efficiency reasons, but the real reason it exists is to ensure that randconfig testing covers mixed systems.



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