CONFIG_RCU_NOCB_CPU_CB_BOOST: Offload RCU callback from real-time kthread

General informations

The Linux kernel configuration item CONFIG_RCU_NOCB_CPU_CB_BOOST:

• prompt: Offload RCU callback from real-time kthread
• type: bool
• depends on: ( CONFIG_RCU_NOCB_CPU && CONFIG_RCU_BOOST ) && ( CONFIG_PREEMPT_RT )
• defined in kernel/rcu/Kconfig
• found in Linux kernels: 6.0–6.8, 6.9-rc+HEAD

Help text

Use this option to invoke offloaded callbacks as SCHED_FIFO to avoid starvation by heavy SCHED_OTHER background load. Of course, running as SCHED_FIFO during callback floods will cause the rcuo[ps] kthreads to monopolize the CPU for hundreds of milliseconds or more. Therefore, when enabling this option, it is your responsibility to ensure that latency-sensitive tasks either run with higher priority or run on some other CPU.

Say Y here if you want to set RT priority for offloading kthreads. Say N here if you are building a !PREEMPT_RT kernel and are unsure.

Hardware

LKDDb

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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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