CONFIG_RCU_DOUBLE_CHECK_CB_TIME: RCU callback-batch backup time check

General informations

The Linux kernel configuration item CONFIG_RCU_DOUBLE_CHECK_CB_TIME:

• prompt: RCU callback-batch backup time check
• type: bool
• depends on: CONFIG_RCU_EXPERT
• defined in kernel/rcu/Kconfig
• found in Linux kernels: 6.5–6.8, 6.9-rc+HEAD

Help text

Use this option to provide more precise enforcement of the rcutree.rcu_resched_ns module parameter in situations where a single RCU callback might run for hundreds of microseconds, thus defeating the 32-callback batching used to amortize the cost of the fine-grained but expensive local_clock() function.

This option rounds rcutree.rcu_resched_ns up to the next jiffy, and overrides the 32-callback batching if this limit is exceeded.

Say Y here if you need tighter callback-limit enforcement. Say N here if you are unsure.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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