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CONFIG_RCU_FANOUT_EXACT: Disable tree-based hierarchical RCU auto-balancing

General informations

The Linux kernel configuration item CONFIG_RCU_FANOUT_EXACT:

• prompt: Disable tree-based hierarchical RCU auto-balancing
• type: bool
• depends on: CONFIG_TREE_RCU || CONFIG_TREE_PREEMPT_RCU
• defined in init/Kconfig
• found in Linux kernels: 2.6.29–2.6.39, 3.0–3.9, 3.10-rc+HEAD

Help text

This option forces use of the exact RCU_FANOUT value specified, regardless of imbalances in the hierarchy. This is useful for testing RCU itself, and might one day be useful on systems with strong NUMA behavior.

Without RCU_FANOUT_EXACT, the code will balance the hierarchy.

Say N if unsure.

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