rcu: Permit RCU_FAST_NO_HZ to be used by TREE_PREEMPT_RCU
The new implementation of RCU_FAST_NO_HZ is compatible with preemptible RCU, so this commit removes the Kconfig restriction that previously prohibited this. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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init/Kconfig
10
init/Kconfig
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@ -469,14 +469,14 @@ config RCU_FANOUT_EXACT
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config RCU_FAST_NO_HZ
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bool "Accelerate last non-dyntick-idle CPU's grace periods"
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depends on TREE_RCU && NO_HZ && SMP
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depends on NO_HZ && SMP
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default n
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help
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This option causes RCU to attempt to accelerate grace periods
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in order to allow the final CPU to enter dynticks-idle state
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more quickly. On the other hand, this option increases the
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overhead of the dynticks-idle checking, particularly on systems
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with large numbers of CPUs.
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in order to allow CPUs to enter dynticks-idle state more
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quickly. On the other hand, this option increases the overhead
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of the dynticks-idle checking, particularly on systems with
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large numbers of CPUs.
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Say Y if energy efficiency is critically important, particularly
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if you have relatively few CPUs.
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