rcu: Update RCU_FAST_NO_HZ help text
The RCU_FAST_NO_HZ help text included a warning about overhead on large systems, but that issue has since been resolved. The main remaining issue with RCU_FAST_NO_HZ is increased real-time latency. This commit therefore updates the help text accordingly. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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init/Kconfig
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init/Kconfig
@ -582,14 +582,13 @@ config RCU_FAST_NO_HZ
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depends on NO_HZ && SMP
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depends on NO_HZ && SMP
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default n
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default n
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help
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help
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This option causes RCU to attempt to accelerate grace periods
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This option causes RCU to attempt to accelerate grace periods in
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in order to allow CPUs to enter dynticks-idle state more
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order to allow CPUs to enter dynticks-idle state more quickly.
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quickly. On the other hand, this option increases the overhead
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On the other hand, this option increases the overhead of the
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of the dynticks-idle checking, particularly on systems with
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dynticks-idle checking, thus degrading scheduling latency.
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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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Say Y if energy efficiency is critically important, and you don't
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if you have relatively few CPUs.
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care about real-time response.
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Say N if you are unsure.
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Say N if you are unsure.
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