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-rw-r--r--init/Kconfig15
1 files changed, 7 insertions, 8 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 6fdd6e339326..b63e7982c1c6 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -582,14 +582,13 @@ config RCU_FAST_NO_HZ
depends on NO_HZ && SMP
default n
help
- This option causes RCU to attempt to accelerate grace periods
- in order to allow CPUs to enter dynticks-idle state more
- quickly. On the other hand, this option increases the overhead
- of the dynticks-idle checking, particularly on systems with
- large numbers of CPUs.
-
- Say Y if energy efficiency is critically important, particularly
- if you have relatively few CPUs.
+ This option causes RCU to attempt to accelerate grace periods in
+ order to allow CPUs to enter dynticks-idle state more quickly.
+ On the other hand, this option increases the overhead of the
+ dynticks-idle checking, thus degrading scheduling latency.
+
+ Say Y if energy efficiency is critically important, and you don't
+ care about real-time response.
Say N if you are unsure.