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Commit ba49df47 authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Paul E. McKenney
Browse files

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: default avatarPaul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 4d9a5d43

init/Kconfig

+7 −8
Original line number Diff line number Diff line
@@ -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.