Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit b807fbff authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Paul E. McKenney
Browse files

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: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: default avatarJosh Triplett <josh@joshtriplett.org>
parent 11dbaa8c

init/Kconfig

+5 −5
Original line number Diff line number Diff line
@@ -469,14 +469,14 @@ config RCU_FANOUT_EXACT 


config RCU_FAST_NO_HZ

	bool "Accelerate last non-dyntick-idle CPU's grace periods"

	depends on TREE_RCU && NO_HZ && SMP

	depends on NO_HZ && SMP

	default n

	help

	  This option causes RCU to attempt to accelerate grace periods

	  in order to allow the final CPU 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.

	  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.