From: Paul E. McKenney Date: Sun, 13 Sep 2009 16:15:08 +0000 (-0700) Subject: rcu: Kconfig help needs to say that TREE_PREEMPT_RCU scales down X-Git-Tag: upstream/snapshot3+hdmi~17580^2~7 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=bbe3eae8bb039b5ffd64a6e3d1a0deaa1f3cbae9;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git rcu: Kconfig help needs to say that TREE_PREEMPT_RCU scales down To quote Valdis: This leaves somebody who has a laptop wondering which choice is best for a system with only one or two cores that has CONFIG_PREEMPT defined. One choice says it scales down nicely, the other explicitly has a 'depends on PREEMPT' attached to it... So add "scales down nicely" to TREE_PREEMPT_RCU to match that of TREE_RCU. Suggested-by: Valdis Kletnieks Signed-off-by: Paul E. McKenney Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: akpm@linux-foundation.org Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org LKML-Reference: <12528585112362-git-send-email-> Signed-off-by: Ingo Molnar --- diff --git a/init/Kconfig b/init/Kconfig index 8e8b76d..4c2c936 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -331,7 +331,8 @@ config TREE_PREEMPT_RCU This option selects the RCU implementation that is designed for very large SMP systems with hundreds or thousands of CPUs, but for which real-time response - is also required. + is also required. It also scales down nicely to + smaller systems. endchoice