[tip:core/urgent] rcu: Kconfig help needs to say that TREE_PREEMPT_RCU scales down
From: tip-bot for Paul E. McKenney
Date: Tue Sep 15 2009 - 03:18:24 EST
Commit-ID: da054e04e4d7c8d340ddc8dc45d4f7cad7672b96
Gitweb: http://git.kernel.org/tip/da054e04e4d7c8d340ddc8dc45d4f7cad7672b96
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Sun, 13 Sep 2009 09:15:08 -0700
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Tue, 15 Sep 2009 08:43:58 +0200
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 <Valdis.Kletnieks@xxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: laijs@xxxxxxxxxxxxxx
Cc: dipankar@xxxxxxxxxx
Cc: akpm@xxxxxxxxxxxxxxxxxxxx
Cc: mathieu.desnoyers@xxxxxxxxxx
Cc: josh@xxxxxxxxxxxxxxxx
Cc: dvhltc@xxxxxxxxxx
Cc: niv@xxxxxxxxxx
Cc: peterz@xxxxxxxxxxxxx
Cc: rostedt@xxxxxxxxxxx
LKML-Reference: <12528585112362-git-send-email->
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
init/Kconfig | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
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
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