linux-kernel - [tip:core/urgent] rcu: Kconfig help needs to say that TREE_PREEMPT

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Message-ID: <tip-da054e04e4d7c8d340ddc8dc45d4f7cad7672b96@git.kernel.org>
Date:	Tue, 15 Sep 2009 07:17:31 GMT
From:	"tip-bot for Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Valdis.Kletnieks@...edu,
	paulmck@...ux.vnet.ibm.com, hpa@...or.com, mingo@...hat.com,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:core/urgent] rcu: Kconfig help needs to say that TREE_PREEMPT_RCU scales down

Commit-ID:  da054e04e4d7c8d340ddc8dc45d4f7cad7672b96
Gitweb:     http://git.kernel.org/tip/da054e04e4d7c8d340ddc8dc45d4f7cad7672b96
Author:     Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
AuthorDate: Sun, 13 Sep 2009 09:15:08 -0700
Committer:  Ingo Molnar <mingo@...e.hu>
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@...edu>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: laijs@...fujitsu.com
Cc: dipankar@...ibm.com
Cc: akpm@...ux-foundation.org
Cc: mathieu.desnoyers@...ymtl.ca
Cc: josh@...htriplett.org
Cc: dvhltc@...ibm.com
Cc: niv@...ibm.com
Cc: peterz@...radead.org
Cc: rostedt@...dmis.org
LKML-Reference: <12528585112362-git-send-email->
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 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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