Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758161AbZIOHSQ (ORCPT ); Tue, 15 Sep 2009 03:18:16 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758135AbZIOHSL (ORCPT ); Tue, 15 Sep 2009 03:18:11 -0400 Received: from hera.kernel.org ([140.211.167.34]:49497 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758116AbZIOHSK (ORCPT ); Tue, 15 Sep 2009 03:18:10 -0400 Date: Tue, 15 Sep 2009 07:17:31 GMT From: "tip-bot for Paul E. McKenney" Cc: linux-kernel@vger.kernel.org, Valdis.Kletnieks@vt.edu, paulmck@linux.vnet.ibm.com, hpa@zytor.com, mingo@redhat.com, tglx@linutronix.de, mingo@elte.hu Reply-To: mingo@redhat.com, hpa@zytor.com, paulmck@linux.vnet.ibm.com, Valdis.Kletnieks@vt.edu, linux-kernel@vger.kernel.org, tglx@linutronix.de, mingo@elte.hu In-Reply-To: <12528585112362-git-send-email-> References: <12528585112362-git-send-email-> To: linux-tip-commits@vger.kernel.org Subject: [tip:core/urgent] rcu: Kconfig help needs to say that TREE_PREEMPT_RCU scales down Message-ID: Git-Commit-ID: da054e04e4d7c8d340ddc8dc45d4f7cad7672b96 X-Mailer: tip-git-log-daemon MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.0 (hera.kernel.org [127.0.0.1]); Tue, 15 Sep 2009 07:17:32 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1944 Lines: 58 Commit-ID: da054e04e4d7c8d340ddc8dc45d4f7cad7672b96 Gitweb: http://git.kernel.org/tip/da054e04e4d7c8d340ddc8dc45d4f7cad7672b96 Author: Paul E. McKenney AuthorDate: Sun, 13 Sep 2009 09:15:08 -0700 Committer: Ingo Molnar 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 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 --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/