From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754568Ab1LCSfB (ORCPT ); Sat, 3 Dec 2011 13:35:01 -0500 Received: from e2.ny.us.ibm.com ([32.97.182.142]:59806 "EHLO e2.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753834Ab1LCSey (ORCPT ); Sat, 3 Dec 2011 13:34:54 -0500 Date: Sat, 3 Dec 2011 10:34:17 -0800 From: "Paul E. McKenney" To: linux-kernel@vger.kernel.org Cc: mingo@elte.hu, laijs@cn.fujitsu.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca, josh@joshtriplett.org, niv@us.ibm.com, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, Valdis.Kletnieks@vt.edu, dhowells@redhat.com, eric.dumazet@gmail.com, darren@dvhart.com, patches@linaro.org Subject: [PATCH tip/core/rcu 0/7] Preview of fourth set of RCU changes for 3.3 Message-ID: <20111203183417.GA18914@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.20 (2009-06-14) x-cbid: 11120318-5112-0000-0000-000002B3E10E Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello! This patchset adds to the earlier sets: https://lkml.org/lkml/2011/11/2/363 https://lkml.org/lkml/2011/11/15/302 https://lkml.org/lkml/2011/11/28/588 This fourth set adds more infrastructure for Frederic's user-mode nohz work, additional improvements to RCU_FAST_NO_HZ, and a few bug fixes. The patches are as follows: 1,2. More support for user-mode nohz (courtesy of Frederic Weisbecker). 3. Ignore RCU callback batch limits if the CPU is otherwise idle. This allows a CPU to more quickly clear a backlog of callbacks, and thus more quickly enter dyntick-idle mode. 4. Adaptive dyntick-entry approach that more efficiently handles the various possible grace-period begin/end scenarios. 5. Remove a redundant variable declaration. 6. Allow rcutorture to avoid attempting to offline unhotpluggable CPUs. 7. Fix RCU-lockdep splats involving RCU read-side critical sections that partially overlap irq-disable code sections (courtesy of Yong Zhang). For a testing-only version of this patchset from git, please see the following subject-to-rebase branch, based on 3.2-rc3: git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/dev Thanx, Paul ------------------------------------------------------------------------ b/drivers/base/cpu.c | 12 ++++++++ b/include/linux/cpu.h | 1 b/kernel/rcutorture.c | 4 +- b/kernel/rcutree.c | 18 +++++-------- b/kernel/rcutree.h | 1 b/kernel/rcutree_plugin.h | 14 ++++++++++ kernel/rcutree.c | 12 ++++---- kernel/rcutree_plugin.h | 62 ++++++++++++++++++++++++++++++++++++---------- 8 files changed, 92 insertions(+), 32 deletions(-)