From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756796Ab2BATnk (ORCPT ); Wed, 1 Feb 2012 14:43:40 -0500 Received: from e7.ny.us.ibm.com ([32.97.182.137]:54829 "EHLO e7.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756789Ab2BATni (ORCPT ); Wed, 1 Feb 2012 14:43:38 -0500 Date: Wed, 1 Feb 2012 11:41:31 -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, fweisbec@gmail.com, patches@linaro.org Subject: [PATCH RFC 0/41] RCU commits for 3.4 Message-ID: <20120201194131.GA10028@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/1.5.21 (2010-09-15) X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12020119-5806-0000-0000-000011F30073 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello! This patchset makes RCU more aggressive about entering dyntick-idle mode in order to improve energy efficiency, converts a few more call_rcu()s to kfree_rcu(), applies a number of rcutree fixes and cleanups to rcutiny, removes CONFIG_SMP #ifdef from treercu, allows RCU CPU stall times to be set via sysfs, add CPU-stall capability to rcutorture, adds more RCU-abuse diagnostics, updates documentation, and yet more fixes from the still-ongoing top-to-bottom inspection of RCU with a special focus on the CPU-hotplug code path. The patches are as follows: 1,26,41,40. Documentation upgrades. 2. Improve synchronize_rcu() diagnostics, courtesy of Frederic Weisbecker. 3. Add lockdep-RCU checks for simple self deadlock, such as calling synchronize_rcu() while in an RCU read-side critical section. 4. Add a diagnostic for misaligned rcu_head structures. This is preparation for a call_rcu_lazy() for added energy efficiency. 5,14,36. Upgrades to CONFIG_RCU_FAST_NO_HZ. 6. Move CONFIG_RCU_TRACE to lib/Kconfig.debug: not for production use. 7-11. Convert several call_rcu() primitives to kfree_rcu(). 12,13,15,16,37-39. Fixes to and streamlining of CPU-hotplug handling based on review. 17. Remove dubious single-rcu_node optimization from rcu_start_gp(). 18-22. Apply prior rcutree fixes to rcutiny. 23. Catch rcu_preempt_needs_cpu()'s name up with 2011. 24. Check for idle-loop entry while in an RCU read-side critical section. 25. Check for sleeping in TREE_RCU read-side critical sections. 27,35. Remove "#ifdef CONFIG_SMP" from treercu, move code accordingly. 28. Allow RCU CPU stall times to be adjusted at runtime via sysfs. 29. Print scheduling-clock timer information on RCU CPU stall warning messages if requested by CONFIG_RCU_CPU_STALL_INFO config parameter. 30. Allow rcutorture to be told to hold off CPU-hotplug operations during early boot. 31. Allow rcutorture to generate CPU stalls in order to test RCU CPU stall warning facility. 33. Silence module-parameter warnings by converting a couple of rcutorture's module parameters to bool. 34. Check for illegal use of RCU from offlined CPUs. 41. Fix misplaced NULL-pointer check in rcutorture. For a testing-only version of this patchset from git, please see the following subject-to-rebase branch: git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/dev Thanx, Paul ------------------------------------------------------------------------ Documentation/RCU/torture.txt | 18 b/Documentation/RCU/RTFP.txt | 1910 ++++++++++++++++++++++++++++++++++--- b/Documentation/RCU/checklist.txt | 14 b/Documentation/RCU/stallwarn.txt | 85 + b/Documentation/RCU/torture.txt | 15 b/Documentation/RCU/trace.txt | 36 b/arch/s390/kernel/irq.c | 9 b/drivers/target/tcm_fc/tfc_sess.c | 12 b/include/linux/rcupdate.h | 2 b/include/linux/rcutiny.h | 6 b/include/linux/rcutree.h | 1 b/include/linux/sched.h | 3 b/include/linux/srcu.h | 11 b/include/trace/events/rcu.h | 63 - b/init/Kconfig | 9 b/kernel/lockdep.c | 8 b/kernel/rcu.h | 4 b/kernel/rcupdate.c | 5 b/kernel/rcutiny.c | 3 b/kernel/rcutiny_plugin.h | 4 b/kernel/rcutorture.c | 4 b/kernel/rcutree.c | 6 b/kernel/rcutree.h | 3 b/kernel/rcutree_plugin.h | 3 b/kernel/rcutree_trace.c | 8 b/kernel/srcu.c | 4 b/lib/Kconfig.debug | 9 b/net/ipv4/cipso_ipv4.c | 11 b/net/ipv4/ip_sockglue.c | 7 b/net/mac80211/mesh_pathtbl.c | 8 include/linux/rcupdate.h | 40 include/linux/rcutiny.h | 4 include/linux/rcutree.h | 18 kernel/rcutiny.c | 4 kernel/rcutiny_plugin.h | 72 + kernel/rcutorture.c | 83 + kernel/rcutree.c | 641 ++++++++---- kernel/rcutree.h | 24 kernel/rcutree_plugin.h | 443 +++++--- kernel/rcutree_trace.c | 6 kernel/srcu.c | 27 lib/Kconfig.debug | 14 42 files changed, 2954 insertions(+), 703 deletions(-)