From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754187AbZJNR2w (ORCPT ); Wed, 14 Oct 2009 13:28:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753809AbZJNR2v (ORCPT ); Wed, 14 Oct 2009 13:28:51 -0400 Received: from e4.ny.us.ibm.com ([32.97.182.144]:43673 "EHLO e4.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751763AbZJNR2u (ORCPT ); Wed, 14 Oct 2009 13:28:50 -0400 Date: Wed, 14 Oct 2009 10:15:17 -0700 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, dvhltc@us.ibm.com, niv@us.ibm.com, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, Valdis.Kletnieks@vt.edu, dhowells@redhat.com, npiggin@suse.de, jens.axboe@oracle.com Subject: [PATCH tip/core/rcu 0/6] rcu: fix synchronize_rcu_expedited(), update docs, improve perf Message-ID: <20091014171517.GA13635@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/1.5.15+20070412 (2007-04-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patchset contains a bug fix, a performance improvement, and documentation updates: o Update Documentation/RCU/trace.txt to reflect recent changes (including the removal of rcupreempt.c). o Fix to the severe performance problem with excessive IPIs and lock contention in presence of very large (but legal) numbers of RCU callbacks (reported by Nick Piggin). o Stopgap fix for a bug in TREE_PREEMPT_RCU's implementation of synchronize_rcu_expedited(). This fix is correct, but no faster than synchronize_rcu(). o Add exports for the updated synchronize_rcu_expedited() implementation, which moved from a static inline in include/linux/rcupdate.h to a separately compiled function in kernel/rcutree_plugin.h. o Add the new rnp->blocked_tasks field to the rcuhier trace file in debugfs. o Update the Documentation/RCU/trace.txt documentation to include the rnp->blocked_tasks tracing. I believe that this is 2.6.32 material. Documentation/RCU/trace.txt | 22 ++- b/Documentation/RCU/trace.txt | 232 +++++------------------------------------- b/include/linux/rcutree.h | 6 - b/kernel/rcutree.c | 29 ++++- b/kernel/rcutree.h | 5 b/kernel/rcutree_plugin.h | 20 +++ b/kernel/rcutree_trace.c | 8 - kernel/rcutree_plugin.h | 3 8 files changed, 103 insertions(+), 222 deletions(-)