From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760317AbZJOJXP (ORCPT ); Thu, 15 Oct 2009 05:23:15 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754821AbZJOJXO (ORCPT ); Thu, 15 Oct 2009 05:23:14 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:56872 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754608AbZJOJXN (ORCPT ); Thu, 15 Oct 2009 05:23:13 -0400 Date: Thu, 15 Oct 2009 11:21:55 +0200 From: Ingo Molnar To: "Paul E. McKenney" Cc: linux-kernel@vger.kernel.org, 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: Re: [PATCH tip/core/rcu 0/6] rcu: fix synchronize_rcu_expedited(), update docs, improve perf Message-ID: <20091015092155.GD10546@elte.hu> References: <20091014171517.GA13635@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20091014171517.GA13635@linux.vnet.ibm.com> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-SpamScore: 0.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=0.0 required=5.9 tests=none autolearn=no SpamAssassin version=3.2.5 _SUMMARY_ Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Paul E. McKenney wrote: > 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). i've applied this to the .33 queue. > > 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). i've applied this to the .32 queue. > 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. i've merged these two into the same commit and applied it to the .32 queue. > 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've applied these to the .33 queue as well. (both tracing and documentation is not urgent material.) I also did minor edits to the changelogs. Thanks Paul! Ingo