From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753506Ab2DWQQw (ORCPT ); Mon, 23 Apr 2012 12:16:52 -0400 Received: from e33.co.us.ibm.com ([32.97.110.151]:47501 "EHLO e33.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751582Ab2DWQQv (ORCPT ); Mon, 23 Apr 2012 12:16:51 -0400 Date: Mon, 23 Apr 2012 09:15:39 -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@efficios.com, 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 tip/core/rcu 0/4] Updates to RCU_FAST_NO_HZ Message-ID: <20120423161539.GA6467@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: 12042316-2398-0000-0000-0000060943C2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello! This series covers enhancements to RCU_FAST_NO_HZ intended for v3.4-rc2. The individual commits are as follows: 1. Add tracing to rcu_cleanup_after_idle(). 2. Switch from hrtimer to normal timers to reduce overhead. 3. Upgrade RCU_FAST_NO_HZ state machine to better account for brief pauses out of idle, which can happen due to power-management actions, Steven Rostedt's new RCU-idle-capable tracing macros, or my RCU_NONIDLE() macro. 4. Use add_timer_on() to avoid timer migration. Thanx, Paul b/include/trace/events/rcu.h | 1 b/kernel/rcutree.c | 2 b/kernel/rcutree.h | 1 b/kernel/rcutree_plugin.h | 1 kernel/rcutree_plugin.h | 112 ++++++++++++++++++++++++++++--------------- 5 files changed, 80 insertions(+), 37 deletions(-)