From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758631Ab3IYBmX (ORCPT ); Tue, 24 Sep 2013 21:42:23 -0400 Received: from e31.co.us.ibm.com ([32.97.110.149]:56600 "EHLO e31.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755527Ab3IYBmT (ORCPT ); Tue, 24 Sep 2013 21:42:19 -0400 Date: Tue, 24 Sep 2013 18:42:10 -0700 From: "Paul E. McKenney" To: linux-kernel@vger.kernel.org Cc: mingo@kernel.org, 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, dhowells@redhat.com, edumazet@google.com, darren@dvhart.com, fweisbec@gmail.com, sbw@mit.edu Subject: [PATCH tip/core/rcu 0/10] Grace-period-related changes for 3.13 Message-ID: <20130925014210.GA31690@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-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13092501-8236-0000-0000-000002123FD3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello! This series contains updates to RCU's grace-period processsing, mostly to improve debuggability of RCU itself. 1. Add consistency checks to the grace-period initialization logic. 2. Prevent spurious-wakeup DoS attack on rcu_gp_kthread. 3. Flag lockless accesses to ->gp_flags with ACCESS_ONCE(). 4-6. Add event tracing to various aspects of RCU grace period processing. 7. Distinguish between NOCB and non-NOCB rcu_callback trace events. 8. Add event tracing to track rcu_nocb_kthread() sleeping and awakening. 9. Avoid sparse warnings in rcu_nocb_wake trace event. 10. Make RCU use resched_cpu() instead of the current set_need_resched(), courtesy of Peter Zijlstra. Thanx, Paul b/include/trace/events/rcu.h | 80 +++++++++++++++++++++++++++++++++++-------- b/kernel/rcutiny.c | 2 - b/kernel/rcutree.c | 71 ++++++++++++++++++++++++++++++++------ b/kernel/rcutree_plugin.h | 35 ++++++++++++++++-- b/kernel/sched/core.c | 10 +---- 5 files changed, 160 insertions(+), 38 deletions(-)