From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
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, tglx@linutronix.de, peterz@infradead.org,
rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com,
dvhart@linux.intel.com, fweisbec@gmail.com, oleg@redhat.com,
bobby.prani@gmail.com
Subject: [PATCH tip/core/rcu 0/14] Preemptible-RCU updates for 3.20
Date: Wed, 7 Jan 2015 09:32:15 -0800 [thread overview]
Message-ID: <20150107173215.GA897@linux.vnet.ibm.com> (raw)
Hello!
This series fixes some problems in preemptible RCU.
1. Protect rcu_boost() lockless accesses with ACCESS_ONCE().
2-11. Fix a low-probability long-standing bug in preemptible RCU that
could occur in systems with more than 16 CPUs, but only if a full
bank of 16 CPUs (as in 0-15, 16-31, 32-47, ...) was taken offline.
See http://paulmck.livejournal.com/37782.html for more details.
12. Revert old commit that worked around an rt_mutex bug. This old
commit could cause priority inversion, and the rt_mutex bug has
long since been fixed. Courtesy of Lai Jiangshan.
13. Simplify grace-period code, enabled by 2-11 above.
14. Remove redundant RCU callback list initialization.
Thanx, Paul
------------------------------------------------------------------------
b/kernel/rcu/tree.c | 115 +++++++++++++-------------
b/kernel/rcu/tree.h | 24 -----
b/kernel/rcu/tree_plugin.h | 196 ++++++++++-----------------------------------
3 files changed, 102 insertions(+), 233 deletions(-)
next reply other threads:[~2015-01-07 17:32 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-07 17:32 Paul E. McKenney [this message]
2015-01-07 17:32 ` [PATCH tip/core/rcu 01/14] rcu: Protect rcu_boost() lockless accesses with ACCESS_ONCE() Paul E. McKenney
2015-01-07 17:32 ` [PATCH tip/core/rcu 02/14] rcu: Rename "empty" to "empty_norm" in preparation for boost rework Paul E. McKenney
2015-01-07 17:32 ` [PATCH tip/core/rcu 03/14] rcu: Abstract rcu_cleanup_dead_rnp() from rcu_cleanup_dead_cpu() Paul E. McKenney
2015-01-07 17:32 ` [PATCH tip/core/rcu 04/14] rcu: Make rcu_read_unlock_special() propagate ->qsmaskinit bit clearing Paul E. McKenney
2015-01-07 17:32 ` [PATCH tip/core/rcu 05/14] rcu: Don't migrate blocked tasks even if all corresponding CPUs offline Paul E. McKenney
2015-01-07 17:32 ` [PATCH tip/core/rcu 06/14] rcu: Shorten irq-disable region in rcu_cleanup_dead_cpu() Paul E. McKenney
2015-01-07 17:32 ` [PATCH tip/core/rcu 07/14] rcu: Make use of rcu_preempt_has_tasks() Paul E. McKenney
2015-01-07 17:32 ` [PATCH tip/core/rcu 08/14] rcu: Don't spawn rcub kthreads on root rcu_node structure Paul E. McKenney
2015-01-07 17:32 ` [PATCH tip/core/rcu 09/14] rcu: Don't initiate RCU priority boosting on root rcu_node Paul E. McKenney
2015-01-07 17:32 ` [PATCH tip/core/rcu 10/14] rcu: Don't bother affinitying rcub kthreads away from offline CPUs Paul E. McKenney
2015-01-07 17:32 ` [PATCH tip/core/rcu 11/14] rcu: Note quiescent state when CPU goes offline Paul E. McKenney
2015-01-07 17:32 ` [PATCH tip/core/rcu 12/14] rcu: Revert "Allow post-unlock reference for rt_mutex" to avoid priority-inversion Paul E. McKenney
2015-01-07 17:32 ` [PATCH tip/core/rcu 13/14] rcu: Don't scan root rcu_node structure for stalled tasks Paul E. McKenney
2015-01-07 17:32 ` [PATCH tip/core/rcu 14/14] rcu: Remove redundant callback-list initialization Paul E. McKenney
2015-01-08 9:41 ` [PATCH tip/core/rcu 01/14] rcu: Protect rcu_boost() lockless accesses with ACCESS_ONCE() Peter Zijlstra
2015-01-08 15:22 ` Paul E. McKenney
2015-01-09 6:41 ` Davidlohr Bueso
2015-01-09 13:49 ` Paul E. McKenney
2015-01-09 13:56 ` Peter Zijlstra
2015-01-09 14:07 ` Paul E. McKenney
2015-01-09 16:53 ` Mathieu Desnoyers
2015-01-09 21:58 ` Christian Borntraeger
2015-01-10 0:27 ` Davidlohr Bueso
2015-01-12 8:59 ` Peter Zijlstra
2015-01-12 22:12 ` Paul E. McKenney
2015-01-13 8:18 ` Christian Borntraeger
2015-01-13 9:29 ` Peter Zijlstra
2015-01-13 17:47 ` Paul E. McKenney
2015-01-13 19:12 ` Davidlohr Bueso
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