From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Josh Triplett <josht@linux.vnet.ibm.com>
Cc: linux-kernel@vger.kernel.org, mingo@elte.hu,
laijs@cn.fujitsu.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca,
dvhltc@us.ibm.com, niv@us.ibm.com, tglx@linutronix.de,
peterz@infradead.org, rostedt@goodmis.org,
hugh.dickins@tiscali.co.uk, benh@kernel.crashing.org
Subject: Re: [PATCH -tip/core/rcu 1/6] Cleanups and fixes for RCU in face of heavy CPU-hotplug stress
Date: Mon, 17 Aug 2009 12:20:36 -0700 [thread overview]
Message-ID: <20090817192036.GJ6760@linux.vnet.ibm.com> (raw)
In-Reply-To: <1250533487.2709.14.camel@josh-work.beaverton.ibm.com>
On Mon, Aug 17, 2009 at 11:24:47AM -0700, Josh Triplett wrote:
> On Sat, 2009-08-15 at 09:51 -0700, Paul E. McKenney wrote:
> > These pass tests combining rcutorture and continuous CPU-hotplug
> > operations, in other words, no sleeping between successive CPU-hotplug
> > operations. This set does not fix the bug involving deadlocks through
> > rcutorture, kthread_stop(), and migration threads. However, this bug
> > does not affect production systems, so should not stand in the way of
> > applying these patches.
>
> Commit 63706172f332fd3f6e7458ebfb35fa6de9c21dc5, "kthreads: rework
> kthread_stop()", looks like it fixes kthread_stop to work concurrently.
> That may fix the issue you observed.
Very cool!!! Given that Oleg is the author, it probably also works. :-)
Thanx, Paul
next prev parent reply other threads:[~2009-08-17 19:20 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-15 16:51 [PATCH -tip/core/rcu 1/6] Cleanups and fixes for RCU in face of heavy CPU-hotplug stress Paul E. McKenney
2009-08-15 16:53 ` [PATCH -tip/core/rcu 1/6] Split hierarchical RCU initialization into boot-time and CPU-online pieces Paul E. McKenney
2009-08-15 17:07 ` [tip:core/rcu] rcu: " tip-bot for Paul E. McKenney
2009-08-15 16:53 ` [PATCH -tip/core/rcu 2/6] Introduce cpu_notifier() to handle !HOTPLUG_CPU case Paul E. McKenney
2009-08-15 17:07 ` [tip:core/rcu] cpu hotplug: " tip-bot for Paul E. McKenney
2009-08-17 17:21 ` [PATCH -tip/core/rcu 2/6] " Josh Triplett
2009-08-17 18:28 ` Paul E. McKenney
2009-08-15 16:53 ` [PATCH -tip/core/rcu 3/6] Simplify RCU CPU-hotplug notification Paul E. McKenney
2009-08-15 17:07 ` [tip:core/rcu] rcu: " tip-bot for Paul E. McKenney
2009-08-20 4:02 ` [PATCH -tip/core/rcu 3/6] " Lai Jiangshan
2009-08-20 4:21 ` Paul E. McKenney
2009-08-15 16:53 ` [PATCH -tip/core/rcu 4/6] Make preemptable RCU scan all CPUs when summing RCU counters Paul E. McKenney
2009-08-15 17:07 ` [tip:core/rcu] rcu: " tip-bot for Paul E. McKenney
2009-08-15 16:53 ` [PATCH -tip/core/rcu 5/6] Make rcupreempt_trace.c look at offline CPUs Paul E. McKenney
2009-08-15 17:07 ` [tip:core/rcu] rcu: " tip-bot for Paul E. McKenney
2009-08-15 16:53 ` [PATCH -tip/core/rcu 6/6] Fix typo in rcu_irq_exit() comment header Paul E. McKenney
2009-08-15 17:00 ` Ingo Molnar
2009-08-15 17:10 ` Paul E. McKenney
2009-08-15 17:11 ` Ingo Molnar
2009-08-15 17:08 ` [tip:core/rcu] rcu: " tip-bot for Josh Triplett
2009-08-17 18:24 ` [PATCH -tip/core/rcu 1/6] Cleanups and fixes for RCU in face of heavy CPU-hotplug stress Josh Triplett
2009-08-17 19:20 ` Paul E. McKenney [this message]
2009-08-18 15:26 ` Ingo Molnar
2009-08-18 20:07 ` Paul E. McKenney
2009-08-19 6:06 ` Paul E. McKenney
2009-08-19 11:59 ` Ingo Molnar
2009-08-19 12:09 ` [tip:core/rcu] rcu: Delay rcu_barrier() wait until beginning of next CPU-hotunplug operation tip-bot for Paul E. McKenney
2009-08-19 15:24 ` [PATCH -tip/core/rcu 1/6] Cleanups and fixes for RCU in face of heavy CPU-hotplug stress Mathieu Desnoyers
2009-08-19 16:38 ` Paul E. McKenney
2009-08-19 18:10 ` Mathieu Desnoyers
2009-08-19 18:31 ` Paul E. McKenney
2009-08-20 14:03 ` Mathieu Desnoyers
2009-08-21 14:17 ` Ingo Molnar
2009-08-21 14:29 ` Steven Rostedt
2009-08-21 14:44 ` Ingo Molnar
2009-08-21 15:00 ` Mathieu Desnoyers
2009-08-21 15:37 ` Paul E. McKenney
2009-08-21 14:58 ` Mathieu Desnoyers
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