linux-kernel - Re: [PATCH -tip/core/rcu 1/6] Cleanups and fixes for RCU in face of heavy CPU-hotplug stress

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Message-ID: <20090817192036.GJ6760@linux.vnet.ibm.com>
Date:	Mon, 17 Aug 2009 12:20:36 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Josh Triplett <josht@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, dvhltc@...ibm.com, niv@...ibm.com,
	tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
	hugh.dickins@...cali.co.uk, benh@...nel.crashing.org
Subject: Re: [PATCH -tip/core/rcu 1/6] Cleanups and fixes for RCU in face
	of heavy CPU-hotplug stress

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
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