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

Paul E. McKenney
2009-08-17T19:20:39Z

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