linux-kernel - Re: cpu stopper threads and load balancing leads to deadlock

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Message-Id: <20180503182425.GM26088@linux.vnet.ibm.com>
Date:   Thu, 3 May 2018 11:24:25 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Mike Galbraith <efault@....de>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        Michal Hocko <mhocko@...e.com>
Subject: Re: cpu stopper threads and load balancing leads to deadlock

On Thu, May 03, 2018 at 07:54:56PM +0200, Peter Zijlstra wrote:
> On Thu, May 03, 2018 at 10:18:50AM -0700, Paul E. McKenney wrote:
> > > +	if (per_cpu(rcu_cpu_started, cpu))
> > 
> > I would log a non-splat dmesg the first time this happened, just for my
> > future sanity, but otherwise looks fine.  I am a bit concerned about
> > calls to rcu_cpu_starting() getting sprinkled all through the code.
> > Or am I being excessively paranoid?
> 
> Don't think so, but lets first see if this at all works. If not we'll
> need to figure out something else anyway.

Works for me!

							Thanx, Paul