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Date:	Tue, 6 Oct 2015 12:33:11 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Josh Triplett <josh@...htriplett.org>,
	linux-kernel@...r.kernel.org, mingo@...nel.org,
	jiangshanlai@...il.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
	dhowells@...hat.com, edumazet@...gle.com, dvhart@...ux.intel.com,
	fweisbec@...il.com, bobby.prani@...il.com
Subject: Re: [PATCH tip/core/rcu 0/13] percpu-rwsem patches for 4.4

On Tue, Oct 06, 2015 at 08:50:56PM +0200, Oleg Nesterov wrote:
> On 10/06, Josh Triplett wrote:
> >
> > For all 13:
> > Reviewed-by: Josh Triplett <josh@...htriplett.org>
> 
> Thanks!
> 
> > Regarding the rcu_sync infrastructure: odd that an atomic read
> > on the reader proves ligher weight than
> > rcu_read_lock()/rcu_read_unlock().
> 
> Cough... Could you spell? ;) I am just curious and I can't understand
> what do you mean.

I would guess that Josh is thinking of CONFIG_PREEMPT=n and that you
worked with CONFIG_PREEMPT=y.  But it would be good to get this fully
understood.

							Thanx, Paul

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